JP2015158359A - hot water storage tank unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage tank unit that enables stable fixation even when a hot water storage tank is in the high mass state, can prevent corrosion caused by electric corrosion and further can suppress leakage of heat of hot water within the hot water storage tank.SOLUTION: A hot water storage tank unit includes: a hot water storage tank 7 for storing hot water; a metallic cylindrical tank leg 20 that is installed in a lower end plate 7b of the hot water storage tank 7 and has an opening in a lower portion opposing to the lower end plate 7b; an end plate heat insulating tool 22 that is installed to cover the lower end plate 7b located within the opening of the cylindrical tank leg 20; and a base heat insulating tool 23 with insulation properties that is arranged between the cylindrical tank leg 20 and a base plate 12b. The end plate heat insulating tool 22 is press-fitted into the opening of the cylindrical tank leg 20 and fixed.

Description

  The present invention relates to a hot water storage tank unit used in, for example, a water heater and a hot water facility.

Conventionally, this type of hot water storage tank unit reduces heat radiation by installing a heat insulator on the outer peripheral surface of the hot water storage tank.
For example, in order to realize cost saving and downsizing of equipment, vacuum insulators that are expensive but have high heat insulating properties, low capacity and can suppress heat dissipation are applied only to parts with high heat dissipation, and other parts are The structure which makes cost and a product dimension compatible is proposed by applying the heat insulation cheaper than the vacuum heat insulation and inferior to heat insulation (for example, refer patent document 1).
In addition, the above-mentioned vacuum insulator is applied only to a portion having a dimensional constraint, and a portion having a dimensional allowance is provided with a cost that is lower than that of the vacuum insulator but is cheaper. The structure which makes a product size compatible is proposed (for example, refer patent document 2).

JP 2007-155274 A JP 2005-226965 A

However, in the techniques described in Patent Documents 1 and 2 described above, heat insulation, cost saving, and downsizing are considered, but the hot water storage tank is not stably fixed and heat insulating structure, and the hot water storage tank is large. When the mass becomes high as in the case of a tank or hot water storage, there is a possibility that an unstable installation state may occur, and there is a problem that practical application is difficult.
Moreover, even if the hot water storage tank is directly fixed to a metal base plate with sufficient strength, there is a concern that heat is radiated from the hot water storage tank to the metal base plate and heat loss increases. Furthermore, when the hot water storage tank and the metal base plate are made of different metals, there is a problem that corrosion due to electrolytic corrosion is a concern.

  The present invention has been made to solve the above problems, and can stably fix the hot water storage tank even when the hot water storage tank is in a high mass state, can prevent corrosion due to electrolytic corrosion, and can further maintain hot water in the hot water storage tank. An object of the present invention is to provide a hot water storage tank unit that can suppress heat leakage.

  A hot water storage tank unit according to the present invention includes a hot water storage tank for storing hot water, a first metal tank leg provided on a lower end plate of the hot water storage tank and having a lower opening facing the lower end plate, and a first tank. A first heat insulator installed so as to cover the lower end plate located in the opening of the leg, and a second heat insulator having insulation provided between the first tank leg and the base plate. The first heat insulator is press-fitted into the opening of the first tank leg and fixed.

According to the present invention, since the insulating second heat insulator is interposed between the metal first tank leg and the metal base plate, the first tank leg and the base plate are different from each other. Even if it is made of metal, corrosion due to electric corrosion can be prevented, sufficient strength can be maintained even during long-term use, and safety is high and corrosion resistance is excellent.
Moreover, the installation of the second heat insulator can suppress heat radiation from the lower end plate of the hot water storage tank.
Further, since the lower end plate located in the opening of the first tank leg is covered with the first heat insulator, heat radiation from the lower end plate of the hot water storage tank to the base plate can be suppressed. It is possible to provide a hot water storage tank unit with improved energy efficiency.

