JP3058691U - Heat exchange water heater - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a heat exchange type hot water supply device in which high temperature water obtained by a heat exchanger is circulated in a heat exchange water supply pipe and low temperature high temperature water is obtained at an outlet of the heat exchange water supply pipe. provide. The present invention provides a heat exchanger (5) for turning water into hot water by steam, and a mixing valve (30) for mixing water supplied from a water supply port with high-temperature water obtained by the heat exchanger.
A circulating pump (50) between an outlet and an inlet of a heat exchange water supply pipe (4) in the heat exchanger.
This circulation pump is activated by the flow switch detecting that the amount of water supplied from the water supply port is less than a predetermined amount, and heats the high-temperature water at the heat exchange water supply pipe outlet of the heat exchanger. It is configured to circulate to the inlet of the replacement water supply pipe and average the temperature of the hot water in the heat exchange water supply pipe.
As a result, the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 can be lowered, and the durability of the mixing valve (30) can be increased.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a heat exchange type hot water supply apparatus, and more particularly, to a circulating pump between an outlet and an inlet of a heat exchange water supply pipe of a heat exchanger for supplying hot water by indirectly heating water using steam. The present invention relates to a heat exchange type hot water supply device for averaging the temperature of hot water in a heat exchange water supply pipe of a heat exchanger.

[0002]

[Prior art]

 FIG. 3 is a configuration diagram showing a conventional heat exchange type hot water supply apparatus. In FIG. 3, reference numeral 31 denotes a water inlet for taking in water from a water channel, and 1 denotes water which is not discharged from the Y-type strainer 2 and the water supply pipe when the pipe inserted into the water inlet 31 is removed for construction and maintenance. 2 is a Y-type strainer for preventing dust and the like contained in the water, and 3 is a backflow of water stored in a heat exchange water supply pipe 4 and a water supply pipe of a heat exchanger 5. A check valve 4 for preventing the water from being supplied from the water supply port 31 to high-temperature water is provided for a heat exchange water supply pipe, and a heat exchange steam pipe 26 is provided between the heat exchange water supply pipe 4 and the heat exchange water supply pipe 4. A heat exchanger 41 for performing heat exchange is a flow switch for detecting whether or not the amount of water supplied from the water supply port 31 is equal to or more than a predetermined value.

[0003] Reference numeral 30 denotes a mixing valve that mixes water from a water supply pipe with high-temperature water warmed by a heat exchange water supply pipe 4 and supplies hot water at a predetermined set temperature; 32, a hot water outlet that supplies hot water; This is a hot water feed stop valve for preventing hot water stored in the hot water pipe at the outlet of the mixing valve 30 from being discharged when the pipe inserted into the hot water outlet 32 is removed for construction and maintenance. Reference numeral 42 denotes a first thermal switch for detecting the temperature of high-temperature water at the outlet of the heat exchange water supply pipe 4, and reference numeral 43 denotes a second thermal switch for detecting the temperature of hot water at the outlet of the mixing valve 30. Reference numeral 7 denotes a water gauge for displaying the temperature and pressure of the hot water pipe, reference numeral 29 denotes a high-temperature water blocking valve for preventing outflow of high-temperature water, and reference numeral 36 denotes a high-temperature water supply port for taking out high-temperature hot water (high-temperature water).

[0004] Reference numeral 33 denotes a steam supply port for supplying steam, and reference numeral 21 denotes a pipe for preventing water accumulated in the Y-type strainer 22 or the like from being discharged when a pipe inserted into the steam supply port 33 is removed for construction and maintenance. , A Y-type strainer for preventing dust and the like contained in the steam, and 23, a steam switch according to a combination of control signals from a flow switch 41, a first thermal switch 42, and a second thermal switch 43. Valve for turning on and off the supply of water, 26 is a steam pipe for heat exchange for applying heat to the water pipe 4 for heat exchange and converting water to hot water, 27 is a temperature setting and temperature setting site at the installation site of the heat exchange hot water supply apparatus. A test valve 28 is provided to easily test the equipment. When the temperature of the drain accumulated in the pipe drops to some extent, the drain is automatically released to the outside. The steam strap 34 to be discharged is a drain outlet.

