JP2019095168A - Storage hot water supply device - Google Patents

Abstract

To provide a storage hot water supply device capable of suppressing noise and vibration generating in an air bleeding operation by adjusting an opening of a flow rate regulation valve to a throttle side in association with a water supply pressure.SOLUTION: A storage hot water supply device (1) including a hot water storage tank (2), a water supply pipe (5), a hot water supply pipe (4, 8), a hot water filling pipe (9) connected to a bathtub, a hot water filling valve (9b), a supply hot water flow rate regulation valve (8b) and the like, includes a pressure sensor (5e) capable of detecting an internal pressure of the hot water storage tank (2) or the pipes, the hot water filling valve (9b) is opened to discharge the air to the bathtub for bleeding in executing an air bleeding operation to the hot water storage tank (2) and the pipes. When a pressure detected by the pressure sensor (5e) before start of the air bleeding operation is a prescribed pressure or more, an opening of the supply hot water flow rate regulation valve (8b) is regulated to an opening set to a throttle side according to the detected pressure, and then the hot water filling valve (9b) is opened to start the air bleeding operation.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hot water storage hot water supply apparatus, and more particularly to a hot water storage hot water supply apparatus configured to suppress abnormal noise and vibration generated during an air releasing operation (water filling operation).

The hot water storage system includes a hot water storage tank, a water supply system for supplying water to the hot water storage tank, a hot water supply system for supplying hot water of the hot water storage tank, a pouring system for pouring water into a bath, hot water and water between external heat source equipment such as a heat pump unit and the hot water storage tank. It has a circulating system for storing hot water, an auxiliary heat source machine connected to a water supply system and a hot water storage tank, a heating system and a circulating system for circulating hot and cold water from a hot water supply system and an auxiliary heat source machine. .

At the final stage of construction where the hot water storage and hot water supply device described above is constructed, it is necessary to remove air from the hot water storage tank and the piping system.
When this air is released, normally, the flow control valve of the hot water supply system is fully opened and water is supplied from the water supply system to the hot water storage tank or piping system to fill the water, and the air in the hot water storage tank or piping system is poured from the pouring system to the bathtub Remove air by blowing out.

In the cogeneration system described in Patent Document 1, the adjustment value of the hot water proportional valve is gradually adjusted so that none of the detection values of one or a plurality of flow rate sensors exceeds a predetermined value during the air releasing operation. By increasing the opening degree, the flow rate of hot and cold water passing through the flow rate sensor immediately after the start of the air bleeding operation is limited to suppress the failure of the flow rate sensor and the generation of the vibration noise.

Patent No. 4129193 gazette

As in the prior art, when the air is released, the flow control valve of the hot water supply system is fully opened, and the air is discharged from the water supply system to the hot water storage tank and the piping system while blowing water into the bath.
However, although the water supply pressure of the water supply source (water supply system) is usually about 200 kPa, the water supply pressure may be 300 kPa or more depending on the area where the hot water storage apparatus is installed. It may be more than that.

When the water supply pressure is high, the air in the hot water storage tank or the piping system is compressed by the water supply immediately after the start of the water supply and becomes high pressure, and the pouring system jets out to the bathtub. At this time, the water flow control valve installed on the upstream side of the hot water supply system and the pouring area at the branch or rotating section rapidly rotates and breaks or the piping system abnormally vibrates to generate abnormal noise. There is a problem of

In the technique of Patent Document 1, as a countermeasure against the above problem, the opening degree is gradually increased while adjusting the opening degree of the hot water proportional valve so that none of the detection values of one or a plurality of flow rate sensors exceeds a predetermined value. Control is adopted.
However, in this technique, the opening degree is gradually increased while adjusting the opening degree of the hot-water proportional valve as described above even when the water supply pressure is low or high. Therefore, there is no risk of damage to the flow control valve at a normal water supply pressure of about 200 kPa or less, and there is no risk of abnormal noise generation, the time required for air removal becomes longer because of the above control. There is a problem of

  It is an object of the present invention to provide a hot water storage apparatus capable of suppressing abnormal noise and vibration generated at the time of air releasing operation by adjusting the valve opening degree of the flow rate adjustment valve to the throttle side in association with water supply pressure. is there.

