JP2022082017A - Hot water storage unit - Google Patents

Abstract

To provide a hot water storage unit which enables reduction of hot water drained and wasted during maintenance and reduction of time of the maintenance.SOLUTION: A hot water storage unit (10) includes: a hot water storage tank (11) housed within an exterior case (10a); pipes of a water supply system and a tapping system connected to the hot water storage tank (11); auxiliary tools respectively disposed on these pipes; and control means (25) which controls the auxiliary tools. The hot water storage unit (10) further includes drainage water flow quantity detection means (18a) which detects a flow quantity of drainage water. When hot water stored in the hot water storage tank (11) is drained during maintenance in which inspection and replacement of the pipes or the auxiliary tools are conducted, the control means (25) determines a necessary drainage water quantity according to the pipes or the auxiliary tools to be subjected to the maintenance. Further, when an integrated drainage water quantity, obtained by integrating flow quantities detected by the drainage water flow quantity detection means (18a) from start of draining, becomes the necessary drainage water quantity, the situation is reported to an operator.SELECTED DRAWING: Figure 3

Description

The present invention relates to a hot water storage unit of a hot water storage device, and particularly to drainage of the hot water storage unit.

Conventionally, a hot water storage device that has a main heat source machine and a hot water storage unit, stores hot water heated by the main heat source machine in a hot water storage tank provided in the hot water storage unit, and uses the stored hot water for hot water supply has been widely used. ing. Since tap water is supplied from the water supply passage as much as the hot water in the hot water storage tank is supplied, a large amount of hot water is constantly stored in the hot water storage unit.

In addition to the hot water storage tank, the hot water storage unit has multiple supplements such as a pump for supplying hot water from the hot water storage tank to the main heat source machine, and a mixing valve for mixing clean water with the hot water stored and adjusting the temperature. A plurality of pipes for connecting the equipment and a plurality of auxiliary equipment to form a hot water passage are arranged. For example, malfunctions and leaks in the seal portion may occur in these accessories and pipes, and maintenance is performed by removing the accessories and pipes for repair and replacement.

When the auxiliary equipment and piping are removed, the hot water inside the hot water storage tank and the piping will flow out. Therefore, as in Patent Document 1, for example, all the hot water inside the hot water storage device is drained in advance during maintenance. ing.

Japanese Unexamined Patent Publication No. 2019-132474

However, if all the hot water inside the hot water storage device is drained as in Patent Document 1, a large amount of hot water that is not used for hot water supply is wasted, and it takes time to complete the drainage. In addition, it takes time to fill the piping and the hot water tank with clean water after inspection and replacement, and it is difficult to complete the maintenance in a short time.

An object of the present invention is to provide a hot water storage unit capable of reducing the amount of hot water that is drained and wasted during maintenance and shortening the maintenance time.

The hot water storage unit according to claim 1 is provided in an outer case, a hot water storage tank housed inside the outer case, a plurality of water supply system and hot water discharge system pipes connected to the hot water storage tank, and a plurality of the pipes. In a hot water storage unit provided with a plurality of auxiliary devices individually interposed and a control means for controlling the plurality of the auxiliary devices, the drainage flow rate detecting means for detecting the drainage flow rate is further provided, and the plurality of the pipes or a plurality of the above-mentioned pipes or a plurality of. When draining the hot water stored in the hot water storage tank at the time of maintenance for checking and replacing the auxiliary equipment, the control means determines the required drainage amount according to the piping or the auxiliary equipment to be maintained. At the same time, it is characterized in that when the integrated drainage amount obtained by integrating the detected flow rate by the drainage flow rate detecting means from the start of drainage reaches the required drainage amount, the operator is notified to that effect.

