JP5989512B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that circulates and heats hot water in a hot water storage tank with a heating means.

  Conventionally, in this type, water taken out from the lower part of the hot water tank is heated to the target temperature by heating it up and returned from the upper part of the hot water tank. The hot water boiled from the upper part of the hot water storage tank is discharged from the upper part of the hot water tank so that hot water is supplied. It will be in the state where the warm water of temperature is located.

  In order to detect the remaining amount of hot water in the hot water storage tank, a plurality of hot water temperature sensors for detecting the hot water storage amount together with the temperature in the hot water storage tank are provided in the vertical direction of the outer periphery of the hot water storage tank. (See Patent Document 1.)

JP 2009-138981 A

  By the way, in this conventional thing, the thermistor was used as a hot water storage temperature sensor, but this thermistor detects the temperature in the front-end | tip part, the lead wire part connected with this element part, and the said element part As shown in FIGS. 3 and 4, the thermistor is attached with an attachment material made of aluminum tape in a state where only the protection portion is in contact with the hot water storage tank. As a result, the temperature of the hot water in the hot water storage tank could not be accurately detected due to an error caused by the temperature of the outside air around the lead wire.

  The hot water storage tank covers the entire hot water storage tank with a heat insulating material to prevent heat dissipation, and a lead wire outlet is formed in the heat insulating material, and the lead wire is taken out from there. The hot water storage temperature sensor is affected by the temperature of the outside air particularly near the lead wire outlet.

This invention pays attention to this point, and in order to solve the above-mentioned problems, in claim 1, in particular, the configuration thereof is 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, A hot water discharge pipe that is connected to the upper part of the hot water storage tank to discharge hot water, and a hot water storage temperature sensor that is provided in a plurality in the vertical direction of the outer periphery of the hot water storage tank and detects the amount of hot water stored together with the temperature in the hot water storage tank, The hot water storage temperature sensor includes an element portion for detecting temperature, a lead wire portion connected to the element portion, and a protection portion that covers and protects the element portion, and brings the protection portion into contact with the hot water storage tank. Then, a lead wire portion of a predetermined length from the boundary between the protection portion and the lead wire portion is brought into contact with the hot water storage tank, and the protection portion and the lead wire portion in contact with the hot water storage tank are covered with an attachment material to store the hot water attached to the tank, The hot water storage tank is covered with a heat insulating material, and a lead wire outlet for taking out the lead wire portion is formed, and the protective portion of the hot water temperature sensor near the lead wire outlet is in contact with the hot water storage tank, A lead wire part of a predetermined length from the protective part, the lead wire part, and the boundary part is brought into contact with the hot water storage tank, and the protective part and the lead wire part contacting the hot water storage tank are covered with an attachment material and attached to the hot water storage tank. It is a thing.

  According to the first aspect of the present invention, the protection portion of the hot water temperature sensor is brought into contact with the hot water storage tank, and the lead wire portion of a predetermined length is brought into contact with the hot water storage tank from the boundary portion between the protection portion and the lead wire portion. Because the protection part and the lead wire part that are in contact with the hot water storage tank are covered with the mounting material and attached to the hot water storage tank, the heat of the surface of the hot water storage tank is also transmitted to the lead wire part, and the protection part and the protection part From the boundary between the lead wire and the lead wire, the lead wire for a predetermined length is the same as the temperature of the hot water tank surface, and from the boundary between the protective part and the lead wire part that is in contact with the hot water tank. Covering the lead wire part of a predetermined length with the mounting material is cut off from the outside air around the lead wire part, preventing the lead wire part from being affected by the temperature of the outside air around the lead wire part, thereby storing hot water Accurate temperature of hot water in the tank In which it can be detected.

The hot water storage tank is covered with a heat insulating material, and a lead wire outlet for taking out the lead wire portion is formed, and the protective portion of the hot water temperature sensor in the vicinity of the lead wire outlet is brought into contact with the hot water storage tank. The hot wire storage tank is covered with an attachment material so that the lead wire portion of a predetermined length from the boundary portion and the protective portion is brought into contact with the hot water storage tank, and the protective portion in contact with the hot water storage tank and the lead wire portion are covered with an attachment material. Because it is attached to the tank, the heat of the hot water storage tank surface is also transmitted to the lead wire part, and the lead wire part of a predetermined length from the boundary part between the protective part and the protective part and the lead wire part is the temperature of the hot water tank surface. In addition, by covering the lead wire part of a predetermined length from the boundary part between the protective part and the protective part and the lead wire part in contact with the hot water storage tank with an attachment material, the outside air near the lead wire outlet Blocked Are those that can lead portion is prevented from being influenced by the outside air temperature around the lead wire outlet, thereby accurately detect the temperature of hot water in the hot water storage tank.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing of the hot water storage type hot water supply apparatus which shows one Embodiment of this invention. The block diagram of the principal part electric circuit. Explanatory drawing which shows the state which attached the hot water storage temperature sensor. The AA sectional view in the state where the hot water storage temperature sensor was attached. Explanatory drawing which shows the state which attached the conventional hot water storage temperature sensor. BB sectional drawing of the state which attached the hot water storage temperature sensor.