The hot water storage apparatus according to claim 1 comprises a hot water storage tank, a water supply pipe connected to a lower portion of the hot water storage tank, a hot water supply pipe connected to an upper portion of the hot water storage tank, and a pouring pipe branched from the hot water supply pipe and connected to a bathtub. And a hot water supply apparatus provided with a hot water supply valve provided in the hot water supply pipe, and a flow control valve provided upstream of a hot water supply pipe and a branch portion of the hot water supply pipe and the hot water supply pipe, A pressure detection unit capable of detecting the internal pressure of the tank or the piping is provided, and when the air removal operation is performed on the hot water storage tank and the piping, the pouring valve is opened to discharge the air to the bathtub. In the hot water storage apparatus configured to perform air removal, when the pressure detected by the pressure detection unit before the start of the air removal operation is equal to or higher than a predetermined pressure, the valve opening degree of the flow rate adjustment valve is detected Set on the throttle side according to the pressure Adjusted to the opening degree which is is characterized by starting the air bleeding operation is opened then note the hot water valve.

  According to the above configuration, when the internal pressure (water supply pressure) of the hot water storage tank or the piping detected by the pressure detection unit is equal to or higher than a predetermined pressure, the valve opening degree of the flow rate adjustment valve is detected pressure In order to adjust the opening set on the throttle side according to the opening side and then start the air venting operation by opening the pouring valve, a valve according to the water supply pressure so as to narrow the valve opening degree as the water supply pressure becomes higher Since the opening degree is set and the air is released, it is possible to prevent the damage of the flow control valve and the generation of abnormal noise, and it is also possible to shorten the time required for the air removal.

The hot water storage apparatus according to claim 2 is characterized in that, in the invention according to claim 1, the valve opening degree of the flow rate adjustment valve is set to the maximum opening degree after a predetermined time from the start of the air removing operation.
According to this configuration, in view of the fact that the air pressure in the hot water storage tank and the piping decreases and the flow velocity of the air flow also decreases if a predetermined time elapses from the start of the air removal operation, the flow rate adjustment is performed after the predetermined time. The valve opening degree of the valve is the maximum opening degree. Thereby, the required time of air removal can be shortened as much as possible.

A hot water storage apparatus according to claim 3 has a hot water heating function, and the heating system includes an expansion tank open to the atmosphere, and the water supply pipe is branched and connected to the expansion tank. A heat medium supply pipe and a supply valve for opening and closing the heat medium supply pipe, and when the pressure detected by the pressure detection means is equal to or higher than a set pressure, the supply valve is operated before the start of the air removal operation. The hot water storage apparatus according to claim 1, characterized in that it is opened.

  According to this configuration, by opening the supply valve, part of the water supplied from the water supply source is drained to the expansion tank via the heat medium supply piping and drained, thereby supplying the water supply piping at the start of air removal. Since the flow rate of the clean water can be reduced and the compression speed for compressing the air inside the hot water storage tank and the piping can be reduced, it is possible to reliably prevent the occurrence of breakage or abnormal noise of the flow control valve.

  According to the present invention, various effects as described above can be obtained.

It is a block diagram of the hot water storage hot water supply apparatus which concerns on embodiment of this invention. It is a flowchart of air release operation control.

Hereinafter, embodiments of the present invention will be described based on the drawings.
First, the entire configuration of the hot water storage hot water supply device 1 will be described.
As shown in FIG. 1, the hot water storage hot water supply device 1 includes equipment such as a hot water storage tank 2, an auxiliary heat source machine 3, piping, a pump and a valve. The hot water storage apparatus 1 stores, for example, hot water in the hot water storage tank 2 heated by an external heat source machine 30 such as a heat pump type heat source machine or a fuel cell, and uses the hot water for hot water supply. In addition, the hot water storage apparatus 1 uses the hot water heated by the auxiliary heat source machine 3 for hot water supply, heating, and bath reheating. The auxiliary heat source unit 3 heats the hot and cold water using, for example, the combustion heat of the fuel gas.

