JP2010014385A - Storage water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage water heater facilitating maintenance work of a plurality of temperature sensors attached to an outer shell of a hot water storage tank covered with a foamed heat insulating material. <P>SOLUTION: The storage water heater is provided with the hot water storage tank 7 for storing hot water heated by a heating means; an exterior body 1 for storing the hot water storage tank 7; the temperature sensors 28 provided on the outer shell of the hot water storage tank 7 and detecting the temperature of hot water within the hot water storage tank 7; and the foamed heat insulating material 25 set between the outer shell of the hot water storage tank 7 and the exterior body 1 and surrounding the hot water storage tank 7. Since cut grooves 27 are provided in the vicinity of portions of the foamed heat insulating material 25 where the temperature sensors 28 are installed, maintenance work of the temperature sensors 28 can be facilitated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus that stores hot water in a hot water storage tank, and particularly to a heat insulating structure thereof.

  Conventionally, in this type, there is one in which a space between an exterior body for storing a hot water storage tank and a hot water storage tank is covered with a foam heat insulating material. In this type of hot water storage type hot water supply apparatus, heat loss due to heat dissipation is prevented by a foam heat insulating material made of heat resistant foamed polystyrene that covers and heats and covers almost the entire surface of the hot water storage tank. (For example, see Patent Document 1)

In addition, in order to measure the temperature in the hot water storage tank, temperature sensors are attached to multiple locations in the height direction of the hot water tank, and the outer surface of the hot water tank is wrapped with foam insulation to measure the temperature in the hot water tank. It is managed by a hot water supply control unit that controls various devices connected to the sensor and lead wires. Further, when performing maintenance work such as replacement of the temperature sensor for some reason, the foamed heat insulating material around the temperature sensor is cut out with a cutter or the like, and the temperature sensor is taken out.
Japanese Patent Laid-Open No. 2004-251521

  However, with this conventional device, it is difficult to judge the exact location of the temperature sensor that caused the failure because it is covered with foam insulation, and the operator cuts off the foam insulation around the temperature sensor with his own sense. For this reason, there was a waste of cutting off the foam insulation material.

  In addition, the lead wire connecting the hot water supply control unit and the temperature sensor may be accidentally damaged when the foam heat insulating material is cut off.

  Therefore, in order to solve the above problems, the present invention is provided with a hot water storage tank for storing hot water heated by a heating means, an exterior body housing the hot water storage tank, and an outer shell of the hot water storage tank, and the hot water temperature in the hot water storage tank is provided. In the hot water storage type hot water supply apparatus, comprising: a temperature sensor for detecting heat; and a foamed heat insulating material surrounding the hot water storage tank between the hot water tank outer shell and the exterior body. A cutting groove is provided so as to surround the installation location.

  The cutout groove has a square shape. Moreover, the groove for cutting is provided on the exterior body side and the hot water storage tank side of the foam heat insulating material.

  According to the first aspect of the present invention, when the temperature sensor does not function for some reason and maintenance work is performed, the foam insulation is accurately provided by having a groove for cutting near the temperature sensor of the foam insulation covering the hot water storage tank. Since it can be cut, useless cutting work is eliminated, maintenance work time is shortened and efficient work is performed, and since it is not cut in advance but only the groove, the heat retention performance may be lowered Absent.

  According to the second aspect of the present invention, since the shape of the groove for cutting is a square that is easy to cut, it is only a straight line, and it is very easy to cut and the work time can be reduced. Further, according to the third aspect, the same shape of the cut groove on the hot water storage tank side that is symmetrical to the cut groove on the exterior body side of the foam insulation material is provided between the lead wire on the hot water tank side and the foam heat insulation material. Since the gap is made by the groove for cutting, it is possible to cut the lead wire without damaging it, and the temperature sensor can be taken out easily and safely.

