KR101436249B1 - Storage type hot water supply device - Google Patents

Abstract

[PROBLEMS] To prevent or reduce the hot water of hot water when an abnormality occurs in a low temperature hot water system.
The hot water supply device includes a low-temperature water tank for storing hot water, a first heat source for heating the hot water of the hot water tank, a hot water supply path for supplying hot water of the hot water tank to the hot water tank, A second heat source for heating the hot water flowing through the hot water supply path; a bypass path for bypassing the second heat source; a first electric drive valve provided in the bypass path; And a control means for controlling the first and second electric drive valves. The control means closes both the first and second electric drive valves when the abnormality of the water supply and mixing valve is detected, and forcibly cuts off the hot water supply.

Description

{STORAGE TYPE HOT WATER SUPPLY DEVICE}

The technique disclosed herein relates to a low temperature hot water supply system.

Patent Literatures 1 and 2 disclose a low-temperature type hot water supply apparatus. The hot water supply device includes a low water temperature stage for storing hot water, a first heat source for heating the hot water of the hot water means, a hot water supply path for sending warm water of the hot water means to the hot water spot, And a second heat source for heating the hot water flowing through the hot water supply path. With this configuration, when the temperature of the hot water from the hot water storage means is excessively high, the temperature of the hot water supply can be lowered by hydration by the water supply mixing valve. On the other hand, when the temperature of the hot water from the heating means is too low, the hot water temperature can be raised by heating by the second heat source.

Patent Document 1: Japanese Patent Application Laid-Open No. 2003-106656 Patent Document 2: Japanese Unexamined Patent Application Publication No. 2003-120997

In the hot water supply apparatus having the above-described configuration, even when heating by the second heat source is not necessary, hot water from the hot water supply means is supplied to the hot water supply location via the second heat source. Therefore, since the heat radiation of the hot water can not be avoided while passing through the second heat source, the thermal efficiency of the hot water supply apparatus is lowered. In order to solve such a problem, it is conceivable to provide a bypass path for bypassing the second heat source. Thus, when heating by the second heat source is not necessary, the unnecessary heat radiation can be prevented or reduced by supplying hot water through the bypass path.

However, if a new bypass path is newly installed, the following problem is assumed. As described above, when the hot water from the heating means is too high, the temperature of the hot water supply is lowered by the water mixing valve. At this time, since hot water does not require heating by the second heat source, hot water is supplied through the bypass path. Here, it is assumed that an abnormality has occurred in the water supply mixing valve. In this case, there is a possibility that the hot water of high temperature is directly heated by the bypass path. The temperature of hot water to be hot-water can be higher than that of the prior art because it does not pass through the second heat source.

Particularly, in the low-temperature type hot water supply apparatus, the hot water in the heating means is temporarily heated to a high temperature (for example, 60 ° C) for the purpose of sterilizing the interior of the heating means. There is a possibility that an abnormality may occur in the water supply and mixing valve even in the case where such heat sterilization is carried out, and effective countermeasures are required.

In view of the above problems, there is provided a technique capable of preventing or reducing the supply of hot water to hot water even when an abnormality occurs in the water supply mixing valve.

The technique disclosed herein is embodied in a low-temperature hot water supply apparatus. The hot water supply device includes a low water temperature stage for storing hot water, a first heat source for heating the hot water of the hot water means, a hot water supply path for sending the hot water of the hot water means to the hot water supply point, And a second heat source for heating the hot water flowing through the hot water supply path.

With this configuration, when the temperature of the hot water from the hot water supply means is too high, the hot water supply device can lower the hot water supply temperature by hydration by the water supply mixing valve. On the other hand, when the temperature of the hot water from the heating means is too low, the hot water temperature can be raised by heating by the second heat source.

The hot water supply system includes a bypass path for bypassing the second heat source, a first electric drive valve provided in the bypass path, a second electric drive valve provided in a section in parallel with the bypass path of the hot water supply path, And a control means for controlling the second electric drive valve. Here, it is preferable that the bypass path is branched at an upstream side of the second heat source of the hot water supply path, bypasses the second heat source, and is merged at a downstream side of the second heat source of the hot water supply path. When the abnormality of the water supply and mixing valve is detected, the control means preferably closes both the first and second electric drive valves and forcibly interrupts the hot water supply.

According to this configuration, even when an abnormality occurs in the water supply and mixing valve, both the hot water supply path and the bypass path are shut off, thereby preventing or reducing erroneous hot water supply of the hot water.

