JP7054815B2 - Water heater - Google Patents

Description

The present invention relates to a hot water storage type hot water supply device that stores hot water heated by a heating means in a hot water storage tank and uses it.

This type of water heater heats the water supplied from the bottom of the hot water tank by a heating means to a high temperature and stores it in the upper part of the hot water tank covered with a heat insulating material by repeating a series of cycles to store the entire hot water tank. Or store high temperature water in a part. When the user uses hot water to supply hot water, the temperature is adjusted to a predetermined temperature by mixing with unheated water and used at the hot water supply terminal.
The operating efficiency of the heat pump type heating means used here depends on the outside air temperature, the boiling temperature, and the incoming water temperature, which is the temperature of the water supplied to the heating means. Alternatively, the operating efficiency is improved when the water entry temperature is low. The outside air temperature fluctuates depending on the season and operating time, and in addition, the water entry temperature also fluctuates depending on the temperature state of the hot water storage tank.
In particular, when using a terminal that uses heat in the hot water storage tank such as a bath reheating or radiator, the hot water in the hot water storage terminal and the hot water in the hot water storage tank are exchanged for heat by a heat exchanger, and then the hot water in the hot water storage tank is used. It is configured to return to the bottom. Originally, low-temperature water at the bottom of the hot water storage tank exists at the same temperature as the water supply temperature, but when the heat utilization terminal is used, the hot water from the heat exchanger is the lower part of the hot water storage tank, that is, the low-temperature water. Therefore, medium-temperature hot water (medium-temperature water) having an intermediate temperature higher than the supply water temperature is generated at the lower part of the hot water storage tank. Since the medium hot water is supplied to the heating means at the time of boiling, the water entry temperature rises and the efficiency is significantly lowered.
The hot water supply device described in Patent Document 1 is provided with a medium-temperature water take-out pipe extending vertically from the upper end to the lower part of the hot-water storage tank inside the hot-water storage tank, and the water intake of the medium-temperature water take-out pipe is opened and closed at a medium-temperature water temperature. It is possible to improve the efficiency of the heating means at the time of boiling by providing a valve having a shape that allows the water to be taken in more positively.

Japanese Unexamined Patent Publication No. 2006-125677

However, unlike the water heater described in Patent Document 1, the hot water supply temperature changes abruptly only by opening and closing the opening, and it is not possible to supply hot water at a stable temperature to the user, and at the time of long-term non-use. When the water in the hot water storage tank is drained, residual water remains in the pipe, and when the outside air temperature drops to 0 ° C or less, there is a problem that the water freezes and breaks.

The present invention solves the conventional problems. In a water heater equipped with a medium-temperature hot water outlet for taking out medium-temperature water from a hot water storage tank, the water temperature stability on the user side is improved and the outside air temperature is 0 ° C. at the time of drainage. It is an object of the present invention to provide a hot water supply device capable of suppressing freezing and breaking of the medium temperature hot water outlet and surrounding pipes even if the temperature drops below.

In order to solve the conventional problem, the hot water supply device of the present invention according to claim 1 includes a hot water storage tank and a medium temperature hot water outlet portion for flowing out medium temperature water from the hot water storage tank. The switching unit is moved based on the plurality of openings for taking out the medium-temperature water from different heights in the hot water storage tank, the switching unit for changing the opening area of each of the plurality of openings, and the surrounding hot water temperature. It has a shape storage unit and a take-out part, mixes hot water flowing in from each of the openings at different temperatures, and causes hot water to have a predetermined temperature to flow out from the take-out part. Is composed of a tubular medium-temperature hot water outlet main body, and the first opening, the second opening, and the third opening are formed as the openings at different heights from the medium-temperature hot water outlet main body. As the switching unit, the first switching unit and the second switching unit move in the medium temperature hot water outlet main body, and as the shape storage unit, the first shape storage unit that moves the first switching unit and the second switching unit. It has a second shape storage unit for moving the unit, and by moving the first switching unit and the second switching unit , the first opening is closed, the second opening is opened, and the third. When the opening is open, the first opening is closed, the second opening is open, and the third opening is incompletely closed, the first opening is open, and the second opening is open. The first opening is open, the second opening is closed, and the third opening is incompletely closed. When the 3 openings are incompletely closed, the switching portion does not completely block the third opening.

According to the present invention, in a hot water supply device provided with a medium-temperature hot water outlet that preferentially takes out medium-temperature water from a hot water storage tank, it is possible to suppress overshoot of the hot water supply to the user side and supply hot water at a stable temperature. When the water in the hot water storage tank is drained, even if the outside air temperature drops to 0 degrees or less, the medium temperature hot water outlet and the surrounding piping can prevent freezing and breaking.

