JP5108609B2 - Water heater - Google Patents

Description

  The present invention relates to a water heater having a hot water storage tank for storing hot water.

FIG. 7A is an enlarged cross-sectional view of a connecting portion that connects a conventional hot water storage tank 100 and a pipe 101 that takes out hot water Y from the hot water storage tank 100, and FIG. 2 is an enlarged exploded view including a partial cross-section of a connecting portion connecting a conventional hot water storage tank 100 and a pipe 101 for taking out hot water Y from the hot water storage tank 100.
Conventionally, a water heater having a hot water storage tank 100 is a means for connecting a hot water storage tank 100 for storing hot water Y and a pipe 101 for taking out the hot water Y from the hot water storage tank 100 as shown in FIG. 7B, the joint 102 is attached to the hot water storage tank 100 by welding, while the joint 103 is attached to the pipe 101. As shown in FIG.

  The bent portion 101k of the pipe 101 to which the joint 103 is attached is inserted into the hot water storage tank 100 through the joint 102 fixed to the hot water storage tank 100, and then screwed onto the inner peripheral surface of the joint 102 of the hot water storage tank 100. The male screw 103n of the joint 103 attached to the pipe 101 is screwed to the engraved female screw 102n, and the pipe 101 for taking out the hot water Y is connected to the hot water storage tank 100.

  A sealing tape (not shown) is wound around the male screw 103n of the joint 103 attached to the pipe 101 shown in FIG. 7B in advance before assembly, and the joint 102 on the hot water storage tank 100 side is wound around the joint 102. After the joint 103 on the pipe 101 side is screwed, water leakage between the female screw 102n of the joint 102 on the hot water storage tank 100 side and the male screw 103n of the joint 103 on the pipe 101 side is prevented.

  Further, in the case of a water heater using a heat pump as a heating means for boiling the low temperature hot water Y in the hot water storage tank 100, the remaining hot water temperature in the hot water storage tank 100 becomes a temperature distribution that becomes higher as it goes from the bottom to the top. A low temperature hot water Y is formed in the lower part of the hot water storage tank 100, a middle temperature hot water Y is formed in the central part of the hot water storage tank 100, and a high temperature hot water Y is formed in the upper part of the hot water storage tank 100.

In the case of a water heater using a heat pump or a water heater using an electric heater, in order to efficiently boil the hot water in the hot water storage tank 100, the boiling of the remaining hot water Y in the hot water storage tank 100 is reduced and the hot water storage tank 100 is used. It is desirable to boil only the low temperature hot water Y in the tank 100 from the viewpoint of reducing heat loss and efficient heat exchange.
Therefore, in order to reduce the remaining hot water Y in the hot water storage tank 100, there is a tendency to employ a hot water heater that discharges hot water from the center of the hot water storage tank 100 (for example, Patent Document 1).
JP 2007-333338 A

  By the way, the male screw 103n of the joint 103 attached to the pipe 101 is screwed to the female screw 102n threaded on the inner peripheral surface of the joint 102 of the hot water storage tank 100 as described above, so that the hot water storage tank 100 is fitted. When the pipe 101 for taking out the hot water Y is connected, it is necessary to screw the pipe 101 into the hot water storage tank 100, and there is a problem that work efficiency must be reduced.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a water heater with good sealing performance and assemblability.

In order to achieve the above object, the present invention is a water heater and a hot water storage tank for storing heated hot water by the heating means and heating means for heating water or hot water, the hot-water stocking tank A pipe fixing member that is fixed to a pipe mounting hole formed at a central portion in the vertical direction of the hot water storage tank and has a hot water outlet hole for allowing hot water in the hot water storage tank to flow therethrough, and is fitted into the hot water outlet hole of the pipe fixing member. And a hot water pipe having a sealing member that seals and seals the gap between the fitting part and the hot water outlet hole of the pipe fixing member, and the hot water outlet of the pipe fixing member includes a fitting part of the hot water pipe A fitting member that connects the pipe fixing member and the tapping pipe in a state of being fitted in a hole, and a tip end portion of the tapping pipe projects more inside the hot water storage tank than the pipe fixing member, Pa The fitting portion to be fitted to the flop fixing member is provided so as to project radially outward of and the tapping tube at the proximal end than the distal end portion of the tapping tube.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water heater with favorable sealing performance and assemblability is realizable.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
<< First Embodiment >>
FIG. 1 is a configuration diagram illustrating an example of an electric water heater S according to an embodiment of the present invention.

<Overall configuration of electric water heater S>
As shown in FIG. 1, an electric water heater S according to the embodiment includes a pipe 7 that is supplied with water from a water pipe 22 that is a water source, and a heat pump unit 8 that heats low-temperature tap water supplied from the pipe 7. A hot water storage tank 1 for storing hot water heated by the heat pump unit 8, a hot water filling circuit 2Y for supplying the hot water in the hot water storage tank 1 to the bathtub 2 (thick solid line indicated by an arrow in FIG. 1), a water pipe The hot water in the hot water storage tank 1 is heated by exchanging heat with the hot water in the hot water storage tank 1 to generate hot water for hot water supply. A reheating heat exchanger 24 for heat exchange and heating, a reheating circuit 2P for deriving bath water stretched in the bathtub 2, reheating it with the reheating heat exchanger 24, and returning it to the bathtub 2, and in the bathroom Mist (liquid fine A mist pipe 64 for supplying hot water for generation, a mist unit 65 connected to the pipe 64 for generating mist and warming the bathroom with a heater, hot water filling, reheating, hot water supply, etc. An operation unit 60 such as a bath remote controller 45 and a kitchen remote controller 46 operated by a user for performing the operation, and a controller 16 that comprehensively controls the entire electric water heater S in accordance with an operation command from the operation unit 60. ing.

