JP6047081B2 - Thermal insulation structure of hot water storage tank - Google Patents

Description

  The present invention relates to a heat insulating material structure of a hot water storage tank provided with a vacuum heat insulating material for heat insulation and heat insulation of a hot water storage tank of an electric water heater or a heat pump type hot water heater.

Conventionally, in order to improve the heat insulation performance and make the equipment compact, this type of thing keeps the periphery of the hot water storage tank with a foam heat insulating material or a vacuum heat insulating material according to its use. In some cases, a thin vacuum insulating material having a high heat insulating effect is used so as to cover the central cylindrical portion of the hot water storage tank. (See Patent Document 1.)
Further, as shown in FIG. 4, a vacuum heat insulating material 26 is provided around the central portion of the cylindrical hot water storage tank 7, and a foam heat insulating material 30 is provided on the upper surface and the bottom surface of the complicated hot water storage tank 7 to which connection pipes are attached. There is something used. The vacuum heat insulating material 26 has a core material 27 disposed between two front and back film-shaped covering materials 28, and the inside is sealed to a low vacuum. The vacuum heat insulating material 26 has an outer periphery in the thickness direction of the vacuum heat insulating material. An outer edge 29 for welding the covering material 28 is provided at substantially the center, and the outer edge 29 is fixed to the circumferential outer surface of the foam heat insulating material 30 by an adhesive tape 33.

Japanese Patent No. 4254902

By the way, in this prior art, the joint between the foam heat insulating material 30 and the vacuum heat insulating material 26 is fixed with the adhesive tape 33 in a state where the outer edge 29 of the columnar vacuum heat insulating material 26 is covered with the foam heat insulating material end 31. In addition, the outer edge 29 is bent twice so that the efficiency of the mounting operation is lowered.
In addition, since the vacuum heat insulating material 26 is originally used by winding a plate-like material in a cylindrical shape, the outer edge 29 is pulled in the circumferential direction by the mounting operation, so that the outer edge 29 is likely to be wrinkled. There was a problem that a gap was generated between the foam heat insulating material 30 and the vacuum heat insulating material 26 and the heat insulating performance was lowered.

  In order to solve the above-mentioned problems, the present invention has, in particular, a configuration in which a hot water storage tank for storing hot water heated by a heating means, an outer case surrounding the hot water storage tank, and between the hot water storage tank and the outer case A vacuum heat insulating material for heat insulation of the hot water storage tank is provided in a space facing the side surface of the hot water storage tank, and a foam heat insulating material is provided in a space facing the upper surface side and the bottom surface side of the hot water storage tank. A core material is arranged between two front and back film-like covering materials, and the inside is sealed in a low vacuum, and the covering material is welded to the vacuum heat insulating material outer periphery at the approximate center in the thickness direction of the vacuum heat insulating material. An outer edge is provided, the thickness of the foam heat insulating material end is less than half of the thickness of the vacuum heat insulating material, and an inclined surface is provided in the direction facing the center of the foam heat insulating material from the end of the foam heat insulating material and facing the hot water storage tank. Of the hot water storage tank and the inclined surface A space is formed, in which the outer edge in the space and be fixed to the hot water storage tank at the pressure-sensitive adhesive tape.

  As described above, according to the present invention, the vacuum heat insulating material that is easily damaged can be easily fixed to the wall surface of the hot water storage tank with the adhesive tape without bending the outer edge, so that the working efficiency can be improved. In addition, since there is no wrinkle at the outer edge of the vacuum heat insulating material, there is no gap between the foam heat insulating material and the vacuum heat insulating material. It can be used and is extremely convenient.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot water storage type water heater which shows one Embodiment with which the heat insulation structure of this invention is given. Explanatory drawing which shows the heat insulation structure of a hot water storage tank. The expanded sectional view of the principal part. The expanded sectional view of a prior art example.

Next, an embodiment of the present invention will be described with reference to the drawings.
1 is an exterior case constituting a hot water storage tank unit, 2 is a heating means comprising a heat pump unit, 3 is a hot water tap, 4 is a remote controller, 5 is a bathtub, and 6 is a power source.

  In the exterior case 1, a hot water storage tank 7 for storing hot water, a hot water pipe 8 connected to the upper part of the hot water storage tank 7, a water supply pipe 9 connected to the lower part of the hot water storage tank 7, and the hot water pipe 8 A mixing valve 11 for mixing high-temperature water and low-temperature water from the bypass pipe 10 branched from the water supply pipe 9, a hot water supply pipe 12 connected downstream of the mixing valve 11, and a hot water supply temperature sensor provided in the hot water supply pipe 12 13, a hot water flow rate sensor 14 provided in the hot water supply pipe 11, a hot water temperature sensor 15 provided in the water supply pipe 9, a hot water pipe 16 branched from the hot water pipe 12 and connected to the bathtub 5, and this hot water filling An overpressure relief that releases the overpressure of the hot water storage tank 7 that is branched from the hot water pipe 8 and connected to the hot water flow rate sensor 18 that integrates the flow rate flowing through the hot water pipe 16. Provided in the valve 19 and the water supply pipe 9 A hot water supply control mainly composed of a pressure reducing valve 20 for reducing the water supply pressure, a plurality of hot water storage temperature sensors 21 provided in the vertical direction of the side surface of the hot water storage tank 7, and a microcomputer for controlling various devices in the exterior case 1. The unit 22 is configured to include a heating circulation circuit 25 including a heat pump forward pipe 23 and a heat pump return pipe 24 for circulating hot water by connecting the hot water storage tank 7 and the heating means 2.