[0005] The conventional heat exchange type hot water supply device is roughly divided into a water system and a steam system. The heat exchanger 5 is a device for indirectly exchanging heat between the water system and the steam system. First, a description will be given of a water system in which water is heat-exchanged into hot water in a conventional heat exchange-type hot water supply apparatus.

In FIG. 3, water is supplied from a water supply port 31 and enters a heat exchange water supply pipe 4 of a heat exchanger 5 via a water supply prevention valve 1, a Y-strainer 2, a flow switch 41, and a check valve 3. Guided to the mouth. Furthermore, the high-temperature water that has exited the outlet of the heat exchange water supply pipe 4 is sent to the mixing valve 30. Here, the mixing valve 30 mixes the water from the water supply pipe with the high-temperature water warmed by the heat exchange water supply pipe 4 and supplies hot water at a predetermined set temperature. The hot water mixed by the mixing valve 30 is supplied from the hot water outlet 32 through the hot water feed inhibiting valve 12. On the other hand, high-temperature water is supplied from the high-temperature water supply port 36 through the high-temperature water check valve 29.

Next, the steam system will be described. The high-temperature steam is supplied from a steam supply port 33 and is guided to a heat exchange steam pipe 26 of the heat exchanger 5 via a steam check valve 21, a Y-strainer 22, and an on-off valve 23. In the heat exchanger 5, heat exchange is performed indirectly between the heat exchange steam pipe 26 and the heat exchange water supply pipe 4, and the steam in the heat exchange steam pipe 26 is changed into low-temperature steam and hot water. It is discarded from the drain outlet 34 via the steam strap 28.

As described above, in the conventional heat exchange type hot water supply apparatus, heat exchange is performed between the heat exchange water supply pipe 4 of the heat exchanger 5 and the heat exchange steam pipe 26 to obtain high-temperature water, and The hot water was supplied by mixing the high-temperature water and the water at the step 30.

Next, the operation of the conventionally devised on-off valve 23 will be described. The on-off valve 23 is turned on (when the flow of water is sensed), turned off (when the temperature of the high-temperature water is lower than the set temperature), and turned off (when the temperature of the high-temperature water is lower than the set temperature). It is opened when the temperature of the hot water is not abnormally high) and sends steam to the steam pipe 26 for heat exchange. On the other hand, regardless of whether the flow switch 41 is on or off, the on-off valve 23 is turned on when the first thermal switch 42 is turned on (when the temperature of the high-temperature water exceeds the set temperature) or when the second thermal switch 43 is turned on. At this time (when the temperature of the hot water is abnormally high), it is closed, and the steam is prevented from being sent to the heat exchange steam pipe 26.

FIG. 4 shows a conventional heat exchange type hot water supply apparatus, in which hot water is supplied from a hot water outlet 32 for a predetermined time and then the supply of hot water is stopped. It is a schematic diagram of a time change of the hot water temperature at the outlet 32. In FIG. 4, when the supply of hot water from the hot water outlet 32 is stopped, the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 is maintained at a high level and does not easily fall in a short time. On the other hand, the temperature of the hot water from the hot water outlet 32 gradually decreases after the supply of the hot water from the hot water outlet 32 stops.

[0011]

[Problems to be solved by the invention]

 In the conventional heat exchange type hot water supply apparatus as described above, since water is supplied to the inlet of the heat exchange water supply pipe 4, the temperature is low, and the heat exchange water supply pipe 4 has the heat exchange steam pipe 26 at the outlet. Since the heated high-temperature water is supplied, the temperature is high. Even when hot water is not used at the hot water outlet 32, the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 is maintained at a high level in a short time, and the high-temperature hot water is supplied to the mixing valve 30. Have been. Further, when the temperature change of the high-temperature water at the outlet of the heat exchange water supply pipe 4 was large, the operation of the mixing valve 30 was increased accordingly. For this reason, there have been drawbacks such as deterioration of the built-in thermostat and packing of the mixing valve 30 for many months. The present invention reduces the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 as much as possible and supplies it to the mixing valve 30. It is an object of the present invention to provide a heat exchange type hot water supply device that increases the durability of the mixing valve 30 by reducing the size.