  The mist sauna is a heater that is integrated with or separate from the mist unit 65 to warm the interior of the bathroom to a predetermined temperature, for example, around 40 ° C. Is added with the function of a mist to spray in the bathroom.

<Outline of operation of electric water heater S>
When the electric water heater S heats the tap water supplied from the water pipe 22 to warm water, the tap water from the water pipe 22 passes through the pressure reducing valve 6 from the pipe 7 as shown in FIG. As shown by the broken line of the white arrow, the heat pump unit 8 is introduced into the lower part of the hot water storage tank 1 through the pipe 23 and the tap water introduced into the hot water storage tank 1 is passed through the pipe 32, the three-way valve 33 and the pipe 34. The hot water is heated by the gas cooler of the heat pump unit 8 to make hot water, and this hot water is introduced into the upper part of the hot water storage tank 1 through the pipe 35.

  The hot water stored in the hot water storage tank 1 is supplied to a place of use, for example, a bathtub 2 through various pipes, used for a mist sauna in a bathroom, or used as a washing tap, shower, etc. It is used for hot water supply from the sea, replenishing the warm water in the bathtub 2, etc.

  When hot water is supplied from the mixing tap 19 in the electric water heater S, tap water supplied from the water pipe 22 is heated by the hot water supply heat exchanger 4 through the pipe 7 as hot water, and the pipe 36, accumulator 39, pipe The mixing plug 19 is supplied through 40.

  The hot water filling to the bathtub 2 takes out the hot water in the upper part of the hot water tank 1 from the first outlet 10 at the upper part of the hot water tank 1, as shown by the thick solid line shown by the arrow in FIG. While being led to the second mixing valve 11 through the pipe 41, the intermediate temperature water in the intermediate part of the hot water storage tank 1 is taken out from the second outlet 12 provided in the intermediate part of the hot water storage tank 1 and led to the second mixing valve 11 through the pipe 13. Mix. The mixed warm water is guided to the first mixing valve 14 through the pipe 15, while the tap water in the water pipe 22 is first mixed through the pipe 7 and the pressure reducing valve 6 as indicated by the broken line in FIG. The hot water from the hot water storage tank 1 and the tap water from the water pipe 22 are merged by the first mixing valve 14 and the temperature of the hot water is adjusted according to the degree of mixing with the tap water. Hot water filling.

  To refill the bath water in the bathtub 2, the hot water (hot water) or water in the bathtub 2 is circulated to the reheating heat exchanger 24 disposed in the upper part of the hot water storage tank 1 to reheat the reheating water exchanger. In 24, the hot water in the upper part of the hot water storage tank 1 is indirectly heated and recirculated into the bathtub 2 for reheating.

The mist sauna in the bathroom warms the interior of the bathroom to a predetermined temperature, for example, around 40 ° C., with a heater (not shown) provided in the mist unit 65.
Further, the hot water in the upper part of the hot water storage tank 1 is taken out from the first outlet 10 at the upper part of the hot water storage tank 1 and guided to the second mixing valve 11 through the pipe 41 as shown by the thick solid line shown by the arrow in FIG. The intermediate temperature water in the intermediate portion of the hot water storage tank 1 is taken out from the second outlet 12 provided in the intermediate portion of the hot water storage tank 1, and led to the second mixing valve 11 through the pipe 13 for mixing. The mixed hot water is guided to the first mixing valve 14 through the pipe 15, while the tap water in the water pipe 22 is first mixed through the pipe 7 and the pressure reducing valve 6 as indicated by the broken line in FIG. The hot water introduced into the valve 14 and the hot water from the hot water storage tank 1 and the tap water from the water pipe 22 are merged by the first mixing valve 14, and the warm water that has been merged and brought to an appropriate temperature is indicated by a dashed line in FIG. Thus, it guide | induces to the mist unit 65 through the piping 64 for mist, and is ejecting in the bathroom from the pore formed in the mist unit 65.

This realizes a mist sauna with a hot water mist function added to the sauna.
In this way, the mist pipe 64 is used for filling by connecting to the joint (joint downstream of the first mixing valve 14) connected to the first mixing valve 14 used for filling shown in FIG. Since medium temperature water having an upper limit temperature of medium temperature, for example, hot water having an upper limit of about 48 ° C. is used for the mist, it does not become high temperature water that is not suitable for mist.
Hereinafter, the structure of each part of the electric water heater S will be described in detail.

<Heat pump unit 8>
The heat pump unit 8 shown in FIG. 1 absorbs the external heat with a refrigerant such as expanded low-temperature carbon dioxide, and then compresses the heat to a high temperature, and the hot water storage as shown by the broken line shown by the white arrow in FIG. This is a device for exchanging heat with low-temperature water introduced from the tank 1 through a pipe 34 to heat the low-temperature water.
The heat pump unit 8 repeatedly expands and compresses the refrigerant, absorbs heat from the outside and heats the low-temperature water, and a circulation pump (not shown) that circulates the low-temperature water in the hot water storage tank 1 flowing through the pipe 34. And.

