JP2017089952A - Hot water storage tank unit and hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems that a heat insulating material made of resin foam, improves heat insulation effect of the heat insulating material surrounding the circumference of a hot water storage tank, and is improved in heat insulating performance in accordance with increase of its thickness dimension, but as an accommodation space in a hot water storage tank unit is limited, the thickness of the foamed heat insulating material is also limited, and in a case when a vacuum heat insulating material is used, heat retaining performance is improved, but manufacturing costs is increased.SOLUTION: A hot water storage tank unit has a hot water storage tank disposed in the hot water storage tank unit, and a heat insulating material covering the circumference of the hot water storage tank while combining a plurality of heat insulating structures, and further includes a heat shielding sheet covering the circumference of the heat insulating material.SELECTED DRAWING: Figure 2

Description

  Embodiments of the present invention relate to, for example, a hot water storage tank unit and a hot water supply device including the same.

As an electric hot water supply device such as a heat pump water heater, there is known a device that uses cheap electric power at night to boil hot water, stores the boiled hot water in a hot water storage tank, and uses it in the daytime.
For this reason, the hot water storage tank is required to have high heat insulation properties, and a general hot water storage tank has a configuration in which the outer shell is surrounded by a heat insulating material.
As the heat insulating material, a heat insulating material made of foamed resin by a bead foaming method is widely used, and it is formed by placing foamed beads in a mold and heating and foaming. The heat retaining property of the heat insulating material increases as the thickness of the heat insulating material increases.
Moreover, a vacuum heat insulating material is used when higher heat retention is required.

However, the heat insulating material made of foamed resin improves the heat insulating performance as the wall thickness increases, but the storage space in the hot water storage tank unit is limited, and the thickness of the foamed heat insulating material is also limited.
Also, when using vacuum heat insulating material, the vacuum heat insulating material itself is very expensive and at the same time the performance degradation due to damage is so significant that it is difficult to mount it on a curved surface such as a hot water tank. The cost of will become high.

JP 2008-309390 A

  An object of an embodiment of the present invention is to provide a hot water storage tank unit that is inexpensive and can improve the heat retention of the hot water storage tank.

The hot water storage tank unit of the embodiment includes a hot water storage tank, a heat insulating material that covers the periphery of the hot water storage tank by combining a plurality of structures, and a heat shield sheet that covers at least the upper portion of the heat insulating material.
Moreover, it is a hot water supply apparatus provided with the hot water storage tank unit which has such a structure.

It is a figure showing the system outline of the heat pump water heater of a 1st embodiment. It is a disassembled perspective view which shows the state which removed the heat insulating material of the hot water storage tank unit of 1st Embodiment. It is a perspective view which shows the state which removed the housing | casing of the hot water storage tank unit of 1st Embodiment. It is a perspective view which shows the state which removed the bag-shaped heat insulation sheet | seat of the hot water storage tank unit of 3rd Embodiment.

(First embodiment)
A system outline of a heat pump water heater 100 as a hot water supply apparatus of the first embodiment will be described with reference to FIG.
The heat pump water heater 100 includes a heat pump unit 1 and a hot water storage tank unit 2, which are connected by an outward piping 61 and a backward piping 62.

  The heat pump unit 1 includes, for example, a compressor 40 that compresses a refrigerant in a housing, a water-refrigerant heat exchanger 41 that heats water supplied by the compressed refrigerant, an expansion valve 43 for expanding the refrigerant, a refrigerant and outside air. A refrigerant-air heat exchanger 44 for exchanging heat is connected, and these are sequentially connected by a refrigerant pipe to constitute a refrigeration cycle in which carbon dioxide refrigerant is enclosed. A blower 45 is provided in the vicinity of the refrigerant-air heat exchanger 44 so as to promote heat exchange between the refrigerant and air. Further, an internal heat exchanger 42 for exchanging heat between the refrigerant on the upstream side of the compressor 40 and the refrigerant on the downstream side of the water-refrigerant heat exchanger 41 is also provided.

  In the hot water storage tank unit 2, a hot water storage tank 3 having a low temperature side tank can body 3a and a high temperature side tank can body 3b is provided. The low temperature side tank can body 3a and the high temperature side tank can body 3b are formed in a vertically long cylindrical shape having substantially the same shape, and hot water pipes are connected to the upper portion and the lower portion, respectively. The low temperature side tank can body 3a and the high temperature side tank can body 3b are covered with heat insulating materials for keeping the hot water stored. Further, a plurality of temperature sensors 58 for detecting the temperature of the hot water in the interior are provided on the side surfaces of the low temperature side tank can body 3a and the high temperature side tank tube body 3b, respectively, and are arranged at predetermined intervals in the vertical direction. Has been. These temperature sensors 58 can measure the vertical temperature distribution in the tank can.