In the hot water supply apparatus described above, it is preferable that the control means closes the second electric drive valve after closing the first electric drive valve. In other words, it is preferable not to close the hot water supply path via the second heat source until the shutoff of the bypass path is completed.

According to this configuration, even if the hot water is mistakenly warmed from the stocking means until the two valves are completely closed, since at least a part of the hot water passes through the second heat source, can do.

In order to take advantage of the bypass path in the above-described hot water supply apparatus, the path length of the hot water from the heating means to the hot water supply place via the second heat source to the hot water supply path from the heating means to the hot water supply point via the bypass path Is short.

Preferably, the control means initiates the closing of the second electric drive valve after a predetermined time has elapsed from the time when the first electric drive valve is started to be closed.

The predetermined time can be appropriately determined in consideration of both the time required for closing the first electric drive valve and the time required for closing the second electric drive valve. However, if the predetermined time is equal to or longer than the time required for bringing the first electric drive valve from the fully opened state to the fully closed state, the timing at which the first electric drive valve is completely closed is set to the second The timing at which the electric drive valve is completely closed can be surely accelerated. Since the closing of the second electric drive valve is not started until the first electric drive valve is completely closed, the hot water preferentially passes through the second heat source, thereby effectively reducing the temperature of hot water supply due to heat radiation .

The first electric drive valve may be a flow control valve capable of controlling the flow rate of the bypass path. In general, the flow control valve is characterized in that the time required for closing is relatively long. Therefore, if the first electric drive valve is a flow control valve, the bypass path can not be immediately closed when an abnormality occurs in the water supply mixing valve. However, by cooperating with the operation of the first and second electric drive valves as described above, it is possible to prevent or reduce hot water from being mistakenly warmed even when the bypass path can not be closed immediately.

1 is a block diagram showing a configuration of a hot water heating apparatus of this embodiment
Fig. 2 is a flow chart
3 is a time chart showing the operation timing of the bypass control valve (first electric drive valve) and the hot water supply valve (second electric drive valve)

In one embodiment of the present invention, a heat pump can be employed as the first heat source for heating the hot water of the heating means. However, the first heat source is not limited to a heat pump, and may be at least one of a fuel cell, a generator, solar light, a gas-type heat source, and an electric heater.

In an embodiment of the present invention, a sealed tank may be employed as the heat storage means. However, the heat storage means is not limited to the closed tank, but may be an open container. In addition, the heat storage means may accumulate not only heat generated by the first heat source but also heat generated by the second heat source or other heat source.

In an embodiment of the present invention, a gas heat source using a combustible gas as a fuel can be employed as the second heat source for heating the hot water flowing through the hot water supply path. However, the second heat source is not limited to a gas-type heat source, and may be an electric heater or other heat source.

In an embodiment of the present invention, the hot water supply device may be a device that performs not only hot water supply but also heating. That is, it may be a hot water heating apparatus.

&Quot; Example &

The hot water heating apparatus 10 of the present embodiment will be described with reference to the drawings. The hot water supply heating device 10 is a heat supply device that performs both hot water supply and heating. 1, the hot water heating apparatus 10 mainly includes a warming tank 30, a heat pump 40, a hot water heating unit 50, a heating terminal 70, a controller 14 and a remote controller 12 Respectively.

The controller 14 is a control means for controlling the operation of the hot water heater 10. The controller 14 of the present embodiment is configured not to be one independent unit but to a plurality of electronic control units distributed in the heat pump 40 and the hot water heating unit 50 and various sensors arranged in the respective pipes have. Various sensors include temperature sensors and flow sensors.

The storage tank 30 is a sealed container for storing hot water. The capacity of the holding tank 30 is, for example, 50 liters. A water supply pipe 28 for supplying tap water to the storage tank 30 is connected to the storage tank 30 and a hot water pipe 16 for supplying the hot water of the storage tank 30 to the hot water storage site. A hot water supply heating unit 50 is provided in the middle of the hot water supply pipe 16 and hot water from the hot water storage tank 30 is sent to the hot water supply place via the hot water supply heating unit 50. A plurality of temperature sensors (36) are arranged along the height direction in the holding tank (30). The plurality of temperature sensors 36 are connected to the controller 14 and the controller 14 can grasp the temperature and the quantity of hot water (that is, the quantity of heat) in the storage tank 30 based on the detection results.