Next, an embodiment of the present invention will be described based on a hot water storage type hot water supply apparatus shown in the drawings.
1 is a cylindrical hot water storage tank that uses heating means 2 composed of a heat-pump unit using carbon dioxide refrigerant to boil hot water in the midnight hours when the unit price of contract power by time is low and store hot water. A water supply pipe 3 for supplying water is connected to the bottom, and a hot water discharge pipe 4 for discharging hot water stored in a hot water tap (not shown) or the like is connected to the top.

  Reference numeral 5 denotes a hot water supply pipe 4 on one side, a hot water supply water bypass pipe 6 branched from the water supply pipe 3 on the other side, and a hot water mixing valve comprising an electric three-way valve connected to a hot water supply pipe 7 in the center. The hot water and hot water supply bypass pipe 6 are mixed and supplied at a hot water supply set temperature set by the kitchen remote controller 8. The hot water supply thermistor 9 provided in the hot water supply pipe 7 is used. The hot water side opening degree of the hot water discharge pipe 4 and the water side opening degree of the hot water supply water supply bypass pipe 6 are adjusted by feedforward control from the hot water supply temperature, the hot water supply temperature, and the hot water supply set temperature.

  10 is connected to a hot water supply pipe 4 on one side, and a hot water supply bypass pipe 11 branched from the hot water supply water supply bypass pipe 6 on the other side, and the center is connected to a bath circulation circuit (not shown). The hot water from the outlet pipe 4 and the water supply from the bath water supply bypass pipe 11 are mixed with the bath mixing valve composed of an electric three-way valve so that the bath set temperature set by the bathroom remote controller 12 is obtained. Hot water filling is performed, and the hot water side opening of the hot water discharge pipe 4 and the water side opening of the hot water supply bypass pipe 11 are adjusted by feedforward control from the hot water temperature, the water supply temperature, and the bath set temperature.

  Reference numeral 13 denotes a plurality of hot water storage temperature sensors attached to the outer peripheral wall of the hot water storage tank 1. Four hot water storage devices 13 a, 13 b, 13 c, and 13 d are provided in order from the top at equal intervals in the vertical direction. This is input to the hot water supply control unit 14 to perform calculation and operation control of the remaining hot water amount, the boiling operation, the boiling end operation, and the like.

  The hot water supply control unit 14 causes the shutoff valve 16 provided upstream of the pressure reducing valve 15 of the water supply pipe 3 for several seconds when the remaining hot water amount reaches a predetermined remaining hot water amount detected by the hot water storage temperature sensor 13a, here 50L. By controlling the opening and closing, the hot water supply is interrupted and the user is notified that the hot water is almost exhausted.

  The shutoff valve 16 also serves as an emergency shutoff valve that closes the water supply pipe 3 by detecting water leakage from the hot water storage tank 1 or each pipe, and this operation is given priority.

Reference numeral 17 denotes a heating circulation circuit including an outward pipe 18, a return pipe 19, and a circulation pump 20 that connect the hot water storage tank 1 and the heating means 2 so that hot water can circulate.
21 is a water supply thermistor provided in the middle of the water supply pipe 3, 22 is a pressure relief valve provided in the hot water discharge pipe 4, and 23 is a reverse that prevents a reverse flow from the hot water storage tank 1 side provided in the water supply pipe 3. It is a stop.

  The hot water storage temperature sensor 13 uses a thermistor and covers and protects the element portion 24 for detecting the temperature at the tip portion, the lead wire portion 25 connected to the element portion 24, and the element portion 24. And a protective part 26 made of a coating agent to be attached to the surface of the hot water storage tank 1 by an attachment material 27 made of an aluminum sticking tape.

Next, the mounting structure of the hot water storage temperature sensor 13 will be described.
As shown in FIGS. 3 and 4, the protection portion 26 of the hot water temperature sensor 13 and the lead wire portion 25 having a predetermined length from the boundary between the protection portion 26 and the lead wire portion 25 are brought into contact with the outer peripheral wall of the hot water storage tank 1. In this state, the attachment part 27 is attached so as to cover all of the protection part 26 and the lead wire part 25 having a predetermined length from the boundary between the protection part 26 and the lead wire part 25.

