JP2014037962A - Storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type water heater of high usability, capable of performing optimum hot water supply control according to an installation situation.SOLUTION: A storage type water heater including a hot water storage tank 100 for storing hot water of high temperature, and heating means 1 for heating hot water/water in the hot water storage tank 100, and constituted to supply hot water to a bathtub 5, further includes a hot water pouring valve 9 for starting and terminating hot water supply to the bathtub 5, and a flow rate adjustment valve 10 for adjusting a hot water supply flow rate to the bathtub 5. As a first initial opening of the flow rate adjustment valve 10 in a hot water supply test operation or an initial hot water supply operation is smaller than a second initial opening of the flow rate adjustment valve 10 in a hot water supply operation after the hot water supply test operation or the initial hot water supply operation, the optimum hot water supply operation can be performed according to an installation situation.

Description

The present invention relates to a hot water storage type water heater, and more particularly, to control of hot water filling.

  FIG. 5 is a configuration diagram of a conventional hot water storage type water heater. As shown in FIG. 5, a water supply pipe 102 is connected to the bottom of the hot water storage tank 100 via a pressure reducing valve 120, and the low temperature water is supplied to the bottom of the hot water storage tank 100 by being decompressed (for example, Patent Documents). 1).

  However, since the water is supplied through the pressure reducing valve, there is a problem that the hot water supply pressure discharged from the faucet is low. More recently, there are many bathrooms on the 2nd and 3rd floors, and it is necessary to send hot water only from the hot water storage tanks installed outside to the 2nd and 3rd floors. Then, the hot water pressure on the 2nd and 3rd floors became low, and a hot water storage type water heater with a high water supply pressure was desired.

  In response to such market needs, hot water storage water heaters that supply water to hot water storage tanks without using pressure reducing valves have been developed. FIG. 6 is a configuration diagram of a high-pressure type hot water storage type hot water supply device. As shown in FIG. 6, in the high-pressure type hot water storage type hot water heater, water is supplied directly to the bottom of the hot water storage tank without using a pressure reducing valve, and it is sufficient to provide a hot water supply terminal such as a faucet on the upper floor such as the second or third floor. Satisfactory hot water pressure can be obtained.

  However, when filling from such a high-pressure type hot water storage type hot water supply machine, the water supply pressure to the hot water storage tank is high, so when the solenoid valve is opened during hot water filling, water is poured into the bathtub vigorously. Therefore, vibration is generated in the pipe and vibration noise is generated. Furthermore, if the solenoid valve is closed even when hot water filling is stopped, a large flow of water stops instantaneously, so that a water hammer effect is generated, vibrations are generated in the hot water supply pipe, and noise associated therewith is also generated.

  Therefore, in the high-pressure type hot water storage type hot water heater, in order to prevent the occurrence of such vibration, the following control is performed to prevent the occurrence of vibration. Hereinafter, the conventional high pressure type hot water filling control will be described.

  The hot water storage type water heater shown in FIG. 6 has a hot water storage tank 100 for storing hot water and heating means (for example, a heat pump unit) 101 for boiling hot water in the hot water storage tank 100, and a pressure reducing valve at the bottom of the hot water storage tank 100. The water supply pipe 102 is connected without going through. Then, hot water is supplied to each of the hot water supply terminal 104 and the bathtub 105 from the hot water discharge pipe 103 connected to the upper part of the hot water storage tank 100. Since the present invention relates to hot water filling in a bathtub, description of the hot water supply to a hot water supply terminal is omitted.

  The hot water discharged from the hot water outlet pipe 103 and the low temperature water supplied from the feed water branch pipe 106 branched from the feed water pipe 102 are mixed by the mixing valve 107 and provided downstream of the mixing valve 107. The mixing ratio of the mixing valve 107 is controlled so that the temperature sensor 108 reaches the set temperature. Further, between the bathtub 105 and the mixing valve, a pouring valve 109 for starting filling of the bathtub 105, a flow control valve 110 for adjusting the amount of filling, and a flow rate sensor 111 for detecting the flow rate are provided. ing.

At the start of hot water filling of the hot water storage type water heater configured as described above, hot water filling was started in a state where the flow control valve was opened to a predetermined opening (first predetermined opening). FIG. 7 is a diagram showing that the hot water flow rate to the bathtub changes with time. As shown in FIG. 7, hot water filling is started at a first predetermined opening, and then, after a predetermined time has elapsed, the flow control valve is fully opened to perform hot water filling.