  At the upper part of the hot water storage tank 2, a hot water discharge passage 4 for tapping hot water stored in the hot water storage tank 2 is connected. At the lower part of the hot water storage tank 2, a water supply passage 5 for supplying clean water to the hot water storage tank 2 is connected. A bypass passage 6 branched from the water supply passage 5 is connected to the hot water discharge passage 4, and a hot water / water mixing valve 7 capable of adjusting a mixing ratio for mixing hot water of the hot water passage 4 and upper water of the bypass passage 6 is attached to this connection portion. ing. A hot water supply passage 8 is connected to the hot and cold water mixing valve 7, and the hot and cold water mixed by the hot and cold water mixing valve 7 passes through the hot water supply passage 8 and is supplied to a hot water tap or the like. The hot water discharge passage 4 and the hot water supply passage 8 correspond to "hot water supply piping".

  A hot water supply flow sensor 8a, a hot water supply temperature sensor 8c, and a hot water supply flow control valve 8b are attached to the hot water supply passage 8, and a pouring passage for pouring water into the bath from the hot water supply passage 8 downstream of the hot water flow control valve 8b. 9 (corresponding to a pouring piping) is branched, and a pouring flow rate sensor 9a and a pouring solenoid valve 9b are attached to the pouring passage 9. The pouring passage 9 is connected to the bath return passage 10, and the bath return passage 10 is connected to the bath heat exchanger 20, and the bath heat passage 20 extends from the bath heat exchanger 20 to the bath. A circulation pump 10 a and a bath water flow switch 10 b are attached to the bath return passage 10.

  Heat medium passages 21 and 22 for circulating the heating heat medium through the heating terminal (not shown) and the heating heat exchanger 19, the atmosphere-opened expansion tank 23 for storing the heating heat medium, and the expansion tank 23 A heat medium passage 23c connecting the heat medium passage 22; a pump 23b interposed in the heat medium passage 23c; a drainage passage 23d for leading the heat medium overflowing from the expansion tank 23 to the drainage weir 23e; Heating supply water electromagnetic valve 25a attached to the top of the water supply pipe 25 (corresponding to a heat medium supply piping) connecting the heating supply water electromagnetic valve 25a to the supply water valve 25b at the upstream end of the water supply passage 5 Is provided. The heating replenishing water solenoid valve 25a corresponds to a "replenishing valve". The makeup water valve 25b is kept open after the hot water storage apparatus 1 is installed.

  On the outer periphery of the hot water storage tank 2, a plurality of hot water storage temperature sensors 2a to 2e for detecting the temperature of the stored hot water are mounted at predetermined intervals in the vertical direction. A mixing valve inlet temperature sensor 4 a for detecting the temperature of the hot and cold water supplied to the hot and cold water mixing valve 7 is attached to the tapping passage 4.

Next, the auxiliary outlet passage 16 will be described.
The auxiliary outlet passage 16 has a passage 16a, a passage 16b and a passage 16c. The passage 16a extends from the upstream portion of the outlet passage 4, the passage 16b is connected to the passage 16a, and the heat exchange returns between the passage 16a and the passage 16b. A three-way valve 17 is attached to the connection of the passage 13.
The downstream end of the passage 16 b is connected to the auxiliary heat source unit 3, and the upstream end of the passage 16 c is also connected to the auxiliary heat source unit 3. The circulation pump 18 and the circulation flow rate sensor 14 are attached to the passage 16 b. A control valve 15 is attached to a connection portion between the passage 16 c and the hot water discharge passage 4.
Thus, the hot and cold water of the hot water storage tank 2 can be heated by the auxiliary heat source unit 3 and supplied to the hot water discharge passage 4. The adjusting valve 15 adjusts the flow rate of hot and cold water supplied to the hot water outlet passage 4 through the passage 16 c.

  The heat exchange passage 12 branched from the auxiliary heating passage 16 is connected so as to be able to supply the hot water heated by the auxiliary heat source machine 3 to the heating heat exchanger 19 and the bath heat exchanger 20 via the passages 12a and 12b. The upstream end of the heat exchange return passage 13 for returning the water heated and exchanged by the exchanger 19 and the bath heat exchanger 20 to the auxiliary heat source unit 3 is connected to the solenoid on-off valves 12c and 12d at the downstream portion of the passages 12a and 12b, The downstream end of the heat exchange passage 13 is connected to the three-way valve 17. The three-way valve 17 is switched so that the hot water of the hot water storage tank 2 or the hot water of the heat exchange passage 13 can be supplied to the auxiliary heat source unit 3.