  Thereby, the heat of the surface of the hot water storage tank 1 is also transmitted to the lead wire portion 25, and the lead wire portion 25 of a predetermined length from the boundary portion between the protective portion 26 and the protective portion 26 and the lead wire portion 25 becomes the surface of the hot water storage tank 1. Further, the protective portion 26 that is in contact with the hot water storage tank 1 and the lead wire portion 25 of a predetermined length from the boundary portion between the protective portion 26 and the lead wire portion 25 are covered with the attachment material 27. Thus, the outside air around the lead wire portion 25 is blocked and the lead wire portion 25 is prevented from being affected by the temperature of the outside air around the lead wire portion 25, thereby accurately detecting the temperature of the hot water in the hot water storage tank 1. It is something that can be done.

  The hot water storage tank 1 is covered with a heat insulating material (not shown), and a lead wire outlet (not shown) for taking out the lead wire portion 25 is formed in the heat insulating material. The hot water storage temperature sensor 13 in the vicinity of the wire outlet is brought into contact with the protective portion 26 and the hot water storage tank 1, and the protective wire 26, the lead wire portion 25, and the lead wire portion 25 of a predetermined length from the boundary portion are connected to the hot water storage tank 1. The protective portion 26 and the lead wire portion 25 that are in contact with the hot water storage tank 1 may be covered with the attachment material 27 and attached to the hot water storage tank 1.

  As a result, the lead wire portion 25 having a predetermined length from the boundary between the protection portion 26 of the hot water storage temperature sensor 13 and the lead wire portion 25 is shielded from outside air near the lead wire outlet, and the lead wire portion 25 is disconnected from the lead wire outlet. The temperature of hot water in the hot water storage tank 1 can be accurately detected by preventing the influence of the temperature of the outside air in the vicinity.

  Further, the lead wire part 25 of a predetermined length from the protection part 26 of the hot water storage temperature sensor 13 and the boundary part between the protection part 26 and the lead wire part 25 is brought into contact with the hot water storage tank 1 and covered with the attachment material 27. May be performed on the hot water storage temperature sensor 13 used for the determination of the hot water storage operation start of the hot water storage tank 1.

  Thereby, when determining the hot water storage operation start of the hot water storage tank 1, the temperature of the hot water in the hot water storage tank 1 can be accurately detected, so the timing of the hot water storage operation start can be accurately determined.

  In the conventional method for attaching the hot water storage temperature sensor 13, when the hot water in the hot water storage tank 1 is 61 ° C., the detected temperature of the hot water storage temperature sensor 13 in the middle and lower portions of the hot water storage tank 1 covered with the heat insulating material is 61 ° C. On the other hand, the detection temperature of the hot water storage temperature sensor 13 at the upper part of the hot water storage tank 1 where the lead wire outlet is formed is affected by the temperature of the outside air near the lead wire outlet, such as 58 ° C. In the method of attaching the hot water storage temperature sensor 13 in the example, the hot water storage tank 1 in which the middle and lower portions of the hot water storage tank 1 covered with the heat insulating material and the lead wire outlet are formed when the hot water in the hot water storage tank 1 is 61 ° C. The detection temperature of all the hot water storage temperature sensors 13 at the upper part is 61 ° C., and it can be prevented from being influenced by the temperature of the outside air near the lead wire outlet.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heating means 3 Water supply pipe 4 Hot water discharge pipe 13 Hot water storage temperature sensor 24 Element part 25 Lead wire part 26 Protection part 27 Attachment material

Claims (1)

A hot water storage tank for storing hot water heated by the heating means, a water supply pipe for supplying 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 a plurality of vertical pipes on the outer periphery of the hot water storage tank A hot water storage temperature sensor that detects the amount of hot water stored together with the temperature in the hot water storage tank, wherein the hot water storage temperature sensor includes an element portion for detecting the temperature, and a lead wire portion connected to the element portion. And a protective part that covers and protects the element part, contacts the hot water storage tank with the protective part, and stores a lead wire part of a predetermined length from the boundary part between the protective part and the lead wire part. Touch the tank, cover the hot water storage tank with the protective part and the lead wire part with a mounting material and attach it to the hot water storage tank. The hot water storage tank is covered with a heat insulating material and is used to take out the lead wire part. Lee A wire outlet is formed, and the hot water storage temperature sensor protective portion in the vicinity of the lead wire outlet is brought into contact with the hot water storage tank, and the lead wire portion of a predetermined length is stored in the hot water from the protective portion, the lead wire portion, and the boundary portion. A hot water storage type hot water supply device, wherein the hot water storage device is attached to the hot water storage tank by covering the protective portion and the lead wire portion in contact with the tank with a mounting material.

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