A block diagram showing a water heater according to the first embodiment of the present invention. Temperature distribution map with temperature on the horizontal axis and hot water tank height on the vertical axis Explanatory drawing which shows composition and operation of the medium temperature hot water outlet by Example 1. Enlarged view of the take-out part according to the first embodiment A block diagram showing the water heater according to the second embodiment of the present invention. Explanatory drawing which shows composition and operation of the medium temperature hot water outlet by Example 2. Enlarged view of the take-out part according to the second embodiment

The hot water supply device according to the first embodiment of the present invention includes a hot water storage tank and a medium temperature hot water outlet section for flowing out medium temperature hot water from the hot water storage tank, and the medium temperature hot water outlet section is provided with medium temperature hot water from different heights in the hot water storage tank. It has a plurality of openings for taking out, a switching unit for changing the opening area of each of the plurality of openings, a shape storage unit for moving the switching unit based on the ambient hot water temperature, and an extraction unit, respectively. The hot water that flows in from the opening at different temperatures is mixed and discharged from the hot water outlet at a predetermined temperature. The 1st opening, the 2nd opening, and the 3rd opening are formed at different heights from the medium temperature hot water outlet main body, and as switching portions, the 1st switching portion and the 2nd switching portion are inside the medium temperature hot water outlet main body. The shape storage unit has a first shape storage unit for moving the first switching unit and a second shape storage unit for moving the second switching unit, and the first switching unit and the second switching unit have. Due to the movement , the first opening is closed, the second opening is open, and the third opening is open, the first opening is closed, the second opening is open, and the third opening is incomplete. In the closed state, the first opening is open, the second opening is open, and the third opening is incompletely closed, the first opening is open, the second opening is closed, and the third opening is closed. The portion is incompletely closed, and in the incompletely closed state of the third opening, the switching portion does not completely close the third opening.
According to the present embodiment, since the opening at the lowest position of the medium temperature hot water outlet is opened by a predetermined area or more without being blocked, hot water having the lowest temperature is always mixed from the lowest position at the start of hot water supply. Even if the temperature of the upper part of the hot water storage tank is high, the temperature of the hot water supplied from the medium temperature hot water outlet immediately after the start can be lowered, the overshoot of the hot water supplied to the user can be suppressed, and the hot water at a stable temperature can be supplied. can.
In addition, when draining the water in the hot water storage tank, the hot water in the medium-temperature hot water outlet above the opening at the lowest position and the hot water in the connected pipe can be discharged by its own weight, and the outside air temperature rises. Even if the temperature drops below 0 ° C, it is possible to prevent the medium-temperature hot water outlet and surrounding pipes from freezing and breaking.

In the second embodiment of the present invention, in the water heater according to the first embodiment, all the openings are arranged above the height of the take-out portion.
According to the present embodiment, when the removal of the medium-temperature water is stopped, the low-temperature water radiated from the pipe outside the hot water storage tank flows into the take-out part, but since the take-out part is at a position lower than the opening, the inside of the hot water storage tank. It is possible to prevent cooling of hot water at a high temperature. Therefore, it is possible to prevent the hot water in the hot water storage tank from being reduced.

In the third embodiment of the present invention, in the water heater according to the first embodiment, the openings are arranged at different heights, one above the height of the take-out portion and the other below the height of the take-out portion. It was done.
According to this embodiment, it is possible to maintain the early supply of hot water at a predetermined temperature and the temperature distribution in the hot water storage tank at the time of taking out the medium hot water, and prevent the decrease of the high temperature water in the hot water storage tank at the time of stopping the taking out of the medium hot water. can.

Hereinafter, the hot water supply device according to the embodiment of the present invention will be described.
FIG. 1 is a configuration diagram showing a water heater according to the first embodiment.
The hot water supply device according to the present embodiment includes a hot water storage tank 1, a heating means 2 for heating the water in the hot water storage tank 1, a hot water supply port 3 for flowing out hot water (high temperature water) in the hot water storage tank 1, and a hot water storage tank 1. It is provided with a heat exchanger 4 that uses the high temperature water in the room as a heating source. The heat utilization terminal 5 utilizes a heat medium heated by the heat exchanger 4.
A water supply pipe 11 is connected to the lower part of the hot water storage tank 1. The hot water storage tank 1 always maintains a constant amount of hot water supplied from the water supply pipe 11. The connection end 11a of the water supply pipe 11 is the hot water storage tank connection position of the water supply pipe 11.