The heat pump includes a compressor that compresses the refrigerant, a gas cooler (not shown) that heats the low-temperature water by exchanging heat between the compressed high-temperature refrigerant and the low-temperature water from the hot water storage tank 1, and decompresses the refrigerant by expanding the pressure. And an endothermic device that absorbs the heat of the outside air to the refrigerant whose pressure has been reduced and reduced in temperature.
The circulating pump in the heat pump unit 8 is heated to a high temperature after pumping low-temperature water from the hot water storage tank 1 through the pipes 32 and 34 through the gas cooler of the heat pump and heating it, as indicated by the broken arrows in FIG. The warm water that has become is returned to the upper part of the hot water storage tank 1 through the pipe 35.

<Hot water storage tank 1>
In the hot water storage tank 1 shown in FIG. 1, tap water from the water pipe 22 is introduced through the pipe 7, the pressure reducing valve 6, and the pipe 23, as indicated by the broken line shown in FIG. 1. After the water in the hot water storage tank 1 is led to the heat pump unit 8 through the pipe 32, the three-way valve 33 and the pipe 34 and heated by the gas cooler in the heat pump unit 8 to become hot water, the upper part of the hot water storage tank 1 is passed through the pipe 35. And stored in the hot water storage tank 1.

The temperature of the hot water in the hot water storage tank 1 gradually increases from the lower side to the upper side in the vertical direction, and becomes a relatively low, medium and high temperature distribution from the lower part to the upper part in the hot water storage tank 1. Yes. For example, the temperature inside the hot water storage tank 1 is about 90 ° C. and the middle portion is about 50 ° C. In addition, the warm water in the intermediate part of the vertical direction in the hot water storage tank 1 is called intermediate warm water.
Here, in the electric water heater S, in order to efficiently boil the hot water in the hot water storage tank 1, the amount of the intermediate temperature water among the high temperature water, medium temperature water, and low temperature water in the hot water storage tank 1 is reduced. By reducing the amount of boiling of the medium-temperature water by the unit 8 and boiling only the low-temperature water in the hot water storage tank 1, heat loss can be suppressed, and the supplied heat can be sufficiently absorbed and efficient heat exchange can be performed.

Therefore, how to effectively pump the medium temperature water in the hot water storage tank 1 is important in achieving low energy consumption.
In the hot water storage tank 1, a plurality of temperature sensors 48, 49, 50, 51, 52 for detecting the temperature of the hot water stored in the vertical direction are arranged from the upper part to the lower part, and these temperature sensors 48, A detection signal indicating the temperature of the hot water in the hot water storage tank 1 detected by 49, 50, 51, 52 is output to the controller 16 and used for controlling the electric water heater S.

<Water filling circuit 2Y>
In the hot water filling of the bathtub 2, the electric water heater S does not necessarily require hot water as high as the upper part of the hot water storage tank 1, so that the second hot water outlet 12 is provided at the intermediate portion of the hot water storage tank 1, and this Medium temperature water in the hot water storage tank 1 is guided to the second mixing valve 11 through the pipe 13 connected to the second outlet 12, and the second mixing valve 11 is taken out from the first outlet 10 at the upper part of the hot water tank 1 and is connected to the pipe 41. It mixes with the hot water of high temperature led through, and it is set as the structure which performs the hot water filling of the bathtub 2. FIG.
A hot water filling circuit 2 </ b> Y represented by a thick solid line indicated by an arrow in FIG. 1 is a circuit for supplying hot water stored in the hot water storage tank 1 to the bathtub 2 and filling the bathtub 2 with hot water.

  This hot water filling circuit 2Y has a pipe 9 branched from a pipe 41 connected to the first outlet 10 at the upper part of the hot water tank 1 from the hot water at the upper part of the hot water tank 1 as indicated by the thick solid line indicated by the arrow in FIG. Medium temperature water led to the newly provided second mixing valve 11 through the second extraction valve 12 provided in the vertical center of the volume of the hot water storage tank 1 and led through the pipe 13. Mix with. And this mixed warm water is led to the 1st mixing valve 14 through the piping 15, and in the 1st mixing valve 14, from the water pipe 22, the piping 7, the pressure-reduction valve 6, and piping as shown by the broken line of FIG. The pipes 29b and 29a are mixed with the tap water that has passed through 23, and the solenoid valve 28 disposed downstream of the first mixing valve 14 and controlled to open as shown by the thick solid line shown by the arrow in FIG. A configuration in which the bathtub 2 is filled with two paths: a first path that passes through and a second path that is connected to the pipe 3 through the pipe 29b, the branch portion 30, the pipe 25, the pump 27, and the circulation mixing valve 31. It is.

The pipe 29a is connected to the reheating entrance 2i of the bathtub 2, and the piping 3 is connected to the retreating outlet 2o of the bathtub 2, via these two retreating entrances 2i and 2o. The hot water filling is performed.
In this case, the detection signal of the temperature of the hot water detected by the top temperature sensor 47 of the hot water storage tank 1 and the detection of the temperature of the hot water detected by the temperature sensor 49 arranged at the center in the vertical direction of the volume of the hot water storage tank 1. Signal is input to the controller 16, and the controller 16 predicts the temperature of hot water flowing out from the second mixing valve 11 from these two temperatures, flow rates, etc., and determines and controls the valve opening of the second mixing valve 11. ing.