According to the above configuration, the control means of the hot water storage unit notifies the operator that the required drainage amount determined according to the maintenance target has been drained. Since the required amount of drainage has been drained, the operator can stop the drainage and perform inspection and replacement of the maintenance target without the outflow of hot water. Therefore, maintenance can be performed without draining all the hot water inside the hot water storage unit, so that the amount of hot water that is drained and wasted without being used can be reduced, and the time required for draining can be shortened. In addition, after inspection and replacement, clean water is supplied as much as the drained water, so this time can be shortened and maintenance can be completed in a short time.

The hot water storage unit according to claim 2 is provided in an outer case, a hot water storage tank housed inside the outer case, a plurality of water supply system and hot water discharge system pipes connected to the hot water storage tank, and a plurality of the pipes. In a hot water storage unit provided with a plurality of auxiliary devices individually interposed and a control means for controlling the plurality of the auxiliary devices, the water level detecting means for detecting the water level of the hot water storage tank is further provided, and the plurality of the pipes or the pipes or When draining the hot water stored in the hot water storage tank at the time of maintenance for inspecting and replacing a plurality of the auxiliary devices, the hot water storage tank depends on the piping or the auxiliary devices to which the control means is to be maintained. It is characterized in that the residual water level is determined and the operator is notified when the detected water level by the water level detecting means reaches the residual water level.

According to the above configuration, the control means of the hot water storage unit notifies the operator that the water has been drained to the residual water level of the hot water storage tank determined according to the maintenance target. Since the drainage has reached the residual water level, the worker can stop the drainage and perform inspection and replacement of the maintenance target without the outflow of hot water. Therefore, maintenance can be performed without draining all the hot water inside the hot water storage unit, so that the amount of hot water that is drained and wasted without being used can be reduced, and the time required for draining can be shortened. In addition, after inspection and replacement, clean water is supplied as much as the drained water, so this time can be shortened and maintenance can be completed in a short time.

The hot water storage unit according to the third aspect of the present invention is provided with the input means for the operator to input the pipe or the auxiliary equipment to be maintained to the control means in the invention of the first or second aspect. It is a feature.
According to the above configuration, the operator can easily input the maintenance target by the input means, and the control means can notify the operator that the drainage according to the input maintenance target is completed.

In the invention of claim 1, the hot water storage unit according to claim 4 is such that the plurality of pipes and the plurality of auxiliary devices belong to any one of the plurality of blocks in which the required drainage amount is set in advance. Each of them is classified and is characterized in that the operator is provided with an input means for inputting the pipe to which the maintenance target or the block to which the auxiliary equipment belongs to the control means.
According to the above configuration, the operator can easily input the block to which the maintenance target for which the required drainage amount is set belongs by the input means. Therefore, the control means can notify the operator that the required amount of drainage according to the input block has been drained.

In the invention of claim 2, the hot water storage unit according to claim 5 has the plurality of pipes and the plurality of auxiliary devices in any one of a plurality of blocks in which the residual water level of the hot water storage tank is set in advance. Each of them is classified so as to belong to the control means, and the operator is provided with an input means for inputting the pipe to which the maintenance target or the block to which the auxiliary equipment belongs to the control means.
According to the above configuration, the operator can easily input the block to which the maintenance target for which the residual water level of the hot water tank is set belongs by the input means. Therefore, the control means can notify the operator that the drainage is completed up to the residual water level of the hot water storage tank according to the input block.

According to the hot water storage unit of the present invention, it is possible to reduce the amount of hot water that is drained and wasted during maintenance and to shorten the maintenance time.

It is explanatory drawing of the hot water storage hot water supply apparatus which concerns on embodiment of this invention. It is a side view of the inside of a hot water storage unit. It is a flowchart of drainage control which concerns on Example 1. FIG. It is a flowchart of drainage control which concerns on Example 2. FIG.

Hereinafter, embodiments for carrying out the present invention will be described.
As shown in FIG. 1, the hot water storage hot water supply device 1 has a main heat source machine 2, an auxiliary heat source machine 3, and a hot water storage unit 10. As the main heat source machine 2, for example, a heat pump type heat source machine is used. The auxiliary heat source machine 3 is, for example, a heat source machine that utilizes the heat of combustion of fuel.