  Then, when it is detected that the set amount of hot water has been filled by the flow rate sensor, the opening of the flow control valve is reduced from the fully open position to the first predetermined degree of opening, and the hot water is filled for a predetermined time. Thereafter, after a predetermined time has elapsed, the hot water filling valve is closed and the hot water filling is finished. In this way, in the case of a high-pressure type hot water storage type hot water heater, by changing the filling flow rate to the bathtub in two stages, the change in large flow rate is eliminated and the occurrence of water hammer action is prevented. Hot water filling can be performed without causing a large flow rate change.

JP 2007-85668 A

  However, when a bathroom is installed on the upper floor of the second or third floor, it is necessary to send hot water from the hot water storage tank to the upper floor. Therefore, compared to the case where a bathroom is provided on the first floor, a hot water storage type hot water heater Even so, the tapping pressure decreases. As a result, even in the case of a high-pressure type hot water storage type hot water heater, the hot water is sent to the upper floor, so the maximum flow rate falls to a water flow level that does not cause a water hammer effect. Regardless of the fact that it does not occur, the hot water filling control peculiar to the high pressure type hot water storage type hot water heater (control to fill the hot water by changing the flow rate in two stages) unnecessarily lengthens the hot water filling time. It had the problem that.

  This invention solves the said conventional subject, and it aims at providing the hot water storage type hot-water supply machine with high usability which can perform optimal hot-water filling control according to an installation condition.

  In order to solve the above-described conventional problems, a hot water storage type water heater of the present invention includes a hot water storage tank for storing high-temperature hot water, and a heating means for heating the hot water in the hot water storage tank, and is configured to be able to fill a bathtub with water. A hot water storage type water heater comprising a pouring valve for starting and ending hot water filling to the bathtub, and a flow rate adjusting valve for adjusting the hot water filling flow rate to the bathtub. The first initial opening degree of the flow rate adjusting valve in the hot water filling operation is smaller than the second initial opening degree of the flow rate adjusting valve in the hot water filling operation performed after the hot water filling test operation or the first hot water filling operation. It is a feature.

  Thereby, even if it is a high-pressure hot-water type hot-water storage type hot-water supply machine, optimal hot water filling operation can be performed according to installation conditions.

  INDUSTRIAL APPLICABILITY The present invention can provide a hot water storage type hot water heater that can perform optimum hot water filling control according to installation conditions.

The block diagram of the hot water storage type hot water heater in Embodiment 1 of this invention Flow rate change diagram during hot water filling test of this embodiment Flow rate change diagram during hot water filling operation of this embodiment (maximum flow rate is less than predetermined flow rate) Flow rate change diagram during hot water filling operation of this embodiment (maximum flow rate is greater than or equal to predetermined flow rate) Configuration diagram of a hot water storage type hot water heater via a conventional pressure reducing valve Configuration diagram of a conventional hot-water storage water heater without a pressure reducing valve Flow rate change diagram during conventional hot water operation

  A hot water storage type water heater according to a first aspect of the present invention is a hot water storage type hot water supply apparatus that includes a hot water storage tank that stores high-temperature hot water and heating means that heats the hot water in the hot water storage tank, and is configured to be able to fill a bathtub with hot water. And a pouring valve for starting and ending hot water filling to the bathtub and a flow rate adjusting valve for adjusting the hot water filling flow rate to the bathtub, and the flow rate adjusting valve in the hot water filling test operation or the first hot water filling operation. The first initial opening is smaller than the second initial opening of the flow rate adjusting valve in the hot water filling test operation or the hot water filling operation performed after the initial hot water filling operation. As a result, even with a high-pressure hot water storage type hot water storage type hot water supply machine, when the hot water pressure drops due to hot water filling up the floor, the hot water filling operation is changed accordingly. You can drive.

  Further, in the hot water storage type water heater of the second invention, in particular, in the first invention, the hot water flow rate when the flow rate adjustment valve is fully opened in the hot water filling test operation or the first hot water filling operation is The second initial opening is set to an opening at which the filling flow rate is smaller than the predetermined flow rate when the generated flow rate is equal to or higher than the predetermined flow rate. Since the flow regulating valve is opened to a predetermined flow rate and then fully opened, no water hammer effect occurs, and the second predetermined opening is larger than the first predetermined opening during the trial operation or the first hot water filling operation. Since the hot water filling starts, the hot water filling time can be shortened.