[0012]

[Means for Solving the Problems]

 The heat exchange type hot water supply device of the present invention is provided with a circulation pump between the outlet and the entrance of the heat exchange water supply pipe in the heat exchanger, and the circulation pump controls the amount of water supplied from the water supply port by the flow switch. Activated by detecting that the temperature has dropped below the fixed amount, the high-temperature water at the outlet of the heat exchange water pipe of the heat exchanger is circulated to the inlet of the heat exchange water pipe, and the temperature of the hot water in the heat exchange water pipe is reduced. It is configured to average.

Further, the heat exchange type hot water supply apparatus of the present invention has a temperature sensor at an outlet of a heat exchange water supply pipe provided in the heat exchanger, and a temperature control valve at a steam supply pipe for supplying steam to the heat exchanger. The temperature sensor senses the temperature of the high-temperature water at the outlet of the heat exchange water pipe provided in the heat exchanger, and adjusts the opening of the temperature control valve according to the temperature of the hot water to exchange heat. The temperature of the hot water at the outlet of the vessel is configured to be adjusted to a predetermined value.

Further, in the heat exchange type hot water supply apparatus of the present invention, the circulation pump is further configured to be stopped after a predetermined time.

Further, the circulation pump in the heat exchange type hot water supply device of the present invention is further configured to be activated when the heat exchange type hot water supply device is turned on.

Further, the heat exchange type hot water supply apparatus of the present invention includes a first thermal switch, and the first thermal switch determines that the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe is equal to or higher than a predetermined value. It is configured to open the on-off valve when sensing.

Further, the heat exchange type hot water supply apparatus of the present invention includes a second thermal switch, and when the second thermal switch detects that the temperature at the outlet of the mixing valve is abnormal, the open / close valve is opened. It is configured to close.

Further, the heat exchange type hot water supply device of the present invention is provided with a high temperature water check valve and a high temperature water supply port, and supplies high temperature hot water supplied from the heat exchange water supply pipe directly to the hot water outlet. Is done.

Further, the heat exchange type hot water supply apparatus of the present invention is provided with an automatic air vent valve between an outlet of the heat exchange water supply pipe and an inlet of the circulation pump, so that air contained in the water supply pipe is automatically discharged. It is composed.

[0020]

[Embodiment of the invention]

 Embodiment 1 FIG. FIG. 1 is a configuration diagram of a heat exchange type hot water supply apparatus according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 50 denotes a circulating pump for circulating high-temperature water at the outlet of the heat exchange feed pipe of the heat exchanger to the inlet of the heat exchange feed pipe, 51 denotes a check valve, and 8 denotes a heat exchange feed pipe 4. This is a safety valve that releases hot water and air inside the pipe to release the pressure inside the pipe for safety when the pressure of the hot water pipe including the pipe exceeds a predetermined value. 1, the same reference numerals as those in FIG. 3 denote the same elements or devices, and a detailed description thereof will be omitted.

[0021] The heat exchange type hot water supply device of the present invention is roughly divided into a water system and a steam system as in the conventional device. First, a description will be given of a water system in which heat is exchanged into hot water in the heat exchange type hot water supply device of the present invention.