The hot water storage device 1 is configured to perform a hot water storage operation for storing hot water heated by the main heat source machine 2 in a hot water storage tank 11 housed in the outer case 10a of the hot water storage unit 10. The hot water stored in the hot water storage tank 11 is supplied to, for example, a hot water tap 6 via the auxiliary heat source machine 3. When the hot water supply tap 6 is opened, the auxiliary heat source machine 3 reheats the hot water supplied from the hot water storage unit 10 through the hot water passage 4, or does not reheat, and supplies hot water through the hot water supply passage 5. It is supplied to the stopper 6 and hot water is supplied as indicated by the arrow HW.

A main heat source machine going pipe 13 provided with a pump 12 is connected to the lower part of the hot water storage tank 11 in order to supply the hot water of the hot water storage tank 11 to the main heat source machine 2. A main heat source machine return pipe 14 for supplying hot water water heated by the main heat source machine 2 to the hot water storage tank 11 is connected to the upper part of the hot water storage tank 11. A switching valve 15 for switching the flow path of hot water is interposed in the middle of the main heat source machine return pipe 14, and the return branch pipe 14a branched from the main heat source machine return pipe 14 in the switching valve 15 is the main heat source machine going pipe. It is connected to a portion upstream of the pump 12 of 13.

A return temperature sensor 14b for detecting the temperature of the hot water heated by the main heat source machine 2 is disposed on the upstream side of the switching valve 15 of the main heat source machine return pipe 14. For example, when the detection temperature of the return temperature sensor 14b immediately after the start of the main heat source machine 2 is low, the switching valve 15 is switched from the hot water storage tank 11 side to the return branch pipe 14a side, and the hot water storage tank 11 is sufficiently heated. Circulate the hot water without returning it. A plurality of hot water storage temperature sensors 11a to 11d are arranged in the hot water storage tank 11, and can detect the temperature and the amount of hot water stored in the hot water storage tank 11.

At the bottom of the hot water storage tank 11, a water supply pipe 16 for supplying clean water indicated by an arrow CW, a drainage pipe 18 provided with a drain plug 17, and a pressure when the pressure of the hot water storage tank 11 rises above a predetermined value due to hot water storage. A pressure release pipe 20 provided with a pressure safety valve 19 for opening the pipe is connected. The drainage pipe 18 is provided with a drainage flow rate sensor 18a as a drainage flow rate detecting means for detecting the drainage flow rate. The main heat source machine going pipe 13, the main heat source machine return pipe 14, and the water supply pipe 16 correspond to the pipes of the water supply system that supplies hot water to the hot water storage tank 11.

A hot water outlet pipe 21 for discharging the hot water of the hot water storage tank 11 to the outside of the hot water storage unit 10 is connected to the top of the hot water storage tank 11. A water supply branch pipe 16a branched from the middle of the water supply pipe 16 is connected to the mixing valve 22 interposed in the middle of the hot water outlet pipe 21. Then, the high temperature hot water outlet avoidance pipe 23 for bypassing the mixing valve 22 and supplying tap water is branched from the water supply branch pipe 16a and connected to the hot water outlet pipe 21. The high-temperature hot water outlet avoiding pipe 23 is normally closed, and is interposed to supply high-temperature hot water discharge avoiding solenoid valve 24 which is opened to prevent high-temperature hot water discharge and supplies clean water to the hot water discharge pipe 21. The hot water outlet pipe 21, the water supply branch pipe 16a, and the high temperature hot water outlet avoidance pipe 23 correspond to the hot water outlet system pipe for discharging hot water from the hot water storage unit 10.

