JP2005351511A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater capable of recovering the original hot water temperature in a short time even when the temperature of the hot water near a heat exchanger for reheating in a hot water storage tank is lowered by a bath reheating operation or the like. <P>SOLUTION: A boil-up circulation passage 11 is mounted to circulate the hot water in the hot water storage tank 5 from a hot water supply pipe 10 at an upper part from a water supply pipe 9 at a lower part in the hot water storage tank 5. A heat pump device 3 is mounted for boiling up the water flowing in the boil-up circulation passage 11. The heat exchanger for reheating 24 is mounted at the upper part in the hot water storage tank 5 to absorb the heat in the hot water storage tank 5. A reheating circulation passage 25 is provided with a reheating circulation pump 26 for circulating the heat from the reheating heat exchanger 24 to a bath tub. The hot water supply pipe 10 is mounted near the outer wall of the hot water storage tank 5 provided with the reheating heat exchanger 24. The hot water is stored from the neighborhood of an outer wall of the hot water storage tank 5 provided with the reheating heat exchanger 24 to recover the temperature of the hot water near the reheating heat exchanger 24 to the original hot water temperature in a short time in reheating. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hot water supply apparatus capable of heating bathtub water using hot water stored in a hot water storage tank of an electric water heater.

  Conventionally, a hot water supply device that uses the hot water stored in a hot water storage tank of a hot water storage heater to keep the bathtub water warm or reheat the hot water in the hot water tank is taken out from the lower part of the hot water tank, and the extracted hot water is boiled. Circulating means is provided that circulates by a raising pump, and heats the hot water in turn by a heating means such as a heat pump to boil it in layers from the upper part of the hot water storage tank. And when this hot water circulation means is operated to boil up the total amount of hot water in the hot water storage tank, this hot water is filled in the bathtub, and when the hot water in the bathtub drops when not in use or bathing for a long time, A bath water circulation means composed of a heat exchange means and a bath water pump provided in the upper part of the hot water storage tank is operated, and the heat exchange means that absorbs the heat of the hot water in the hot water storage tank is made to exchange the heat of circulation of the bath water. The water was kept warm and memorial.

  However, according to such a hot water supply device, the temperature of the hot water in the upper part of the hot water storage tank where the heat exchanging means is located is particularly lowered when the temperature of the bath water is maintained or the reheating is performed. Therefore, there is a problem that if the temperature of the hot water is lowered and the bath water is kept warm or the remedy is heated again, the remedy takes time or the remedy cannot be performed.

Therefore, if the hot water temperature in the upper part of the hot water storage tank where the remedy heat exchanger is located decreases, the hot water circulation means is operated again to bring it up from the upper part of the hot water storage tank. The hot water at the top was returned to the original hot water temperature.
(For example, refer to Patent Document 1).
Japanese Patent Laying-Open No. 2003-166751 (page 1-6, FIG. 1)

  However, according to such a conventional hot water supply apparatus, the hot water that returns the original hot water temperature to the original hot water temperature at the location where the heat exchanger for bath additional heat that has been lowered due to the heat retention or the additional heating of the bath water is provided. The mounting position of the circulating means on the hot water supply pipe side on the hot water supply piping side is attached to the top of the hot water storage tank away from the heat exchanging means, so the distance from the heat exchanging means becomes long, and the heat exchanger for remedy is located. There is a problem that the hot water temperature of the part to be performed cannot be quickly returned to the original hot water temperature in a short time.

  The present invention has been made in view of the above points, and the hot water temperature of the portion where the heat exchanger for remedy, which has been lowered by performing the heat insulation or the remedy heating of the bath water, is quickly changed to the original hot water temperature. An object is to provide a hot water supply device that can be returned.

