JP4102780B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that fills a bathtub with hot water stored in a hot water storage tank.

Conventionally, in this type of hot water supply system, the hot water filling to the bathtub is carried out little by little while watching the water level of the bathtub, and the hot water filling to the set water level is made with the position where the circulation port of the bathtub is submerged as the reference water level. It was to be done. (For example, refer to Patent Document 1.)
JP-A-6-101904

  By the way, with this conventional one, a small amount of hot water filling is repeated many times, so the hot water mixing valve and open / close valve opens and closes many times. There was a problem that it took too long.

Therefore, in order to solve the above-described problems, the present invention is particularly connected to the bathtub according to the first aspect, a hot water storage tank for storing hot water, a hot water pipe for dropping the hot water of the hot water storage tank into the bathtub, and the bathtub. A bath circulation circuit and a bath circulation pump that circulates hot and cold water from the bathtub to the bath circulation circuit, where the hot water in the hot water storage tank is filled with water up to the set water level in the bathtub, and below the circulation port. If there is remaining hot water in the hot water, set a predetermined amount that is more than half of the set amount of hot water, then set an appropriate amount of hot water in the bathtub beforehand, and the water level sensor will indicate the water level after filling the hot water more than half of the hot water amount. The required amount of hot water filling is calculated from the difference between the reference water level obtained for the first time detected in step 1 and the current water level, and hot water filling is performed according to the calculation result.

According to a second aspect of the present invention, the calculation is obtained from the product of the water level difference between the reference water level and the current water level and the bathtub cross-sectional area.
Further, according to the third aspect, after the predetermined amount of hot water filling of the set hot water filling amount, air purge for driving the bath circulation pump for a predetermined time is performed.

  According to the first aspect of the present invention, when there is no remaining hot water above the circulation port, at least one half of the set amount of hot water is first filled, and the circulation port is submerged and brought close to the set water level. After that, the remaining water is filled up to the set water level, so the waiting time is shortened and the waiting time is shortened. Further, the water can be filled up to the set water level more accurately and can be used with confidence.

Further, according to the second aspect, since the difference in water level and the sectional area of the bathtub are multiplied, more accurate hot water filling can be performed and the usability is extremely good.
Further, according to the third aspect, since the air purge is performed before the final water level confirmation, it is possible to detect the water level with high accuracy and to perform the hot water filling up to the set water level at all times.

Next, an embodiment of the present invention will be described with reference to the drawings.
In this hot water storage type hot water supply apparatus, hot water is boiled and stored in the midnight hours when the unit price of contracted power by time zone is low, and the hot water stored in the hot water is used for hot water supply. 1 is a hot water storage tank 2 for storing hot water. A hot water storage tank unit 3 is provided at a lower portion of the hot water storage tank 2 and heats hot water, 4 is provided at an upper portion of the hot water storage tank 2 and heats hot water, and the lower heater 3 and the upper heater 4 is a heating means, 5 is a hot water tap provided in a kitchen or a washroom, 6 is a remote control for remotely operating the hot water storage type hot water supply device, and 7 is a bathtub.

  Reference numeral 8 denotes a heat exchanger made of a stainless steel serpentine tube for heating the hot water in the bathtub 7. The heat exchanger 8 is arranged in the upper part of the hot water storage tank 2. The heat exchanger 8 includes a bath outlet tube 9 and a bath circulation. A bath circulation circuit 12 comprising a bath return pipe 11 equipped with a pump 10 is connected to allow hot water in the bathtub 7 to circulate, and the hot water in the bathtub 7 is heated by the high-temperature water in the hot water storage tank 2 to keep it warm or retreat. Is done.

  Reference numeral 13 denotes a bath return temperature sensor that detects the temperature of the bath water flowing into the heat exchanger 8 through the bath return pipe 11, and reference numeral 14 denotes a bathtub that flows out of the heat exchanger 8 and flows into the bathtub 7 through the bath return pipe 9. It is a bath temperature sensor that detects the temperature of water.