The water supply pipe 16 includes a water supply temperature sensor 16b that detects the temperature (water supply temperature) of the tap water supplied from the water supply pipe 16, a pressure reducing valve 16c that reduces the water supply pressure of the tap water to a predetermined value or less, and a hot water tap 6. A water supply pressure sensor 16d for detecting a decrease in the supply pressure of tap water when the cap is opened is provided. The hot water discharge pipe 21 includes a hot water flow rate sensor 21a that detects the hot water flow rate from the hot water storage unit 10, a hot water storage tank hot water temperature sensor 21b that detects the temperature of hot water discharged from the hot water storage tank 11 (hot water storage tank hot water temperature), and hot water storage. A hot water temperature sensor 21c for detecting the hot water temperature from the unit 10 is arranged.

The hot water storage unit 10 has a control unit 25 as a control means for controlling the hot water storage operation. The control unit 25 drives the pump 12 to circulate hot water between the hot water storage tank 11 and the main heat source machine 2, and stores the hot water heated by the main heat source machine 2 from the upper part of the hot water storage tank 11. Further, the control unit 25 controls the mixing valve 22 so that the temperature detected by the hot water temperature sensor 21c becomes, for example, a preset hot water supply set temperature or a predetermined temperature based on the hot water outlet temperature, the hot water supply temperature, and the hot water flow rate. The hot water is discharged by adjusting the mixing ratio of the hot water stored in the hot water and the clean water. The predetermined temperature is set in advance so that the auxiliary heat source machine 3 can heat the hot water supplied from the hot water storage unit 10 to the hot water supply set temperature to supply hot water. Valve devices such as hot water storage and hot water supply pumps 12, mixing valves 22, and sensors such as hot water flow rate sensors 21a correspond to auxiliary equipment.

An operation terminal 26 for setting the hot water supply set temperature by the user is connected to the control unit 25, for example. The operation terminal 26 is also connected to the auxiliary heat source machine 3 and is configured to be able to supply hot water of the hot water supply set temperature set by the operation terminal 26 to the hot water supply plug 6.

The control unit 25 is an input for changing and inputting a drainage mode switch 25a for setting the drainage mode in the hot water storage unit 10 to a drainage mode, a display unit 25b for displaying numbers, and a display unit 25b for each operation. It includes a switch 25c and an audio output unit 25d. Further, the control unit 25 is provided with a connection port 25e for connecting the maintenance terminal 27 for operating the hot water storage unit 10 to the control unit 25 during maintenance.

The maintenance terminal 27 is, for example, a tablet-type PC, and a maintenance program for the hot water storage device 1 is executed. When the drainage mode is set by operating the drainage mode switch 25a or the maintenance terminal 27, the switching valve 15, the mixing valve 22, etc. are set so that the drainage plug 17 can be drained without staying when it is opened. Auxiliary equipment is driven.

FIG. 2 is a side view of the inside of the outer case 10a of the hot water storage unit 10. A pressure safety valve 19 and a mixing valve 22 are arranged in this order from the upper stage side, and a high temperature hot water avoidance solenoid valve 24 is arranged on the lower side thereof. A pressure reducing valve 16c and a water supply pressure sensor 16d are arranged on the lower side of the high temperature hot water avoidance solenoid valve 24, and a drain plug 17 is arranged on the lowermost side.

Multiple pipes for water supply system and hot water supply system, and multiple accessories are classified so as to belong to any one of four blocks, for example, # 1 to # 4, which are partitioned in the height direction. There is. When a pipe extends over a plurality of blocks, it is classified so as to belong to the lowest block among the plurality of blocks. The required drainage amount and the residual water level corresponding to the lower limit position of the block are set in each of the plurality of blocks.

For example, if a leak in the piping or a malfunction of the auxiliary equipment occurs, the pipe or auxiliary equipment in which the defect has occurred is removed and inspected and replaced. By lowering the water level of the hot water storage tank 11 by draining water below the height position of the pipes and auxiliary equipment to be removed, it is possible to prevent the outflow of the stored hot water even if the pipes and auxiliary equipment are removed. In the following, drainage during maintenance to reduce wasted hot water will be described based on examples.