  A hot water supply apparatus according to claim 1, a hot water storage tank, a water supply pipe for taking out water in the hot water storage tank from a lower part, a hot water supply pipe for supplying the water to the upper part of the hot water storage tank, and a circulation pump for circulating the water A boiling circulation path consisting of: a heat pump device for boiling running water in the boiling circulation path; a heat exchanger for reheating that is disposed in the upper part of the hot water storage tank and absorbs heat in the hot water storage tank; In the hot water supply apparatus comprising a hot water circulation circuit comprising a bathtub water circulation pump for circulating heat from the hot water heat exchanger to the bathtub, the hot water heat exchanger for the hot water supply pipe of the boiling circuit is It is attached to the outer wall of the hot water storage tank corresponding to the disposed position.

  And in this structure, the hot water temperature of the site | part in which the heat exchanger for remedy lowered | hung by performing the heat retention or the remedy heating of bath water can be quickly returned to the original hot water temperature, It is prepared for heat insulation and memorial heating.

  A hot water supply apparatus according to claim 2, a hot water storage tank, a water supply pipe for taking out the water in the hot water storage tank from the lower part, a supply pipe for supplying the water to the upper part of the hot water storage tank, and a circulation pump for circulating the water A boiling circulation path consisting of: a heat pump device for boiling running water in the boiling circulation path; a heat exchanger for reheating that is disposed in the upper part of the hot water storage tank and absorbs heat in the hot water storage tank; A hot water supply apparatus comprising a recirculation circuit comprising a recirculation circulation pump that circulates heat from the recuperation heat exchanger to the bathtub, and a supply pipe for the boiling circulation path is disposed in the hot water storage tank. In addition, it extends to the vicinity of the heat exchanger for remedy.

  And in this structure, the hot water temperature of the site | part in which the heat exchanger for remedy lowered | hung by performing the heat retention or the remedy heating of bath water can be quickly returned to the original hot water temperature, It is prepared for heat insulation and memorial heating.

  The hot water supply device according to claim 3 is the hot water supply device according to claim 1 or 2, wherein a remaining hot water amount detection sensor is provided in the vicinity of the outer wall of the hot water storage tank in which the heat exchanger for reheating is disposed, and the remaining hot water amount detection sensor. When the amount of remaining hot water is detected below a predetermined amount, the heat pump device is operated.

  In this configuration, the heat pump device is automatically operated only when the remaining hot water amount detection sensor detects that the hot water storage hot water temperature of the portion where the heat exchanger for replenishment is disposed is equal to or lower than a predetermined temperature, Since hot water is stored in hot water, wasteful power consumption can be suppressed.

  According to the hot water supply apparatus of the first aspect, the hot water temperature at the portion where the heat exchanger for the remedy, which has been lowered due to the heat insulation or the remedy heating of the bath water, can be quickly returned to the original hot water temperature. It is prepared for reheating the bath water and reheating.

  According to the hot water supply apparatus of claim 2, the hot water temperature of the portion where the heat exchanging means, which has been lowered by performing the warming or reheating of the bath water, can be quickly returned to the original hot water temperature. It is prepared for heat retention and memorial heating of bath water.

  According to the hot water supply device of the third aspect, in addition to the effect of the hot water supply device of the first or second aspect, the heat pump device is operated only when the remaining hot water amount detection sensor detects that the remaining hot water amount is a predetermined amount or less. In addition, since hot water is stored in the hot water in the hot water storage tank of the part where the heat exchanger for remedy is disposed, wasteful power consumption can be suppressed.

  Examples of the present invention will be described below.

  A first embodiment of a hot water supply apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram illustrating Example 1 of the hot water supply apparatus of the present invention.

  In FIG. 1, a hot water supply device 1 includes a hot water storage device 2, a heat pump device 3, and a bath chasing device 4.

  The hot water storage device 2 includes a hot water storage tank 5, and the hot water storage tank 5 employs a first-stop push-up type hot water supply method, and a water supply pipe that supplies tap water to a lower portion of the hot water storage tank 5 via a pressure reducing valve 6. 7 is connected, and a hot water supply pipe 8 for supplying hot water to a hot water supply destination such as a kitchen or a bathtub is connected to the upper part.

