JP6467252B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus that eliminates waste of heat and performs hot water supply with high thermal efficiency.

  Conventionally, in this type, when the temperature of the hot water at the outlet of the heat exchanger is lower than a certain value at the beginning of the hot water, or when it is timed to exceed a certain time after the combustion is stopped, The heater is controlled so that the hot water temperature at the outlet becomes a target temperature higher than a predetermined target temperature. Conversely, it is maintained at a low target temperature during normal use, and wasteful heat supply and heat dissipation are maintained. Therefore, a hot water supply device with good thermal efficiency can be obtained. (See Patent Document 1)

JP 2012-159278 A

  By the way, in this conventional one, by setting the target temperature at the outlet of the heat exchanger to be low, the amount of heat released from the heat exchanger is reduced and the thermal efficiency is improved. When the temperature of the hot water drops greatly, and the feed water temperature is high, the temperature unevenness during on-off combustion increases, and the hot water discharge characteristics deteriorate.

This invention pays attention to this point, and in order to solve the above-mentioned problems, in particular, the configuration thereof includes a heater, a hot water heat exchanger heated by the heater and having flowing water as warm water, and an outlet of the hot water heat exchanger. Outlet temperature detection means for detecting hot water temperature, feed water temperature detection means for detecting the feed water temperature supplied to the hot water supply heat exchanger, hot water from the hot water supply heat exchanger and a feed water bypass pipe branched from the feed water pipe A hot water mixing valve for mixing with hot water, a hot water temperature detecting means for detecting a hot water temperature after being mixed by the hot water mixing valve, and a hot water temperature at which the hot water temperature detected by the hot water temperature detecting means can be arbitrarily set by a remote controller And a control means for controlling the hot water supply mixing valve so as to reach a set temperature, wherein the control means is configured such that the feed water temperature detected by the feed water temperature detection means is equal to or higher than a first predetermined temperature or a first predetermined temperature. Than There at the second time than the predetermined temperature, feed water temperature outlet temperature of the hot water supply heat exchanger for detecting the outlet temperature detecting means controls the heater so that the first fixing temperature, which is detected by the water temperature detecting means Is less than the first predetermined temperature and equal to or higher than the second predetermined temperature, when the relationship of the third fixed temperature lower than the first fixed temperature ≦ the hot water set temperature + the second fixed temperature ≦ the first fixed temperature is satisfied controls as the outlet temperature of the hot water supply heat exchanger for detecting the outlet temperature detection means becomes a second fixed temperature hot water set temperature +, provided that the third fixing temperature ≦ hot water set temperature + second fixing temperature ≦ first When the relationship between the fixed temperatures is not satisfied , the control is performed so that the first fixed temperature or the third fixed temperature is close to the value of the hot water supply set temperature + the second fixed temperature .

As described above, according to the present invention, when the feed water temperature is high or low, the hot water supply heat exchanger is heated to maintain a high temperature, thereby reducing the drop in hot water temperature during re-bathing and turning on and off. The temperature unevenness during combustion is reduced, and the hot water characteristics are also stabilized. Further, in a stable temperature zone where the feed water temperature is intermediate, the temperature of the hot water supply heat exchanger is set to the hot water set temperature + the second fixed temperature, here 10 ° C. However, the temperature is limited to a temperature having a relationship of the third fixed temperature ≦ the hot water supply set temperature + the second fixed temperature ≦ the first fixed temperature lower than the first fixed temperature. The lower the hot water supply set temperature is, the lower the temperature becomes, and the hot water supply heat exchanger can be maintained at a relatively low temperature, heat dissipation is prevented, and the heat efficiency can be improved. is there.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot-water supply apparatus which shows one Embodiment of this invention. The principal part flowchart of the same embodiment. The schematic block diagram of the hot-water supply apparatus which shows other one Embodiment.

Next, an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a hot water supply apparatus, which is roughly composed of a hot water supply circuit 2, a bath circulation circuit 3, and a hot water filling circuit 4.

  First, the hot water supply circuit 2 will be described. 5 is a water supply pipe, 6 is a water supply temperature detection means comprising a water supply thermistor for detecting the temperature of the water supply, 7 is a water supply flow rate sensor for detecting the amount of water supply, 8 is a hot water supply heat exchanger, 9 Is a hot water outlet pipe, 10 is an outlet temperature detecting means comprising a thermistor for detecting the temperature of hot water on the outlet side of the hot water supply heat exchanger 8, and 11 is a water supply pipe bypassing the hot water supply heat exchanger 8 from the water supply pipe 5 and connected to the hot water supply pipe 9. A bypass pipe, 12 is a hot water mixing valve for mixing hot water from the hot water outlet pipe 9 and low temperature water from the water supply bypass pipe 11 to control to an appropriate temperature, 13 is a hot water pipe, and 14 is mixed by a hot water mixing valve 12 A hot water supply temperature detecting means comprising a thermistor for detecting the temperature of the hot water, 15 is a water proportional valve for preventing excessive outflow, 16 is a faucet provided at the end of the hot water supply pipe 13, and 17 is for heating the hot water supply heat exchanger 8. Heating with burner section It is.