The operator performing maintenance closes a water tap (not shown) and connects the maintenance terminal 27 to the connection port 25e of the control unit 25 as an input means. Then, after the hot water storage unit 10 is put into the drainage mode by operating the maintenance terminal 27, the operator selects (inputs), for example, the mixing valve 22 as the maintenance target from the maintenance terminal 27, and opens the drain plug 17. And start draining. The drainage control by the control unit 25 at this time will be described with reference to the flowchart of FIG. Si (i = 1, 2, ...) In the figure represents a step.

In S1, the state shifts to the drainage mode and proceeds to S2. Then, in S2, the maintenance target is received and the process proceeds to S3. The maintenance target is selected from a plurality of pipes for the water supply system and the hot water supply system, and a plurality of auxiliary devices such as a mixing valve 22 interposed in the plurality of pipes. Here, it is assumed that, for example, the mixing valve 22 is selected.

In S3, the current storage state of the hot water storage unit 10 is confirmed, and in order to drain the water to the storage amount where the hot water does not flow out even if the received maintenance target is removed, the required drainage amount corresponding to the maintenance target is determined and the process proceeds to S4. Since the supply of clean water is stopped, for example, the current storage state of the hot water storage unit 10 (water level of the hot water storage tank 11) can be confirmed by the head pressure of the hot water storage tank 11 detected by the water supply pressure sensor 16d. The head pressure detected by the water supply pressure sensor 16d is associated with the water level of the hot water storage tank 11 in advance by an experiment. Further, the storage amount of the hot water storage unit 10 is associated with the water level of the hot water storage tank 11 in advance by an experiment.

The height positions of the plurality of pipes and auxiliary equipment with respect to the hot water storage tank 11 are each predetermined, and the water level of the hot water storage tank 11 after drainage required for inspection and replacement to prevent the outflow of hot water is determined by the height positions to be maintained. .. Since the capacity of the hot water storage tank 11 that stores most of the storage amount of the hot water storage unit 10 is determined, the required drainage amount corresponding to the water level of the hot water storage tank 11 after drainage can be determined. For example, as the required drainage amount corresponding to the mixing valve 22, the required drainage amount for draining to the height position h1 of the mixing valve 22 and lowering the water level is determined (see FIG. 2).

The required drainage amount corresponding to the maintenance target can also be the required drainage amount set in the block to which the maintenance target belongs. For example, since the mixing valve 22 belongs to the # 1 block, the required drainage amount for lowering the water level to the lower limit position h2 of the # 1 block is determined (see FIG. 2). The operator may input the number of the block to which the maintenance target belongs from the maintenance terminal 27 and determine the required drainage amount corresponding to the lower limit position of this block.

In S4, the operator opens the drain plug 17 to start drainage, the drainage flow rate sensor 18a detects the drainage flow rate, starts to integrate the drainage amount from the start of drainage, and proceeds to S5. Then, in S5, it is determined whether or not the cumulative drainage amount from the start of drainage is equal to or greater than the required drainage amount determined in S3. If the determination in S5 is No because the required amount of drainage has not been completed, the process returns to S4. If the required amount of drainage is completed and the judgment of S5 is Yes, the process proceeds to S6.

In S6, the operator is notified that the accumulated drainage amount from the start of drainage has reached the required drainage amount, and the process proceeds to S7. For example, the maintenance terminal 27 is displayed and voice output is used to notify that the required drainage amount has been reached, and the operator is urged to close the drain plug 17. The voice output unit 25d of the control unit 25 may notify the operator by voice that the required drainage amount has been reached, and urge the operator to close the drain plug 17.

In S7, it is determined whether or not the drainage stop is detected. For example, if the judgment of S7 is No because the detection of the drainage flow rate is continuing, it returns to S6, and if the judgment of S7 is Yes because the drainage is stopped and the drainage flow rate is not detected, End drainage control.