The heat pump 40 is a type of electric heat source. The heat pump 40 heats the hot water in the storage tank 30 by chilling in the atmosphere. The heat pump 40 is connected to the storage tank 30 through the heat storage transfer pipe 32 and the heat storage and return pipe 34. The warm water in the holding tank 30 is sent to the heat pump 40 through the heat storage transfer pipe 32. This hot water is heated by the heat pump 40 and then returned to the holding tank 30 through the heat storage and return pipe 34. As a result, the hot water is stored in the storage tank 30. The hot water in the holding tank 30 is not limited to the heat pump 40 but may be heated by another heat source such as a hot water heating unit 50 described later, a fuel cell, a generator, solar light, or an electric heater.

The water supply pipe (28) is connected to a hot water supply pipe (16) through a water supply bypass pipe (26). The water supply bypass pipe (26) mixes the tap water of the water supply pipe (28) with the hot water of the hot water supply pipe (16). A water supply mixing valve 24 is provided at a connection position between the water supply bypass pipe 26 and the hot water supply pipe 16. The water supply mixing valve 24 is connected to the controller 14 and its operation is controlled by the controller 14. [ The controller 14 controls the water supply mixing valve 24 to mix tap water with hot water from the storage tank 30 when the temperature of the hot water from the storage tank 30 is too high. As a result, the temperature of the hot water sent to the hot water supply location is lowered to the hot water set temperature designated by the user. The hot water supply pipe 16 is provided with a temperature sensor 22. The controller 14 is connected to the temperature sensor 22 and controls the operation of the water supply mixing valve 24 in accordance with the detected temperature of the temperature sensor 22. [

The hot water heating unit 50 is a kind of gas-like heat source that generates heat by consuming combustible gas such as city gas (also referred to simply as "gas"). The hot water heating unit (50) can heat the hot water flowing through the hot water supply pipe (16). The controller 14 ignites the burner (not shown) of the hot water heating unit 50 when the temperature of the hot water from the storage tank 30 is too low. As a result, the temperature of the hot water sent to the hot water supply location is raised to the hot water setting temperature designated by the user. The controller 14 controls the operation of the hot water supply heating unit 50 in accordance with the detected temperature of the temperature sensor 22.

A bypass pipe 18 is connected to the hot water supply pipe 16. The bypass pipe 18 is branched from the section 16b on the upstream side of the hot water supply heating unit 50 of the hot water supply pipe 16 to bypass the hot water supply heating unit 50, (16a) on the downstream side from the downstream side (50). Hot water from the holding tank 30 can be sent to the hot water supply location without passing through the hot water heating unit 50 by passing through the bypass pipe 18. [ Thus, unnecessary heat dissipation in the hot water heating unit (50) can be avoided when heating in the hot water heating unit (50) is not required.

A bypass control valve (20) is provided in the bypass pipe (18). The bypass control valve 20 is a kind of electric drive valve, specifically, a flow control valve capable of adjusting the opening degree by a stepping motor. The bypass control valve 20 is connected to the controller 14 and its operation is controlled by the controller 14. [ The controller 14 can bypass the hot water supply heating unit 50 by opening the bypass control valve 20 if heating by the hot water supply unit 50 is not required. Thus, unnecessary heat radiation from the hot water supply heating unit (50) can be avoided. The controller 14 adjusts the degree of opening of the bypass control valve 20 to send a part of the hot water to the hot water heating unit 50 and bypasses the remaining hot water to the hot water heating unit 50, Can be precisely adjusted.

A hot water supply valve (17) is provided in the hot water supply pipe (16). The hot water supply valve 17 is a kind of an electric drive valve, specifically a solenoid valve. The hot water supply valve 17 is connected to the controller 14, and its operation is controlled by the controller 14. The controller 14 can prevent the hot water from the storage tank 30 from passing through the hot water supply heating unit 50 by closing the hot water supply valve 17. [ At this time, if the bypass control valve 20 is opened, the whole amount of the hot water from the storage tank 30 is sent to the hot water supply place through the bypass pipe 18. Although the hot water supply valve 17 of this embodiment is provided at the connection position to the hot water supply heating unit 50 of the hot water supply pipe 16, it is not limited to this position. The hot water supply valve (17) can be installed in a section of the hot water supply pipe (16) in parallel with the bypass pipe (18). The section in parallel with the bypass tube 18 is a section from the position where the bypass tube 18 is branched to the position where the bypass tube 18 is joined. For example, the hot water supply valve 17 may be located in the hot water heating unit 50 or on the upstream side of the confluent portion of the bypass pipe 18 on the downstream side of the hot water heating unit 50.