As the heating means 2, for example, a heat pump device can be used. The hot water storage tank 1 and the heating means 2 are connected by a water discharge pipe 21 and a return pipe 22. One end of the water pipe 21 is connected to the lower part of the hot water storage tank 1, and the other end is connected to the heating means 2. One end of the return pipe 22 is connected to the heating means 2, and the other end is connected to the upper part of the hot water storage tank 1. The low-temperature hot water (low-temperature water) existing in the lower part of the hot water storage tank 1 is guided to the heating means 2 by the water discharge pipe 21. The high-temperature water heated by the heating means 2 is returned to the upper part of the hot water storage tank 1 by the return pipe 22.
The hot water supply port 3 is connected to the hot water storage tank 1 by the first hot water outlet pipe 31. The first hot water outlet pipe 31 has one end 31a connected to the upper part of the hot water storage tank 1 and the other end connected to the hot water supply port 3. The hot water existing in the upper part of the hot water storage tank 1 is guided to the hot water supply port 3 by the first hot water outlet pipe 31. One end 31a of the first hot water pipe 31 is a hot water storage tank connection position of the first hot water pipe 31.

The first hot water discharge pipe 31 is provided with a first mixing valve 6 and a second mixing valve 7. The first mixing valve 6 is provided on the upstream side of the second mixing valve 7, that is, on the hot water storage tank 1.
A second hot water pipe 32 is connected to the first mixing valve 6. One end of the second hot water discharge pipe 32 is connected to the vertical intermediate portion of the hot water storage tank 1, and the other end is connected to the first mixing valve 6. The medium-temperature hot water (medium-temperature water) existing in the vertical intermediate portion of the hot water storage tank 1 is guided to the first mixing valve 6 by the second hot water outlet pipe 32.
A water supply branch pipe 12 is connected to the second mixing valve 7. One end of the water supply branch pipe 12 is connected to the water supply pipe 11, and the other end is connected to the second mixing valve 7. The low temperature water supplied from the water supply branch pipe 12 is guided to the second mixing valve 7.
High-temperature water flows into the first mixing valve 6 from the first hot water pipe 31, and medium-temperature water flows into the first hot water pipe 32. The inflowing high-temperature water and medium-temperature water are mixed by the first mixing valve 6 and then guided to the second mixing valve 7.
Hot water from the first mixing valve 6 and low-temperature water from the water supply branch pipe 12 flow into the second mixing valve 7. The hot water and the low temperature water from the first mixing valve 6 are guided to the hot water supply port 3 after being mixed by the second mixing valve 7.

The hot water storage tank 1 and the heat exchanger 4 are connected by a heat utilization hot water discharge pipe 41 and a heat utilization return pipe 42. One end of the heat utilization hot water discharge pipe 41 is connected to the upper part of the hot water storage tank 1, and the other end is connected to the heat exchanger 4. One end of the heat utilization return pipe 42 is connected to the heat exchanger 4, and the other end 42a is connected to the vertical intermediate portion of the hot water storage tank 1. The other end 42a of the heat utilization return pipe 42 is the hot water storage tank connection position of the heat utilization return pipe 42. A circulation pump 43 is provided in the heat utilization return pipe 42. The high temperature water existing in the upper part of the hot water storage tank 1 is guided to the heat exchanger 4 by the heat utilization hot water outlet pipe 41. The medium-temperature water radiated by the heat exchanger 4 is returned to the intermediate portion in the vertical direction of the hot water storage tank 1 by the heat utilization return pipe 42.

The heat exchanger 4 and the heat utilization terminal 5 are connected by a heat medium supply pipe 51 and a heat medium return pipe 52. One end of the heat medium supply pipe 51 is connected to the heat exchanger 4, and the other end is connected to the heat utilization terminal 5. One end of the heat medium return tube 52 is connected to the heat utilization terminal 5, and the other end is connected to the heat exchanger 4. A circulation pump 53 is provided in the heat medium return pipe 52. The heat medium of the heat utilization terminal 5 is guided to the heat exchanger 4 by the heat medium return tube 52. The heat medium heated by the heat exchanger 4 is supplied to the heat utilization terminal 5 by the heat medium supply pipe 51.