  The hot water storage tank 5 includes a hot water supply pipe 10 that exits from a water supply pipe 9 connected to the lower part of the hot water storage tank 5 and returns to a position corresponding to an upper side wall (a heat exchanger for reheating described later) of the hot water storage tank 5. A circulation path 11 is connected. Further, an intermediate portion of the boiling circulation path 11 exits from the hot water storage device 2 and is disposed in the heat pump device 3, and the water in the lower portion of the hot water storage tank 5 is forced through the water supply pipe 9 in the heat pump device 3. And a circulation pump 12 that circulates through the supply pipe 10 connected to the upper side wall of the hot water storage tank 5 and a part of the heat exchanger 13 that boils the water circulating in the boiling circulation path 11. A water heat exchanger 14 is provided.

  Further, on the outer wall of the hot water storage tank 5, the hot water temperature in the hot water storage tank 5 is detected at a height position corresponding to each remaining hot water amount of 60L, 120L, 180L and 350L in the hot water storage tank 5 in order from the upper side. Temperature sensors S1, S2, S3, and S4 are provided as remaining hot water amount detecting means for detecting the remaining hot water amount, and hot water for detecting the temperature of the hot water supply to the hot water storage tank 5 and the hot water temperature when the entire amount is heated is provided on the lower side. A temperature sensor S5 is provided.

  The heat pump device 3 has a refrigerant circulation path 15 filled with a refrigerant. The refrigerant circulation path 15 is a four-way valve 17 that is used by reversing the flow direction of the refrigerant during the defrosting operation of the compressor 16 and the evaporator. Refrigerant heat exchange which forms part of heat exchange 13 which functions as a condenser and heats hot water flowing through the boiling circulation path 11 with the water heat exchanger 14 to bring it to a predetermined boiling temperature. An evaporator 18, an expansion valve 19 and an evaporator 20 as a heat collector are connected in order. The evaporator 20 includes a blower fan 21 and a blower motor 22 that rotationally drives the blower fan 21.

  The bath remedy device 4 connects the tub 23 and the heat exchanger 24 for remedy disposed in the upper part of the hot water storage tank 5 and the tub 23 and the heat exchanger 24 for heat remedy. It comprises a memorial circuit 25 that circulates and heats hot water. The memorial circulation path 25 includes a memorial circulation pump 26, a three-way valve 27 for switching between hot water filling the bathtub 23 and the memorial circulation path 25, a bath water temperature detection sensor 28, and the like. Reference numeral 29 denotes a mixing valve for bathing hot water, which has a function of mixing hot water from the water supply pipe 7 and hot water from the hot water storage tank 5 to supply hot water at an appropriate temperature to the bathtub 23. Reference numeral 30 denotes a hopper which has a function of separating the mixing valve 29 and the bathtub 23 when the water supply pressure is lowered due to water cut or the like.

  Reference numeral 31 denotes a control device. The control device 31 circulates hot water in the boiling circulation path 11 and operates the heat pump device 3 to perform boiling control of hot water in the hot water storage tank 5, or a three-way valve 27. The bath 23 is filled with hot water by appropriately switching, or the remedy circulation path 25 is operated to heat the hot water in the tub 23.

  Next, the operation of the first embodiment will be described.

  First, the operation of boiling hot water in the hot water storage tank 5 to store hot water will be described with reference to FIG.

  Tap water is stored in the hot water storage tank 5 from the water supply pipe 7. When the hot water storage command is issued by the control device 31, the compressor 16 is driven. Thereby, as shown by the arrow, the refrigerant flows in the order of the compressor 16, the four-way valve 17, the refrigerant heat exchanger 18 as a condenser, the expansion valve 19, and the evaporator 20. At the same time, the blower motor 22 is driven to rotate the blower fan 21 to collect atmospheric heat by the evaporator 20 and the vaporized refrigerant is sent to the compressor 16, and the high-temperature and high-pressure refrigerant gas compressed by the compressor 16 is refrigerant heat. Heat is exchanged with the water heat exchanger 14 by the exchanger 18.