As described above, when the control unit 25 of the hot water storage unit 10 completes the drainage of the required drainage amount determined according to the maintenance target, the worker notifies the worker to that effect and urges the worker to stop the drainage. Only the amount of drainage required for maintenance can be drained. Therefore, less hot water is drained and wasted, and maintenance work time is shortened. Similarly, when the required amount of drainage is determined according to the block to which the maintenance target belongs, the amount of hot water that is drained and wasted is reduced, and the maintenance work time is shortened.

Even if the maintenance terminal 27 is not connected, for example, a number is assigned to each of a plurality of pipes and a plurality of auxiliary devices, and the operator operates the input switch 25c as an input means to obtain a maintenance target number. Can be entered. Further, the operator may input the number of the block to which the maintenance target belongs by operating the input switch 25c.

An example in which the drainage control of the first embodiment is partially changed will be described.
The operator performing maintenance closes a water tap (not shown) and connects the maintenance terminal 27 to the connection port 25e of the control unit 25 as an input means. Then, after the hot water storage unit 10 is put into the drainage mode by operating the maintenance terminal 27, the operator selects (inputs), for example, the mixing valve 22 as the maintenance target from the maintenance terminal 27, and opens the drain plug 17. And start draining. The drainage control by the control unit 25 at this time will be described with reference to the flowchart of FIG.

S1 and S2 are common to the first embodiment, and in S1, the state shifts to the drainage mode and proceeds to S2. Then, in S2, the maintenance target is received and the process proceeds to S13. Here, it is assumed that, for example, the mixing valve 22 is selected.

In S13, in order to confirm the current storage state of the hot water storage unit 10 and drain the water to the storage amount where the hot water does not flow out even if the received maintenance target is removed, the residual water level of the hot water storage tank 11 after drainage corresponding to the maintenance target is set. Decide and proceed to S14. Since the supply of clean water is stopped, the current storage state (water level of the hot water storage tank 11) can be confirmed by, for example, the head pressure of the hot water storage tank 11 detected by the water supply pressure sensor 16d. The head pressure detected by the water supply pressure sensor 16d is associated with the water level of the hot water storage tank 11 in advance by an experiment, and serves as a water level detecting means for detecting the water level of the hot water storage tank 11 at the time of drainage.

The height positions of the plurality of pipes and auxiliary equipment with respect to the hot water storage tank 11 are each predetermined, and the water level of the hot water storage tank 11 after drainage required for inspection and replacement to prevent the outflow of hot water is determined by the height positions to be maintained. .. Therefore, the residual water level of the hot water storage tank 11 after drainage can be determined. For example, the residual water level corresponding to the height position h1 of the mixing valve 22 is determined (see FIG. 2).

The residual water level corresponding to the maintenance target can also be the residual water level set in the block to which the maintenance target belongs. For example, since the mixing valve 22 belongs to the # 1 block, the residual water level corresponding to the lower limit position h2 of the # 1 block is determined (see FIG. 2). The operator may input the number of the block to which the maintenance target belongs from the maintenance terminal 27 and determine the residual water level corresponding to the lower limit position of this block.

After the operator opens the drain plug 17 and drainage is started, the water level of the hot water storage tank 11 is detected by the water supply pressure sensor 16d in S14, and the process proceeds to S15. Then, in S15, it is determined whether or not the water level of the hot water storage tank 11 is equal to or lower than the residual water level determined in S13. Since the water level of the hot water storage tank 11 is higher than the residual water level, if the determination in S15 is No, the process returns to S14. If the water level in the hot water storage tank 11 is equal to or lower than the residual water level and the determination in S15 is Yes, the process proceeds to S16.