  The water supply passage 5 is provided with a pressure reducing valve 5a, a check valve 5b, a switching valve 5c, a water supply temperature sensor 5d, and a pressure sensor 5e (pressure detection means) for detecting a water supply pressure. The water supply passage 5 is connected to the heat exchange return passage 13 via the switching valve 5c. The switching valve 5 c switches the water supply destination to the hot water storage tank 2 or the heat exchange return passage 13.

  A check valve 6 a is attached to the bypass passage 6, and a high temperature outlet hot water avoidance solenoid valve 6 c is attached to the high temperature outlet hot water bypass passage 6 b branched from the bypass passage 6 and connected to the hot water supply passage 8. The high temperature hot water avoidance solenoid valve 6c normally maintains a closed state by energization. When the hot water supply temperature sensor 8c detects that the hot water supply temperature is equal to or higher than the limit temperature described later, the high temperature hot water outlet solenoid valve 6c is opened to supply the hot water to the hot water supply passage 8, and hot water is being supplied. If the water is supplied to prevent high temperature hot water supply.

An upstream heating passage 26 for supplying hot and cold water to the external heat source unit 30 is connected to the lower portion of the hot water storage tank 2, and a downstream heating passage 27 through which the hot and cold water heated by the external heat source unit 30 flows is connected to the upper portion of the hot water storage tank 2. Hot water heated from the top of the hot water storage tank 2 is stored.
A midway portion of the upstream heating passage 26 and a midway portion of the downstream heating passage 27 are connected by a bypass passage 26a, and a switching control valve 27a is mounted at a connection portion of the downstream heating passage 27 and the bypass passage 26a.

  The hot water storage apparatus 1 includes a control unit 28 that controls a hot water supply operation and the like based on a detection signal of the mixing valve inlet temperature sensor 4 a or the like, and the operation remote controller 29 for the user to set the hot water supply set temperature is a control unit. Connected to 28. The control unit 28 compares the temperature detected by the uppermost hot water storage temperature sensor 2a with the temperature detected by the mixing valve inlet temperature sensor 4a, and uses the higher temperature as the outlet water temperature for control.

  When hot water supply is started by opening a hot water supply plug or the like and the hot water supply flow rate sensor 8a detects a predetermined flow rate, the control unit 28 causes the hot water supply temperature to reach the hot water supply set temperature based on the hot water discharge temperature and the water supply temperature. Adjust the mixing ratio of Then, based on the hot water supply temperature detected by the hot water supply temperature sensor 8 c, the control unit 28 further adjusts the mixing ratio of the hot and cold water mixing valve 7.

  By the way, according to the present invention, the pressure sensor 5e (pressure detection means before the start of the air venting operation for removing the internal air while putting water in the hot water storage tank 2 and piping in the final stage of the construction of installing the hot water storage water heater 1 If the pressure detected by step b) is equal to or higher than a predetermined pressure (for example, 200 kPa), the valve opening degree of the hot water supply flow rate adjusting valve 8b is adjusted to the opening degree set on the throttling side according to the detected pressure; Thereafter, it is characterized in that the pouring valve 9b is opened to start the air releasing operation.

The control program of the above-described air removal operation is stored in advance in the control unit 28, and this air removal operation control will be described based on the flowchart of FIG.
Note that in FIG. 2, the symbol Si (where i = 1, 2,...) Indicates each step.

When control of the air removal operation is started, the following air removal preparation process is performed in S1. The feed water main valve at the most upstream part of the water supply system is manually opened, the pouring solenoid valve 9b is closed, the solenoid on-off valves 12c and 12d are opened, and the switching valve 5c is fed to the hot water storage tank 2 , The three-way valve 17 is switched to a position connecting the heat exchange return passage 13 to the passage 16a, the switch control valve 27a is switched to a position closing the bypass passage 26a, and the regulating valve 15 is kept fully open Be done. In this state, the fresh water supplied from the water supply passage 5 flows into the hot water storage tank 2 and a part of the piping.