In FIG. 1, water is supplied from a water supply port 31 and enters a heat exchange water supply pipe 4 of a heat exchanger 5 via a water supply prevention valve 1, a Y-strainer 2, a flow switch 41, and a check valve 3. Guided to the mouth. Further, the high-temperature water that has exited the outlet of the heat exchange water supply pipe 4 is sent to the mixing valve 30 and the circulation pump 50. The mixing valve 30 mixes the water from the water supply pipe with the high-temperature water heated by the heat exchange water supply pipe 4 and supplies hot water at a predetermined set temperature. The hot water mixed by the mixing valve 30 is supplied from the hot water outlet 32 through the hot water feed inhibiting valve 12. On the other hand, high-temperature water is supplied from a high-temperature water supply port 36 through a high-temperature water check valve 29. Here, the safety valve 8 can be installed in the hot water pipe as required. The safety valve 8 operates when the pressure in the hot water pipe exceeds a predetermined value, for example, when the on-off valve 23 fails or steam leaks from the on-off valve 23 due to foreign matter mixed in the on-off valve 23, Drain hot water and air out. Accordingly, when the amount of hot water in the hot water pipe decreases, the flow switch 41 operates to supply water from the water supply port 31 into the heat exchange water supply pipe 4, and the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4. Function to lower.

The circulation pump 50 circulates the high-temperature water at the outlet of the heat exchange water supply pipe 4 to the inlet of the heat exchange water supply pipe 4 through the check valve 51 in the direction shown by the arrow. When hot water is supplied from the hot water outlet 32, most of the hot water goes to the mixing valve 30, and only a small amount of hot water circulates in the circulation pump 50. On the other hand, when the supply of hot water from the hot water outlet 32 is stopped, all of the hot water circulates through the circulation pump 50.

There are three methods for starting the circulation pump 50. The first method is to start the circulation pump 50 immediately when hot water is no longer supplied from the hot water outlet 32, and the second is to start the circulation pump 50 immediately when hot water is no longer supplied from the hot water outlet 32, A third method is to stop the circulating pump 50 with a certain delay time, and a third method is to turn on the power of the heat exchange type hot water supply device and start the circulating pump 50 at the same time. Here, whether or not hot water is supplied from the hot water outlet 32 can be detected by the flow switch 41. That is, when hot water is supplied from the hot water outlet 32, water is supplied from the water supply port 31, so that the flow switch 41 is turned on, and when hot water is not supplied from the hot water outlet 32, water is not supplied from the water supply port 31. Therefore, the flow switch 41 is turned off. Therefore, whether or not hot water is supplied from the hot water outlet 32 can be detected using the flow switch 41.

In the first method, when hot water is no longer supplied from the hot water outlet 32, the circulation pump 50 is started immediately, and the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 immediately drops. After that, the circulating pump 50 continues to operate, so that the power consumption increases and the circulating pump 50 is wastefully operated, so that the circulating pump 50 deteriorates for a long time.

FIG. 5 shows that in the first method, the temperature of the hot water at the outlet of the heat exchange water supply pipe 4 and the hot water outlet 32 when the circulation pump 50 is started as soon as hot water is supplied from the hot water outlet 32. FIG. 4 is a schematic diagram showing the time lapse of the temperature of hot water. In the first method, when the supply of hot water from the hot water outlet 32 is stopped, the circulation pump 50 is started immediately, so that the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 drops rapidly. On the other hand, the temperature of the hot water from the hot water outlet 32 gradually decreases after the supply of the hot water from the hot water outlet 32 stops. In FIG. 5, the temperature of the hot water at the outlet of the heat exchange water supply pipe 4 and the temperature of the hot water at the outlet of the hot water outlet 32 while hot water is supplied from the hot water outlet 32 are respectively 70 ° C. ± 10 ° C. Although it is drawn to change at C and 38 ° C ± 1 ° C, it actually changes variously depending on the capacity of the heat exchanger and the like, but an example is shown here.

In the second method, the circulation pump 50 is activated as soon as hot water is no longer supplied from the hot water outlet 32. When the circulation pump 50 is started, the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 immediately decreases. Thereafter, after a predetermined delay time, the post-circulation pump 50 is stopped to reduce power consumption.