A medium-temperature hot water outlet unit 60 is arranged in the hot water storage tank 1.
The medium temperature hot water outlet portion 60 has a plurality of openings 61a, 61b, 61c and a take-out portion 62.
The plurality of openings 61a, 61b, 61c are arranged in the hot water storage tank 1 in the substantially vertical direction. The take-out section 62 is connected to the second hot water discharge pipe 32.
All the openings 61a, 61b, 61c are arranged between the hot water storage tank connection position 31a of the first hot water pipe 31 and the hot water storage tank connection position 11a of the water supply pipe 11. By disposing the plurality of openings 61a, 61b, 61c in the vertical intermediate portion of the hot water storage tank 1, medium-temperature water having different temperatures can be taken out.
According to this embodiment, since the medium-temperature hot water outlet unit 60 can mix hot water of different temperatures in the hot water storage tank 1 and take out the medium-temperature water, it is possible to increase the amount of medium-temperature water taken out, which is not suitable for hot water supply. .. Therefore, the amount of high-temperature water taken out from the upper part of the hot water storage tank 1 can be reduced, and a hot water supply device with high energy saving can be provided.

The hot water that has flowed in from at least two of the openings 61a, 61b, and 61c at different temperatures is mixed and flows out from the outlet 62 to the second hot water pipe 32.

The hot water storage tank connection position 42a of the heat utilization return pipe 42 is set to the height between the opening 61a at the highest position and the opening 61c at the lowest position. In this way, the position of the hot water returning from the heat utilization return pipe 42 to the hot water storage tank 1 is set to the height between the opening 61a at the highest position and the opening 61c at the lowest position, thereby utilizing heat. Since the medium-temperature water that flows into the hot water storage tank 1 from the return pipe 42 and diffuses can be taken out from the openings 61a, 61b, 61c having different heights and used for hot water supply, particularly when a heat pump device is used as the heating means 2. It is possible to provide a hot water supply device with excellent energy saving by suppressing the amount of boiling of medium-temperature water whose efficiency decreases at the time of boiling.

The hot water storage tank connection position 42a of the heat utilization return pipe 42 is preferably set to be equal to or higher than the height of the opening 61b located at the next highest position after the opening 61a at the highest position. Since the medium-warm water flowing into the hot water storage tank 1 from the heat utilization return pipe 42 has a higher specific density than the high-temperature water, it diffuses more downward than the hot water storage tank connection position 42a of the heat utilization return pipe 42. By providing more openings 61b and 61c arranged below the hot water storage tank connection position 42a of the heat utilization return pipe 42 than the opening 61a arranged above the hot water storage tank connection position 42a of the heat utilization return pipe 42. Many medium-temperature water can be taken out.

2A and 2B show a temperature distribution map in which the horizontal axis is the temperature and the vertical axis is the height of the hot water storage tank, FIG. 2A is the case of this embodiment, and FIG. 2B is the case of the comparative example. T1 is the water supply temperature, T2 is the temperature of the medium-temperature water, the solid line is the temperature distribution before the hot water is discharged from the medium-temperature hot water outlet 60, and the broken line is the temperature distribution when the hot water is discharged from the medium-temperature hot water supply unit 60.
As shown in FIG. 2A, by taking out the medium-temperature water from the opening 61b and the opening 61c, as shown in FIG. 2B, as compared with the case where the medium-temperature water is taken out only from the opening 61b. It can be seen that the medium-temperature water can be effectively used and the amount of medium-temperature water that is boiled, which is less efficient at the time of boiling, can be suppressed.

FIG. 3 is an explanatory diagram showing the configuration and operation of the medium temperature hot water outlet according to the first embodiment.

The configuration of the medium temperature hot water outlet unit 60 will be described with reference to FIG.
The medium-temperature hot water outlet portion 60 includes a plurality of openings 61a, 61b, 61c, 61d, a take-out portion 62, and switching portions 63a, 63b for changing the opening areas of the plurality of openings 61a, 61b, 61c, 61d, respectively. It has shape storage units 64a and 64b that move the switching units 63a and 63b based on the temperature of the surrounding hot water. The opening 61d flows in hot water flowing from the opening 61b or the opening 61c, or hot water flowing from the opening 61b and the opening 61c, and guides the hot water to the take-out portion 62.

The plurality of openings 61a, 61b, 61c, 61d are formed in the tubular medium-temperature hot water outlet main body 65. The opening 61a communicates with the upper end opening 65b of the medium temperature hot water outlet main body 65. The opening 61d is formed above the opening 61c. The opening 61a is formed above the opening 61d.
Mixing portions 66c and 66d are formed in the medium temperature hot water outlet main body 65.
The mixing portion 66c is formed below the opening 61b and above the opening 61d. The mixing portion 66d is formed below the opening 61c.

The switching portion 63a changes the opening area between the opening 61a and the opening 61b by moving in the height direction.
A shape storage unit 64a is arranged below (downstream side) the switching unit 63a. The shape storage unit 64a moves the switching unit 63a downward when the ambient hot water temperature becomes lower than the predetermined temperature.

