JP4287852B2 - Control device for hot water storage water heater - Google Patents

Description

  The present invention relates to a control device for a hot water storage water heater such as a heat pump water heater or an electric water heater having a hot water storage tank.

Conventionally, in this type of water, the outer periphery of a hot water storage tank for storing hot water is covered with a heat insulating material made of foamed resin, and the hot water storage tank is kept warm and insulated so that hot water boiled by midnight power can be used in the evening. It is designed so that it can be used without boiling up even during peak hours of hot water use. (For example, refer to Patent Document 1.)
Japanese Patent No. 3561239

  By the way, with this conventional product, if a heat insulating material is attached to the outer periphery of the hot water storage tank when assembling the product, the heat insulating material is not inspected during subsequent inspections and repairs. The deterioration in capacity due to deterioration, etc. is not known from the appearance at all, so the decrease in capacity of this heat insulating material may increase the boiling time and boiling time, or increase the boiling start time. It has problems such as increased power consumption.

The present invention pays attention to this point and solves the above-mentioned drawbacks. In particular, the configuration is provided in a hot water storage tank for storing hot water heated by heating means, a water supply pipe for supplying water to the hot water storage tank, and an upper portion of the hot water storage tank. Insulation that detects and informs about a decrease in capacity due to poor heat insulation or damage of the heat insulating material in the case of having a hot water pipe for discharging hot water and a heat insulating material for heat insulation and heat insulation of the hot water storage tank. The adiabatic monitoring means is configured to detect a decrease in capacity by detecting that the integrated water supply amount with respect to the daily calculated amount of hot water is lower than the past actual use value .

  According to the present invention, by detecting and notifying a decrease in the capacity of the heat insulating material, repairing the heat insulating material and restoring the heat insulation / heat insulating effect, the boiling time and boiling time become longer, It is possible to prevent an increase in start time from becoming earlier, and as a result, it is possible to reliably prevent an increase in power consumption and always obtain an efficient operation.

Next, an embodiment of the present invention will be described with reference to the drawings.
1 is 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.

  The hot water storage tank unit 1 includes 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 a high temperature from the hot water supply pipe 8. A mixing valve 11 for mixing 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 13 provided in the hot water supply pipe 12 A hot water flow rate sensor 14 provided in the hot water supply pipe 11, a water supply 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 the hot water pipe A hot water filling valve 17 that opens and closes 16, a hot water filling flow rate sensor 18 that integrates the flow rate flowing through the hot water filling pipe 16, and an overpressure relief valve that releases an overpressure in the hot water storage tank 7 that is branched from the hot water discharge pipe 8. 19 and provided in the water supply pipe 9 A hot water supply control unit mainly composed of a pressure reducing valve 20 for reducing the supplied water pressure, a plurality of hot water temperature sensors 21 provided in the vertical direction of the side surface of the hot water tank 7, and a microcomputer for controlling the hot water tank unit 1. 22 and a heating circulation circuit 23 for connecting hot water storage tank 7 and heating means 2 to circulate hot water.

  Reference numeral 24 denotes a heat insulating material that covers and covers almost the entire outer surface of the hot water storage tank 7, and is composed of an integrally formed product of a foam heat insulating material 25 made of heat-resistant foamed polystyrene and a vacuum heat insulating material 26. By inserting a heat insulating material 26 and pouring a foamed resin there, a molded heat insulating material in which the vacuum heat insulating material 26 is located in the approximate center of the foam heat insulating material 25 is molded into a plurality of hot water tanks 7. is there.

  The vacuum heat insulating material 26 is composed of a core material and a jacket material made of a gas barrier laminate film that covers the core material, and is hermetically sealed by reducing the internal pressure to 1 Pa to 200 Pa. Can be produced by a known method.

  The heat insulating material 24 is divided into a bottom heat insulating material 241, a front lower heat insulating material 242, a front upper heat insulating material 243, a rear heat insulating material 244, and a top heat insulating material 245, and each hot water storage tank 7 is in contact with the hot water storage tank 7. The shape is formed along the outline of the tank 7, and the adjacent heat insulating materials 24 are attached in close contact with each other.