In addition, as a center part of the vertical direction of the volume of the hot water storage tank 1, the position of about 2/5 to 3/5 from the upper direction of the volume of the hot water storage tank 1 is suitable. Thereby, the member which detects the mixing temperature downstream of the second mixing valve 11 is deleted, the system is simplified, and the production cost is reduced.
Here, by switching and controlling the second mixing valve 11 by the controller 16 which will be described later, the high temperature water in the hot water storage tank 1 and the middle temperature water are not mixed, and the temperature is higher than the first outlet 10 at the upper part of the hot water storage tank 1. The water is taken out and led to the second mixing valve 11 through the pipe 41, and only this high temperature water is led to the first mixing valve 14 through the pipe 15 so that the tap water from the water pipe 22 can be merged. Yes.
Further, the intermediate temperature water is taken out from the second outlet 12 at the intermediate portion of the hot water storage tank 1, and only the intermediate temperature water is guided to the second mixing valve 11 through the pipe 13, and only this intermediate temperature water is guided to the first mixing valve 14 through the pipe 15. Thus, the first mixing valve 14 is configured to be merged with tap water from the water pipe 22.

<Piping 64 for mist>
As shown in FIG. 1, the mist pipe 64 is connected to a joint that is connected to the first mixing valve 14 on one side, for example, a T-type screw joint, and the other side is an electromagnetic valve (not shown) in the mist unit 65. It is connected to the.
The mist pipe 64 is provided with a flow switch 62 for detecting whether or not mist is performed by the mist unit 65 and a mist temperature sensor 63 for detecting the temperature of hot water used for the mist. ing. The flow switch 62 and the mist temperature sensor 63 are electrically connected to the controller 16, respectively, and each detection signal is input to the controller 16.

The flow switch 62 is a switch that is turned on when a liquid flows in the pipe 64 and is turned off when the liquid does not flow.
During mist, the flow switch 62 detects that the electromagnetic valve of the mist unit 65 is controlled to be opened and sprayed from the pores and hot water flows through the mist pipe 64, and is turned on. This ON signal is input to the controller 16, and the controller 16 recognizes the operation of the mist.

  The mist temperature sensor 63 detects the temperature of the hot water flowing through the mist pipe 64 at the time of mist, and inputs this detection signal to the controller 16. And the controller 16 controls so that the temperature of the warm water which flows through the piping 64 for mist at the time of mist becomes the temperature of the bath setting mode set by the user.

<Mist unit 65>
The mist unit 65 is connected to a mist pipe 64, and is a normally closed electromagnetic valve (not shown) that is energized and controlled to open when the mist is operated, and a fine mist that ejects hot water supplied through the electromagnetic valve in a mist form. A mist generator (not shown) in which a hole is formed, a heater (not shown) that heats the interior of the bathroom to a predetermined temperature, for example, around 40 ° C., an operation unit (not shown) that a user operates to use the mist sauna, and an operation unit And a control device (not shown) that controls the entire mist unit 65 such as a heater and a solenoid valve.
The heater may be configured integrally with the mist unit 65 or separately. Similarly, the operation unit may be configured integrally with the mist unit 65 or configured separately from the mist unit 65. May be.

<Operation unit 60>
The operation unit 60 shown in FIG. 1 is a device that allows a user to perform input operations for performing hot water filling, chasing, hot water supply, etc., with the electric water heater S, and is disposed in a bath remote controller 45 or a kitchen. There is a kitchen remote control 46 and the like.
The operation unit 60 includes a hot water filling mode for filling the bathtub 2, a reheating mode for replenishing the bath water in the bathtub 2, a hot water supply mode for supplying hot water from the mixer tap 19, a mist in the bathroom, A mist sauna mode for performing a sauna can be selected, and the temperature of hot water at the time of hot water filling, the temperature of hot water at the time of reheating, the temperature of hot water at the time of hot water supply, and the like can be set.
The operation unit 60 is electrically connected to the controller 16 in a wired or wireless manner, and an input operation to the operation unit 60 by a user is input to the controller 16 as an operation signal.

<Controller 16>
The controller 16 is a control device that electronically controls the electric water heater S, and includes a microcomputer that performs control according to signals detected by various sensors such as the operation unit 60 and the temperature sensor 48, and an operation According to the output signal of the control signal from the microcomputer, the input interface such as an amplifier circuit, an A / D converter circuit, etc. that converts the detection signal detected by the unit 60, various sensors, etc. into an input signal suitable for the microcomputer 3. And an output interface such as a drive circuit for driving actuators such as the second mixing valve 11, the first mixing valve 14, and the normally closed electromagnetic valve 28.

The controller 16 controls various actuators such as the electromagnetic valve 28, the second mixing valve 11 and the first mixing valve 14 of the electric water heater S, the heat pump unit 8 and the like according to a program stored in a ROM (Read Only Memory) of the microcomputer. It controls and controls various modes such as hot water filling, chasing, hot water supply, mist sauna and the like.
For example, when the controller 16 switches and controls the second mixing valve 11, high-temperature water passing through the pipe 41 and medium-temperature water passing through the pipe 13 are mixed by the second mixing valve 11 and the pipe 15 passes through the second mixing valve 11. Or only high-temperature water that passes through the pipe 41 flows to the pipe 15 via the second mixing valve 11, or only medium-temperature water that passes through the pipe 13 flows to the pipe 15 via the second mixing valve 11. ing. Further, the controller 16 controls the opening degree of the second mixing valve 11 so that the temperature of the hot water led to the pipe 15 downstream of the second mixing valve 11 becomes a desired temperature.
The mist sauna mode is selected by the user by operating the operation unit of the mist unit 65. Various types of hot water filling, reheating, and hot water supply selected by the operation unit 60 such as the bath remote controller 45 are provided. Can be selected simultaneously with the mode.

