JP4149901B2 - Hot and cold water heater - Google Patents

Description

  The present invention relates to a hot and cold water storage type hot water heater that mixes hot water stored in hot water and water from a water supply pipe with a mixing valve to supply hot water.

Conventionally, this kind of hot and cold mixed water storage type hot water heater is as shown in FIG.
That is, 1 is a hot water storage tank having a capacity of 150 liters for storing hot water, 2 is a water supply pipe for supplying water to the hot water storage tank 1, 3 is a pressure reducing valve provided in the water supply pipe 2 to reduce the water pressure, and 4 is hot water stored in the hot water storage tank 1. A hot water supply pipe for supplying hot water is provided, 5 is a relief valve for releasing the temperature expansion of the hot water in the hot water storage tank 1, 6 is a water supply bypass pipe branched downstream of the pressure reducing valve 3 of the water supply pipe 2, and 7 is hot water from the hot water supply pipe 4. A mixing valve that mixes water from the water supply bypass pipe 6, 8 is a driving device for the mixing valve, 9 is a mixing pipe that supplies hot water mixed by the mixing valve 7 to a faucet (not shown), and 10 is a mixing valve A mixing temperature sensor 11 detects the temperature of the hot water mixed in 7, and a flow rate counter 11 detects the amount of hot water flowing through the mixing pipe 9.

  Reference numeral 12 denotes a heat pump type heater for heating the hot water stored in the hot water storage tank 1, and 13 includes an outward pipe 14, a return pipe 15, and a circulation pump 16 that connect the hot water storage tank 1 and the heater 12 in a circulatory manner. A circulation circuit, 17, 18, 19, and 20 are hot water storage temperature sensors provided above and below the outer peripheral surface of the hot water storage tank 1, and 21 is a control device that controls the operation of the hot and cold water storage type hot water heater.

  The control device 21 predicts an approximate amount of hot water storage based on the temperature detected by the hot water storage temperature sensors 17, 18, 19, 20, and drives the circulation pump 16 and the heater 12 to circulate and heat the hot water in the hot water storage tank 1. A predetermined amount of hot water is stored with a remote controller (not shown) or the like.

  Next, when the faucet is opened and the flow rate counter 11 detects flowing water and enters the hot water supply state, the controller 21 sets the mixed hot water temperature detected by the mixed temperature sensor 10 to a mixing temperature preset by a remote controller or the like. Thus, the drive device 8 of the mixing valve 7 is driven by feedforward control and feedback control to control the temperature and supply hot water.

  Further, a mixing tank 22 is provided on the side of the water supply bypass pipe 6 of the mixing valve 7 for mixing the hot water flowing from the hot water side of the mixing valve and the water stored inside when the hot water supply is stopped. . A mixing promotion plate 23 for promoting the mixing of hot and cold water is provided on the mixing valve 7 side of the mixing tank 22.

Here, as shown by a broken line in FIG. 4, when the amount of stored hot water is less than the capacity of the hot water storage tank 1, a hot water boundary layer is generated. At this time, after the hot water supply is stopped, the mixing valve 7 is in a hot water communication state. The hot water in the hot water supply pipe 4 is mixed with the mixing valve so that the hot water boundary layer height level of the hot water storage tank 1 and the hot water boundary layer height level in the piping near the mixing valve 1 are balanced with the same height level. 7 was mixed with water on the water supply side in the mixing tank 22 to prevent overshoot and undershoot of the mixed hot water temperature when re-watering.
Japanese Patent Laid-Open No. 2003-4303

  However, in this conventional system, the high-temperature water flowing into the mixing tank 22 collides with the mixing promoting plate 23 and is mixed only on the mixing valve 7 side of the mixing tank 22, and the capacity of the hot water storage tank 22 is effectively used. It was not possible to effectively prevent overshoot of the mixed hot water temperature during re-heating.

  In addition, if the amount of hot water storage is large and the hot water supply stoppage time is long, the mixing tank 22 may be filled with high-temperature water. There was a problem of shooting.