  In this way, the hot water storage tank 7 is covered with a plurality of heat insulating materials 24 and the vacuum heat insulating material 26 is embedded therein, so that the heat insulating and heat insulating effect is dramatically improved even if the heat insulating material 24 itself is thin. Yes, it is only necessary to attach the plurality of heat insulating materials 24 so as to fit into appropriate positions at the time of manufacturing and assembly, so that efficient work can be performed, man-hours for manufacturing and assembly can be reduced, and costs can be reduced. Desorption work at the time becomes very easy and workability is improved, and further, the vacuum heat insulating material 26 whose heat retaining and heat insulating effect is drastically reduced by breaking the vacuum is integrated into the foam heat insulating material 25. Since it is molded, it is easy to handle without worrying about destruction and can be used with peace of mind.

  In addition, since the positioning concave and convex portions 27 for positioning are provided on the surfaces of the plurality of heat insulating materials 24 that are in contact with each other, the positioning of the plurality of heat insulating materials 24 becomes accurate and the heat insulating materials 24 are in close contact with each other. The temperature is increased and heat dissipation due to air flowing through the gaps between the plurality of heat insulating materials 24 can be prevented, and the heat insulation and heat insulation performance is greatly improved.

In addition, piping grooves 28 for storing a plurality of pipes such as a water supply pipe 9 and a hot water discharge pipe 8 connected to the hot water storage tank 7 are provided on the surfaces of the plurality of heat insulating materials 24 that are in contact with each other. Is going.
Reference numeral 29 denotes an exterior body of the hot water storage tank 7 composed of a bottom plate 291, a front plate 292, a rear plate 293, and a top plate 294.

  The heating means 2 includes a compressor 30 for compressing carbon dioxide refrigerant, a refrigerant-water heat exchanger 31 as a condenser, a decompressor 32, and a heat pump circuit 34 including an air heat exchanger 33 as an evaporator, A blower 35 for blowing air to the air heat exchanger 33, a variable capacity circulation pump 36 provided in the middle of the heating circulation circuit 23, a refrigerant-water heat exchanger 31 inlet side of the heating circulation circuit 23, and a refrigerant-water A hot water inlet temperature sensor 37 for detecting the temperature of hot water flowing into the heat exchanger 31 and hot water flowing out of the refrigerant-water heat exchanger 31 provided on the outlet side of the refrigerant-water heat exchanger 31 of the heating circuit 23. The heat exchange outlet temperature sensor 38 for detecting the temperature of the heat and the heating control unit 39 mainly composed of a microcomputer for controlling the heating means 2 are provided.

  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 39 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 amount of hot water storage required for the next day, and instructs the heating control unit 39 to boil up the target hot water storage amount by the end of the night time zone. The circuit 34 is operated, and the driving of the circulation pump 36 of the heating circulation circuit 39 is started. Then, the hot water taken out from the lower part of the hot water storage tank 7 by driving the circulation pump 36 flows into the refrigerant-water heat exchanger 31 of the heating means 2 and is heated, and is returned to the upper part of the hot water storage tank 7 through the heating circuit 23. As a result, hot water is stored.

  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 37 detects a predetermined temperature or higher, a hot water supply control unit. 22 instructs the heating control unit 39 to stop the heating operation, the operation of the heat pump circuit 34 and the circulation pump 36 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 40 for setting a hot water supply set temperature, a hot water filling switch 41 for instructing hot water filling to the bathtub 5, a hot water filling amount setting switch 42 for setting the hot water filling amount, and a remaining time for hot water supply. An operation unit 44 having a remaining time display switch 43 for displaying the display, a display unit 45 composed of a dot matrix type fluorescent display tube, and controls the operation unit 44 and the display unit 45, and the hot water supply control unit 22 A remote control unit 46 mainly composed of a microcomputer for communication is provided. During normal operation, the display unit 45 detects the hot water supply set temperature and time information set by the operation unit 44 and the hot water storage temperature sensor 21. The remaining hot water storage amount is displayed. The display unit 45 may be a dot matrix type liquid crystal display unit.

  47 is a heat insulation monitoring means for detecting and notifying the heat insulation failure or breakage of the heat insulating material 24. The amount of temperature decrease from the end of boiling of the hot water storage tank 7 by the hot water storage temperature sensor 21 provided in the hot water storage tank 7 is indicated. This temperature decrease amount is detected and compared with the stored average temperature decrease amount. When a difference of a predetermined temperature or more is found in the comparison result, it is determined that the capacity of the heat insulating material 24 is decreased, and the hot water supply control unit 22 is used. Then, the display unit 45 of the remote controller 4 is output so as to display the heat insulation / heat insulation abnormality, and the user is urged to contact the store.

  In particular, in the vacuum heat insulating material 26, since the surface is damaged, the hole is immediately vacated, and the vacuum state is destroyed, so that the heat insulating effect is reduced to 1/10. The effect is very large and can be used with confidence.