  Control of the mist sauna mode by the controller 16 starts when warm water flows through the mist pipe 64 and the flow switch 62 is turned on, so that the on signal is input to the controller 16. The configuration is terminated when the flow switch 62 is turned off because hot water does not flow through the mist pipe 64.

<Configuration of connecting portion of second outlet 12>
FIG. 2 is an enlarged cross-sectional view of part A in the vicinity of the second outlet 12 of the hot water storage tank 1 shown in FIG.
As shown in FIG. 2, a bent portion 13E1 at the end of a portion of the bent pipe 13E of the pipe 13 (see FIG. 1) is inserted into a cylindrical tank side joint 67 fixed to the hot water storage tank 1. When the fastener 68 (see FIG. 4D) is elastically deformed, the tank side joint 67 and the straight pipe portion 13E3 of the bent pipe 13E are gripped by the elastic force, and the tank side joint 67 and the bent pipe of the hot water storage tank 1 are held. 13E is connected.

With this configuration, the bent pipe 13 </ b> E of the pipe 13 shown in FIG. 1 is rigidly fixed to the tank side joint 67 fixed to the hot water storage tank 1 by the elastic force of the quick fastener 68.
As shown in FIG. 2, two O-rings 66 are attached to the outer peripheral portion of the joint portion 13E2 of the bent pipe 13E, and the insertion hole 67d of the tank side joint 67 fixed to the hot water storage tank 1 and the bent pipe 13E. The two O-rings 66 close and seal the gap between the insertion hole 67d of the tank side joint 67 and the joint portion 13E2 of the bent pipe 13E so that water does not leak from between the joint portion 13E2 and the joint portion 13E2. The number of O-rings is not limited to two, and may be one or three or more.

Hereinafter, each structure of the connection part of the 2nd outlet 12 is demonstrated.
FIG. 3A is an exploded view of a portion A in the vicinity of the second outlet 12 shown in FIG. 1, and FIG. 3B is a longitudinal sectional view of the bent tube 13E shown in FIG. is there.
As shown in FIG. 3A, the side wall plate 1s of the hot water storage tank 1 is provided with a mounting hole 1k having a predetermined diameter by, for example, burring. Specifically, the attachment hole 1k is formed in a central portion in the vertical direction of the hot water storage tank 1 (that is, a portion in which medium temperature water can stay over a predetermined height range among high temperature water, medium temperature water, and low temperature water). Is formed.

<Tank side joint 67>
As shown in FIG. 3A, the tank side joint 67 has a small-diameter tank mounting portion 67a, a medium-diameter barrel portion 67b, and a large-diameter flange portion 67c, and an insertion hole 67d therein. For example, it is manufactured by pressing a stainless steel pipe such as SUS316. The inner diameter of the insertion hole 67d of the tank side joint 67 and the inner diameter of the opening 67e1 are set to dimensions that allow passage of a part of the bent pipe 13E of the pipe 13 to be described later.

<Bend tube 13E>
As shown in FIG. 3, a bent pipe 13E (see FIG. 2) of a part of the pipe 13 connected to the central portion of the hot water storage tank 1 shown in FIG. 1 (the central portion in the vertical direction of the volume of the hot water storage tank 1) A bent portion 13E1 at the end accommodated in the hot water storage tank 1, a joint portion 13E2 in which a groove portion m (see FIG. 3B) in which two O-rings 66 are mounted, and a quick fastener 68 are attached. An elbow pipe having a straight pipe portion 13E3.
The bending tube 13E is formed by injection molding using, for example, PPS (polyphenylene sulfide resin) which is a thermoplastic resin.
The bent tube 13E may be formed as an integral part by manufacturing the pipe portion and the joint portion separately using, for example, stainless steel such as SUS316L, and connecting them by welding. Is not limited to resin molded products.

<O-ring 66>
The O-ring 66 shown in FIG. 3A is a ring-shaped part having a circular cross section (see FIG. 3B) formed using, for example, synthetic rubber as a main raw material.
As shown in FIGS. 3A and 3B, the O-ring 66 is attached to the groove portion m of the joint portion 13E2 of the bent tube 13E, and the bent tube 13E is fixed to the hot water storage tank 1 as shown in FIG. When attached to the tank-side joint 67, the insertion hole 67d of the tank-side joint 67 of the hot water storage tank 1 and the bent pipe are elastically deformed by contact with the insertion hole 67d of the body 67b of the tank-side joint 67. The gap between the joint portion 13E2 of 13E is closed and sealed, and the hot water in the hot water storage tank 1 is prevented from leaking from between the tank side joint 67 of the hot water storage tank 1 and the joint portion 13E2 of the bent pipe 13E. is doing.

<Quick fastener 68>
The quick fastener 68 shown in FIGS. 2 and 3 is a part formed by pressing using a stainless steel plate such as SUS304 having a thickness of 1 mm, for example.
4 (a) is a view in the C direction of the quick fastener 68 shown in FIG. 3 (a), and FIG. 4 (b) is a left side view of the quick fastener 68 shown in FIG. 4 (a). 4 (c) is a top view of the quick fastener 68 shown in FIG. 4 (a), and FIG. 4 (d) is a perspective view of the quick fastener 68 shown in FIG. 4 (b) as viewed obliquely from above in the D direction. FIG.