  Further, in the hot water storage type water heater of the third invention, particularly in the first invention, the hot water flow rate when the flow rate adjusting valve is fully opened in the hot water filling test operation or the first hot water filling operation is When the generated flow rate is less than the predetermined flow rate, the second initial opening is fully opened. As a result, it is not necessary to perform the hot water filling operation in two stages, and the hot water filling time is reduced. Can be shortened.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a hot water storage type water heater in the present embodiment. First, the configuration of the hot water storage type water heater of the present embodiment will be described with reference to FIG.

  As shown in FIG. 1, the hot water storage type water heater of the present embodiment has a hot water storage tank 100 for storing high-temperature hot water and heating means (for example, a heat pump unit) 1 for boiling hot water in the hot water storage tank 100. The first water supply pipe 2 is connected to the bottom of the tank 100 without a pressure reducing valve. Then, hot water is supplied to each of the hot water supply terminal 4 and the bathtub 5 from the hot water discharge pipe 3 connected to the upper part of the hot water storage tank 100.

  Then, the hot water discharged from the hot water discharge pipe 3 and the low temperature water supplied from the second water supply pipe 6 branched from the first water supply pipe 2 are mixed by the mixing valve 7 and provided on the downstream side of the mixing valve 7. The mixing ratio of the mixing valve 7 is controlled so that the temperature sensor 8 is set to the set temperature. Further, between the bathtub 5 and the mixing valve 7, there are a pouring valve 9 for starting filling of the bathtub 5, a flow rate adjusting valve 10 for adjusting the amount of filling, and a flow rate detecting means for detecting the flow rate. A flow sensor 11 is provided. In addition, in this Embodiment, although demonstrated using the hot water storage-type water heater comprised so that the hot water filling to the bathtub 5 is not limited to this, the hot water storage-type water heater of this invention is, In addition to the hot water filling operation, there is no problem even if it is a hot water storage type water heater configured so that it can be reheated using high temperature hot water in the hot water storage tank 100.

Next, hot water filling operation will be described. First, when the hot water storage type hot water heater of the present invention is installed, a trial operation is performed to check whether it operates without any problem. In this trial run, a boiling trial run to confirm whether the hot water in the hot water storage tank 100 can be completely boiled up, a hot water trial run to confirm whether the bath 5 can be normally filled with water, and further, the air in each pipe is used. It includes air venting operation to extract air, and the contractor always performs a trial operation.

  Next, the hot water filling test operation will be described. FIG. 2 is a diagram for explaining a hot water filling test operation. Since the hot water storage type water heater of the present invention is a high pressure type hot water storage type hot water heater in which the first water supply pipe 2 is connected to the bottom of the hot water storage tank 100 without a pressure reducing valve, the flow rate adjustment valve 10 is suddenly fully opened. When the hot water operation is performed, piping vibration and vibration noise are generated due to water impact. Therefore, during the hot water filling test operation, the hot water filling test operation is started so that the opening degree of the flow rate adjusting valve 10 becomes a predetermined initial opening degree (first predetermined opening degree). In addition, when the opening degree of the flow rate adjusting valve 10 is the first predetermined opening degree, the hot water filling test operation is started at a flow rate of about 5 L / min. Note that 5 L / min is a value calculated from an experiment or the like, and is not limited thereto.

  When the hot water filling test operation is started, the hot water filling test operation is started by opening the pouring valve 9, and after the hot water filling test operation is started, the first predetermined opening (for example, 5 seconds) is maintained at the first predetermined opening degree. Continue the hot water filling test. The first predetermined period is a period during which the temperature of the temperature sensor 8 is stabilized. Moreover, the hot water filling test operation can be performed without generating a water hammer sound by starting the hot water filling test operation with the first predetermined opening.

  Next, when the temperature detected by the temperature sensor 8 is stabilized, the flow rate adjustment valve 10 is driven fully open. At this time, the opening degree of the flow rate adjustment valve 10 is changed from the first predetermined opening degree to the fully open state over a second predetermined period (for example, 15 seconds). This is because if the opening degree of the flow regulating valve 10 is opened all the way to the full opening, the operation speed of the mixing valve 7 is increased, so that the driving speed is increased and the operation sound (water draining sound) is increased. Therefore, in order to prevent this, the opening degree of the flow rate adjustment valve 10 is driven to full open over a second predetermined period. In addition, when the opening degree of the flow rate adjusting valve 10 is fully opened, the hot water filling flow rate is about 18 L / min.