  15 is a hot water supply comprising an electric mixing valve for mixing hot water from a hot water discharge pipe 16 communicating with the upper part of the hot water storage tank 2 and low temperature water from a water supply bypass pipe 18 branched from a water supply pipe 17 communicating with the bottom of the hot water storage tank 2. It is a mixing valve, and the mixing ratio is controlled such that the hot water temperature detected by the hot water temperature sensor 20 provided in the hot water supply pipe 19 downstream of the mixing valve becomes the hot water supply set temperature set by the user using the remote controller 6.

  Reference numeral 21 denotes a hot water filling pipe branched from the hot water supply pipe 19 and communicated with the bath return pipe 11. The hot water filling pipe 21 includes a hot water filling valve 22 for starting / stopping hot water filling to the bathtub 7, and a bathtub 7. A bath flow rate counter 23 that counts the amount of hot water filled in the water and two check valves 24 that prevent the bath water from flowing back to the hot water supply pipe 19 are provided.

  A plurality of hot water storage temperature sensors 25 are arranged in the vertical direction of the hot water storage tank 2. In this embodiment, five hot water storage temperature sensors are arranged and are called 25 a, 25 b, 25 c, 25 d, 25 e from the top. Is used to detect how much heat is left in the hot water storage tank 2 and to detect the temperature distribution in the vertical direction in the hot water storage tank 2.

  The remote controller 6 is provided with a hot water supply temperature setting switch 26 for setting the hot water supply set temperature and a bath temperature setting switch 27 for setting the bath set temperature. Automatic bathing that fills the amount of water filled with a water filling amount setting switch (not shown) and keeps it warm for a predetermined time and replenishes water at a predetermined temperature to the set water level when the water level in the bathtub 6 drops by a predetermined amount. A switch 28 and a reheating switch 29 that repels bathtub water are provided.

  A hot water supply control unit 30 includes a microcomputer that receives the input of each sensor in the hot water storage tank unit 1 and controls driving of each actuator, and constitutes a control unit. The remote controller 6 is connected to the hot water supply control unit 30 wirelessly or by wire so that the user can set an arbitrary hot water supply set temperature and bath set temperature.

  31 is a water level sensor composed of a pressure sensor provided in the middle of the bath outlet pipe 19 and sets an appropriate amount of hot water filling of the bathtub 7 beforehand at the time of installation or the like, and 2/3 of this hot water amount is set to the water level after filling. This is detected by the water level sensor 31 and stored in the hot water supply control unit 30 as a reference water level, and the remaining 1/3 is filled to obtain a set water level.

  32 is an overpressure relief valve for releasing the overpressure of the hot water storage tank 2, 33 is a pressure reducing valve for reducing the pressure of the water supply, 34 is a hot water supply flow rate counter for counting the amount of hot water to be supplied, and 35 is provided in the bath outlet pipe 19. A flow sensor 37 for detecting the presence of hot water above the circulation port 36 and a water supply temperature sensor 37 for detecting the temperature of the water supply.

Next, the operation of this embodiment will be described.
First, when the hot water storage temperature sensor 25 detects that the necessary amount of heat does not remain in the hot water storage tank 2 in the midnight power time zone, the hot water supply control unit 30 raises the lower heater 3 and the upper heater 4. Issue a start command. Upon receiving the command, the lower heater 3 and the upper heater 4 start energization, and the hot water in the hot water storage tank 2 is heated to a high temperature by the predetermined time in the morning and stored.

  Next, the hot water supply operation will be described. When the hot water tap 5 is opened, the water supplied from the water supply pipe 17 flows into the hot water storage tank 2. Then, the hot water stored in the hot water storage tank 2 flows into the hot water supply mixing valve 15 through the hot water discharge pipe 16 and is mixed with the low temperature water from the hot water supply bypass pipe 18. The adjusted hot water at the hot water supply set temperature is supplied from the hot water tap 5. Then, the hot water supply is completed by closing the hot water tap 5.