In S16, the operator is notified that the water level of the hot water storage tank 11 has reached the determined residual water level, and the process proceeds to S17. For example, the maintenance terminal 27 displays and voices a notification that the determined residual water level has been reached, and prompts the operator to close the drain plug 17. The voice output unit 25d of the control unit 25 may notify the operator that the determined residual water level has been reached by voice, and urge the operator to close the drain plug 17.

In S17, it is determined whether or not the drainage stop is detected. For example, if the judgment of S17 is No because the detection of the drainage flow rate is continuing, it returns to S6, and if the judgment of S17 is Yes because the drainage is stopped and the drainage flow rate is not detected, End drainage control.

As described above, when the drainage is completed to the level below the residual water level of the hot water storage tank 11 determined according to the maintenance target, the control unit 25 notifies the operator to that effect and urges the operator to stop the drainage. Can drain to the water level required for maintenance. Therefore, less hot water is drained and wasted, and maintenance time is shortened. Similarly, when the residual water level of the hot water storage tank 11 is determined according to the block to which the maintenance target belongs, the amount of hot water that is drained and wasted is reduced, and the maintenance work time is shortened. Further, since it is not necessary to detect the amount of drainage, it is possible to omit the drainage flow rate sensor 18a and reduce the manufacturing cost of the hot water storage unit 10.

Even if the maintenance terminal 27 is not connected, for example, a number is assigned to each of a plurality of pipes and a plurality of auxiliary devices, and the operator operates the input switch 25c as an input means to obtain a maintenance target number. Can be entered. Further, the operator may input the number of the block to which the maintenance target belongs by operating the input switch 25c.

The action and effect of the hot water storage unit 10 will be described.
As in the first embodiment, the control unit 25 of the hot water storage unit 10 notifies the operator that the required drainage amount determined according to the maintenance target has been drained. Since the required amount of drainage has been drained, the operator can stop the drainage and perform inspection and replacement of the maintenance target without the outflow of hot water. Therefore, since maintenance can be performed without draining all the hot water inside the hot water storage unit 10, the amount of hot water that is drained without being used and wasted is reduced, and the time required for draining can be shortened. Further, after the inspection and replacement of the maintenance target, the clean water is supplied by the amount of the drained water, so that this time can be shortened and the maintenance time can be shortened.

As in the second embodiment, the control unit 25 of the hot water storage unit 10 notifies the operator that the water has been drained to the residual water level of the hot water storage tank 11 determined according to the maintenance target. Since the drainage has reached the residual water level, the worker can stop the drainage and perform inspection and replacement of the maintenance target without the outflow of hot water. Therefore, since maintenance can be performed without draining all the hot water inside the hot water storage unit 10, the amount of hot water that is drained without being used and wasted is reduced, and the time required for draining can be shortened. In addition, after inspection and replacement, clean water is supplied as much as the drained water, so this time can be shortened and the maintenance time can be shortened.

The operator can easily input the maintenance target by the maintenance terminal 27 or the input switch 25c which is an input means, and the control unit 25 notifies the operator that the drainage according to the input maintenance target is completed. can do.

When a plurality of pipes and a plurality of auxiliary instruments are classified so as to belong to any one of the plurality of blocks, the maintenance target is set by the maintenance terminal 27 or the input switch 25c in which the operator is an input means. You can easily enter the block to which it belongs. Therefore, the control unit 25 may determine the required drainage amount corresponding to the input block or the residual water level of the hot water storage tank 11 and notify the operator that the drainage of the required drainage amount or the drainage to the residual water level is completed. can.

When the hot water storage device 1 is configured to be operable via the Internet, the maintenance terminal 27 may be connected to the control unit 25 so as to be operable via the Internet. In addition, when draining the required drainage amount, the drainage of the required drainage amount is controlled by the drainage time based on the relationship between the drainage amount and the drainage time (for example, the drainage amount per unit time) determined in advance by the experiment. You can also do it. As the water level detecting means for detecting the water level of the hot water storage tank 11, a plurality of hot water storage temperature sensors 11a to 11d arranged in the hot water storage tank 11 can also be used.