Next, an embodiment of the present invention will be described with reference to the drawings.
1 is an exterior body 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 A hot water valve 17 that opens and closes the pipe 16, a hot water flow sensor 18 that integrates the flow rate through the hot water pipe 16, and an overpressure relief that releases an overpressure in the hot water storage tank 7 that is branched from the hot water pipe 8. Provided in the valve 19 and the water supply pipe 9 A pressure reducing valve 20 for reducing the water supply pressure, a hot water supply control unit 21 mainly composed of a microcomputer for controlling various devices in the outer case 1, the hot water storage tank 7 and the heating means 2 are connected to supply hot water. A heating-circulation circuit 24 including a heat-pump forward pipe 22 to be circulated and a heat-pone return pipe 23 is provided.

  Reference numeral 25 denotes a foam heat insulating material made of heat-resistant foamed polystyrene that covers almost the entire outer surface of the hot water storage tank 7 and performs heat insulation and heat insulation. An upper surface and a bottom surface of the hot water storage tank 7 are formed in a substantially hemispherical shape, and a lid-like foam material 26 formed of the foam heat insulating material 25 is provided along the upper surface and the bottom surface.

  Reference numeral 27 denotes a cut groove formed so as to surround each installation location of the five temperature sensors 28 covered with the foam heat insulating material 25 and attached to each measurement location in the height direction of the hot water storage tank 7. The groove 27 is formed so that the foam heat insulating material 25 is easily cut off during maintenance such as repair and inspection of the temperature sensor 28, and the shape of the foam heat insulating material 25 is a square having a side length of 5 cm to 10 cm. Thus, it is provided in the exterior body 1 side, and is also formed in the same shape also in the hot water storage tank 7 side which is the symmetrical position. The temperature sensor 28 is affixed to the surface of the hot water storage tank 7 near the center of the frame surrounded by the cutout groove 27.

  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 24, a refrigerant-water heat exchanger 31 inlet side of the heating circulation circuit 24, 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 24. 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.

  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 made of a dot matrix type fluorescent display tube, the operation unit 44 and the display unit 45, and the hot water supply control unit 21. 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 28. The remaining hot water storage amount is displayed. The display unit 45 may be a dot matrix type liquid crystal display unit.

Next, the maintenance work when the temperature sensor 28 fails and the temperature sensor 28 is replaced will be described. The foam heat insulating material 25 covering the outer shell of the hot water storage tank 7 is squared along the groove 27 for cutting with a cutter or the like. The lead wire 29 and the temperature sensor 28 are removed with a soldering iron, and the temperature sensor 28 is taken out. And after soldering the new temperature sensor 28 and the lead wire 29, this temperature sensor 28 is affixed on the original location of the hot water storage tank 7, and the cut | disconnected foaming insulation material 25 is reattached by an adhesion means, and a maintenance operation | work is complete | finished.
As a result, when the cutting operation is performed, the cutting groove 27 serving as a mark can be accurately grasped, and the cutting groove 27 can be easily cut out by making the shape of the cutting groove 27 a square made of only a straight line. The maintenance work can be performed very easily without increasing the efficiency and without fear of damaging the lead wire 29 connected to the temperature sensor 28.

The schematic block diagram of the hot water storage type hot-water supply apparatus which shows one Embodiment of this invention. The longitudinal cross-sectional view of the principal part. The front view of the hot water storage tank and heat insulating material. AA line sectional view of the hot water storage tank in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exterior body 2 Heating means 7 Hot water storage tank 25 Foam heat insulating material 27 Cut-out groove 28 Temperature sensor 29 Lead wire

Claims (3)

  A hot water storage tank for storing hot water heated by the heating means, an exterior body housing the hot water storage tank, a temperature sensor provided in an outer shell of the hot water storage tank for detecting the hot water temperature in the hot water storage tank, and the outer shell of the hot water storage tank In the hot water storage hot water supply apparatus provided with a foam heat insulating material that surrounds the hot water storage tank between the hot water storage tank and the exterior body, the foam heat insulating material is provided with a groove for cutting so as to surround the temperature sensor installation location. A hot water storage hot water supply device characterized by that.   The hot water storage type hot-water supply apparatus according to claim 1, wherein the cut-out groove has a square shape.   The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the groove for cutting is provided on an exterior body side and a hot water storage tank side of the foam heat insulating material.

Images