  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 37 of the remote controller 4, and hot water is supplied via 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 41 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 operation of the embodiment of the present invention will be described with reference to the flowchart shown in FIG. 4. In step 48, it is determined whether the boiling is finished, and the process proceeds to step 49 in YES, and the temperature of the hot water storage tank 7 by the hot water storage temperature sensor 21. Is detected every predetermined time, and the current temperature decrease amount is extracted, and the process proceeds to step 50 to compare the average temperature decrease amount stored in advance with the current temperature decrease amount, and if there is a predetermined temperature difference YES, the process proceeds to step 51, where the display unit 45 is displayed with characters indicating the heat insulation / heat insulation abnormality, and the user is urged to contact the store.

  Therefore, by detecting and notifying the decrease in the capacity of the heat insulating material 24, repairing the heat insulating material 24 and restoring the heat insulation / heat insulating effect, the boiling time and the boiling time become longer, or the boiling starts. It is possible to prevent the time from becoming earlier, and it is possible to reliably prevent the power consumption that has been increasing without knowing it by detecting it positively.

  Next, another embodiment shown in FIG. 5 will be described. The heat insulation monitoring means 47 receives information from the hot water supply flow rate sensor 14 and the hot water supply flow rate sensor 52 from the hot water supply control unit 22, and calculates the daily product calculated hot water amount. When the water supply flow rate sensor 52 detects the accumulated water supply amount for one day and determines that the accumulated water supply amount for the product calculated hot water volume has decreased from the past actual use value, the capacity reduction of the heat insulating material 24 is displayed. This is reported by the unit 45.

  That is, when the capacity of the heat insulating material 24 decreases and the hot water temperature in the hot water storage tank 7 decreases, the mixing valve 11 can be used for hot water supply without being mixed with the mixing valve 11. In this case, the decrease in the capacity of the heat insulating material 24 can be reliably detected without worrying about wrong judgment.

  Next, another embodiment shown in FIG. 6 will be described. The adiabatic monitoring means 47 is connected to the hot water supply control unit 22, and the boiling start time and the boiling start time are detected and compared with past usage records. When the time is earlier than the time, it is determined that the capacity of the heat insulating material 24 is reduced, and the display unit 45 notifies the user.

  Thereby, it is possible to reliably detect the increase in the boiling start time and the boiling start time caused by the actual decrease in the capacity of the heat insulating material 24, and as a result, the increase in power consumption is reliably prevented. Efficient operation can always be obtained.

  In each of the embodiments, the hot water supply control unit 22 and the heat insulation monitoring unit 47 are configured by separate microcomputers, but two may be configured by one microcomputer, and the heat insulating material 24 is formed by vacuum with the foam heat insulating material 25. Although the heat insulating material 26 is integrally formed, the heat storage tank 7 may be insulated only by the vacuum heat insulating material 26 without being limited thereto, and the same effect can be obtained.

The schematic block diagram of the hot water storage type hot water supply apparatus of one Embodiment of this invention. Sectional drawing of the hot water storage tank unit. The block diagram of the principal part electric circuit. The flowchart. The block diagram of the principal part electric circuit which shows other embodiment. The block diagram of the principal part electric circuit which shows other embodiment.

Explanation of symbols

2 Heating means 7 Hot water storage tank 8 Hot water discharge pipe 9 Water supply pipe 14 Hot water supply flow rate sensor 21 Hot water storage temperature sensor 22 Hot water supply control unit 24 Heat insulating material 25 Foam heat insulating material 26 Vacuum heat insulating material 47 Thermal insulation monitoring means 52 Water supply flow rate sensor

Claims (2)

A hot water storage tank for storing hot water heated by the heating means, a water supply pipe for supplying hot water to the hot water storage tank, a hot water discharge pipe for discharging hot water connected to the upper part of the hot water storage tank, and heat insulation and insulation of the hot water storage tank. A heat insulation monitoring means for detecting and notifying a decrease in capacity due to poor heat insulation or damage of the heat insulation material , wherein the heat insulation monitoring means is an integrated water supply with respect to a daily calculated amount of hot water. A control device for a hot water storage type hot water heater, characterized in that it detects that the amount has decreased from the past actual use value, and judges a decrease in capacity .   2. The hot water storage system according to claim 1, wherein the heat insulation monitoring means detects that the boiling start time and the boiling start time have become earlier than the past use results, and judges the capacity drop. Water heater control device.

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