JP2016217563A - Hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage type water heater including a heat insulation material in which a groove part is formed which can prevent a piping member from freezing and also which can prevent heat radiation of a hot water storage tank.SOLUTION: A hot water storage type water heater includes: a hot water storage tank 7 for storing hot water heated by heating means 2; an outer case 1 for surrounding the hot water storage tank 7; and a heat insulation material 26 for performing heat retention and heat insulation of the hot water storage tank 7 in a space between the hot water storage tank 7 and the outer case 1. Furthermore, on an outer peripheral wall of the heat insulation material 28a, a vertically long groove part 29 is provided for accommodating a piping member 30 connected to an upper part of the hot water storage tank 7 and extending downward. The thickness of the groove part 29 of the heat insulation material 28a is thick on the upper part side of the hot water storage tank 7 and thin on the lower part side.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a hot water storage type water heater provided with a hot water storage tank for storing hot water such as an electric water heater and a heat pump type hot water heater.

  Conventionally, in this type, a heat insulating material is provided between the hot water storage tank and the outer case, and a groove portion extending in the vertical direction is formed on the outer peripheral wall of the heat insulating material so that the piping member is held by the groove portion. Was. (For example, see Patent Document 1)

JP 2010-230191 A

  By the way, in this conventional thing, in order to prevent the freezing of the piping member hold | maintained in the groove part using the thermal radiation of the hot water stored in the hot water storage tank, the thickness of the heat insulating material which forms a groove part is made as thin as possible. However, it is necessary to obtain a large amount of heat dissipation, but conversely, if the heat dissipation proceeds, the original function of the heat insulating material is not fulfilled and the efficiency is lowered.

  This invention pays attention to this point and solves the above-mentioned drawbacks. In particular, the construction thereof includes a hot water storage tank for storing hot water heated by a heating means, an exterior case surrounding the hot water storage tank, and the hot water storage tank and the exterior case. Is provided with a heat insulating material for heat insulation and heat insulation of the hot water storage tank, and an outer peripheral wall of the heat insulating material is provided with a vertically long groove portion for connecting a pipe member connected to the upper portion of the hot water storage tank and extending downward. In this case, the thickness of the groove portion of the heat insulating material is such that the upper side of the hot water storage tank is thickened and the lower side is thinned.

  According to a second aspect of the present invention, the thickness of the groove portion of the heat insulating material is gradually reduced from the upper side to the lower side of the hot water storage tank.

  As described above, according to the present invention, it is possible to increase the plate thickness of the groove portion at the upper part of the hot water storage tank in which a lot of high-temperature water is stored, to suppress heat dissipation from the upper part of the hot water storage tank as much as possible, and to improve the efficiency. In addition, in the lower part of the hot water storage tank where a lot of low-temperature water is stored, the heat sink from the lower part of the hot water storage tank is strongly received in order to prevent the pipe member from freezing. By using the temperature difference between the upper and lower hot water storage tanks, the conflicting problems of suppressing heat dissipation and preventing freezing using heat dissipation are reliably solved.

  Further, as described in claim 2, if the thickness of the groove portion of the heat insulating material is gradually reduced from the upper side to the lower side of the hot water storage tank, it can be easily and inexpensively formed. It has an effect.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot water storage type water heater of one Embodiment of this invention. The disassembled perspective view of the heat insulating material. The side view of the heat insulating material. CC sectional view taken on the line of FIG. The DD sectional view taken on the line of FIG. The principal part expanded sectional view. The principal part expanded sectional view of other embodiment.

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 12, a water supply temperature sensor 15 provided in the water supply pipe 9, a hot water pipe 16 branched from the hot water supply 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 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 foam heat insulating material made of heat-resistant foamed polystyrene that covers and covers the entire outer surface of the hot water storage tank 7 between the hot water storage tank 7 and the outer case 1. The upper portion covers the upper part of the hot water storage tank 7. A heat insulating material 27 and a side heat insulating material 28 that covers the side surface that is the body portion of the hot water storage tank 7, and the side heat insulating material 28 is divided into front and rear side heat insulating materials 28 a and a side rear heat insulating material 28 b, which is a total of three parts. It is divided into two.

  Reference numeral 29 denotes a vertically long groove formed on the outer side wall of the front side heat insulating material 28a and accommodating the piping member 30 such as the hot water discharge pipe 8, the bypass pipe 10, the hot water supply pipe 12 or the heat-pump return pipe 24. The thickness of the groove 29 The thickness of the upper part of the hot water storage tank 7 is increased to prevent freezing of the piping member 30 which is accommodated by obtaining some heat dissipation while suppressing heat dissipation from the upper part of the hot water storage tank 7 where hot water is stored. The lower part of the hot water storage tank 7 is thinned to actively prevent the freezing of the piping member 30 that is received by receiving heat from the lower part of the hot water storage tank 7 in which relatively low temperature water is stored. No. 29 is changed in two steps, the depth from the center part in the height direction of the hot water storage tank 7 of the hot water storage tank 7 to the lower side and the depth to the remaining lower end so that the thickness is as described above. The piping member 30 to be stored is also the groove 2 Those that are to be accommodated naturally bent or is bent in two stages to be received into.