Accordingly, in order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water supply pipe for supplying hot water in the hot water storage tank, and the water supply. A hot water supply bypass pipe for bypassing the hot water storage tank from a pipe, a mixing valve for mixing hot water from the hot water supply pipe and water from the water supply bypass pipe, a mixing pipe for supplying hot water mixed by the mixing valve, and A mixing tank disposed on the water supply bypass pipe side of the mixing valve, and mixing the hot water flowing in from the hot water side of the mixing valve with the water stored in the mixing tank in type storage type water heater, in the mixing tank, the diversion tube for guiding a portion of the hot water coming flows in the counter-mixing valve side of the mixing tank is arranged, the guiding flow tube, prior to It is provided with a flow resistance member that prevents the hot water flow to the mixing valve side.

Further, in claim 2, a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water supply pipe for supplying hot water in the hot water storage tank, and a hot water supply bypass for bypassing the hot water storage tank from the water supply pipe A mixing valve for mixing hot water from the hot water supply pipe and water from the water supply bypass pipe, a mixing pipe for supplying hot water mixed by the mixing valve, and the water supply bypass pipe side of the mixing valve A hot water mixing type hot water storage hot water heater that mixes the hot water flowing from the hot water side of the mixing valve and the water stored in the mixing valve in the mixing tank. to the diversion tube for guiding a portion of the hot water coming flows in the counter-mixing valve side of the mixing tank was placed, heated to the mixing tank from the guiding flow tube of the mixing tank Of the temperature sensor to a position near where the are mixed water arranged, it is based on the detected temperature of the temperature sensor when the hot water supply is stopped as provided with standby control means for controlling an opening degree of the mixing valve.

Further, in claim 3, a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water supply pipe for supplying hot water in the hot water storage tank, and a hot water supply bypass for bypassing the hot water storage tank from the water supply pipe A mixing valve for mixing hot water from the hot water supply pipe and water from the water supply bypass pipe, a mixing pipe for supplying hot water mixed by the mixing valve, and the water supply bypass pipe side of the mixing valve A hot water mixing type hot water storage hot water heater that mixes the hot water flowing from the hot water side of the mixing valve and the water stored in the mixing valve in the mixing tank. to the diversion tube for guiding a portion of the hot water coming flows in the counter-mixing valve side of the mixing tank is arranged, the guiding flow tube interfere the hot water flow to the mixing valve side And a temperature sensor is disposed in the vicinity of the position where the hot water from the flow guide pipe of the mixing tank and the water in the mixing tank are mixed, and based on the temperature detected by the temperature sensor when hot water supply is stopped. And standby control means for controlling the opening of the mixing valve .

  Further, in claim 4, a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a heater for heating water in the hot water storage tank, and a hot water supply pipe for supplying hot water in the hot water storage tank; A hot water supply bypass pipe that bypasses the hot water storage tank from the water supply pipe, a mixing valve that mixes hot water from the hot water supply pipe and water from the water supply bypass pipe, and a mixing pipe that supplies hot water mixed by the mixing valve And a mixing tank disposed on the water supply bypass pipe side of the mixing valve, and in this mixing tank, hot water flowing from the hot water side of the mixing valve and water stored therein are mixed. In a hot water / water mixing type hot water heater, a temperature sensor is disposed in the mixing tank, and the opening of the mixing valve is controlled based on the temperature detected by the temperature sensor when hot water supply is stopped. Is provided with a standby control means for.

  According to a fifth aspect of the present invention, the standby control unit is configured to decrease the opening degree of the mixing valve in the hot water side and increase the opening degree of the water side as the temperature detected by the temperature sensor increases. It is intended to control.

  According to the present invention, the flow guide pipe that guides a part of the inflowing hot water to the anti-mixing valve side of the mixing tank is arranged in the mixing tank, so that even when the mixing valve is open when hot water supply is stopped The high-temperature water that flows from the hot water supply pipe to the water supply bypass pipe side can be mixed with the water in the mixing tank on the mixing valve side and the anti-mixing valve side of the mixing tank, so the capacity of the mixing tank can be used effectively, Overshoot and undershoot can be reduced.

  In addition, since the flow resistance body that prevents the flow to the mixing valve side is provided in the flow guide pipe, high-temperature water staying in the flow guide pipe at the time of re-bathing does not flow out to the mixing valve at once. Since the surrounding warm water is preferentially discharged, overshooting and undershooting during re-watering can be reliably prevented.

  In addition, a temperature sensor is arranged in the mixing tank, and the opening of the mixing valve when the hot water supply is stopped is controlled based on the temperature detected by the temperature sensor, so that the temperature in the mixing tank is raised to an appropriate temperature or higher. It is possible to prevent overshoot during re-bathing.