  When the flow rate sensor 11 detects that the set amount of hot water has been filled, at the end of the hot water filling test operation, as with the start of the hot water filling test operation, the flow rate adjustment valve 10 is opened to prevent draining noise. The degree is driven from fully open to the first predetermined opening over about 15 seconds. Then, for the first predetermined period (for example, 5 seconds), the opening degree of the flow rate adjusting valve 10 is set to the first predetermined opening degree, and then the hot water injection valve 9 is closed to end the hot water filling test operation. At this time, even when the hot water filling test operation is terminated, the opening degree of the flow rate adjusting valve 10 is set to the first predetermined opening amount for the first predetermined period. The first predetermined period may be different.

  In addition, when the hot water filling operation is ended, the hot water is poured at the first predetermined opening for the first predetermined time period in order to stabilize the temperature detected by the temperature sensor 8. As a result, the hot water filling operation is ended. The temperature of the hot water supplied to the bathtub 5 can be kept constant when the temperature sensor 8 is detected, and the temperature detected by the temperature sensor 8 is hunted so that the cold hot water is not supplied to the bathtub 5 and the hot water filling operation is not terminated. I am doing so.

  In this way, in the case of a high-pressure type hot water storage type hot water heater, by changing the filling flow rate to the bathtub in two stages, the change in large flow rate is eliminated and the occurrence of water hammer action is prevented. Hot water filling can be performed without causing large flow rate changes and temperature fluctuations.

However, when a bathroom is installed on the upper floor of the second or third floor, it is necessary to send hot water from the hot water storage tank to the upper floor. Therefore, compared to the case where a bathroom is provided on the first floor, a hot water storage type hot water heater Even so, the tapping pressure decreases. As a result, even in the case of a high-pressure type hot water storage type hot water heater, the hot water is sent to the upper floor, so that the maximum flow rate falls to a water flow rate (less than 15 L / min) that does not cause a water hammer effect. The hot water filling time is unnecessarily prolonged by performing the hot water filling control (control that fills water by changing the flow rate in two stages) peculiar to the high-pressure type hot water storage type hot water heater even though the impact action does not occur. Resulting in. Therefore, in the hot water storage type water heater of the present invention, the hot water filling time after the second time is shortened based on the hot water flow rate at the time of full opening detected by the flow rate sensor 11 during the hot water filling test operation or the first hot water filling operation.

  Specifically, it is confirmed whether or not the flow rate when the flow rate adjustment valve 10 is fully open is larger or smaller than the predetermined flow rate A during the hot water filling test operation. That is, the flow rate detected by the flow rate sensor 11 when the flow rate adjustment valve 10 is fully opened is a predetermined flow rate A (15 L / min in the present embodiment, but it differs depending on the piping length of the hot water storage water heater, etc. Is not larger than or smaller than The predetermined flow rate A indicates the amount of change that causes a water hammer effect when the amount of change when the flow rate adjustment valve 10 is driven exceeds the predetermined flow rate A.

  Next, the second and subsequent hot water filling will be described. First, the hot water filling operation when the hot water filling flow rate when the flow rate adjusting valve 10 is fully opened during the hot water filling trial operation is less than the predetermined flow rate A (15 L / min) will be described.

  3 and 4 are diagrams for explaining the second and subsequent hot water filling operations. If the filling flow rate when the flow rate adjustment valve 10 is fully opened during the filling test operation is 14 L / min, for example, the filling flow operation is less than the predetermined flow rate A (15 L / min). Done. That is, even if the flow rate is opened from zero to 14 L / min at a stroke, the water hammer effect does not occur, so there is no need for two stages.

  Therefore, as shown in FIG. 3, the filling operation is started by suddenly opening the flow rate adjustment valve 10 without starting the filling operation at the first predetermined opening. As a result, it is not necessary to perform the filling operation by dividing the flow rate into two stages, and the filling time can be shortened. That is, the first predetermined period and the second predetermined period at the start and end of the hot water filling test operation, which have been performed in the hot water filling test operation, are unnecessary, and at least that much can be shortened.