It is a schematic block diagram of the air conditioning system which shows the hot water storage tank which concerns on embodiment of this invention applied to an indoor unit. It is a perspective view which shows the external appearance of the indoor unit of FIG. It is a perspective view of the indoor unit which removes and shows the design panel of the near side of the indoor unit of FIG. It is a perspective view of the indoor unit which shows through the design panel of the upper surface and one side surface of the indoor unit of FIG. It is a perspective view which shows the upper heat insulation and trunk | drum board heat insulation provided in the hot water storage tank of FIG. FIG. 6 is an enlarged longitudinal sectional view of a lower part of a hot water storage tank surrounded by a broken line XX shown in FIG. 5. It is a perspective view which shows the lower end plate of the hot water storage tank of FIG. It is a perspective view of the mirror-plate heat insulating tool which covers the lower mirror plate shown in FIG. It is a perspective view of the base heat insulating tool shown in FIG.

FIG. 1 is a schematic configuration diagram of an air conditioning system in which a hot water storage tank according to an embodiment of the present invention is applied to an indoor unit.
1 includes an outdoor unit (heat pump unit) 1 of an air conditioner, an indoor unit (cylinder unit) 30 equipped with devices such as a hot water storage tank unit having a hot water storage tank 7 for storing hot water, And a radiator 8. The outdoor unit 1 is configured to be able to operate a heat pump cycle (refrigeration cycle). The indoor radiator 8 is composed of a floor heating panel or a radiator.

  This air conditioning system heats water stored in the hot water storage tank 7 by exchanging heat between the refrigerant in the refrigerant circuit of the heat pump and the water in the water circuit, and circulating the water. It is comprised as a heat pump type hot-water supply system which can be air-conditioned by the indoor radiator 8 provided in the.

  The outdoor unit 1 and the indoor unit 30 are connected via the refrigerant pipe 13 and the electrical wiring. The outdoor unit 1 includes a refrigerant circuit including an air / refrigerant heat exchanger that performs heat exchange between outdoor air and the refrigerant, a compressor that compresses the refrigerant, an expansion valve, and the like. The indoor unit 30 and the indoor radiator 8 are connected via a water pipe 14 and electrical wiring.

  In addition to the hot water tank unit, the indoor unit 30 includes a water / refrigerant heat exchanger 2 that performs heat exchange between the refrigerant in the refrigerant circuit and the water in the water circuit, and a pump 3 that circulates the water in the water circuit. The booster heater 4 that further heats the hot water after being heated by the water / refrigerant heat exchanger 2 during heating, the expansion tank 5 that absorbs the pressure in the water circuit, and the operation control of this system are performed. A control device 6 and a three-way valve 9 as a flow path switching means for switching the circulation destination of the water exchanged by the water / refrigerant heat exchanger 2 are mounted. The water / refrigerant heat exchanger 2 is connected to the outdoor unit 1 through a refrigerant pipe 13. The three-way valve 9 switches the water circulation destination according to a control signal from the control device 6.

  In addition, the thin solid line arrow in FIG. 1 shows the flow direction of the refrigerant at the time of heating, the broken line arrow shows the flow direction of the refrigerant at the time of cooling, and the thick solid line arrow shows the flow direction of water. In addition, the components in the broken line frame indicate the components in the indoor unit 30, and the thin solid line indicates a signal line (wiring) to the control device 6.

  As will be described later, the hot water storage tank unit described above is provided on the outer peripheral surface of the hot water storage tank 7, a metal cylindrical tank leg (first tank leg) provided on the lower end plate of the hot water storage tank 7, and the cylindrical tank leg. A plurality of metal L-shaped tank legs (second tank legs) provided in the circumferential direction, and a panel heat insulator (first panel) installed so as to cover a lower panel positioned in the opening of the cylindrical tank legs. And a base heat insulator (second heat insulator) provided between the cylindrical tank leg and the L tank leg and the base plate. Inside the hot water storage tank 7, an in-tank heat exchanger 71 that performs heat exchange between the water in the water circuit and the water stored in the hot water storage tank 7 is installed.