Next, an embodiment of the present invention will be described with reference to FIGS.
In addition, about the structure same as a prior art example, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  24 is a mixing tank having a capacity of about 1 liter provided on the water side of the mixing valve 7, and flows into the water side from the low temperature water stored in the mixing tank 22 and the hot water side of the mixing valve 7 when hot water supply is stopped. The temperature is lowered to a relatively safe temperature by mixing hot hot water.

  Reference numeral 25 denotes a flow guide pipe provided in the mixing tank 24, and guides a part of high-temperature water flowing from the mixing valve 7 side to the anti-mixing valve side in the mixing tank 22 through the flow guide pipe 25. The other part is led to the mixing valve 7 side in the mixing tank 24.

  A flow resistor 26 is provided in the flow guide tube 25 and prevents the flow of hot water to the mixing valve 7 in the flow guide tube 25. Here, the flow resistor 26 is composed of a seat valve that cannot be completely closed. is there.

  Reference numeral 27 denotes a temperature sensor disposed on the side of the diversion pipe 25 in the mixing tank 24 on the side opposite to the mixing valve, which detects the temperature of hot water in the mixing tank 24.

  Reference numeral 28 denotes standby control means for controlling the opening degree of the mixing valve 7 during standby in the hot water supply stop state, to which the temperature detected by the temperature sensor 27 is input. The standby control means 28 is provided as a function of the control means 21 mainly composed of a microcomputer for controlling the water heater.

  Here, the operation of this embodiment will be described again. As shown by a broken line in FIG. 1, a large amount of hot water is stored in the hot water storage tank 1 below the capacity of the hot water storage tank 1 and the hot water boundary layer height level is high. When the mixing valve 7 is at a level lower than that of the mixing valve 7 and the mixed hot water temperature is high and a large amount of hot water in the hot water storage tank 1 is used, the difference in specific gravity between the hot water and the water and the hot water due to the water supply to the bottom of the hot water storage tank 1 The hot water flows into the water supply bypass pipe 6 on the water side of the mixing valve 7 due to the inertia force of pushing up, but a mixing tank 24 is provided on the water side of the mixing valve 7. The high temperature water that has flowed into the tank 24 is mixed with the low temperature hot water stored in the mixing tank 22.

  At this time, a part of the high-temperature water flowing into the mixing tank 24 flows to the anti-mixing valve side of the mixing tank 24 through the flow guide pipe 25 and mixes with the low-temperature hot water stored in the mixing tank 24. In addition, the other part is mixed with the low temperature hot water stored in the mixing tank 24 on the mixing valve 7 side of the flow guide tube 25. For this reason, the high-temperature water which goes around from the hot water supply pipe 4 side to the water supply bypass pipe 6 side is effectively used the capacity of the mixing tank 24 to obtain medium-temperature water in which the temperature of the entire area around the flow guide pipe 25 of the mixing tank 24 is lowered. This medium temperature water flows into the mixing valve 7 at the initial stage of re-bathing, so that overshoot and undershoot during re-bathing can be reduced.

  Moreover, since the flow resistance body which prevents the flow to the mixing valve 7 side of the hot water is provided in the flow guide pipe 25, the high temperature water flowing from the hot water supply pipe 4 when the hot water supply is stopped is on the anti-mixing valve side in the mixing tank 24. The high-temperature water that is guided smoothly and stays in the flow guide pipe 25 at the time of re-draining flows little by little to the mixing valve 7 side even if there is water supplied from the water supply bypass pipe 6 due to the check action of the flow resistor 26. Therefore, the medium temperature water around the flow guide pipe 25 in the mixing tank 24 is preferentially discharged at the time of re-watering, and the high temperature water staying in the flow guide pipe 25 does not flow out to the mixing valve 7 side at once. Overshoot and undershoot during re-bathing can be reliably prevented.

  A temperature sensor 27 is disposed in the mixing tank 24, and the opening degree of the mixing valve 7 when the hot water supply is stopped is controlled by the standby control means 28 based on the temperature detected by the temperature sensor 27. When the temperature exceeds a predetermined appropriate temperature (relatively safe temperature of about 30 to 45 degrees Celsius), the opening degree is controlled in the direction in which the hot water side of the mixing valve 7 is closed and the water side is opened. As a result, the temperature in the mixing tank 24 can be kept below an appropriate temperature, and overshooting during re-bathing can be reliably prevented.