  Next, assuming that the hot water flow rate when the flow rate adjustment valve 10 is fully opened during the hot water filling test operation is, for example, 16 L / min, the hot water flow rate is not less than a predetermined flow rate A (15 L / min). Tension operation is performed. That is, when the flow rate adjustment valve 10 is opened from zero to full open at once, the water hammer effect occurs. However, since it is known that the water hammer effect does not occur even if the flow rate is changed up to the predetermined flow rate A, the hot water filling operation is started after the second opening until the second predetermined opening degree. The second predetermined opening is an opening larger than the first predetermined opening and at which the predetermined flow rate A does not flow even when the second predetermined opening is opened. That is, the filling operation time can be shortened by changing the first predetermined opening to the second predetermined opening.

  The hot water filling operation when the hot water filling maximum flow rate exceeds the predetermined flow rate A will be described with reference to FIG. First, when the hot water filling operation is started, the opening of the flow rate adjustment valve 10 is set to a second predetermined opening (for example, an opening through which 14 L / min flows). As a result, the hot water filling operation is performed at a hot water filling flow rate of 14 L / min at the start of the hot water filling operation, but the water hammer effect does not occur because the flow rate is lower than the flow rate at which the water hammer action occurs.

  In order to stabilize the temperature detected by the temperature sensor 8, the opening of the flow rate adjustment valve 10 is fixed at the second predetermined opening for the first predetermined period. Then, the opening degree of the flow regulating valve 10 is driven over a second predetermined period from the second predetermined opening degree to the fully open position, thereby suppressing the generation of water draining sound of the mixing valve 7.

Then, the filling operation is continued with the opening degree of the flow rate adjusting valve 10 fully opened, and when the filling operation of the set amount of hot water is completed, the opening degree of the flow rate adjusting valve 10 is again opened from the fully opened state over the second predetermined period. Drive to the second predetermined opening. Thereafter, the second predetermined opening is fixed for the first predetermined period, and after the first predetermined period has elapsed, the pouring valve 9 is closed to end the filling operation.

  As described above, the hot water filling operation after the second time is set to the second predetermined opening and then fully opened, so that the hot water filling time can be shortened compared with the hot water filling trial operation. Note that each numerical value used in the present embodiment is determined by an experiment or the like and is not uniquely determined, and thus is not limited to each numerical value shown in the present embodiment.

  As described above, the hot water storage type hot water heater of the present invention is an integrated heat pump type hot water heater, a separate type heat pump type hot water heater configured separately, and a direct hot water type heat pump that can discharge hot water heated by a heat exchanger for hot water supply as it is. The present invention can also be applied to various heat pump water heaters such as water heaters, electric water heaters using an electric heater as a heat source, and hot water storage water heaters combining oil and gas as a heat source.

DESCRIPTION OF SYMBOLS 1 Heating means 2 1st water supply pipe 3 Outlet pipe 4 Hot water supply terminal 5 Bathtub 6 2nd water supply pipe 7 Mixing valve 8 Temperature sensor 9 Pouring valve 10 Flow rate adjusting valve 11 Flow rate sensor 100 Hot water storage tank

Claims (3)

A hot water storage hot water storage tank comprising a hot water storage tank for storing hot water and heating means for heating the hot water in the hot water storage tank, and configured to be able to fill the bathtub with hot water,
A pouring valve for starting and ending filling of the hot water to the bathtub;
A flow rate adjustment valve for adjusting the hot water flow rate to the bathtub,
The first initial opening degree of the flow rate adjustment valve in the hot water filling test operation or the first hot water filling operation is the second initial opening of the flow rate adjustment valve in the hot water filling operation performed after the hot water filling test operation or the first hot water filling operation. Hot water storage water heater characterized by being smaller than the degree. When the hot water flow rate when the flow rate adjustment valve is fully opened in the hot water filling test operation or the initial hot water filling operation is equal to or higher than a predetermined flow rate at which water hammer is generated,
The hot water storage type hot water heater according to claim 1, wherein the second initial opening is set to an opening at which the filling flow rate is smaller than the predetermined flow rate. When the hot water flow rate when the flow rate adjustment valve is fully opened in the hot water filling test operation or the initial hot water filling operation is less than a predetermined flow rate at which water hammer occurs,
The hot water storage type hot water heater according to claim 1, wherein the second initial opening is fully opened.

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