  In the hot water storage tank unit 2, in addition to the forward pipe 61 and the return pipe 62, a water supply pipe 63 for supplying water from the water supply, a use side hot water supply pipe 64 connected to a use side currant such as a bathroom or kitchen, and hot water supply to the bathtub There are provided a bath hot water supply pipe 65 for performing and a bath return pipe 66 for supplying hot water from the bathtub to the additional heat exchanger 51. Moreover, it has the connection part for connecting with these hot and cold water piping, and these connection parts are gathered and arrange | positioned at the waterway components attachment board 9 mentioned later.

The connecting portion of the water supply pipe 63 is connected to the lower portion of the low temperature side tank can body 3b via the pressure reducing valve 54, and the upper portion of the low temperature side tank can body 3a is connected to the lower portion of the high temperature side tank can body 3b via the hot water pipe. It is connected. Thereby, the water supplied to the low temperature side tank can body 3a is sequentially supplied to the lower part of the high temperature side tank can body 3b.
In addition, the lower side of the low temperature side tank can body 3a is connected to the connecting portion of the forward piping 61, and the connection portion of the return piping 62 is connected to the upper portion of the high temperature side tank can body 3b.

In the state of use after installation, water is continuously supplied to the lower part of the low temperature side tank can body 11a connected to the water supply pipe at the tap pressure reduced by the pressure reducing valve 54.
When the water in the hot water storage tank 3 is boiled, the boiling circulation pump 53 provided on the piping path is operated, and the water stored in the lower portion of the tank can 3a is transferred to the heat pump unit 1 via the forward piping 61. To the water-refrigerant heat exchanger 41. At this time, water is boiled up to hot hot water of about 90 ° C. by the high-temperature and high-pressure carbon dioxide refrigerant sent by the operation of the compressor 40 of the heat pump unit 1. The boiled hot water is supplied to the upper portion of the tank can body 3b through the return pipe 62.

Thereby, hot water is sequentially stored from above the tank can body 3b, and when a predetermined amount of hot water is stored, the operation of the heat pump unit 1 is completed and the hot water storage operation is completed.
The hot water storage operation is performed, for example, at an inexpensive nighttime for electricity bills, and then the hot water is kept in the hot water storage tank 3 until the hot water is used.

  In the hot water storage tank unit 2, an electric component box 10 which is a metal box for storing a control board and the like is stored. The temperature sensor 58 and other various sensors are connected to the electrical component box 10 to collect the operation status and outside air information of the heat pump water heater 100, and based on the operation settings input from a remote controller (not shown), etc. The refrigeration cycle is operated, and the operation of the mixing valves and pumps is performed in accordance with operations such as hot water extraction and re-cooking.

Next, the internal structure of the hot water tank unit 2 will be described with reference to FIGS.
FIG. 2 is a view showing a state in which the hot water storage tank 3 provided in the hot water storage tank unit 2 and the heat insulating materials covering the periphery thereof are removed, and FIG. 3 shows an upper panel 20a and a front panel of the casing 20 of the hot water storage tank unit 2. It is a figure which shows the state which removed 20b, the right side panel 20c, and the left side panel 20d.

  The hot water storage tank 3 is arranged above the bottom plate 7 having a plurality of fixed legs 8 in the order of a low temperature side tank can body 3a and a high temperature side tank can body 3b in the front-rear direction. The low temperature side tank can body 3a and the high temperature side tank can body 3b are substantially entirely made of a foam heat insulating material 11 configured by combining an upper heat insulating material 11a, a right heat insulating material 11b, a left heat insulating material 11c, and a lower heat insulating material 11d. The surrounding area is covered.

  Each member of the foam heat insulating material 11 is formed in a three-dimensional structure made of foamed resin formed by placing porous foam beads such as polyurethane, polystyrene, polyethylene, and polypropylene in a mold and heating and foaming. This is a structural heat insulating member.

  The right heat insulating material 11b and the left heat insulating material 11c are formed in a half-cylindrical shape that covers the left and right side surfaces of the two tank can bodies of the hot water storage tank 3, and the right heat insulating material 11b and the left heat insulating material 11c. Two substantially cylindrical shapes are arranged in the front-rear direction by abutting and engaging the heat insulating material 11c.

The right heat insulating material 11b and the left heat insulating material 11c are provided with through holes (not shown) for enabling the wiring of a plurality of temperature sensors 58 provided on the side surface of the hot water storage tank 3 to be drawn out.
The upper heat insulating material 11a is formed in a bowl shape that engages with the upper shape of the two tank can bodies, and the upper end surface of the right heat insulating material 11b and the left heat insulating material 11c and the lower end surface of the upper heat insulating material 11a. It has a shape that contacts and engages.