FIG. 6 shows that in the second method, the circulation pump 50 is started as soon as hot water is no longer supplied from the hot water outlet 32, and the heat exchange water supply when the circulation pump 50 is stopped after a predetermined time has elapsed. FIG. 4 is a schematic diagram showing the temperature of hot water at the outlet of the pipe 4 and the temperature of the hot water outlet 32 over time. In the second method, the supply of hot water from the hot water outlet 32 is stopped, and the circulating pump 50 is stopped when the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 drops to some extent. Can be reduced. Since the temperature of the high-temperature water at the outlet of the heat-exchange water supply pipe 4 greatly decreases in the early stage of the operation of the circulating pump 50, the high-temperature water at the outlet of the heat-exchange water supply pipe 4 is heat-exchanged to some extent, for example, about 20 seconds. The temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 is reduced by being mixed with the water at the inlet of the water supply pipe 4. Therefore, even if the circulation pump 50 is operated any longer, the effect of the temperature drop is small, so the circulation pump 50 is stopped. 6 is the same as that of FIG. 5 until the circulation pump 50 is stopped.

In the third method, the circulation pump 50 is started at the same time as the power supply of the heat exchange water heater is turned on, and thereafter the circulation pump 50 is constantly operated. In this method, since the circulation pump 50 is constantly operated, the power consumption is large. However, since the circulation pump 50 does not need to be turned on and off, there is an advantage that the circulation pump 50 is not forced.

FIG. 7 is a diagram showing the lapse of time of the temperature of the hot water at the outlet of the heat exchange water supply pipe 4 and the temperature of the hot water at the hot water outlet 32 in a state where the circulation pump 50 is constantly operated in the third method. It is. In the case of FIG. 6, even while hot water is being supplied from the hot water outlet 32, averaging of the hot water in the heat exchange water supply pipe 4 is performed, so that compared with the case where the circulation pump 50 is not constantly operated. The peak value of the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 can be kept low by several degrees. In FIG. 7, the temperature of the hot water at the outlet of the heat exchange water supply pipe 4 and the temperature of the hot water at the outlet of the hot water outlet 32 while hot water is supplied from the hot water outlet 32 are 70 ° C. ± 6 °, respectively. Although it is drawn to change at C and 38 ° C ± 1 ° C, it actually changes variously depending on the capacity of the heat exchanger and the like, but an example is shown here. 4 to 7, the temperature of the hot water at the outlet of the heat exchange water supply pipe 4 and the temperature of the hot water at the outlet of the hot water outlet 32 are drawn in the same phase. However, in an actual apparatus, the temperature of the hot water at the outlet of the hot water outlet 32 is slightly delayed in phase from the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 due to the operation delay of the mixing valve 30. Then we ignore that delay. FIG. 7 shows the variation width of the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 because the circulation pump 50 constantly averages the hot water in the heat exchange water supply pipe 4 as compared with FIGS. Becomes smaller. In this method, the power consumption is increased, but the peak temperature of the high-temperature water supplied to the mixing valve 30 is constantly lowered, so that there is an advantage that the life of the mixing valve 30 is extended. Further, in the case where the on-off valve 23 is broken and steam is constantly leaking, the peak temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 is reduced to some extent by always operating the circulation pump 50. Therefore, the life of the mixing valve 30 can be further extended. Furthermore, when the peak temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 decreases, the amplitude of the high-temperature water at the exit of the heat exchange water supply pipe 4 also decreases, and the life of the mixing valve 30 can be further extended. .

Next, the steam system will be described. The high-temperature steam is supplied from a steam supply port 33 and is guided to a heat exchange steam pipe 26 of the heat exchanger 5 via a steam check valve 21, a Y-strainer 22, and an on-off valve 23. In the heat exchanger 5, heat is exchanged indirectly between the heat exchange steam pipe 26 and the heat exchange water supply pipe 4, and the steam in the heat exchange steam pipe 26 is changed into low-temperature steam and hot water. It is discarded from the drain outlet 34 through the steam strap 28. The on-off valve 23 is activated when both the first thermal switch 42 and the second thermal switch 43 are not operating (when the temperature of the high-temperature water is lower than the set temperature and the temperature of the hot water is abnormally high). When the switch 41 is turned on, it is opened to send steam to the heat exchange steam pipe 26.