  During the heating operation or the heating operation for heating the water stored in the hot water storage tank 7, the refrigerant flows in the direction of the thin solid arrow between the outdoor unit 1 and the water / refrigerant heat exchanger 2. In this case, the water sent to the water / refrigerant heat exchanger 2 by the pump 3 is heated by the refrigerant from the outdoor unit 1 in the water / refrigerant heat exchanger 2 to become hot water (hot water). This hot water reaches the three-way valve 9 via the booster heater 4 and flows to either the indoor radiator 8 or the in-tank heat exchanger 71.

  When the three-way valve 9 is switched to the indoor radiator 8 side, the hot water circulates through the indoor radiator 8 and the room in which the indoor radiator 8 is installed is in a heating state. If the three-way valve 9 has been switched to the tank heat exchanger 71 side, the hot water circulates through the tank heat exchanger 71 and heats the water stored in the hot water storage tank 7. Then, the hot water that has passed through either the indoor radiator 8 or the in-tank heat exchanger 71 becomes low-temperature water, and the water returns to the water / refrigerant heat exchanger 2 via the pump 3 and is returned to the outdoor unit again. It is heated by the refrigerant from 1 and circulates.

  During the cooling operation, the refrigerant flows between the outdoor unit 1 and the water / refrigerant heat exchanger 2 in the direction of the broken arrow in FIG. In this case, the water sent to the water / refrigerant heat exchanger 2 by the pump 3 is cooled by the refrigerant from the outdoor unit 1 in the water / refrigerant heat exchanger 2 to become cold water. By circulating this cold water to the indoor radiator 8 through the same path as described above, the room is cooled.

  The hot water storage tank 7 has a substantially cylindrical shape, and at least its outer shell is made of a metal material such as stainless steel. A water supply pipe 10 is connected to the lower part of the body plate of the hot water storage tank 7 to supply water from a water supply outside the system. The water supplied from the water supply pipe 10 flows into the hot water storage tank 7 and is stored. By performing the heating operation described above, the water stored in the hot water storage tank 7 is heated and hot water is generated. In the hot water storage tank 7, a temperature stratification is formed in which the upper side is hot and the lower side is low, and hot water is stored.

  A hot water discharge pipe 11 for taking out hot water generated in the hot water storage tank 7 is connected to the upper part of the body plate of the hot water storage tank 7. Hot water generated in the hot water storage tank 7 is supplied to the outside of the present system through the hot water piping 11 and used as domestic water or the like. In the hot water storage tank 7, a body plate heat insulator and an upper heat insulator are used in addition to the end plate heat insulator and the base heat insulator so that the heat dissipation of the stored hot water is suppressed. These heat insulators will be described later.

  2 is a perspective view showing the appearance of the indoor unit of FIG. 1, FIG. 3 is a perspective view of the indoor unit with the design panel on the near side of the indoor unit of FIG. 2 removed, and FIG. 4 is a top view of the indoor unit of FIG. It is a perspective view of the indoor unit which shows through the design panel of the side surface of one side seeing through. FIG. 4 shows a state where the control device 6 shown in FIG. 3 is removed.

  The indoor unit 30 is, for example, formed in a substantially rectangular parallelepiped shape as shown in FIG. 2, and is covered with a design panel 12 configured by applying a paint to a sheet metal material or the like. As shown in FIGS. 3 and 4, the indoor unit 30 includes a water / refrigerant heat exchanger 2, a pump 3, a booster heater 4, an expansion tank 5, a control device 6, a hot water storage tank 7, and a three-way valve. 9. Each device such as piping is housed. As shown in FIGS. 2 and 3, the design panel 12 a on the upper surface of the indoor unit 30 includes a refrigerant pipe 13 that connects the outdoor unit 1, a water pipe 14 that connects the indoor radiator 8, A plurality of holes for passing through the water supply pipe 10 and the hot water supply pipe 11 connected from the outside of the system are provided.

  The indoor unit 30 is installed in a room including a shower room, for example. In a usage environment in which a shower is used in the vicinity of the indoor unit 30, water may splash in the indoor unit 30, but the charging unit and the control device 6 of each electrical device arranged in the indoor unit 30. Has been waterproofed to prevent deterioration and failure of each device in the indoor unit 30 due to water intrusion.