  Further, a through hole for communicating piping connected to the hot water storage tank 3 is provided at the upper end portion of the upper heat insulating material 11a, and a lid cover made of foamed resin (not shown) is attached to the through hole, and the hot water storage tank 3 Covers the top.

The lower heat insulating material 11d is formed in a bowl shape that engages with the lower shape of the two tank can bodies, and is in contact with and engages with the lower end surfaces of the right heat insulating material 11b and the left heat insulating material 11c. Yes.
In addition, the lower heat insulating material 11 d is provided with a through hole for communicating piping connected to the hot water storage tank 3 and a through hole for communicating a leg portion supporting the hot water storage tank 3.

  Further, the foamed heat insulating material 11 around the high temperature side tank can body 3 b is further covered with a heat shield sheet 15. The heat shield sheet 15 is, for example, a substantially rectangular aluminum heat shield sheet in which an aluminum thin film is welded to a polyester film having a low air permeability. The heat shield sheet 15 is coated so as to cover the rear left and right side surfaces and the upper surface of the foam heat insulating material 11. Yes. In other words, the high temperature hot water storage tank 3b is covered so as to cover the periphery of the upper part. Further, the heat shield sheet 15 is bent in accordance with the unevenness and curved surface shape of the upper foam heat insulating material 11a, and at the same time, the central portion is opened to connect the pipe connected to the upper part of the high temperature side tank can body 11b and the communication hole is opened. 15a is formed.

In addition, the heat shield sheet 15 is provided with a communication hole (not shown) for communicating a wire drawn from a temperature sensor 58 provided on the side surface of the hot water storage tank 3.
The heat shield sheet 15 can be easily cut and bonded, provided with a communication hole for communicating the pipes and wirings, and further partially covered with the heat shield sheet of the same material from the upper part. it can.

On the front surface of the foam insulation 11, irregularities for fixing various components of the hot water piping path such as the additional cooking heat exchanger 51, the mixing valve, the additional cooking circulation pump 52, and the boiling circulation pump 53 and the electrical component box 10. As shown in FIG. 3, each functional component is arranged.
In addition, functional parts such as a bath circulation pump 52, a boiling circulation pump 53, and a mixing valve thereof are collectively arranged on the front surface of the foam heat insulating material 11. And the connection part of the piping connected to these functional parts is concentrated on the water channel part mounting plate 9 disposed below the front surface of the hot water storage tank unit 3, and the piping connection work at the time of installation is easily performed. Be able to.

  Further, the front panel 20b of the casing 20 of the hot water tank unit 2 is provided with windows 21a and 21b, and the display unit provided in the electric component box 10 can be visually recognized without removing the front panel 20b. An open / close plug provided in the pipe can be operated.

  As described above, by covering the outer periphery of the foam heat insulating material 11 with the heat shield sheet 15, not only heat conduction by contact but also release of heat energy by radiant heat by infrared rays (electromagnetic waves) can be suppressed, and high heat insulation and heat shield. Performance can be obtained.

  As for radiant heat, it is known that a heat source of about 100 ° C. emits infrared light having a peak in the vicinity of a wavelength of 5 μm according to Planck's law. This infrared frequency is close to the resonance frequency of materials composed of C, H, and O bonds that form plastics, paints, fibers, wood, etc., and these materials are converted into thermal energy as molecular vibrations. , Which causes a rise in temperature.

  However, since the foamed resin heat insulating material used as a general heat insulating material for hot water storage tanks is porous and contains a lot of air, it hardly absorbs infrared rays, and most of it is transmitted.

  Therefore, by arranging the heat shield sheet 15 made of aluminum material or the like on the outer peripheral surface of the foam resin heat insulating material, the infrared rays transmitted through the foam resin material are reflected by the surface of the heat shield sheet 15 and radiated outside the hot water storage tank unit 2. It is possible to suppress divergence.

  If there are free electrons on the surface that is exposed to electromagnetic waves, such as the aluminum metal surface, the electrons resonate with the frequency of the electromagnetic waves and vibrate, and this causes the phenomenon of reflection by emitting electromagnetic waves of the same frequency. Since the reflectance on the glossy aluminum surface free from rust and defects in the infrared region is 90% or more, the outflow of thermal energy as radiant heat can be suppressed.