  On the other hand, the circulation pump 12 of the boiling circulation path 11 is driven, and the hot water in the lower part of the hot water storage tank 5 passes through the water supply pipe 9 of the boiling circulation path 11 and the water heat exchanger 14 and the refrigerant heat exchanger 18 as shown by arrows. The hot water is exchanged between the hot water and the hot water supply pipe 10 through the hot water supply pipe 10 to enter the portion where the heat exchanger 24 for bath remedy on the side wall of the hot water storage tank 5 is located. The hot water in the hot water storage tank 5 is boiled up, and the boiling is repeated until the sensor S5 detects the whole amount of water. And the hot water laminated | stacked in the hot water storage tank 5 in this way is sent to the kitchen or the bathtub 23 through the hot water supply pipe 8, for example.

  Next, the hot water filling action on the bathtub 23 will be described with reference to FIG.

  When a hot water filling command is issued from the control device 31, the three-way valve 27 is switched as indicated by an arrow, and hot hot water in the hot water storage tank 5 enters the mixing valve 29. On the other hand, tap water enters the mixing valve 29 through the water supply pipe 7, and hot water mixed at an appropriate temperature by the mixing valve 29 is filled in the bathtub 23.

  Next, the operation of the automatic heat retaining operation or the memorial heating operation will be described with reference to FIG.

  First, an automatic heat retaining operation or a memorial heating operation for confirming the hot water temperature in the bathtub 23 at regular intervals and keeping the hot water temperature constant will be described. That is, the three-way valve 27 is switched to the side of the memorial circuit 25 and the memorial circuit pump 26 is driven at regular intervals to circulate hot water in the bath 23 in the memorial circuit 25 as shown by the arrow. The hot water temperature is monitored by the temperature detection sensor 28. When the hot water in the bathtub 23 has not been used for a long time or the hot water temperature has decreased due to bathing, the bath water temperature detection sensor 28 detects a predetermined hot water temperature or lower. By this detection, the hot water circulation pump 26 is driven until the hot water temperature returns to the predetermined hot water temperature, and the bath water is kept warm or heated. That is, as the bathtub water circulates in the recuperation heat exchanger 24, the heat of the recuperation heat exchanger 24 that has absorbed the heat of the hot water in the hot water storage tank 5 and the hot water in the bathtub 23 exchange heat. The hot water in the bathtub 23 is warmed or reheated, and the bathtub water is returned to a predetermined hot water temperature.

  On the other hand, when the automatic heat retaining operation or the memorial heating operation is performed, the hot water temperature in the vicinity of the memorial heat exchanger 24 in the hot water storage tank 5 is lowered. When the hot water temperature in the hot water storage tank 5 in the vicinity of the reheating heat exchanger 24 falls below a predetermined predetermined hot water temperature, the remaining provided on the outer wall of the hot water storage tank 5 where the reheating heat exchanger 24 is located. The hot water amount detection sensor S2 detects the decrease in the hot water temperature, the hot pump 3 is automatically operated, and hot water is stored from the outer wall of the hot water storage tank 5 where the heat exchanger 24 for remedy is located through the hot water supply pipe 10 of the boiling circuit 11. The amount of heat consumed by the endothermic heat exchanger 24 is quickly replenished in a short time. Therefore, it is possible to prepare for the next memorial heating operation without any trouble.

  FIG. 5 is a configuration diagram of a hot water supply apparatus according to Embodiment 2 of the present invention. About each part of this Example 2, the same part as each part of the hot water supply apparatus of Example 1 of FIG. 1 is shown with the same code | symbol. The difference between the second embodiment and the second embodiment is that the hot water supply pipe 10 of FIG. 1 is attached to the outer wall of the hot water storage tank 5 where the heat exchanger 24 for reheating of the hot water storage tank 5 is located. It is in the structure extended from the upper part of the tank 5 to the vicinity of the heat exchanger 24 for entering and chasing.