When the first thermal switch 42 senses that the temperature of the high-temperature water has exceeded the set temperature, or when the second thermal switch 43 senses that the temperature of the hot water is abnormally high, The on-off valve 23 is closed to prevent the steam from being sent to the heat exchange steam pipe 26.

As described above, in the heat exchange type hot water supply apparatus of the present invention, the peak temperature of the high temperature water at the outlet of the heat exchange water supply pipe 4 can be reduced by providing the circulation pump 50. Thus, the life of the mixing valve 30 can be extended.

Embodiment 2 FIG. 2 is a configuration diagram of a heat exchange type hot water supply apparatus according to Embodiment 2 of the present invention. The second embodiment incorporates control by a temperature control valve sensor and a temperature control valve in addition to the control by the first embodiment. In FIG. 2, reference numeral 6 denotes a temperature control valve sensor for detecting the temperature of high-temperature water at the outlet of a heat exchange water supply pipe provided in a heat exchanger. This is a temperature control valve for adjusting the temperature. 2, the same reference numerals as those in FIGS. 1 and 3 denote the same elements or devices, and a detailed description thereof will be omitted.

The heat exchange type hot water supply device of the present invention will be described by dividing into a water system and a steam system as in the first embodiment. First, the water system in the heat exchange type hot water supply device of the present invention, in which water is exchanged to make hot water, will be described.

In FIG. 2, water is supplied from a water supply port 31, and enters a heat exchange water supply pipe 4 of a heat exchanger 5 via a water supply prevention valve 1, a Y-strainer 2, a flow switch 41, and a check valve 3. Guided to the mouth. Further, the high-temperature water that has exited the outlet of the heat exchange water supply pipe 4 is sent to the mixing valve 30 and the circulation pump 50. The mixing valve 30 mixes the water from the water supply pipe with the high-temperature water heated by the heat exchange water supply pipe 4 and supplies hot water at a predetermined set temperature. The hot water mixed by the mixing valve 30 is supplied from the hot water outlet 32 through the hot water feed inhibiting valve 12. On the other hand, high-temperature water is supplied from a high-temperature water supply port 36 through a high-temperature water check valve 29. Here, the safety valve 8 can be installed in the hot water pipe as required.

The circulation pump 50 circulates the high-temperature water at the outlet of the heat exchange water supply pipe 4 to the inlet of the heat exchange water supply pipe 4 through the check valve 51 in the direction shown by the arrow. The operation of the circulating pump 50 is the same as that of the first embodiment, and a detailed description thereof will be omitted.

In the second embodiment, the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe 4 is further detected by the temperature sensor 6, and the opening of the temperature control valve 25 is adjusted based on the temperature to control the steam flow. The amount is adjusted so that the amount of steam flowing into the heat exchange steam pipe 26 is more finely controlled and the temperature change of the hot water at the outlet of the heat exchange water supply pipe 4 is reduced.

In the second embodiment, the high-temperature water is controlled by proportional control using the temperature sensor 6 and the temperature control valve 25, and the mixing valve 30 having high temperature adjustment accuracy is used. Thus, warm water having a smaller temperature change can be obtained.

Next, the steam system will be described. The high-temperature steam is supplied from a steam supply port 33, and is guided to a heat exchange steam pipe 26 of the heat exchanger 5 via a steam check valve 21, a Y-strainer 22, an on-off valve 23 and a temperature control valve 25. The other parts than the temperature control valve 25 are the same as those in the first embodiment, and thus detailed description is omitted, and only the operation of the temperature control valve 25 will be described here. The temperature control valve 25 changes the opening degree of the valve according to the temperature detected by the temperature sensor 6, that is, the temperature control valve 25 is throttled when the temperature is high, and the temperature control valve 25 is widened when the temperature is low. The amount of water flowing into the heat exchange steam pipe 26 is controlled.

As described above, in the second embodiment, the temperature of the high-temperature water is controlled by proportional control using the temperature sensor 6 and the temperature control valve 25 in addition to the control of the first embodiment. That is, the temperature of the high-temperature water at the outlet of the heat-exchange water supply pipe 4 is less varied than in the first embodiment, and hot water with a smaller temperature change is obtained at the hot-water outlet 32. As described above, according to the second embodiment, it is possible to obtain more accurate temperature characteristics than in the first embodiment.