The switching portion 63b changes the opening area between the opening 61d and the opening 61c by moving in the height direction.
A shape storage unit 64b is arranged below (downstream side) the switching unit 63b. The shape storage unit 64b moves the switching unit 63b downward when the ambient hot water temperature becomes lower than the predetermined temperature. As shown in the figure, it is preferable to move the switching portion 63a together with the shape storage portion 64a by using the urging spring 67a. By using the urging spring 67a together with the shape storage unit 64a, it is possible to match the operating temperature at the time of raising the temperature and the time of lowering the temperature. Further, it is preferable to move the switching unit 63b by using the urging spring 67b together with the shape storage unit 64b. By using the urging spring 67b together with the shape storage unit 64b, it is possible to match the operating temperature at the time of raising the temperature and the time of lowering the temperature.

The operation of the medium-temperature hot water outlet main body 65 when the hot water temperature in the take-out unit 62 is set to 40 ° C. will be described below. The shape storage units 64a and 64b are set to operate in the shrinking direction when the ambient hot water temperature falls below 40 ° C.

FIG. 3A shows a state in which the hot water temperature at the opening 61c of the medium temperature hot water outlet main body 65 is 45 ° C.
Since the hot water temperature at the opening 61c is higher than 40 ° C., the shape storage unit 64b is in an extended state, and the switching unit 63b is moving upward. In the state where the switching portion 63b is moved upward, the opening portion 61c is opened and the opening portion 61d is closed.
Further, the shape storage unit 64a is located higher than the opening 61c, and the temperature of the hot water around the shape storage unit 64a is also higher than 40 ° C., so that the shape storage unit 64a is in an extended state, and the switching unit 63a is moving upward. When the switching portion 63a is moved upward, the opening 61b is open and the opening 61a is closed.
In the state of FIG. 3A, hot water flows in from the opening 61c and is guided to the take-out portion 62 through the mixing portion 66d.

FIG. 3B shows a state in which the hot water temperature at the opening 61c of the medium-temperature hot water outlet main body 65 has dropped to 20 ° C.
When the hot water temperature at the opening 61c of the medium-temperature hot water outlet main body 65 drops, the hot water temperature around the shape storage unit 64b drops, so that the shape storage unit 64b shrinks and the switching unit 63b moves downward.
As the switching portion 63b moves downward, the opening area of the opening 61c decreases, and the opening 61d starts opening. Since the opening 61b is open, hot water at 60 ° C. flows into the opening 61d from the opening 61b. As the opening area of the opening 61c decreases, the inflow of water at 20 ° C. decreases, and as the opening area of the opening 61d increases, the inflow of hot water at 60 ° C. increases. The opening of the opening 61d raises the temperature of the hot water around the shape storage unit 64b, and the switching unit 63b moves so that the hot water temperature around the shape storage unit 64b becomes 40 ° C.
In the state of FIG. 3B, hot water flows in from the opening 61c and the opening 61d, passes through the mixing portion 66d, and is guided to the take-out portion 62.

FIG. 3C shows a state in which the hot water temperature at the opening 61b has dropped to 40 ° C.
When the hot water temperature at the opening 61b drops to 40 ° C., the hot water temperature around the shape storage unit 64b falls below 40 ° C. due to the inflow of hot water from the opening 61b, so that the shape storage unit 64b shrinks and the switching unit 63b. Moves downwards.
By moving the switching portion 63b downward, the opening 61c is closed and only the opening 61d is opened.
In the state of FIG. 3C, hot water flows into the opening 61d only from the opening 61b and is guided to the take-out portion 62 through the mixing portion 66d.

FIG. 3D shows a state in which the hot water temperature at the opening 61b is lower than 40 ° C., for example, 20 ° C.
When the hot water temperature at the opening 61b drops to 20 ° C., the hot water temperature around the shape storage unit 64a falls below 40 ° C., so that the shape storage unit 64a shrinks and the switching unit 63a moves downward.
As the switching portion 63a moves downward, the opening area of the opening 61b decreases, and the opening 61a starts opening. As the opening area of the opening 61b decreases, the inflow of water at 20 ° C. decreases, and as the opening area of the opening 61a increases, the inflow of hot water at 60 ° C. increases. The opening of the opening 61a raises the temperature of the hot water around the shape storage unit 64a, and the switching unit 63a moves so that the hot water temperature around the shape storage unit 64a becomes 40 ° C.
In the state of FIG. 3D, hot water flows in from the opening 61b and the opening 61a, passes through the mixing portion 66c, the opening 61d, and the mixing portion 66d in this order, and is guided to the take-out portion 62.