In this embodiment, in order to take advantage of the bypass pipe 18, the path length (A in Fig. 1) of the hot water from the storage tank 30 to the hot water supply location via the hot water heating unit 50 is smaller than the path length (B in Fig. 1) of the hot water passing from the hot water supply pipe 30 to the hot water supply place via the bypass pipe 18 becomes shorter. Thus, unnecessary heat radiation can be suppressed when hot water is supplied through the bypass pipe (18).

The hot water supply heating unit 50 is connected to the heating terminal 70 and is capable of circulating the heating heat medium between the heating terminal 70 and the heating terminal 70. The heating terminal 70 is, for example, a floor heating panel or a bathroom heater. The heating medium for heating is, for example, an antifreeze. The heating heat medium is heated by the burner of the hot water heating unit 50 and then sent to the heating terminal 70 through the heat transfer pipe 60. The heating medium for heating released from the heating terminal 70 is returned to the hot water heating unit 50 through the heating return pipe 62.

The remote controller 12 is an operation terminal for the user to perform various operations. The user can perform various operations related to on / off of the power supply of the hot water heater 10, designation of the hot water set temperature, and heating operation by operating the remote controller 12. [ In addition, the remote controller 12 has a liquid crystal panel and can display various kinds of information.

With the above configuration, the hot water heating apparatus 10 of the present embodiment heats hot water in the storage tank 30 by the heat pump 40 in accordance with the hot water set temperature designated by the user. The hot water in the holding tank 30 is sent to the hot water supply location through the hot water pipe 16 and the bypass pipe 18. The temperature of the hot water from the holding tank 30 is detected by the temperature sensor 22 and is heated or mixed as required. Thereby, the temperature of the hot water sent to the hot water supply location is adjusted to the hot water setting temperature designated by the user.

In the filling tank 30, harmful bacteria may be generated, for example, when hot water stays over a long period of time. Thus, the controller 14 performs a high-temperature disinfection process when predetermined conditions are satisfied, for example, when hot water supply is not performed for a predetermined time. This high-temperature disinfection treatment is to heat the hot water in the holding tank 30 to a temporarily high temperature (60 DEG C in the present embodiment) by the heat pump 40 to kill the bacteria. In this case, the temperature of the hot water in the storage tank 30 may be much higher than the hot water setting temperature designated by the user. However, since water is mixed by the water supply mixing valve 24 as required, Is not erroneously heated.

However, when an abnormality occurs in the water supply mixing valve 24, it is not possible to normally perform the water supply by the water supply mixing valve 24, so that it is assumed that hot water is mistakenly supplied at a high temperature. Therefore, in the present embodiment, when the controller 14 detects an abnormality in the water supply and mixing valve 24, it is configured to perform the hot water supply interruption processing shown in Fig.

Hereinafter, the hot water supply interruption processing will be described in detail with reference to FIG. 2 and FIG. Here, the hot water shutoff process described below is always operated when an abnormality occurs in the water supply mixing valve 24 regardless of whether or not the high temperature disinfection process is performed.

First, in step S12 of FIG. 2, the controller 14 determines whether an abnormality has occurred in the water supply and mixing valve 24 or not. The specific determination method is not particularly limited. The controller 14 of the present embodiment is configured such that when the temperature of the hot water detected by the temperature sensor 22 is not lowered although the water is mixed through the water feed mixing valve 24 as an example, It is determined that an abnormality has occurred.

In the next step S14, the controller 14 firstly closes the bypass control valve 20. As shown in Fig. 3, this time is referred to as "t1 ". At this point, the hot water supply valve 17 is not closed. When the hot water supply valve 17 is firstly closed, the hot water from the hot water tank 30 is sent to the hot water supply point through the bypass pipe 18 as it is. On the other hand, when the hot water supply valve 17 is opened, at least a part of the hot water passes through the hot water supply heating unit 50, so that the hot water supply temperature can be lowered considerably by heat radiation by the hot water supply heating unit 50 have. The hot water supply path (A in Fig. 1) via the hot water supply unit 50 is longer than the hot water supply path (B in Fig. 1) via the bypass pipe 18, Can be relatively avoided.