  Even in this configuration, when the hot water in the bathtub 23 has not been used for a long time or the hot water temperature has decreased due to bathing, when the bath water temperature detection sensor 28 detects a temperature below a predetermined hot water temperature, the hot water temperature is determined by this detection. The remedy circulation pump 26 is driven until the temperature returns to the hot water temperature, and the bath water is kept warm or remedy.

  According to the second embodiment described above, similarly to the first embodiment, the amount of heat consumed by the endothermic heat exchanger 24 can be quickly replenished in a short time, and can be prepared without any trouble for the next remedy heating operation or the like. .

It is a lineblock diagram showing one embodiment of a hot-water supply device of the present invention. It is explanatory drawing explaining the effect | action at the time of the hot water storage driving | operation of a hot-water supply apparatus same as the above. It is explanatory drawing explaining the effect | action at the time of hot water filling operation of a hot-water supply apparatus same as the above. It is explanatory drawing explaining the effect | action at the time of the thermal insulation of a hot-water supply apparatus or a chasing operation same as the above. It is explanatory drawing explaining the effect | action at the time of the structure of 2nd Embodiment of a hot-water supply apparatus, and heat retention or a chasing operation same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply apparatus 2 Hot water storage apparatus 3 Heat pump apparatus 4 Bath remnant apparatus 5 Hot water storage tank 9 Water supply piping 10 Hot water supply piping 11 Circulation path for boiling 12 Circulation pump 13 Heat exchanger 23 Bathtub 24 Heat exchanger 25 for bath recuperation 25 Recirculation circulation Path 26 Remembrance circulation pump 27 Three-way valve 28 Bath water temperature detection sensor 31 Control device S1, S2, S3, S4 Remaining hot water amount detection sensor

Claims (3)

  A hot water storage tank, a hot water supply pipe for taking out the water in the hot water storage tank from the lower part, a hot water supply pipe for supplying the water to the upper part of the hot water storage tank, and a circulation circuit for boiling, comprising a circulation pump for circulating the water, A heat pump device for boiling the running water in the boiling circulation path, a heat exchanger for reheating disposed in the upper part of the hot water storage tank to absorb heat in the hot water storage tank, and heat from the heat exchanger for reheating In the hot water supply apparatus provided with a recirculation circuit comprising a bath water circulation pump for circulating the water in the bathtub, the hot water storage pipe corresponding to the position where the recuperation heat exchanger is located in the hot water supply pipe of the boiling circuit A hot water supply device attached to the outer wall of the tank.   A hot water storage tank, a hot water supply pipe for taking out the water in the hot water storage tank from the lower part, a hot water supply pipe for supplying the water to the upper part of the hot water storage tank, and a circulation circuit for boiling, comprising a circulation pump for circulating the water, A heat pump device for boiling running water in the boiling circulation path, a recuperation heat exchanger disposed in the upper part of the hot water storage tank for absorbing heat in the hot water storage tank, and heat from the reheating heat exchanger In a hot water supply apparatus comprising a water circulation path composed of a recirculation circulation pump that circulates in a bathtub, the hot water supply pipe of the boiling circulation path is extended to the vicinity of the recuperation heat exchanger disposed in the hot water storage tank. A hot water supply apparatus characterized by being provided.   When a remaining hot water amount detection sensor is mounted in the vicinity of the outer wall of the hot water storage tank in which the heat exchanger for remedy is disposed, and when the hot water temperature in the hot water storage tank at a portion where the remaining hot water amount detection sensor is detected is equal to or lower than a predetermined temperature, the heat pump The hot water supply apparatus according to claim 1 or 2, wherein the apparatus is operated.

Images