FIG. 3 (e) shows a state in which the hot water temperature at the opening 61a has dropped to 40 ° C.
When the hot water temperature at the opening 61a drops to 40 ° C., the hot water temperature around the shape storage unit 64a falls below 40 ° C. due to the inflow of hot water from the opening 61b, so that the shape storage unit 64a shrinks and the switching unit 63a Moves downwards.
When the switching portion 63a moves downward, the opening portion 61b is closed and only the opening portion 61a is opened.
In the state of FIG. 3 (e), the hot water flows in only from the opening 61a, passes through the mixing portion 66c, the opening 61d, and the mixing portion 66d in this order, and is guided to the take-out portion 62.

In this embodiment, the operating temperature of the shape storage unit 64a and the shape storage unit 64b is set to the same 40 ° C., but the operating temperature of the shape storage unit 64b may be set higher than that of the shape storage unit 64a. .. When the take-out part 62 is located at a position lower than the shape storage part 64b, if the temperature of the hot water from the opening 61b or the opening 61c is 40 ° C., the hot water temperature in the take-out part 62 is lower than 40 ° C. By setting the operating temperature of the shape storage unit 64b to a temperature higher than 40 ° C., the set temperature in the extraction unit 62 can be maintained.

FIG. 4 shows an enlarged view of the periphery of the switching unit 63b.
The switching portion 63b changes the opening area between the opening 61c and the opening 61d, but there is a gap between the opening 61c and the medium temperature hot water outlet main body 65, and the opening 61c is not completely closed.
As shown in FIG. 4A, when the hot water temperature at the opening 61c decreases, the hot water temperature around the shape storage portion 64b falls below 40 ° C., the shape storage portion 64b shrinks, and the opening area of the opening 61d becomes larger. Although it becomes larger, the opening 61c is not completely closed, so that a small amount of water flows in from the opening 61c.
As a result, even when high-temperature water flows in from the opening 61d, a small amount of low-temperature water is mixed through the opening 61c, so that the fluctuation range of the hot water temperature at the take-out portion 62 can be reduced.
As a result, the fluctuation range of the hot water temperature can be reduced on the user side as well, and there is an effect that hot water having a stable temperature can be supplied to the user.
In addition, since the opening 61c located at the lowermost part of the medium-temperature hot water outlet 60 is not completely blocked, when the hot water in the hot water storage tank 1 is drained, the hot water and the take-out portion 62 in the medium-temperature hot water outlet 60 are used. As shown in FIG. 4B, the hot water in the second hot water pipe 32 connected via the hot water is discharged from the opening 61c by its own weight.
As a result, after the water in the hot water storage tank 1 is discharged, the residual water inside the medium temperature hot water outlet portion 60 and the second hot water outlet pipe 32 can be reduced as much as possible, and the residual water can be reduced even under low outside air temperature conditions. It has the effect of suppressing the destruction of the medium-temperature hot water outlet 60 and the second hot water pipe 32 due to freezing.

FIG. 5 is a configuration diagram showing a water heater according to the second embodiment. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
In this embodiment, the opening 61a is arranged above the height of the take-out portion 62, the opening 61b is arranged at the same height as the take-out portion 62, and the opening 61c is arranged below the height of the take-out portion 62. By arranging the openings 61a, 61b, 61c at different heights above the height of the take-out portion 62 and below the height of the take-out portion 62, hot water having a predetermined temperature at the time of taking out the medium-temperature water is provided. It is possible to maintain the early supply and the temperature distribution in the hot water storage tank 1, and it is possible to prevent the decrease of the high temperature water in the hot water storage tank 1 when the take-out of the medium hot water is stopped.

FIG. 6 is an explanatory diagram showing the configuration and operation of the medium temperature hot water outlet according to the second embodiment. A part of the description common to the first embodiment will be omitted.
The configuration of the medium temperature hot water outlet unit 60 will be described with reference to FIG. 6A.
The switching portion 63b changes the opening area between the opening 61d and the opening 61c by moving in the horizontal direction.
A shape storage unit 64b is arranged on the downstream side of the switching unit 63b. The shape storage unit 64b moves the switching unit 63b to the downstream side when the ambient hot water temperature becomes lower than the predetermined temperature.

The operation of the medium-temperature hot water outlet main body 65 when the hot water temperature in the take-out unit 62 is set to 40 ° C. will be described below. The shape storage units 64a and 64b are set to operate in the shrinking direction when the ambient hot water temperature falls below 40 ° C.