Then, in step S16 of Fig. 2, the controller 14 waits for a predetermined delay time. The reason for this is as follows. The bypass control valve 20 of this embodiment is a flow control valve driven by a stepping motor as described above. Therefore, as shown in Fig. 3, the bypass control valve 20 requires a certain time? T from the fully opened state to the fully closed state. On the other hand, since the hot water supply valve 17 of this embodiment is a solenoid valve, the time required for closing is very short. Therefore, the process of this step S16 is prepared to wait for the bypass control valve 20 to be completely closed. The delay time at this time is preferably longer than the time? T required for closing the bypass control valve 20, for example. However, if it takes a certain time to close the hot water supply valve 17, the delay time can be shortened in consideration of the time.

In step S18 of Fig. 2, the controller 14 starts closing the hot water supply valve 17. Since the hot water supply valve 17 of this embodiment is a solenoid valve, its closing is immediately completed. As shown in Fig. 3, when this time is set to "t2 ", the time between the time t1 and the time t2 corresponds to the aforementioned delay time. It can be seen that the timing at which the bypass valve 20 closes at the time t2 and that the timing at which the bypass valve 20 closes is close to the timing at which the hot water valve 17 is closed.

Finally, in step S20 of Fig. 2, a display of the remote control 12 displays that an abnormality has occurred in the water supply mixing valve 24 and that the hot water supply is forcibly shut off.

As described above, in the hot water heating apparatus 10 of the present embodiment, when an abnormality occurs in the water supply mixing valve 24, the hot water supply path from the storage tank 30 is shut off, do. Here, since the hot water supply path from the storage tank 30 is branched into two systems, the hot water supply path from the storage tank 30 can be surely blocked by shutting off each system. Further, in addition to blocking these paths at the same time, in consideration of the degree of heat radiation in each of the paths, preference is given to the one having a smaller degree of heat radiation, thereby lowering the hot water for hot water supply.

While the embodiments of the present invention have been described in detail, the present invention is by way of example only and is not intended to limit the scope of the claims. The techniques described in the claims include various modifications and changes to the concrete examples described above. The technical elements described in the present specification or drawings exert their technical usefulness alone or in various combinations and are not limited to the combinations described in the claims at the time of filing the application. It is to be noted that the technique exemplified in the present specification or drawings can achieve a plurality of objectives at the same time, and achieving one of the objectives itself has technological usefulness.

10 - Hot water heating system 12 - Remote control
14 - Controller 16 - Hot water supply pipe
17 - Hot water valve 18 - Bypass tube
20 - Bypass control valve 22 - Temperature sensor
24 - Water mixing valve 26 - Water supply bypass pipe
28 - Water supply pipe 30 - Storage tank
32 - Heat storage transfer pipe 34 - Heat storage return pipe
36 - Temperature sensor 40 - Heat pump
50 - Hot water heating unit 60 - Heat transfer pipe
62 - heating return pipe 70 - heating terminal

Claims (5)

A low-temperature water tank for storing hot water,
A first heat source for heating the hot water of the filling means,
A hot water supply path for sending the hot water of the hot water storage means to the hot water supply point,
A water supply mixing valve for supplying water to the hot water flowing through the hot water supply path,
A second heat source for heating the hot water flowing through the hot water supply path,
A bypass path branching at a section upstream of the second heat source of the hot water supply path to bypass the second heat source and merging at a section downstream of the second heat source of the hot water supply path,
A first electric drive valve provided in the bypass path,
A second electric drive valve provided in a section in parallel with the bypass path of the hot water supply path,
And control means for controlling the first and second electric drive valves,
Wherein the control means closes all of the first and second electric drive valves when the abnormality of the water supply and mixing valve is detected and forcibly cuts off the hot water supply.
The method according to claim 1,
And the control means closes the second electric drive valve after closing the first electric drive valve.
The method according to claim 1,
Wherein the path length of the hot water from the filling means to the hot water place via the second heat source is shorter than the path length of hot water from the hot water means to the hot water place via the bypass path Hot water boiler.
The method of claim 2,
The control means starts closing the second electric drive valve after a predetermined time has elapsed from the time when the first electric drive valve is started to be closed,
Wherein the predetermined time is equal to or longer than a time required for bringing the first electrically operated valve from the fully opened state to the fully closed state.
The method according to any one of claims 1 to 4,
Wherein the first electric drive valve is a flow control valve capable of controlling a flow rate of the bypass path.

Images