  Further, when the temperature control unit 27 detects that the temperature in the mixing tank 24 is lower than a predetermined optimum temperature (a relatively safe temperature of about 30 to 45 degrees Celsius), the standby control means 28 detects the hot water of the mixing valve 7. The opening degree is also controlled in the direction of closing the water side in the direction of opening the side. As a result, the temperature in the mixing tank 24 can be maintained within an appropriate temperature range, and undershoot during re-draining can be reliably prevented.

  Here, the position where the temperature sensor 27 is provided is in the vicinity of the position where the hot water from the flow guide pipe in the mixing tank 24 and the water in the mixing tank are mixed, so that the medium temperature water in the mixing tank 24 is mixed. The temperature can be reliably detected, the reliability of the opening control of the mixing valve 7 when the hot water supply is stopped by the standby control means 28 is improved, and overshoot and undershoot at the time of re-watering can be prevented accurately and reliably. it can.

Next, another embodiment of the present invention will be described with reference to FIG.
In addition, about the same structure as a prior art example and previous one embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  Here, a temperature sensor 27 is provided in the mixing tank 24, and the standby control means 28 controls the opening degree of the mixing valve 7 in accordance with the temperature detected by the temperature sensor 27. .

    The standby control means 28 controls the opening degree of the mixing valve 7 when the hot water supply is stopped based on the temperature detected by the temperature sensor 27, so that the temperature in the mixing tank 24 is a predetermined appropriate temperature (about 30 to 45 degrees Celsius). When the temperature exceeds a relatively safe temperature), the opening degree is controlled in the direction in which the hot water side of the mixing valve 7 is closed and the water side is opened. As a result, the temperature in the mixing tank 24 can be kept below an appropriate temperature, and overshooting during re-bathing can be reliably prevented.

  Further, when the temperature control unit 27 detects that the temperature in the mixing tank 24 is lower than a predetermined optimum temperature (a relatively safe temperature of about 30 to 45 degrees Celsius), the standby control means 28 detects the hot water of the mixing valve 7. The opening degree is also controlled in the direction of closing the water side in the direction of opening the side. As a result, the temperature in the mixing tank 24 can be maintained within an appropriate temperature range, and undershoot during re-draining can be reliably prevented.

  As described above, according to the present invention, it is possible to suppress the overshoot width of the mixed hot water temperature at the initial stage of re-draining, and the difference between the hot water temperature in the mixing tank 24 and the supply water temperature is small even after the medium hot water has been discharged. Both the chute and the subsequent overshoot can be suppressed, and the control of the mixed hot water temperature can be stabilized.

  In this embodiment and the previous embodiment as well, the capacity of the mixing tank 24 is equal to or greater than (minimum water flow amount × time required for the mixing valve to be rotated after water flow detection) at the time of hot water supply, and (maximum water flow amount × It is desirable that the time required from the detection of water flow to the rotation of the mixing valve is less than or equal to.

  Further, a small hole is provided in the axial direction of the flow guide tube 25 so that high-temperature water mixes with water stored in the mixing tank 24 from a place other than the end of the flow guide tube 25. Good.

  Further, the flow resistance 26 in the flow guide pipe 25 is not limited to the one having a non-return action. For example, if the flow resistance in the flow guide pipe 25 such as an orifice or a throttle is increased, hot water supply is stopped. Sometimes hot water from the hot water supply pipe 4 side can flow out to the anti-mixing valve side of the flow guide pipe 25 by a gentle flow, and at the time of re-heating, the flow in the flow guide pipe 25 is restricted by an orifice or a throttle. The feed water flows through the portion of the mixing tank 24 that easily flows (around the flow guide pipe 25), the medium-temperature water around the flow guide pipe 25 flows out first, and the high-temperature water in the flow guide pipe 25 flows out gradually. Overshoot and undershoot during re-bathing can be prevented accurately and reliably.

  As mentioned above, although this invention has been demonstrated based on one Embodiment shown on drawing, this invention is not limited to this one Embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, the heater 12 may be not only a heat-pump type but also an electric heater that heats directly in the hot water storage tank 1, and the mixing valve 7 has a driving device on each water side hot water side or a wax pellet type mixing. A valve may be used. Further, the capacities of the hot water storage tank 1 and the mixing tank 22 are not limited to the illustrated capacities, and only need to be appropriate capacities according to individual designs.