  5 is a perspective view showing an upper heat insulator and a body plate heat insulator provided in the hot water storage tank of FIG. 1, and FIG. 6 is a vertically enlarged cross-sectional view of the lower part of the hot water storage tank surrounded by a broken line XX shown in FIG. 7 is a perspective view showing the lower end plate of the hot water storage tank of FIG. 5 as viewed from below, FIG. 8 is a perspective view of the end plate insulator covering the lower end plate shown in FIG. 7, and FIG. 9 is a perspective view of the base insulator shown in FIG. It is.

  As shown in FIGS. 5 and 6, the hot water storage tank 7 has an upper end plate 7 a on the upper portion of the cylindrical body plate and a lower end plate 7 b on the lower portion of the body plate. An upper heat insulating member 17 (third heat insulating member) using a heat insulating material such as foamed polystyrene is provided on at least a part of the upper outer peripheral surface of the cylindrical body plate and the upper end plate 7a. The upper heat insulator 17 suppresses heat leakage from the upper part of the hot water storage tank 7.

  A body plate heat insulator 16 (fourth heat insulator) is wound around the outer peripheral surface of the body plate excluding the upper heat insulator 17 of the hot water storage tank 7. The body heat insulator 16 is in the form of a single sheet formed in a substantially rectangular shape when not mounted on the hot water storage tank 7. The vertical length in the height direction of the hot water storage tank 7 of the body heat insulator 16 is defined between the lower end of the upper heat insulator 17 and the base heat insulator 23 (see FIG. 6) located below the lower end plate 7b of the hot water tank 7. It is almost the same as the length between. As a result, the upper end of the body heat insulator 16 is in contact with the upper heat insulator 17, and the lower end of the body heat insulator 16 is in contact with the base heat insulator 23, so that heat leakage from the gap is reliably suppressed. Yes.

  Further, the lateral length of the trunk plate insulator 16 perpendicular to the height direction of the hot water storage tank 7 is substantially the same as the circumferential length of the trunk plate of the hot water storage tank 7. Thereby, the trunk | drum board heat insulation tool 16 makes | forms a cylindrical shape in the state wound around the hot water storage tank 7, and covers the outer peripheral surface of the trunk | drum of the hot water storage tank 7 over a perimeter. When the trunk plate insulator 16 is wound around the trunk plate of the hot water storage tank 7, both end portions of the trunk plate insulator 16 face each other so as to face each other. In this state, both ends are sewn through the connection band 19 to the connection holes 18 provided at both ends of the body heat insulator 16. The connecting band 19 is made of a heat-resistant resin material, and can be sewn manually without using a special tool. For this reason, it is possible to easily fix the trunk plate insulator 16 in a state of being in close contact with the outer peripheral surface of the trunk plate of the hot water storage tank 7.

  As shown in FIG. 6, the hot water storage tank 7 is attached to the lower end plate 7b, and has a cylindrical cylindrical tank leg 20 (first tank leg) having a lower opening facing the lower end plate 7b, and a cylindrical tank. A plurality of metal L-shaped tank legs 21 (second tank legs) fixed to the outer peripheral surface of the legs 20 and a metal fixed to the plurality of L-shaped tank legs 21 with the base insulator 23 interposed therebetween. The base plate 12b is fixed in a self-standing manner in the indoor unit 30. The base plate 12b is made of a metal having a strength that can sufficiently withstand the weight of the indoor unit 30 including the hot water storage tank 7 in a full state. Both ends of the base plate 12b are formed in an L shape, the center is recessed downward, and the surface thereof is flush with the horizontal portions of both ends.