  Next, the bath circulation circuit 3 will be described. 18 is a bathtub, 19 is a bath return pipe, 20 is a bath return pipe, and 21 is integrated with the same fin so as to be heated together with the hot water supply heat exchanger 8 by the heater 17. The bath heat exchanger, 22 is a self-priming circulation pump that forcibly circulates hot water in the bathtub 18, 23 is a bath thermistor that detects the temperature of the circulating bath water, and 24 is the presence or absence of the bath water circulation. A bath flow sensor 25 is a water level sensor composed of a pressure sensor that detects the water level in the bathtub 18 by pressure, and 26 is a hot water filled three-way valve that connects the hot water filled circuit 4 and the bath circulation circuit 3 described later.

  Next, the hot water filling circuit 4 will be described. 27 is a hot water filling pipe branched from the downstream side of the hot water supply pipe 13 of the hot water supply circuit 2 and connected to the hot water filling three-way valve 26 of the bath circulation circuit 3, and 28 is a hot water filling pipe. A hot water solenoid valve that opens and closes the pipe 27, 29 is a hot water flow sensor that detects the flow rate passing through the hot water pipe 27, and 30 is provided double to prevent reverse flow of the bath water to the hot water supply circuit 2. A check valve is used to fill the bathtub 18 with a preset amount of hot water.

Reference numeral 31 denotes a control means configured by a microcomputer for controlling the hot water supply apparatus 1. 32 is a remote controller connected to the control means 31 and instructing the operation of the hot water supply device 1. The automatic operation switch 33 and optionally the hot water supply temperature is 37 ° C. to 50 ° C. in increments of 1 ° C. and 50 ° C. to 55 ° C. in increments of 5 ° C. Various operation switches such as a hot water supply temperature setting switch 34, a bath temperature setting switch 35, a heat retention switch 36, and the like, which can be set in the above, and a display 37 are provided.

The control means 31 controls the hot water supply mixing valve 12 so that the hot water temperature detected by the hot water temperature detecting means 14 becomes a hot water supply set temperature arbitrarily set by the remote controller 32. The control means 31 further includes: When the feed water temperature detected by the feed water temperature detection means 6 is equal to or higher than the first predetermined temperature, here 22 ° C. or higher, or lower than the second predetermined temperature, here lower than 9 ° C., the hot water supply heat exchange detected by the outlet temperature detection means 10 is detected. The heater 17 is controlled so that the outlet temperature of the vessel 8 becomes the first fixed temperature, here 57 ° C., and the feed water temperature detected by the feed water temperature detecting means 6 is less than the first predetermined temperature, here less than 22 ° C. When the temperature is within the range of 2 ° C. or more, here 9 ° C. or more, the outlet temperature of the hot water heat exchanger 8 detected by the outlet temperature detecting means 10 is the hot water set temperature + second fixed temperature, here 10 ° C. Fixed Time here in this case the third fixing temperature of a temperature lower than 57 ° C. and controls so as to be in the relationship of 57 ° C. Here 10 ° C. ≦ first fixing temperature is here 50 ° C. ≦ hot water set temperature + second fixing temperature.

The control by the control means 14 is performed from the start of the next hot water supply, and the outlet temperature of the hot water heat exchanger 8 is set to the hot water set temperature + second fixed temperature, here 10 ° C. 1 fixed temperature, here a third fixed temperature lower than 57 ° C., here 50 ° C. ≦ hot water supply set temperature + second fixed temperature 10 ° C. ≦ first fixed temperature here, 57 ° C. Control state, ie hot water supply heat exchange If the outlet temperature of the water heater 8 is controlled to 57 ° C. or less and the reheating operation for keeping the bath 18 warming or boiling is instructed, the capacity is insufficient in the low temperature state, so the hot water supply heat exchanger is unconditionally The outlet temperature of 8 is returned to 57 ° C.

  Next, the control state of the outlet temperature of the hot water supply heat exchanger 8 for improving the thermal efficiency will be described with reference to the flowchart of FIG. 2. If the feed water temperature detected by the feed water temperature detecting means 6 in step 38 is equal to or higher than the first predetermined temperature, That is, it is determined whether the temperature is 22 ° C. or higher. If YES, the process proceeds to step 39 and the heater 17 is controlled via the control means 14 so that the hot water temperature at the outlet of the hot water supply heat exchanger 8 becomes 57 ° C. which is the first fixed temperature. In step 38, if NO, the process proceeds to step 40, where it is determined whether the feed water temperature detected by the feed water temperature detecting means 6 is less than the second predetermined temperature, that is, less than 9 ° C. If YES, the process proceeds to step 39. As with the first predetermined temperature or higher, the heater 17 is controlled via the control means 14 so that the hot water temperature at the outlet of the hot water supply heat exchanger 8 becomes 57 ° C. which is the first fixed temperature. .