FIG. 6A shows a state in which the hot water temperature at the lower end opening 65a of the medium temperature hot water outlet main body 65 is 45 ° C.
Since the hot water temperature at the opening 61c is higher than 40 ° C., the shape storage unit 64b is in an extended state, and the switching unit 63b is moved to the upstream side. When the switching portion 63b is moved to the upstream side, the opening portion 61c is open and the opening portion 61d is closed.
Further, the shape storage unit 64a is located higher than the opening 61c, and the temperature of the hot water around the shape storage unit 64a is also higher than 40 ° C., so that the shape storage unit 64a is in an extended state, and the switching unit 63a is moving upward. When the switching portion 63a is moved upward, the opening 61b is open and the opening 61a is closed.
In the state of FIG. 6A, hot water flows in from the opening 61c and is guided to the take-out portion 62 through the mixing portion 66d.

FIG. 6B shows a state in which the hot water temperature at the opening 61c of the medium-temperature hot water outlet main body 65 has dropped to 20 ° C.
When the hot water temperature at the opening 61c of the medium-temperature hot water outlet main body 65 drops, the hot water temperature around the shape storage unit 64b drops, so that the shape storage unit 64b shrinks and the switching unit 63b moves to the downstream side.
As the switching portion 63b moves to the downstream side, the opening area of the opening 61c decreases, and the opening 61d starts opening. Since the opening 61b is open, hot water at 60 ° C. flows into the opening 61d from the opening 61b. As the opening area of the opening 61c decreases, the inflow of water at 20 ° C. decreases, and as the opening area of the opening 61d increases, the inflow of hot water at 60 ° C. increases. The opening of the opening 61d raises the temperature of the hot water around the shape storage unit 64b, and the switching unit 63b moves so that the hot water temperature around the shape storage unit 64b becomes 40 ° C.
In the state of FIG. 6B, hot water flows in from the opening 61c and the opening 61d, passes through the mixing portion 66d, and is guided to the take-out portion 62.

FIG. 6C shows a state in which the hot water temperature at the opening 61b has dropped to 40 ° C.
When the hot water temperature at the opening 61b drops to 40 ° C., the hot water temperature around the shape storage unit 64b falls below 40 ° C. due to the inflow of hot water from the opening 61c, so that the shape storage unit 64b shrinks and the switching unit 63b. Moves to the downstream side.
By moving the switching portion 63b to the downstream side, the opening portion 61c is closed and only the opening portion 61d is opened.
In the state of FIG. 6C, hot water flows into the opening 61d only from the opening 61b and is guided to the take-out portion 62 through the mixing portion 66d.

FIG. 6D shows a state in which the hot water temperature at the opening 61b is lower than 40 ° C., for example, 20 ° C.
When the hot water temperature at the opening 61b drops to 20 ° C., the hot water temperature around the shape storage unit 64a falls below 40 ° C., so that the shape storage unit 64a shrinks and the switching unit 63a moves downward.
As the switching portion 63a moves downward, the opening area of the opening 61b decreases, and the opening 61a starts opening. As the opening area of the opening 61b decreases, the inflow of water at 20 ° C. decreases, and as the opening area of the opening 61a increases, the inflow of hot water at 60 ° C. increases. The opening of the opening 61a raises the temperature of the hot water around the shape storage unit 64a, and the switching unit 63a moves so that the hot water temperature around the shape storage unit 64a becomes 40 ° C.
In the state of FIG. 6D, hot water flows in from the opening 61b and the opening 61a, passes through the mixing portion 66c, the opening 61d, and the mixing portion 66d in this order, and is guided to the take-out portion 62.

FIG. 6 (e) shows a state in which the hot water temperature at the opening 61a has dropped to 40 ° C.
When the hot water temperature at the opening 61a drops to 40 ° C., the hot water temperature around the shape storage unit 64a falls below 40 ° C. due to the inflow of hot water from the opening 61b, so that the shape storage unit 64a shrinks and the switching unit 63a Moves downwards.
When the switching portion 63a moves downward, the opening portion 61b is closed and only the opening portion 61a is opened.
In the state of FIG. 6 (e), the hot water flows in only from the opening 61a, passes through the mixing portion 66c, the opening 61d, and the mixing portion 66d in this order, and is guided to the take-out portion 62.