  As shown in FIG. 4, the quick fastener 68 is a substantially cylindrical pipe having a smaller diameter than the straight pipe portion 13E3 in order to grip the straight pipe portion 13E3 of the bent pipe 13E (see FIG. 2) with elasticity. In order to grip the grip portion 68a and the body portion 67b (see FIG. 2) of the tank side joint 67 fixed to the hot water storage tank 1 with elasticity, the substantially cylindrical joint grip having a smaller diameter than the body portion 67b. The connection part which connects the pipe | tube holding part 68a and the joint holding part 68b, the flange insertion hole 68c which the flange part 67c of the tank side joint 67 fixed to the hot water storage tank 1 is inserted and engaged (refer FIG. 2), and the pipe part 68b. A portion 68d and an attachment guide 68e that is continuous with the pipe gripping portion 68a and the joint gripping portion 68b and gradually opens outward (see FIG. 4A) are formed.

  The connecting member is not limited to the quick fastener that connects the pipe fixing member and the tapping pipe by an elastic force, and any connecting member can be used as long as the tapping pipe can be fixed so as not to be detached from the pipe fixing member. It may be a thing.

<< Assembly of connecting part of second outlet 12 >>
Next, the assembly of the connecting portion of the second outlet 12 of the hot water storage tank 1 will be described.
The tank side joint 67 shown in FIG. 3A has a small tank attachment portion 67a fitted into the attachment hole 1k of the side wall plate 1s of the hot water storage tank 1 as indicated by the white arrow α1 in FIG. Then, it is fixed to the mounting hole 1k of the hot water storage tank 1 by seal welding (see FIG. 2).
On the other hand, as shown in FIG. 3A, two O-rings 66 are respectively attached to the grooves m of the bent tube 13E shown in FIG.

  Then, the bent pipe 13E is fitted into the opening 67e1 (see FIG. 3 (a)) of the tank side joint 67 fixed to the mounting hole 1k of the hot water storage tank 1 from the bent portion 13E1 at the tip, as shown in FIG. The two O-rings 66 attached to the groove portion m (see FIG. 3B) of the bent pipe 13E are pressed into the insertion hole 67d of the tank side joint 67 fixed to the hot water storage tank 1, and FIG. A bent pipe 13E to which two O-rings 66 shown in FIG. 2 are attached is fitted to a tank side joint 67 fixed to the mounting hole 1k of the hot water storage tank 1.

  Next, the quick fastener 68 shown in FIG. 4 is connected to the bent pipe 13E (see FIG. 2) attached to the tank side joint 67 fixed to the hot water storage tank 1 by the white arrow α2 in FIG. The guides 68e and 68e of the quick fastener 68 are moved as shown in FIG. 2, and the straight pipe portion 13E3 (see FIG. 2) and is opened outward, and the quick fastener 68 is elastically deformed to elastically deform the hot fastener 68 at the joint gripping portion 68b (see FIGS. 4A and 4D) of the quick fastener 68. 2 is attached to the tank side joint 67 of the hot water storage tank 1 with the pipe gripping part 68a (see FIGS. 4A and 4D) of the quick fastener 68. I was holding the straight tube portion 13E3 (see FIG. 2) of the bending pipe 13E, mounting the quick fastener 68, the bending tube 13E attached to the tank-side joint 67 and the tank side joint 67 of the hot water storage tank 1.

At this time, as shown in FIG. 2, the flange portion 67 c of the tank side joint 67 fixed to the hot water storage tank 1 is fitted into the flange insertion hole 68 c of the quick fastener 68, and the flange of the tank side joint 67 is inserted. The flange insertion hole 68c of the quick fastener 68 is engaged with the portion 67c.
2, the tank side joint 67 of the hot water storage tank 1 and the bent pipe 13E attached to the tank side joint 67 are rigidly connected and fixed by the quick fastener 68.

<Effect>
According to the above configuration, as a means for connecting the hot water storage tank 1 and the pipe 13 (see FIG. 1) for taking out the medium temperature water from the hot water storage tank 1, a means for connecting with the quick fastener 68 shown in FIG. Unlike the technology, it is not necessary to match the direction of the pipe in the hot water storage tank 1 with the screwing allowance, and the direction of the bent portion 13E1 of the pipe 13 with respect to the hot water storage tank 1 can be easily adjusted.
For example, in the conventional means for connecting the hot water storage tank 100 and the pipe 101 for extracting hot water from the hot water storage tank 100 shown in FIG. 7, in order to make the bent portion 101k of the pipe 101 downward in the hot water storage tank 100, FIG. It is necessary to match the screwing allowance between the female screw 102n of the joint 102 on the hot water storage tank 100 side and the male screw 103n of the joint 103 on the pipe 101 side shown in FIG. That is, the bent portion 101k of the pipe 101 must be directed downward in the hot water storage tank 100 in accordance with the screwing condition of the joint 103 on the pipe 101 side.
For this reason, there is a difficulty in workability for obtaining a mounting accuracy in which the bent portion 101k of the pipe 101 faces downward in the hot water storage tank 100.
In addition, since the connection is possible regardless of the direction of the bent portion 101k of the pipe 101, for example, the bent portion 101k of the pipe 101 may be attached upward, which easily affects the performance. There is an inconvenience.
Furthermore, by attaching the bent portion 101k of the pipe 101 downward in the hot water storage tank 100, there are cases where the coupling degree of screwing is lowered, and there is a problem that water leaks easily from the screw portion.
By adopting the means for connecting with the quick fastener 68 or the like of the first embodiment, the above-mentioned conventional problems are solved.
Further, since the bent portion 13E1 at the tip of the bent tube 13E is bent, as shown in FIGS. 1 and 2, the bent portion 13E1 of a portion of the bent tube 13E of the pipe 13 is surely turned downward. Can do.