  Reference numeral 26 denotes a vacuum-sealed vacuum heat insulating material between the hot water storage tank 7 and the outer case 1 that covers almost the entire surface of the outer center of the hot water storage tank 7, and a covering material made of a large transparent film around the entire circumference of the core material 27. 28. The vacuum heat insulating material 26 is arranged in the thickness direction of the vacuum heat insulating material 26 on the outer periphery of the vacuum heat insulating material 26 after the core material 27 is disposed between the two film-like covering materials 28 formed on the front and back surfaces and the inside is sealed to a low vacuum. An outer edge 29 for welding the covering material 28 is provided substantially at the center.

  Reference numeral 30 denotes a foam heat insulating material, which is provided between the outer case 1 so as to cover the upper surface and the bottom surface of the hot water storage tank 7 having a complicated shape because a connection pipe or the like is attached. The end 31 of the foam heat insulating material 30 has a thickness that matches the position of the outer edge 29 of the vacuum heat insulating material 26 so that the connection to the vacuum heat insulating material 26 is simple and reliable. The inclined surface 32 and the hot water storage tank 7 are provided at a thickness of ½ or less of the thickness and provided with an inclined surface 32 in the direction from the end portion 31 to the center of the foam heat insulating material 30 and facing the hot water storage tank 7. A substantially triangular space 33 surrounded by the upper surface of the vacuum heat insulating material 26 is formed. The space 33 allows the outer edge 29 of the vacuum heat insulating material 26 to be smoothly affixed and fixed to the surface of the hot water storage tank 7 with the adhesive tape 34 without bending the outer edge 29, so that the working efficiency can be improved. . Further, since no wrinkle is generated at the outer edge 29 of the vacuum heat insulating material 26, no gap is generated between the foam heat insulating material 30 and the vacuum heat insulating material 26, so that higher heat insulating performance can be achieved, and the hot water storage tank 7 has a long time. Hot water can be kept at a high temperature.

  The heating means 2 includes a compressor 35 for compressing carbon dioxide refrigerant, a refrigerant water heat exchanger 36 as a condenser, a decompressor 37, a heat pump circuit 39 including an air heat exchanger 38 as an evaporator, air A blower 40 for blowing air to the heat exchanger 38, a variable capacity circulation pump 41 provided in the middle of the heating circulation circuit 25, and a refrigerant water heat exchanger 36 provided on the inlet side of the refrigerant water heat exchanger 36 in the heating circulation circuit 25. A heat exchange inlet temperature sensor 42 for detecting the temperature of hot water flowing into the water 36 and a refrigerant water heat exchanger 36 outlet side of the heating circuit 25 and detecting the temperature of hot water flowing out of the refrigerant water heat exchanger 36. A heat exchange outlet temperature sensor 43 and a heating control unit 44 mainly composed of a microcomputer for controlling the heating means 2 are configured.

  Here, the power source 6 is an electric lamp according to the time zone, and is set at a low price for power charges at night (from 23:00 to 7:00 here). It heats up the amount of hot water needed for the day and uses it in the daytime (from 7:00 to 23:00) with this hourly light. When the remaining amount of hot water decreases, additional boiling An increase is made. The power source 6 is connected to the hot water supply control unit 22, and power is supplied from the hot water supply control unit 22 to the remote controller 4 and the heating control unit 44 by superimposing communication signals in a wired manner.

  When the night time zone is reached, the hot water supply control unit 22 calculates the amount of stored hot water necessary for the next day, and instructs the heating control unit 44 to boil up the target hot water storage amount by the end of the night time zone. The circuit 39 is activated to start driving the circulation pump 41 of the heating circulation circuit 25. Then, the hot water taken out from the lower part of the hot water storage tank 7 by driving the circulation pump 41 flows into the refrigerant water heat exchanger 36 of the heating means 2 through the heat pump forward pipe 23 and is heated and is heated via the heat pump return pipe 24. The hot water is stored by being returned to the upper part of 7.

  Furthermore, when the hot water storage temperature sensor 21 provided on the side surface of the hot water storage tank 7 detects that a predetermined amount of high temperature water has been stored, or the heat exchange inlet temperature sensor 42 detects a predetermined temperature or higher, a hot water supply control unit 22 instructs the heating control unit 44 to stop the heating operation, the operation of the heat pump circuit 39 and the circulation pump 41 is stopped, and the hot water storage operation is completed by the end of the night time zone.