  The heating means 2 includes a compressor 31 for compressing carbon dioxide refrigerant, a refrigerant water heat exchanger 32 as a condenser, a decompressor 33, a heat pump circuit 35 including an air heat exchanger 34 as an evaporator, air A blower 36 for blowing air to the heat exchanger 34, a variable capacity circulation pump 37 provided in the middle of the heating circuit 25, and a refrigerant water heat exchanger provided on the inlet side of the refrigerant water heat exchanger 32 of the heating circuit 25. A heat exchange inlet temperature sensor 38 that detects the temperature of hot water flowing into the hot water 32 and a refrigerant water heat exchanger 32 outlet side of the heating circuit 25, and detects the temperature of hot water flowing out of the refrigerant water heat exchanger 32. A heat exchange outlet temperature sensor 39 and a heating control unit 40 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). The amount of stored hot water needed for the day is boiled and used, and the electric light is also supplied in the daytime (from 7 o'clock to 23 o'clock). Boiling is performed. 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 40 with a communication signal superimposed thereon in a wired manner.

When the night time zone is reached, the hot water supply control unit 22 calculates the heat storage heat amount necessary for the next day, and instructs the heating control unit 40 to boil up the target hot water storage amount by the end of the night time zone. The circuit 35 is operated, and the driving of the circulation pump 37 of the heating circulation circuit 25 is started. Then, the hot water taken out from the lower part of the hot water storage tank 7 by driving the circulation pump 37 flows into the refrigerant water heat exchanger 32 of the heating means 2 through the heat pump forward pipe 23 and is heated, and is heated through the heat pump return pipe 24. The hot water is stored by being returned to the upper part of 7.
Further, the heat-pump pipe 23 is not insulated from the foam heat insulating material 26, and COP is improved by not intentionally raising the temperature of the water supplied to the heating means 2.

  Further, when a 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 when the heat exchange inlet temperature sensor 38 detects a predetermined temperature or higher, a hot water supply control unit. 22 instructs the heating control unit 40 to stop the heating operation, the operation of the heat pump circuit 35 and the circulation pump 37 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 amount of target hot water stored.

  The remote controller 4 includes a temperature setting switch 41 for setting a hot water supply set temperature, a hot water filling switch 42 for instructing a hot water filling to the bathtub 5, a hot water filling amount setting switch 43 for setting a hot water filling amount, and a remaining time for hot water supply. An operation unit 45 having a remaining time display switch 44 for displaying the display, a display unit 46 formed of a dot matrix type fluorescent display tube, and controls the operation unit 45 and the display unit 46, and the hot water supply control unit 22. A remote control unit 47 mainly composed of a microcomputer for communication is provided. During normal operation, the display unit 46 detects the hot water supply set temperature and time information set by the operation unit 45 and the hot water storage temperature sensor 21. The remaining hot water storage amount is displayed. The display unit 46 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 become the hot water supply set temperature set by the operation unit 46 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 42 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.

  Further, the foam heat insulating material 26 covers the hot water storage tank 7 by sandwiching it between the front side heat insulating material 28a and the rear side heat insulating material 28b, and covers the remaining hot water storage tank 7 with the upper heat insulating material 27, and then the foam heat insulating material from the outside. By attaching the exterior case 1 formed to a size slightly smaller than the size of the hot water storage tank 7 covered with 26, the hot water storage tank 7 is well insulated and stored in the groove 29 of the front side heat insulating material 28a. The piping member 30 comprising the hot water discharge pipe 8 and the bypass pipe 10 thickens the upper side of the hot water storage tank 7 and suppresses heat dissipation from the upper part of the hot water storage tank 7 where high temperature water is stored as much as possible. The piping member 30 which is obtained and stored is prevented from freezing, and the lower side of the hot water storage tank 7 is thinned, and the heat storage tank 7 is stored by receiving heat radiation from the lower part of the hot water storage tank 7 where relatively low temperature water is stored. Member 3 It is obtained to carry out aggressively anti-freeze of.

  Next, another embodiment shown in FIG. 7 will be described. The groove portion 29 formed in the front side heat insulating material 28a is gradually thinned from the upper side of the hot water storage tank 7 toward the lower side. In addition, the groove 29 is formed so as to be gradually deeper from the upper side toward the lower side, and can be formed easily and inexpensively. Since the thickness of the heat insulating material 28a is gradually reduced along with the amount of heat released, the effect of suppressing heat release and preventing freezing is naturally achieved.

DESCRIPTION OF SYMBOLS 1 Exterior case 2 Heating means 7 Hot water storage tank 26 Foam heat insulating material 28 Side surface heat insulating material 28a Side surface front heat insulating material 28b Side surface rear heat insulating material 29 Groove part 30 Piping member

Claims (2)

  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 heat insulating material for heat insulation and insulation of the hot water storage tank in a space between the hot water storage tank and the outer case, Further, the outer peripheral wall of the heat insulating material is provided with a vertically long groove portion that is connected to the upper portion of the hot water storage tank and accommodates a piping member extending downward, and the thickness of the groove portion of the heat insulating material is the upper portion of the hot water storage tank. A hot water storage type hot water heater characterized by a thicker side and a thinner lower side.   The hot water storage type hot water heater according to claim 1, wherein the thickness of the groove portion of the heat insulating material is gradually reduced from the upper side to the lower side of the hot water storage tank.

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