  Next, in S2, the feed water pressure Pw is detected by the pressure sensor 5e. Next, in S3, it is determined whether or not the water supply pressure Pw is equal to or higher than the set pressure (for example, 400 kPa). When the determination is Yes, the heating replenishment water solenoid valve 25a is fully opened in S4, and the expansion tank 23 is opened. Fresh water is supplied as a heating heat medium, and the opening degree of the hot water supply flow control valve 8b is set to 20%. As described above, when the water supply pressure is high, part of the water supply is taken into the expansion tank 23 and discharged from the expansion tank 23 through the drainage passage 23d to the drainage weir 23e. It is possible to reduce the compression rate at which the internal air is compressed by the clean water. In addition, the flow velocity of the compressed air inside the hot water supply passage 8 and the pouring passage 9 can be restricted low by narrowing the opening degree of the hot water supply flow rate adjustment valve 8 b largely.

  If the determination in S3 is No, it is determined in S5 whether or not the water supply pressure Pw is 300 kPa or more. If the determination is Yes, the opening degree of the hot water supply flow rate adjustment valve 8b is set to 40% in S6. Thus, the opening degree of the hot water supply flow control valve 8b can be increased by the amount by which the water supply pressure Pw is lowered. If the determination in S5 is No, it is determined in S7 whether the water supply pressure Pw is 200 kPa or more, and if the determination is Yes, the opening degree of the hot water supply flow rate adjustment valve 8b is set to 60% in S8. Thus, the opening degree of the hot water supply flow control valve 8b can be increased by the amount by which the water supply pressure Pw is lowered. If the determination in S7 is No, that is, if the water supply pressure Pw is less than 200 kPa and the water supply pressure is normal, the opening degree of the hot water supply flow control valve 8b is set to 100% in S9. Because the water supply pressure Pw is sufficiently low, it is not necessary to reduce the opening degree of the hot water supply flow control valve 8b.

After shifting from S4, S6, S8, and S9 to S10 and opening the pouring solenoid valve 9b in S10, the air releasing operation is started. Immediately after the start of the air removal operation, air compressed by the fresh water flowing from the hot water storage tank 2 and piping into the hot water discharge passage 4 and the hot water supply passage 8 spouts from the pouring passage 9 to the bath, and then compressed air. Subsequently, clean water is released to the bath.
In S3 to S8, the opening degree of the hot water supply flow control valve 8b is adjusted to the throttle side according to the water supply pressure Pw, so the flow velocity of compressed air in the hot water discharge passage 4, the hot water supply passage 8 and the pouring passage 9 becomes excessive. Since the hot water supply flow rate sensor 8a and the hot water supply flow rate sensor 9a are not damaged, no abnormal noise is generated due to the vibration of the pipe.

  Since most of the compressed air is discharged in about 30 seconds, it is determined in S11 whether or not a predetermined time (for example, 60 seconds) has elapsed after the start of the air removal operation, and if the determination is No S11 is repeated, and when the determination of S11 becomes Yes, the opening degree of the hot water supply flow rate adjustment valve 8b is set to 100% in S12. This is because it is not necessary to reduce the opening degree of the hot water supply flow rate adjustment valve 8b because the high pressure compressed air disappears in the pipe.

In S13, the air releasing operation is continued. At this time, the switching of the valve is performed in stages, and the air in the piping is sequentially evacuated. For example, by switching the switching valve 5c to a position where the water supply passage 5 is connected to the heat exchange passage 13, the air in the heat exchange passage 13 and the passage 16a is evacuated and then the three-way valve 17 is connected to the passage 13 and the passage 16b. The air in the passages 16b and 16c and the air in the passages 12, 12a and 12b are evacuated by switching the position to the above position and operating the pump 18. Further, air in the upstream heating passage 26 and the downstream heating passage 27 is removed by operating the pump in the external heat source unit 30, and then the switching control valve 27a is switched to connect the bypass passage 26a and the passage 27. Air in the bypass passage 26a is evacuated.
With regard to the passages 10 and 11, by operating the pump 10a, air can be released by flowing the upper water of the pouring passage 9 into the passages 10 and 11.

  As for the heating heat medium, when the pump 23b is operated while supplying fresh water to the expansion tank 23 by fully opening the heating makeup water solenoid valve 25a when S4 is not passed, the fresh water is in the passage 23c, Since the air is supplied to the passages 21 and 22, the air in the passages 23c and 21 and 22 can be removed.