  The cylindrical tank legs 20 are joined to the lower end plate 7b by welding, and as shown in FIG. 7, for example, four L-shaped tank legs 21 are fixed to the outer peripheral surface of the cylindrical tank legs 20 in the circumferential direction. It is joined to the outer peripheral surface of the cylindrical tank leg 20 by bolts or welding. The L-shaped tank legs 21 are arranged such that one side 21 a extending outward from the outer peripheral surface of the cylindrical tank legs 20 is flush with the end surface 20 a of the cylindrical tank legs 20. By making one side 21a of the L-shaped tank leg 21 and the end surface 20a of the cylindrical tank leg 20 the same plane, the load of the hot water storage tank 7 can be dispersed and the structure is difficult to fall. Note that the shape of the cylindrical tank leg 20 is not limited to the cylindrical shape as long as the hot water storage tank 7 can be made stable and independent.

  On the lower end plate 7b positioned in the opening of the cylindrical tank leg 20, for example, a end plate insulator 22 (first insulator) having a shape (for example, a circle) as shown in FIG. 8 is in close contact with the surface of the lower end plate 7b. It is installed as follows. By installing this end plate heat insulator 22, heat radiation from the lower end plate 7b to the space 24 between the lower end plate 7b and the base plate 12b can be prevented. The end plate heat insulator 22 uses a nonwoven fabric such as felt because the heat radiation from the lower end plate 7b is relatively low due to the water temperature distribution in the hot water storage tank 7. This non-woven fabric such as felt is an inexpensive material, although its heat insulation performance is inferior to that of the body heat insulator 16 and the upper heat insulator 17.

  Moreover, since the outer dimension of the end plate heat insulator 22 is larger than the inner diameter of the opening of the cylindrical tank leg 20, it is pressed into the inner wall of the cylindrical tank leg 20. Further, since the lower end plate 7b is formed in a spherical shape, the junction with the inner wall of the cylindrical tank leg 20 has an acute angle, and the outer peripheral end surface 22a of the end plate heat insulator 22 can be press-fitted, so that the end plate can be easily assembled. The holding structure of the tool 22 is provided. Note that the end plate insulator 22 is not limited to the circular shape as shown in FIG. 8 as long as the outer dimension is larger than the inner diameter of the cylindrical tank leg 20.

  The base heat insulator 23 (second heat insulator) is fixed by bolts between the cylindrical tank legs 20 and the L-shaped tank legs 21 and the base plate 12b (see FIG. 6). For example, as shown in FIG. It is formed in a ring shape. The base heat insulator 23 prevents heat radiation from the L-shaped tank legs 21 and the cylindrical tank legs 20 to the base plate 12b. The base heat insulator 23 is not limited to the shape as shown in FIG. 9 as long as it can hold the one side 21a of the L-shaped tank leg 21 and the end surface 20a of the cylindrical tank leg 20.

  In addition, the base heat insulator 23 is made of a material such as rubber that has not only heat insulation properties (heat insulation properties) but also elasticity and insulation properties, thereby reducing vibrations during transportation and operation of the indoor unit 30. Can be made. Furthermore, the electrolytic corrosion that occurs when the base plate 12b and the L-shaped tank legs 21 or the cylindrical tank legs 20 are made of different metal materials can be prevented, and sufficient strength can be maintained even during long-term use. Electrolytic corrosion means that when a dissimilar metal comes into contact and is immersed in a conductive liquid, a low potential metal becomes positive and a high potential metal becomes negative. It is a phenomenon.

  As described above, according to the embodiment, the lower end plate 7b of the hot water storage tank 7 is provided with the metal cylindrical tank leg 20 having the opening facing the lower end plate 7b, and the outer periphery of the cylindrical tank leg 20 is further provided. A plurality of metal L-shaped tank legs 21 having one side 21a extending outward in the circumferential direction are provided on the surface, and the cylindrical tank legs 20 and the L-shaped tank legs 21 are insulated and elastic base heat insulator 23. And is fixed to the base plate 12b.

  With this configuration, even when the hot water storage tank 7 is in a high-mass state, the load is distributed through the L-shaped tank legs 21, so that the installation state is stable and a highly practical hot water storage tank unit can be provided.