If NO at step 40, the routine proceeds to step 41, where it is determined whether the feed water temperature detected by the feed water temperature detecting means 6 is within a range of 9 ° C. or more which is less than 22 ° C. which is less than the first predetermined temperature and which is greater than or equal to the second predetermined temperature. If YES, the routine proceeds to step 42, where the hot water temperature at the outlet of the hot water supply heat exchanger 8 is controlled to a temperature obtained by adding the hot water supply set temperature by the remote controller 32 + 10 ° C. of the second fixed temperature. The temperature obtained by adding the set temperature + 10 ° C. of the second fixed temperature is 50 ° C. of the third fixed temperature ≦ the hot water set temperature + the temperature of adding the second fixed temperature of 10 ° C. ≦ 57 ° C. of the first fixed temperature If YES, the process returns to step 42 to control the hot water temperature at the outlet of the hot water supply heat exchanger 8 to be a temperature obtained by adding the hot water supply set temperature by the remote controller 32 + 10 ° C. of the second fixed temperature. It is a thing If NO in step 43, that is, if the outlet temperature setting of hot water supply heat exchanger 8 to which 10 ° C of hot water supply set temperature + second fixed temperature is added is not within the range of 50 ° C to 57 ° C, step Proceeding to 44, the closest fixed temperature in this range is set so that the relationship of 50 ° C. of the third fixed temperature ≦ the outlet temperature of the hot water supply heat exchanger ≦ 57 ° C. of the first fixed temperature.

When the feed water temperature is high or low in this way, the hot water supply heat exchanger is heated to maintain a high temperature, thereby reducing the drop in hot water temperature during re-bathing and reducing the temperature unevenness during on-off combustion. In the stable temperature zone in which the feed water temperature is intermediate, the temperature of the hot water supply heat exchanger is set to the hot water supply set temperature + the second fixed temperature, here 10 ° C., but the first fixed temperature. The temperature is limited to a temperature that satisfies the relationship of the lower third fixed temperature ≦ the hot water set temperature + the second fixed temperature ≦ the first fixed temperature. In practice, the temperature is 50 ° C. to 57 ° C. The lower the set temperature, the lower the temperature, and the hot water supply heat exchanger can be maintained at a relatively low temperature, heat dissipation is prevented, and the thermal efficiency can be improved.

  Next, FIG. 3 showing another embodiment will be described. However, the same components are denoted by the same reference numerals and the description thereof will be omitted, and only the differences will be described. The above-described control information of the outlet temperature of the hot water supply heat exchanger 8 is stored, and hot water supply control is performed in accordance with each control information stored in the storage means 46 from the next hot water supply, thereby changing during hot water supply. Large temperature fluctuation can be surely prevented, and since the next hot water supply is used, hot water supply with high thermal efficiency can be started smoothly, and stable hot water supply can always be maintained.

2 Hot water supply circuit 3 Bath circulation circuit 4 Hot water filling circuit 6 Water supply temperature detection means 8 Hot water supply heat exchanger 10 Outlet temperature detection means 17 Heater 31 Control means 32 Remote control 45 Storage means

Claims (1)

A heater, a hot water supply heat exchanger heated by the heater and using flowing water as warm water, outlet temperature detection means for detecting a hot water temperature at the outlet of the hot water supply heat exchanger, and water supplied to the hot water supply heat exchanger A hot water mixing valve that mixes the hot water from the hot water heat exchanger and the hot water from the hot water heat exchanger and the hot water from the feed water bypass pipe branched from the hot water supply pipe, and the hot water after being mixed by the hot water mixing valve A hot water supply temperature detecting means for detecting the temperature and a control means for controlling the hot water mixing valve so that the hot water temperature detected by the hot water supply temperature detecting means becomes a hot water supply set temperature that can be arbitrarily set by a remote controller. When the feed water temperature detected by the feed water temperature detecting means is equal to or higher than the first predetermined temperature or lower than the second predetermined temperature lower than the first predetermined temperature , the hot water heat exchange detected by the outlet temperature detecting means is performed. vessel With the outlet temperature controlled heater so that the first fixing temperature, when the feed water temperature detected by the water temperature detecting means is within a range equal to or higher than the second predetermined temperature lower than the first predetermined temperature, the first fixed When satisfying the relationship of the third fixed temperature ≦ the hot water set temperature + the second fixed temperature ≦ the first fixed temperature lower than the temperature, the outlet temperature of the hot water heat exchanger detected by the outlet temperature detecting means is the hot water set temperature + second. controlled to be fixed temperature, however, is not satisfied third fixing temperature ≦ hot water set temperature + second fixed relationship temperature ≦ first fixing temperature is close to the value of the hot water set temperature + second fixing temperature A hot water supply apparatus that is controlled so as to have a first fixed temperature or a third fixed temperature .

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