Therefore, the hot water in the hot water storage tank 1 having a relatively low temperature gradient is effectively and easily pumped out by the bent portion 13E1 of the bent pipe 13E, and the hot water in the hot water storage tank 1 is made as hot and cold water as possible. The low temperature water in the lower part of the hot water storage tank 1 can be effectively heated by the heat pump unit 8.
Therefore, the heat loss in the operation of the heat pump unit 8 can be suppressed, the heat energy can be used efficiently, and the heat efficiency can be improved.

Further, as shown in FIG. 2, a connecting portion between a tank side joint 67 fixed to the hot water storage tank 1 and a joint portion 13E2 of a bent pipe 13E of a pipe 13 (see FIG. 1) is replaced with a conventional screwed portion. In addition, since the O-ring 66 is used for the sealing, the sealing can be ensured regardless of the screwed state as in the prior art.
Thereby, unlike the conventional screw type, while improving the sealing performance of the connecting portion between the hot water storage tank 1 and the pipe 13 (see FIG. 1), the pipe 13 (see FIG. 1) in the hot water storage tank 1 is turned downward so Pumps out effectively, improving thermal efficiency and saving energy.

<< Modification 1 >>
In the first modification, a part of the bent pipe 13E (see FIG. 2) of the pipe 13 (see FIG. 1) of the above embodiment is changed to a straight straight pipe 23E as shown in FIG.
FIG. 5 is a view showing a part of the straight pipe 23E of the pipe 13 (see FIG. 1) according to the first modification, and the portions corresponding to the bent pipe 13E of the embodiment are denoted by reference numerals in the 20s. Show.
In the first modification, the tank inner pipe portion 23E1 accommodated in the hot water storage tank 1 only needs to have at least a straight shape.
Other configurations are the same as those in the above embodiment.

According to the modification 1, since a part of the pipe 13 (see FIG. 1) attached to the hot water storage tank 1 is a straight straight pipe 23E, a part of the straight pipe 23E of the pipe 13 (see FIG. 1) is a hot water storage tank. It is easy to insert from the 1 mounting hole 1k, and the mounting work is easy and the workability is improved.
Further, since the straight straight pipe 23E is used, the manufacturing is easy and the cost of parts can be reduced.

<< Modification 2 >>
In the second modification, a part of the bent pipe 13E (see FIG. 2) of the pipe 13 of the embodiment shown in FIG. 1 is changed to a substantially S-shaped S-shaped pipe 33E as shown in FIG. is there.
FIG. 6 is a view showing a part of the S-shaped pipe 33E of the pipe 13 (see FIG. 1) according to the second modification, and the reference numerals in the 30s are attached to the bent pipe 13E according to the embodiment. And show.

As shown in FIG. 6, a part of the S-shaped pipe 33E of the pipe 13 attached to the hot water storage tank 1 (see FIG. 1) of the modified embodiment 2 includes a tank inner pipe portion 33E1 accommodated in the hot water storage tank 1, and A straight pipe portion 33E2 formed continuously from the tank inner pipe portion 33E1, a joint portion 33E3 formed at a part of the straight pipe portion 33E2, and a hot water tank 1 formed continuously from the straight pipe portion 33E2. And a tank outer pipe portion 33E4 to be arranged.
Here, the tank inner pipe part 33E1 accommodated in the hot water storage tank 1 in the S-shaped pipe 33E and the tank outer pipe part 33E4 arranged outside the hot water storage tank 1 are formed so as to be substantially in the same plane. Yes.
Other configurations are the same as those in the above embodiment.

According to the modified embodiment 2, in addition to the operational effects of the above-described embodiment, the tank inner pipe portion 33E1 and the tank outer pipe portion 33E4 of the S-shaped pipe 33E are formed so as to be substantially flush with each other. If one side tank outer pipe portion 33E4 arranged outside 1 is upward, the other side tank inner pipe portion 33E1 accommodated in the hot water storage tank 1 faces downward. It is possible to easily determine whether the tank inner pipe portion 33E1 accommodated in the tank faces downward.
Therefore, the tank inner pipe portion 33E1 accommodated in the hot water storage tank 1 of a part of the S-shaped pipe 33E of the pipe 13 (see FIG. 1) can be extremely easily adjusted downward, and the assembling workability is improved.

In the second modification, the tank outer pipe part 33E4 outside the hot water tank 1 is relatively angled by 180 degrees with respect to the tank inner pipe part 33E1 facing downward in the hot water tank 1. In the illustrated example, the tank outer pipe portion 33E4 outside the hot water tank 1 is relatively set to a predetermined angle such as 90 degrees or 270 degrees with respect to the tank inner pipe section 33E1 facing downward in the hot water tank 1. It can also be configured.
Also in this case, since the inclination angle of the tank outer pipe part 33E4 outside the hot water tank 1 with respect to the tank inner pipe part 33E1 directed downward in the hot water tank 1 is determined in advance, the tank outer pipe part 33E4 outside the hot water tank 1 is determined. Therefore, it can be easily determined that the tank inner pipe portion 33E1 in the hot water storage tank 1 faces downward.

<< Modification 3 >>
In the modified embodiment 3, as a means for heating the water or hot water in the hot water storage tank 1, an electric heater 70 (indicated by a two-dot chain line in FIG. 1) is provided in the hot water storage tank 1 instead of the heat pump unit 8 shown in FIG. It is the structure to provide.
According to the structure of the modification 3, since the heat pump unit 8 and the pipe connected to the heat pump unit 8 are eliminated, the cost can be reduced.