  Further, since the base heat insulator 23 is interposed between the cylindrical tank legs 20 and L-type tank legs 21 and the base plate 12b, the cylindrical tank legs 20, L-type tank legs 21 and the base plate 12b are different from each other. Even if it is made of metal, corrosion due to electric corrosion can be prevented, sufficient strength can be maintained even during long-term use, and safety is high and corrosion resistance is excellent.

  Further, the installation of the base heat insulator 23 can suppress heat radiation from the lower end plate 7 b of the hot water storage tank 7. Furthermore, since the lower end plate 7b located in the opening of the cylindrical tank leg 20 is covered with the end plate insulator 22, heat radiation from the lower end plate 7b of the hot water storage tank 7 to the base plate 12b can be suppressed. Therefore, it is possible to provide a hot water storage tank unit with improved heat insulation and high energy saving performance. In addition, since the installation of the end plate heat insulator 22 into the opening of the cylindrical tank leg 20 can be done manually, it is low in cost and easy to assemble.

  In addition, the base heat insulator 23 installed between the cylindrical tank leg 20 and the L-shaped tank leg 21 and the base plate 12b absorbs vibrations during transportation and operation, thereby causing damage to the hot water tank unit. It can be reduced, and the quietness during operation of the hot water storage tank unit can be improved.

  Further, the upper insulator 17 covers at least a part of the upper plate of the hot water storage tank 7 and the upper end plate 7 a, and the trunk plate insulator 16 covers the trunk plate between the lower end of the upper insulator 17 and the base insulator 23. Since it is made to cover, heat dissipation from the gap can be prevented.

  1 outdoor unit of air conditioner, 2 water / refrigerant heat exchanger, 3 pump, 4 booster heater, 5 expansion tank, 6 control device, 7 hot water storage tank, 7a upper end plate, 7b lower end plate, 8 indoor radiator, 9 three-way Valve, 10 Water supply piping, 11 Hot water piping, 12 Design panel, 12a Upper surface design panel, 12b Base plate, 13 Refrigerant piping, 14 Water piping, 16 Hot water tank body insulation, 17 Upper insulation, 18 Connecting hole, DESCRIPTION OF SYMBOLS 19 Connection band, 20 Cylindrical tank leg, 20a End surface of cylindrical tank leg, 21 L-type tank leg, 21a One side of L-type tank leg, 22 End plate heat insulator, 22a Outer end surface of end plate heat insulator, 23 Base heat insulator 30 Indoor unit of air conditioner, 71 Heat exchanger in tank.

Claims (5)

A hot water storage tank for storing hot water;
A metal first tank leg provided on the lower end plate of the hot water storage tank and having an opening on the lower side facing the lower end plate;
A first heat insulator installed to cover a lower end plate located in the opening of the first tank leg;
A second heat insulator having insulation provided between the first tank leg and the base plate,
The hot water storage tank unit, wherein the first heat insulator is press-fitted and fixed in an opening of the first tank leg. A plurality of circumferentially provided outer circumferential surfaces of the first tank legs, and a second tank leg made of metal that extends outward on one side;
The first tank leg is formed in a cylindrical shape,
The second tank leg is formed in an L shape, and the other side so that one side extending outward from the outer peripheral surface of the first tank leg is flush with the lower end surface of the first tank leg. The hot water storage tank unit according to claim 1, wherein the side is fixed to the outer peripheral surface of the first tank leg.   The hot water storage tank unit according to claim 1 or 2, wherein the first heat insulator is made of a non-woven fabric.   The hot water storage tank unit according to any one of claims 1 to 3, wherein the second heat insulator is made of a material having elasticity in addition to insulation. A third heat insulator mounted to cover at least a part of the upper portion of the body plate and the upper end plate of the hot water storage tank;
A fourth insulator wrapped around the remaining body plate excluding the upper part of the body plate of the hot water storage tank,
The said 4th heat insulation tool has covered the said trunk | drum from the lower end of the said 3rd heat insulation material to the said 2nd heat insulation material, The Claim 1 characterized by the above-mentioned. Hot water storage tank unit.

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