  Here, the amount of heat stored in the hot water storage tank 7 is calculated by the hot water supply control unit 22 as a target amount of heat stored in the hot water supply load for the past several days. Varies in the range of 60 ° C. to 90 ° C. depending on the season (or the feed water temperature detected by the feed water temperature sensor 15) and the target hot water storage heat amount.

  The remote controller 4 includes a temperature setting switch 45 for setting a hot water supply set temperature, a hot water filling switch 46 for instructing the hot water filling to the bathtub 5, a hot water filling amount setting switch 47 for setting the hot water filling amount, and a remaining hot water supply available. An operation unit 49 having a remaining time display switch 48 for displaying time, a display unit 50 made of a dot matrix type fluorescent display tube, the operation unit 49 and the display unit 50 are controlled, and the hot water supply control unit 22 is controlled. The remote control unit 51 is mainly configured with a microcomputer that communicates with the hot water supply temperature and time information set by the operation unit 49 in the display unit 50 and the hot water storage temperature sensor 21 during normal operation. The remaining hot water storage amount to be displayed is displayed. The display unit 50 may be a dot matrix type liquid crystal display unit.

  Next, when the hot-water tap 3 is opened, the hot water in the upper part of the hot water storage tank 7 is pushed out to the hot water discharge pipe 8 by the water supply pressure from the water supply pipe 9, and the mixing pipe 11 controlled by the hot water supply control unit 22 The temperature detected by the low-temperature water and the hot water supply temperature sensor 13 is mixed so as to be the hot water supply set temperature set by the operation unit 49 of the remote controller 4, and hot water is supplied through the hot water supply pipe 12.

  If the amount of hot water supply becomes larger than usual, the hot water supply control unit 22 detects that the remaining hot water storage amount detected by the hot water storage temperature sensor 21 has decreased during the daytime power hours, and the hot water is stored in the hot water storage tank 7. When hot water is expected to run out, the necessary amount of heat is increased using the daytime power at that time.

  Next, when filling the bathtub 5, when the filling switch 46 of the remote controller 4 is operated, the hot water supply control unit 22 opens the filling valve 17 to start filling, and starts filling. When it is detected that the integrated flow rate from has reached the amount of hot water filling, the hot water filling valve 17 is closed to complete the hot water filling.

  Next, the heat insulating material is assembled by winding the vacuum heat insulating material 26 around a predetermined position around the center of the hot water storage tank 7 and smoothly sticking the outer edge 29 of the vacuum heat insulating material 26 to the surface of the hot water storage tank 7 with an adhesive tape 34. If the foam heat insulating material 30 is attached to the upper surface and the bottom surface of the hot water storage tank 7, the adhesive tape 34 affixed portion of the outer edge 29 of the vacuum heat insulating material 26 fits in the space 33.

  By assembling the vacuum heat insulating material 26, the vacuum heat insulating material 26 which is easily damaged can be easily fixed to the hot water storage tank 7 with the adhesive tape 34 without forcibly bending the outer edge 29, so that the work efficiency can be improved. . Further, since the outer edge 29 of the vacuum heat insulating material 26 is not stretched in the circumferential direction, and the outer edge 29 of the vacuum heat insulating material 26 is not wrinkled, a gap is generated between the foam heat insulating material 30 and the vacuum heat insulating material 26. Therefore, it is possible to achieve higher heat insulation performance, to maintain the hot water in the hot water storage tank 7 at a high temperature for a long time, and it is extremely easy to use and always provides a good hot water storage.

DESCRIPTION OF SYMBOLS 1 Exterior case 2 Heating means 7 Hot water storage tank 26 Vacuum heat insulating material 28 Cover material 29 Outer edge 30 Foam heat insulating material 31 End part 32 Inclined surface 33 Space 34 Adhesive tape

Claims (1)

  A hot water storage tank for storing hot water heated by the heating means, an outer case surrounding the hot water storage tank, and a vacuum that insulates the hot water storage tank in a space facing the side of the hot water storage tank between the hot water storage tank and the outer case. In the case where a heat insulating material is provided with a foam heat insulating material in a space facing the upper surface side and the bottom surface side of the hot water storage tank, the vacuum heat insulating material has a core material disposed between two film-like covering materials. The inside of the vacuum heat insulating material is sealed at a low vacuum, and the outer periphery of the vacuum heat insulating material is provided with an outer edge for welding a covering material at the substantially center in the thickness direction of the vacuum heat insulating material. And forming a space between the hot water storage tank and the inclined surface by providing an inclined surface in a direction opposite to the hot water storage tank from the end of the foamed heat insulating material to the center of the foamed heat insulating material, Adhesive tape around the outer edge in the space Insulation material structure of the hot water storage tank to be fixed to the hot water tank.

Images