[0042]

[Effect of the invention]

 As described above, the heat exchange type hot water supply apparatus of the present invention is provided with a circulation pump between the outlet and the inlet of the heat exchange water supply pipe in the heat exchanger, and the circulation pump is supplied with the flow switch from the water supply port. It is activated by detecting that the amount of water has dropped below a predetermined amount, and circulates high-temperature water at the outlet of the heat exchange feed pipe of the heat exchanger to the inlet of the heat exchange feed pipe, thereby Since the configuration is such that the temperature of the hot water in the water supply pipe is averaged, the temperature change of the hot water at the outlet of the heat exchange water pipe can be reduced, and the temperature of the hot water at the heat exchange water pipe outlet can be lowered. As a result, the durability of the mixing valve can be improved.

The heat exchange type hot water supply apparatus of the present invention has a temperature sensor at the outlet of a heat exchange water supply pipe provided in the heat exchanger, and a temperature control valve at a steam supply pipe for supplying steam to the heat exchanger. The temperature sensor senses the temperature of the high-temperature water at the outlet of the heat exchange water pipe provided in the heat exchanger, and adjusts the opening of the temperature control valve according to the temperature of the hot water to exchange heat. Since the temperature of the hot water at the outlet of the heat exchanger is configured to be adjusted to a predetermined value, the peak temperature of the hot water at the outlet of the heat exchange water pipe can be lowered, and the high temperature of the hot water at the outlet of the heat exchange water pipe can be reduced. Since the temperature change of the mixing valve 30 can be further reduced, the durability of the mixing valve 30 can be further enhanced.

Further, in the heat exchange type hot water supply apparatus of the present invention, the circulation pump is further configured to be stopped after a predetermined time, so that the power consumption of the entire apparatus can be reduced.

In the heat exchange type hot water supply device of the present invention, the circulation heat exchange type hot water supply device is always operated during the operation to lower the peak temperature of the high temperature water supplied to the mixing valve and to reduce the amplitude of the high temperature water. Can be smaller. As a result, the life of the mixing valve can be extended.

In addition, the heat exchange type hot water supply device of the present invention opens and closes the on-off valve when the first thermal switch detects that the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe is equal to or higher than a predetermined value. Since it is configured to open, it is possible to prevent the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe from rising above a predetermined value.

Further, the heat exchange type hot water supply apparatus of the present invention is configured to close the on-off valve when the second thermal switch detects that the temperature of the outlet of the mixing valve is abnormal. Hot water with an abnormal temperature can be prevented from being supplied from the hot water outlet.

Further, the heat exchange type hot water supply apparatus of the present invention is provided with the high temperature water check valve and the high temperature water supply port, and is configured to directly supply the high temperature hot water output from the heat exchange water supply pipe. There is an advantage that high-temperature hot water can be obtained separately from hot water.

Further, the heat exchange type hot water supply apparatus of the present invention is provided with an automatic air vent valve between the outlet of the heat exchange water supply pipe and the inlet of the circulation pump so that the air contained in the water supply pipe is automatically discharged. As a result, good operation of the circulation pump can be guaranteed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a heat exchange type hot water supply apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a heat exchange type hot water supply apparatus according to a second embodiment of the present invention.

FIG. 3 is a view showing a configuration of a conventional heat exchange type hot water supply apparatus.

FIG. 4 is a diagram showing temperature characteristics of a conventional heat exchange type hot water supply apparatus.

FIG. 5 is a diagram showing a temperature characteristic of the heat exchange type hot water supply device when the circulation pump 50 is instantaneously activated when the supply of hot water is stopped in the present invention.

FIG. 6 is a diagram showing the temperature characteristics of the heat exchange type hot water supply device when the circulation pump 50 is instantaneously activated when the supply of hot water is stopped and the circulation pump 50 is stopped after a predetermined delay time in the present invention. .