As mentioned above, the inside of the hot water storage tank 2 and the piping is vented, and when the water filling is completed,
Air bubbles are not mixed in the water injection to the bath, and the water injection state becomes stable. In S14 following S13,
It is determined whether or not the water filling state to the bathtub has stabilized, and if the determination is No, the process returns to S13, and if the determination of S14 is Yes, the process proceeds to S15 and the air removal operation is ended.

Next, the operation and effects of the hot water storage device 1 described above will be described.
When the internal pressure (water supply pressure) of the hot water storage tank 2 or piping detected by the pressure sensor 5e is equal to or higher than a predetermined pressure (for example, 200 kPa), the valve opening degree of the hot water flow control valve 8 is determined according to the detected pressure. (20%, 40%, 60%) and then the pouring valve 9b is opened to start the air venting operation, so the higher the water supply pressure, the more the valve opening Since the valve opening degree is set according to the water supply pressure so as to squeeze and air is released, damage to the hot water supply flow control valve 8b and generation of abnormal noise can be prevented, and the hot water supply flow control valve 8 Since the valve opening degree is narrowed, the time required for air removal can be shortened.

  If a predetermined time (for example, 60 seconds) elapses from the start of the air venting operation, the air pressure in the hot water storage tank 2 and the piping decreases and the flow rate of the air flow also decreases. The valve opening degree of the flow rate adjusting valve 8b is the maximum opening degree. Thereby, the required time of air removal can be shortened as much as possible.

  When the water supply pressure is equal to or higher than the set pressure, part of the water supply from the water supply source is drained to the expansion tank 23 via the heat medium supply piping 25 and drained by opening the heating supply water electromagnetic valve 25a. It is possible to reduce the flow rate of the clean water supplied to the water supply pipe at the start of air removal and to reduce the compression speed for compressing the air inside the hot water storage tank 2 and the pipes. Sound generation can be reliably prevented.

Next, an example of partially changing the embodiment will be described.
(1) The numerical values of 20%, 40%, and 60% shown in FIG. 2 are merely examples, and the present invention is not limited to these numerical values.
(2) The hot water supply flow control valve 8 b may be provided at a branch portion of the hot water supply passage 8 and the hot water supply passage 9.
(3) In addition, those skilled in the art can carry out various modifications to the above embodiment, and the present invention also includes such modifications.

1 hot water storage hot water supply device 2 hot water storage tank 5 water supply passage (hot water supply piping)
5e Pressure sensor 4 Hot water passage (hot water supply piping)
8 Hot water supply passage (hot water supply piping)
8b Hot water supply flow control valve 9 pouring passage (pouring piping)
9 b Pouring solenoid valve 23 expansion tank 25 supply water passage (heat medium supply piping)
25a Heating supply water solenoid valve (supply valve)

Claims (3)

A hot water storage tank, a water supply pipe connected to the lower part of the hot water storage tank, a hot water supply pipe connected to the upper part of the hot water storage tank, a pouring pipe branched from the hot water supply pipe and connected to the bathtub, and provided in the pouring pipe A hot water storage apparatus comprising a pouring valve, and a flow control valve provided upstream of a hot water supply pipe and a branch portion of the hot water supply pipe or branch portion, and detecting the internal pressure of the hot water storage tank or the piping Means for detecting the temperature of the hot water storage tank and the piping, the hot water supply valve is opened and the air is discharged to the bath to release the air. In the device
When the pressure detected by the pressure detection means before the start of the air removal operation is equal to or higher than a predetermined pressure, the valve opening degree of the flow rate adjustment valve is set to the throttle side set in accordance with the detected pressure. The hot water supply apparatus characterized by adjusting to and then opening a pouring valve and starting air release operation.   The hot water storage apparatus according to claim 1, wherein a valve opening degree of the flow rate adjustment valve is set to a maximum opening degree after a predetermined time from the start of the air removing operation.   It has a hot water heating function, a heating system is provided with an expansion tank opened to the atmosphere, and a heat medium supply pipe branched from the water supply pipe and connected to the expansion tank, and a supply that opens and closes the heat medium supply pipe. The hot water storage apparatus according to claim 1, further comprising a valve, wherein the supply valve is opened before the start of the air removal operation when the pressure detected by the pressure detection means is equal to or higher than a set pressure.

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