The present invention has a hot water storage unit having a main heat source machine and an auxiliary heat source machine built-in, and hot water is stored in a hot water storage tank or hot water heated by an auxiliary heat source machine, and the temperature is adjusted to supply hot water to a hot water tap. It can also be applied to devices. In addition, a person skilled in the art can carry out the embodiment in a form in which various modifications are added to the above embodiment without departing from the spirit of the present invention, and the present invention includes such modified embodiments.

1: Hot water storage hot water supply device 2: Main heat source machine 3: Auxiliary heat source machine 6: Hot water supply tap 10: Hot water storage unit 10a: Exterior case 11: Hot water storage tank 12: Pump 13: Heat source machine going pipe 14: Heat source machine return pipe 15: Switching valve 16: Water supply pipe 16a: Water supply branch pipe 16d: Water supply pressure sensor (water level detecting means)
17: Drainage plug 18: Drainage pipe 18a: Drainage flow rate sensor (drainage flow rate detecting means)
19: Pressure safety valve 20: Pressure safety pipe 21: Hot water outlet pipe 22: Mixing valve 23: High temperature hot water discharge avoidance pipe 24: High temperature hot water discharge avoidance solenoid valve 25: Control unit (control means)
25a: Drainage mode switch 25b: Display 25c: Input switch (input means)
25d: Audio output unit 25e: Connection port 26: Operation terminal 27: Maintenance terminal (input means)

Claims (5)

An outer case, a hot water storage tank housed inside the outer case, a plurality of pipes for a water supply system and a hot water supply system connected to the hot water storage tank, and a plurality of auxiliary instruments individually interposed in the plurality of pipes. And in a hot water storage unit provided with control means for controlling the plurality of the auxiliary devices.
Further equipped with a drainage flow rate detecting means for detecting the drainage flow rate,
When draining the hot water stored in the hot water storage tank during maintenance to inspect and replace the plurality of pipes or the auxiliary equipment, the control means is applied to the pipe or the auxiliary equipment to be maintained. A hot water storage unit characterized in that the required drainage amount is determined accordingly, and when the cumulative drainage amount obtained by integrating the detected flow rate by the drainage flow rate detecting means from the start of drainage reaches the required drainage amount, the operator is notified to that effect. An outer case, a hot water storage tank housed inside the outer case, a plurality of pipes for a water supply system and a hot water supply system connected to the hot water storage tank, and a plurality of auxiliary instruments individually interposed in the plurality of pipes. And in a hot water storage unit provided with control means for controlling the plurality of the auxiliary devices.
Further equipped with a water level detecting means for detecting the water level of the hot water storage tank,
When draining the hot water stored in the hot water storage tank at the time of maintenance for inspection and replacement of the plurality of pipes or the auxiliary equipment, the control means is applied to the pipe or the auxiliary equipment to be maintained. A hot water storage unit characterized in that the residual water level of the hot water storage tank is determined accordingly, and when the detected water level by the water level detecting means reaches the residual water level, the operator is notified to that effect. The hot water storage unit according to claim 1 or 2, wherein the operator includes an input means for inputting the pipe or the auxiliary equipment to be maintained into the control means. The plurality of pipes and the plurality of auxiliary devices are each classified so as to belong to any one of the plurality of blocks in which the required drainage amount is set in advance, and the operator is the maintenance target of the pipe or the auxiliary device. The hot water storage unit according to claim 1, further comprising an input means for inputting a block to which the device belongs to the control means. The plurality of pipes and the plurality of accessories are each classified so as to belong to any one of the plurality of blocks in which the residual water level of the hot water storage tank is set in advance, and the pipes to which the operator is subject to maintenance. The hot water storage unit according to claim 2, further comprising an input means for inputting the block to which the auxiliary equipment belongs to the control means.

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