FIG. 7 shows an enlarged view of the periphery of the switching unit 63b.
As shown in FIG. 7A, the switching portion 63b changes the opening area between the opening 61c and the opening 61d, but there is a gap between the opening 61c and the medium temperature hot water outlet main body 65, and the opening 61c is complete. It is configured so that it does not block.
When the hot water temperature at the opening 61c decreases, the hot water temperature around the shape storage portion 64b falls below 40 ° C., the shape storage portion 64b shrinks and the opening area of the opening 61d increases, but the opening 61c becomes larger. Since it is configured not to be completely closed, it operates so that a small amount of water flows in from the opening 61c.
As a result, even when high-temperature water flows in from the opening 61d, a small amount of low-temperature water is mixed through the opening 61c, so that the fluctuation range of the hot water temperature at the take-out portion 62 can be reduced.
As a result, the fluctuation range of the hot water temperature can be reduced on the user side as well, and there is an effect that hot water having a stable temperature can be supplied to the user.
In addition, since the opening 61c located at the lowermost part of the medium-temperature hot water outlet 60 is not completely blocked, when the hot water in the hot water storage tank 1 is drained, the hot water and the take-out portion 62 in the medium-temperature hot water outlet 60 are used. As shown in FIG. 7B, the hot water in the second hot water pipe 32 connected via the hot water is discharged from the opening 61c by its own weight.
As a result, after the water in the hot water storage tank 1 is discharged, the residual water inside the medium temperature hot water outlet portion 60 and the second hot water outlet pipe 32 can be reduced as much as possible, and the residual water can be reduced even under low outside air temperature conditions. It has the effect of suppressing the destruction of the medium-temperature hot water outlet 60 and the second hot water pipe 32 due to freezing.

When the heat of the hot water in the hot water storage tank is used in the heat utilization terminal, the hot water supply device according to the present invention reduces the decrease in efficiency due to the use in the heat utilization terminal, improves the stability of the hot water temperature on the user side, and drains water. Since it suppresses freezing breakage even when the outside air temperature later becomes 0 degrees or less, it can be applied not only to household hot water supply equipment but also to large-scale applications such as commercial use, and can provide excellent energy saving.

1 Hot water storage tank 2 Heating means 3 Hot water supply port 4 Heat exchanger 5 Heat utilization terminal 6 First mixing valve 7 Second mixing valve 11 Water supply pipe 11a Connection end (hot water storage tank connection position)
12 Water supply branch pipe 21 Outlet pipe 22 Return pipe 31 First hot water pipe 31a Hot water storage tank connection position 32 Second hot water outlet pipe 41 Heat utilization hot water outlet pipe 42 Heat utilization return pipe 42a The other end (hot water storage tank connection position)
43 Circulation pump 51 Heat medium supply pipe 52 Heat medium return pipe 53 Circulation pump 60 Medium temperature hot water outlet 61a Opening (first opening)
61b opening (second opening)
61c opening (third opening)
61d, 61Xd Opening part 62 Extraction part 63a Switching part (first switching part)
63b Switching unit (second switching unit)
64a Shape storage unit (first shape storage unit)
64b Shape storage unit (second shape storage unit)
65 Medium temperature hot water outlet main body 65a Lower end opening 65b Upper end opening 66c, 66d Mixing part 67a, 67b Bounce spring

Claims (3)

With a hot water tank
A medium-temperature hot water outlet that discharges medium-temperature water from the hot water storage tank,
Equipped with
The medium-temperature hot water section is
A plurality of openings for taking out the medium-temperature water from different heights in the hot water storage tank, and
A switching unit that changes the opening area of each of the plurality of openings,
A shape storage unit that moves the switching unit based on the temperature of the surrounding hot water,
It has a take-out part and
Hot water flowing in from each of the openings at different temperatures is mixed and mixed.
Hot water at a predetermined temperature is discharged from the take-out part.
The medium-temperature hot water outlet portion is composed of a tubular medium-temperature hot water outlet main body.
As the opening, the first opening, the second opening, and the third opening are formed at different heights from the main body of the medium temperature hot water outlet.
As the switching unit, the first switching unit and the second switching unit move within the medium temperature hot water outlet main body.
The shape storage unit includes a first shape storage unit for moving the first switching unit and a second shape storage unit for moving the second switching unit.
By moving the first switching unit and the second switching unit,
The first opening is closed, the second opening is open, and the third opening is open.
The first opening is closed, the second opening is open, and the third opening is incompletely closed.
The first opening is open, the second opening is open, and the third opening is incompletely closed.
The first opening is open, the second opening is closed, and the third opening is incompletely closed.
A water heater characterized in that the third opening is not completely closed by the switching portion in a state where the third opening is incompletely closed. The hot water supply device according to claim 1, wherein all the openings are arranged at a height equal to or higher than the height of the take-out portion. The hot water supply device according to claim 1, wherein the opening is arranged at different heights at a height equal to or higher than the height of the take-out portion and at a height equal to or lower than the height of the take-out portion.

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