FIG. 7 is a diagram showing temperature characteristics of the heat exchange type hot water supply device when the circulation pump is constantly operated in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water supply check valve, 2 ... Y-strainer, 3 ... Check valve, 4
... water supply pipe for heat exchange, 5 ... heat exchanger, 6 ... temperature sensor,
7 ... water level gauge, 8 ... safety valve, 11 ... automatic air release valve, 12 ...
Hot water feed check valve, 21 ... Steam check valve, 22 ... Y-strainer, 23 ... Open / close valve, 25 ... Temperature control valve, 26 ... Steam pipe for heat exchange, 27 ... Test valve, 28 ... Steam strap, 2
9: High-temperature water check valve, 30: Mixing valve, 31: Water supply port, 32: Hot water outlet, 33: Steam supply port, 34: Drain outlet, 36: High-temperature water supply port, 41: Flow switch,
42 first thermal switch, 43 second thermal switch, 50 circulating pump, 51 check valve

Claims (8)

[Utility model registration claims] 1. A water supply port for supplying water, a flow switch provided on a detection pipe, a steam supply port for supplying steam, and a valve when the flow switch senses a certain amount of water supplied from the water supply port. An on-off valve for opening and supplying steam, a heat exchanger for heating water with steam, a mixing valve for mixing water supplied from a water supply port with hot water obtained by the heat exchanger, and a mixing valve for mixing water supplied from the heat exchanger. In a heat exchange type hot water supply apparatus provided with a hot water outlet for supplying hot water and a drain outlet for discharging steam after heat exchange, a circulation pump is provided between an outlet and an inlet of a heat exchange water supply pipe in the heat exchanger. The circulation pump is activated by the flow switch detecting that the amount of water supplied from the water supply port is equal to or less than a predetermined amount, and removes high-temperature water from the heat exchange water supply pipe outlet of the heat exchanger. heat A heat exchange type hot water supply device, wherein the hot water supply device is circulated to an inlet of a replacement water supply pipe to average the temperature of hot water in the heat exchange water supply pipe. 2. A heat exchange type hot water supply apparatus according to claim 1, further comprising: a temperature sensor at an outlet of a heat exchange water supply pipe provided in the heat exchanger, and a steam supply pipe for supplying steam to the heat exchanger. The temperature sensor senses the temperature of the high-temperature water at the outlet of the heat exchange water supply pipe provided in the heat exchanger, and adjusts the opening of the temperature control valve according to the temperature of the hot water. A temperature of the hot water at the outlet of the heat exchanger is adjusted to a predetermined value. 3. The heat exchange type hot water supply apparatus according to claim 1, wherein the circulation pump is further stopped after a predetermined time. 4. The heat exchange water heater according to claim 1, wherein the circulation pump is further activated when the heat exchange water heater is turned on. . 5. The heat exchange type hot water supply apparatus according to claim 1, further comprising a first thermal switch, wherein a temperature of the hot water at an outlet of the heat exchange water supply pipe is adjusted. A heat exchange type hot water supply apparatus characterized in that an on-off valve is opened when the first thermal switch detects that the temperature is equal to or more than a predetermined value. 6. The heat exchange type hot water supply apparatus according to claim 5, further comprising a second thermal switch, wherein the second thermal switch detects that the temperature at the outlet of the mixing valve is abnormal. A heat exchange type hot water supply device characterized by closing an on-off valve. 7. The heat exchange type hot water supply apparatus according to claim 1, further comprising: a high temperature water check valve and a high temperature water supply port, and directly supplying high temperature hot water supplied from the heat exchange water supply pipe to the hot water outlet. A heat exchange type hot water supply device, characterized in that it is supplied to a hot water supply device. 8. The heat exchange type hot water supply device according to claim 1, further comprising: an automatic air vent valve between an outlet of the heat exchange water supply pipe and an inlet of the circulation pump, for discharging air contained in the water supply pipe. A heat exchange type hot water supply device that automatically discharges water.