<< Modification 4 >>
In variant 4, in addition to the heat pump unit 8 shown in FIG. 1, an electric heater 70 (indicated by a two-dot chain line in FIG. 1) is provided in the hot water storage tank 1 as means for heating the water or hot water in the hot water storage tank 1. It is provided.
According to the configuration of the modified embodiment 4, for example, in a snowfall area, the water or hot water in the hot water storage tank 1 is heated by the electric heater 70 during the daytime using the snowmelt power for heating supplied during the daytime, while at night, the snowmelt is performed. The water or hot water in the hot water storage tank 1 can be heated using the heat pump unit 8 when the power is stopped.

Thus, the flexible electric water heater S can be operated by using the heat pump unit 8 and the electric heater 70 as means for heating the water or hot water in the hot water storage tank 1 of the electric water heater S.
Further, the controller 16 has a function of determining whether the heat pump unit 8 or the electric heater 70 is used to save energy, and the operation of heating water or hot water in the hot water storage tank 1 is performed by this determination function. Thus, as described above, energy-saving operation corresponding to various conditions is possible.

It is a lineblock diagram showing an example of an electric water heater concerning an embodiment of the present invention. It is A section expanded sectional view of the 2nd take-out vicinity of the hot water storage tank of the electric water heater shown in FIG. (a) is the exploded view which expanded the A section near the 2nd outlet of the hot water storage tank of the electric water heater shown in FIG. 1, (b) is a longitudinal cross-sectional view of the bent pipe shown in (a). . (a) is a C direction arrow view of the quick fastener shown in FIG. 3 (a), (b) is a left side view of the quick fastener shown in (a), (c) is (a) (D) is a perspective view of the quick fastener shown in (b) as viewed obliquely from above in the D direction. It is the figure which showed a part of straight pipe of the piping connected to the hot water storage tank of the modification 1. It is the figure which showed a part of S-shaped pipe of piping connected to the hot water storage tank of the modification 2. (a) is an expanded sectional view of the connection part which connects the conventional hot water storage tank and the pipe which takes out hot water from the hot water storage tank, (b) is the conventional hot water storage tank and hot water storage shown in (a) It is an enlarged exploded view including the partial cross section of the connection part which connects the pipe which takes out hot water from the inside of a tank.

Explanation of symbols

1 Hot water storage tank (hot water storage tank)
1k Hot water storage tank mounting hole (pipe mounting hole)
8 Heat pump unit (heating means, heat pump)
10 First outlet (upper hot water outlet)
11 Second mixing valve (warm water extraction switching means, mixing means)
16 Controller (Upper hot water removal means, hot water removal switching means, mixing means)
41 Piping (Upper hot water removal means)
66 O-ring (seal member)
67 Tank side joint (pipe fixing member)
67d Tank side joint insertion hole (Hot water outlet hole for pipe fixing member)
68 Quick fastener (connecting member)
70 Electric heater (heating means)
13E Bent pipe (Tap pipe)
13E2 joint (fitting part)
13E1 bent portion (tip end of tap pipe of claim 2)
33E1 tank inner pipe (tip of the outlet pipe of claim 3)
33E4 tank outer pipe (placed outside the hot water storage tank of the outlet pipe of claim 3)
S Electric water heater (water heater)

Claims (6)

A water heater comprising a heating means for heating water or hot water and a hot water storage tank for storing hot water heated by the heating means,
A pipe fixing member having a hot water extraction holes being fixed to the pipe mounting holes formed in the central portion, thereby flow through the hot water of the hot water stocking tank in the vertical direction of the hot-water stocking tank,
A hot water outlet pipe having a fitting portion fitted into the hot water outlet hole of the pipe fixing member, and a sealing member for closing and sealing a gap between the fitting portion and the hot water outlet hole of the pipe fixing member;
In the state where the fitting portion of the hot water pipe is fitted in the hot water outlet hole of the pipe fixing member, the connecting member connecting the pipe fixing member and the hot water pipe ,
The tip of the hot water pipe protrudes inside the hot water storage tank from the pipe fixing member,
The hot water supply apparatus, wherein the fitting portion to be fitted to the pipe fixing member is provided so as to protrude from a distal end portion of the hot water discharge pipe to a base end side and radially outward of the hot water discharge pipe . The connecting member has a pipe gripping part for gripping the tapping pipe, and a joint gripping part for gripping a joint part of the pipe fixing member,
The water heater according to claim 1, wherein the joint gripping portion has a gripping portion space larger than the pipe gripping portion . The connecting member is elastically deformed so as to grip the pipe fixing member and a part of the hot water pipe in a state where the fitting portion of the hot water pipe is fitted in the hot water outlet hole of the pipe fixing member. The water heater according to claim 2 , wherein the water heater is attached . As for the said hot-water pipe, the tank inner pipe part accommodated in the said hot water storage tank is comprised by a straight tube shape.
The water heater according to any one of claims 1 to 3, wherein the water heater is provided. The hot water supply apparatus according to any one of claims 1 to 3 , wherein the hot water discharge pipe is formed with a front end portion accommodated in the hot water storage tank facing downward. The hot water discharge pipe is formed such that a tip portion accommodated in the hot water storage tank is directed downward and a portion disposed outside the hot water storage tank is formed upward. 5. A water heater according to 5.

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