The heat shielding sheet 15 reflects infrared rays emitted from the tank can body and transmitted through the foam heat insulating material, and is released to the outside of the hot water storage tank unit 2, thereby suppressing the loss of heat energy.
In addition, by covering the surface of the tank can body with a foam heat insulating material and further covering the surface with a heat insulating sheet, heat release due to heat conduction and radiation can be efficiently suppressed.

  Further, by covering the upper part of the hot water storage tank 11 with a heat shield sheet, even if a heat insulating structure using a foam heat insulating material combining a plurality of structures is used, a tank can is formed from a gap such as a joint of the foam heat insulating material. The air coming into contact with the body rises and the flow of air toward the upper side of the tank can be blocked, and the release of heat energy due to the convection of air can be suppressed.

Further, the thickness of the foam heat insulating material 11 has a thickness that can cut off heat conduction from the surface of the tank tube body to the heat shield sheet 15, thereby heating the heat shield sheet 15 itself, Infrared rays are not emitted from the heat shield sheet 15 itself.
That is, by disposing the heat shield sheet 15 on the outer peripheral surface of the foam heat insulating material 11, not between the hot water storage tank 3 and the foam heat insulating material 11, there is almost no heat conduction to the heat shield sheet 15 due to contact, and the heat shield. Since radiant heat is not emitted from the sheet 15 itself, higher heat insulation and heat shielding performance can be ensured.

  In particular, the foaming heat insulating material 11 has a foaming ratio of 30 to 60 times, an average thickness of 20 mm to 50 mm, and 30% or more of the surface area of the foaming heat insulating material is covered with a heat insulating sheet, thereby providing high heat insulating and heat insulating performance. Can be obtained.

Moreover, favorable heat insulation performance and manufacturability can be reconciled by making the thickness of the foam heat insulating material 11 into the range of the minimum value 10 mm and the maximum value 60 mm.
Moreover, by setting the film thickness of the heat shield sheet 15 covering the foam heat insulating material 11 to 0.1 mm to 0.4 mm and the tensile strength to 500 kg / m ^ 2, good heat shield / heat insulation performance can be obtained at the same time. Even if the foamed heat insulating material 11 is formed in a three-dimensional structure with a square shape, the heat shield sheet 15 is not easily torn, and the covering and assembling work at the time of manufacture can be easily performed.

By using the heat shield sheet 15 as described above, even if the surface of the foam heat insulating material 11 is a three-dimensional structure having a curved surface or an uneven shape, a necessary portion can be easily covered.
In addition, by adopting a configuration that covers a separate sheet from the foam insulation 11 such as the heat shield sheet 15, it can be applied even if the sheet is accidentally damaged during manufacturing, installation, or other maintenance. Repair such as replacement is easy, and high heat insulation and heat insulation performance can be maintained.

  Further, even if some scratches or holes are generated, the heat insulation performance is not significantly lowered unlike the vacuum heat insulating material, so that the hot water storage tank unit 2 with high reliability can be obtained.

By using the hot water storage tank unit 2 as described above for the heat pump water heater 100, even in a system in which the heat pump unit 1 is operated at night when electricity charges are low and hot water of about 90 ° C. is stored in the hot water storage tank 11. Less heat energy is lost from the operation to the point of using hot water, the frequency of re-boiling operation due to running out of hot water can be reduced, and a hot water supply device with low power consumption can be obtained.
Moreover, it is easy to manufacture and it can be set as the reliable hot-water supply apparatus.

(Second Embodiment)
The hot water storage tank unit 2 of the second embodiment will be described.
In the first embodiment, the outer peripheral surface of the foam heat insulating material 11 on the high temperature side tank can body 3b side of the hot water storage tank 3 is covered with the heat shield sheet 15, but in the second embodiment, the low temperature side tank can body 3a. And you may make it cover the foam insulation 11 whole containing the high temperature side tank can body 3b. Accordingly, piping parts such as the electric component box 10 and the mixing valve are installed on the outer surface of the heat shield sheet 15 that covers the outer peripheral surface of the foam heat insulating material 11.

By covering the entire hot water storage tank 3 with the heat shield sheet 15 in this way, a hot water storage tank unit with higher heat shield and heat insulation performance can be obtained, and at the same time, the electrical component box 10 and the piping parts are provided on the heat shield sheet. By arranging the types, it is possible to easily perform the part assembling work, and it is possible to easily check the display unit and perform repair / replacement work at the time of maintenance.
In addition, since the heat shield sheet 15 is formed into a sheet shape that can be easily bent and curved, it can be easily covered with a shape that matches the concavo-convex portion for locking the electric component box 10 and the like.