The schematic block diagram which shows one Embodiment of this invention. Sectional drawing of the principal part of the same embodiment. The schematic block diagram which shows other one Embodiment of this invention. The schematic block diagram of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 4 Hot water supply pipe 6 Water supply bypass pipe 7 Mixing valve 9 Mixing pipe 24 Mixing tank 25 Current transfer pipe 26 Flow resistance body 27 Temperature sensor 28 Standby control means

Claims (5)

A hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water supply pipe for supplying hot water in the hot water storage tank, a hot water supply bypass pipe for bypassing the hot water storage tank from the water supply pipe, and the hot water supply pipe A mixing valve that mixes the hot water and water from the water supply bypass pipe, a mixing pipe that supplies hot water mixed by the mixing valve, and a mixing tank that is disposed on the water supply bypass pipe side of the mixing valve The hot water flowing into the mixing tank in the hot water mixing type hot water heater is designed to mix the hot water flowing from the hot water side of the mixing valve with the water stored in the mixing tank. the part arranged diversion pipe that leads to the counter-mixing valve side of the mixing tank, the guide flow tube, the flow resistance element is provided to prevent the hot water flow to the mixing valve side Hot and cold water mixing-type hot water storage type water heater, characterized in that. A hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water supply pipe for supplying hot water in the hot water storage tank, a hot water supply bypass pipe for bypassing the hot water storage tank from the water supply pipe, and the hot water supply pipe A mixing valve that mixes the hot water and water from the water supply bypass pipe, a mixing pipe that supplies hot water mixed by the mixing valve, and a mixing tank that is disposed on the water supply bypass pipe side of the mixing valve The hot water flowing into the mixing tank in the hot water mixing type hot water heater is designed to mix the hot water flowing from the hot water side of the mixing valve with the water stored in the mixing tank. some of placing the diversion pipe that leads to the counter-mixing valve side of the mixing tank, the hot water from the guiding flow tube of the mixing tank and water in the mixing tank are mixed A temperature sensor disposed in置近near, the hot and cold water mixing type storage type water heater, characterized in that a standby control means for controlling an opening degree of the mixing valve based upon the hot water supply is stopped at the detection temperature of the temperature sensor. A hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water supply pipe for supplying hot water in the hot water storage tank, a hot water supply bypass pipe for bypassing the hot water storage tank from the water supply pipe, and the hot water supply pipe A mixing valve that mixes the hot water and water from the water supply bypass pipe, a mixing pipe that supplies hot water mixed by the mixing valve, and a mixing tank that is disposed on the water supply bypass pipe side of the mixing valve The hot water flowing into the mixing tank in the hot water mixing type hot water heater is designed to mix the hot water flowing from the hot water side of the mixing valve with the water stored in the mixing tank. the part arranged diversion pipe that leads to the counter-mixing valve side of the mixing tank, the guide flow tube, the flow resistance element is provided to prevent the hot water flow to the mixing valve side A temperature sensor is arranged in the vicinity of the position where the hot water from the flow guide pipe of the mixing tank and the water in the mixing tank are mixed, and the opening of the mixing valve is based on the temperature detected by the temperature sensor when hot water supply is stopped. A hot water / water mixing type hot water storage type hot water heater characterized by comprising standby control means for controlling the temperature.   A hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a heater for heating water in the hot water storage tank, a hot water supply pipe for supplying hot water in the hot water storage tank, and the hot water storage from the water supply pipe A hot water supply bypass pipe for bypassing the tank, a mixing valve for mixing hot water from the hot water supply pipe and water from the water supply bypass pipe, a mixing pipe for supplying hot water mixed by the mixing valve, and the mixing valve A hot water mixing type hot water storage type hot water heater comprising a mixing tank disposed on the side of the water supply bypass pipe, wherein the hot water flowing from the hot water side of the mixing valve and the water stored therein are mixed in the mixing tank And a standby control means for disposing a temperature sensor in the mixing tank and controlling the opening of the mixing valve based on a temperature detected by the temperature sensor when hot water supply is stopped. Hot and cold water mixing-type hot water storage type water heater, characterized in that digit. The standby control means controls the mixing valve in such a direction that the opening degree on the hot water side decreases and the opening degree on the water side increases as the temperature detected by the temperature sensor increases. The hot and cold mixed hot water storage hot water heater according to any one of claims 2 to 4 .

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