  Next, the bath boiling operation will be described with reference to the flowchart of FIG. 3. When the bath automatic switch 28 of the remote controller 5 is turned on, the automatic operation starts. First, in step 38, the remaining hot water above the circulation port 36 of the bathtub 7. If there is no remaining hot water on top, the set amount of hot water filled in 2 × 3/3 is poured in step 39, the process proceeds to step 40, and the bath circulation pump 10 is turned on. It is determined whether the circulation pump 10 has been driven for 3 minutes. If YES, the flow proceeds to step 42 to determine whether the flow sensor 35 is on. The bath circulation pump 10 is turned off, and the air purge of the bath circulation circuit 12 is completed.

  Then, the process proceeds to step 45, where the current current water level is detected by the water level sensor 31 to determine the water level difference from the set water level. In the state where the bathtub 7 previously determined in step 46 is empty, the set hot water amount × 2 / The water level up to the set water level when pouring No. 3 is taken as the reference water level difference, and it is determined whether the current water level difference is smaller than this reference water level difference. In YES, there is residual water below the circulation port 36. In step 47, the amount of water replenishment is calculated from the current water level difference x the sectional area of the bathtub, and then the process proceeds to step 48 to pour hot water with the calculated amount of water replenishment. The process proceeds to 49 to pour the remaining set hot water amount x 1/3, and after step 48 and step 49, the process proceeds to step 50, where it is first boiled, and in step 51, the automatic warming operation is started. .

  Therefore, when there is no remaining hot water above the circulation port 36, 2/3 of the set hot water filling amount is poured all at once, and after pouring, the water level is detected only once to fill the hot water. There is no operation, the hot water filling time is short, the waiting time is shortened and the usability is good, and the durability of the on / off valve of the hot water circuit is improved and it can sufficiently withstand long-term use.

  Furthermore, if there is no remaining hot water, the remaining 1/3 is poured, and if there is remaining hot water, the hot water can be poured to the set water level accurately by multiplying the water level difference by the bathtub cross-sectional area, and the hot water filling of the set water level is performed reliably. In addition, since the water level is detected after the air circulation of the bath circulation circuit 12 is always performed after 2/3 pouring, the water level can be detected with high accuracy and is always used with peace of mind.

  In this embodiment, an electric water heater using an electric heater as a heating source has been described as an example. However, even in a heat pump water heater that uses a midnight electric power or contract electric power as a heat source and stores heat by using a heat pump circuit as a heating source. Of course it is good

The schematic block diagram 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. The flowchart explaining the automatic driving | operation.

Explanation of symbols

2 Hot Water Storage Tank 7 Bath 8 Heat Exchanger 10 Bath Circulation Pump 12 Bath Circulation Circuit 21 Hot Water Pipe 30 Hot Water Supply Control Unit 36 Circulation Port

Claims (3)

A hot water storage tank for storing hot water, a hot water pipe for dropping the hot water of the hot water storage tank into the bathtub, a bath circulation circuit connected to the bathtub, and a bath circulation pump for circulating hot water in the bathtub to the bath circulation circuit In the thing, when the hot water in the hot water storage tank is filled with water up to the set water level in the bathtub and there is remaining hot water at a position below the circulation port, after filling the predetermined amount more than half of the set hot water amount, Precisely set the amount of hot water filling in the bathtub, and calculate the required amount of hot water filling from the difference between the reference water level obtained for the first time when the water level sensor detects the water level after filling with more than half of the water filling amount and the current water level. The hot water storage type hot water supply device is characterized in that hot water filling is performed according to the calculation result.   The hot water storage type hot water supply apparatus according to claim 1, wherein the calculation is obtained from a product of a water level difference between a reference water level and a current water level and a bath cross-sectional area.   3. The hot water storage type hot water supply apparatus according to claim 1, wherein an air purge for driving the bath circulation pump for a predetermined time is performed after filling a predetermined amount of the set amount of hot water.

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