  In addition, even when some holes are formed in the heat shield sheet 15, the performance is not significantly deteriorated. Therefore, even when a screw is driven into the foam heat insulating material 11 from the outer peripheral side of the heat shield sheet 15, a good shield is provided. Heat and heat insulation performance can be maintained. For example, when the electric component box 10 is screwed to the foam heat insulating material, it may be fixed by screwing from the outer peripheral surface side of the heat shield sheet 15.

(Third embodiment)
A hot water storage tank unit 5 according to a third embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same component as the component demonstrated in 1st Embodiment, and the overlapping description is abbreviate | omitted.

  Similar to the hot water storage tank unit 2 of the first embodiment, the hot water storage tank unit 5 includes a hot water storage tank 3 that is connected to the heat pump unit 1 by hot water piping and stores hot water. The internal structure of the hot water storage tank unit 5 is also substantially the same. have.

  As a different configuration from the hot water storage tank unit of the first embodiment, the foamed heat insulating material 11 covering the hot water storage tank 3 is covered with a bag-shaped bag-shaped heat shield sheet 30 that opens downward.

  The bag-shaped heat shield sheet 15 is an aluminum heat shield sheet of the same quality as the heat shield sheet 15 of the first embodiment, and is formed in a substantially bag shape having an opening at the bottom and a closure at the top. As shown in FIG. 4, when manufacturing the hot water storage tank unit 5, the foam heat insulating material 11 is attached to the hot water storage tank 3, and the bag-shaped heat shield sheet 30 formed in a bag shape is covered from the upper part. The entire hot water storage tank 3 can be covered. Furthermore, by covering hot water piping connected to the upper part of the hot water storage tank 3, radiation heat radiation from hot water remaining in the piping can also be suppressed.

  Thirdly, in the bag-shaped radiation sheet 30 of the embodiment, it is possible to confirm the display from the outside by cutting out the parts facing the windows 21a, 21b provided on the front panel 20b of the electrical component box 10 or the housing 20. Operation is possible.

In the first to third embodiments, the case where one can is covered with four foamed heat insulating materials has been described as an example. However, two or more subdivided configurations may be used.
Moreover, although the said embodiment demonstrated the hot water storage tank which has two tank can bodies, it is good also as a hot water storage tank which has only one tank can body.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 100 ... Heat pump water heater, 1 ... Heat pump unit, 2 ... Hot water storage tank unit, 3 ... Hot water storage tank, 3a ... Low temperature side tank can body, 3b ... High temperature side tank can body, 7 ... Bottom plate, 8 ... Fixed leg, 9 ... Waterway Component mounting plate, 10 ... Electrical component box, 11 ... Foam insulation, 11a ... Upper foam insulation, 11b ... Right foam insulation, 11c ... Left foam insulation, 11d ... Lower foam insulation, 15 ... Heat insulation Sheet, 15a ... Communication hole, 20 ... Housing, 20a ... Top panel, 20b ... Front panel, 20c ... Right side panel, 20d ... Left side panel, 20e ... Back panel, 21a ... Window part, 21b ... Window part, 30 DESCRIPTION OF SYMBOLS ... Bag-shaped heat shield sheet, 40 ... Compressor, 41 ... Water-refrigerant heat exchanger, 42 ... Internal heat exchanger, 43 ... Expansion valve, 44 ... Refrigerant-air heat exchanger, 45 ... Blower, 51 ... Additional cooking Heat exchanger, 52 ... Bath circulation Pump, 53 ... Boiling circulation pump, 54 ... Pressure reducing valve, 58 ... Temperature sensor, 61 ... Outward piping, 62 ... Return piping, 63 ... Water supply pipe, 64 ... Hot water supply pipe, 65 ... Bath hot water supply pipe, 66 ... Bath return pipe

Claims (5)

A hot water storage tank,
A heat insulating material covering the periphery of the hot water storage tank by combining a plurality of structures;
A hot water storage tank unit comprising a heat shield sheet covering at least an upper portion of the heat insulating material. A hot water pipe connected to the upper part of the hot water storage tank;
The heat shield sheet that covers the upper part of the hot water storage tank is provided with a communication hole through which the hot water pipe communicates. The hot water storage tank unit according to claim 1.   The hot water storage tank unit according to any one of claims 1 to 2, wherein the heat shield sheet formed in a bag shape is covered and covered from above the hot water storage tank. An electrical component box provided on the outer surface side of the heat insulating material;
Provided in the electrical component box, comprising a display unit for displaying the operating state of the device,
4. The hot water storage tank unit according to claim 1, wherein the heat shield sheet covers an outer peripheral portion including the heat insulating material and the electric component box and has an opening facing the display unit. 5. .   A hot water supply apparatus comprising the hot water storage tank unit according to any one of claims 1 to 4.

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