JP4482580B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that boils hot water using, for example, a heat pump cycle and stores the boiled hot water in a hot water storage tank.

Conventionally, as this type of hot water storage type hot water supply device, hot water of low temperature water (for example, 5 ° C.) is taken out from the lower side of the hot water storage tank, and hot water (for example, 90 ° C.) boiled using a heat pump cycle is used in the hot water storage tank. It is known that the hot water is returned from the upper side to the hot water storage tank, and the medium temperature water generated by the temperature diffusion of the hot water in the hot water storage tank is taken out to the outside by a water intake pipe extending vertically in the hot water storage tank and used for hot water supply. (For example, Patent Document 1).
In this case, the intake pipe has a double pipe structure in which the outer cylinder or the inner cylinder is rotatable, and intake holes that can communicate with each other at predetermined rotation positions are provided at different height positions around the outer cylinder and the inner cylinder. In addition, the warm water stored at a predetermined height in the hot water storage tank is taken out by rotating the outer cylinder or the middle cylinder.

JP 2006-57916 A

However, such a hot water storage type hot water supply apparatus can take out the medium-temperature water only from one place of a predetermined height.
Therefore, when the temperature of the medium temperature water in the hot water storage tank is lower than the required hot water supply temperature (for example, 50 ° C.), the medium temperature water cannot be taken out from the hot water storage tank and used as hot water, and is sealed as it is. Stored in the hot water storage tank, the proportion of medium-temperature water below the required hot water supply temperature in the hot water storage tank increases, and the proportion of hot water in the hot water storage tank decreases accordingly, resulting in a lack of high-temperature water. There was a problem of doing.
In addition, when trying to heat this medium temperature water to about 90 ° C. with a heat pump in order to eliminate the shortage of high temperature water, the energy consumption efficiency (COP) indicated by the amount of heating / power consumption is when heating the low temperature water. There are also problems that the temperature difference is small and the COP is low.

  An object of the present invention is to solve the above-described problems, and even if the medium temperature water generated in the hot water storage tank is lower than the required hot water supply temperature, the medium temperature water is stored in the hot water storage tank. An object of the present invention is to obtain a hot water storage type hot water supply apparatus that can be taken out and used as hot water without being stored inside, can solve the shortage of high temperature water in the hot water storage tank, and has a high COP.

  A hot water storage type hot water supply apparatus according to the present invention comprises a hot water storage tank in which hot water is stored, a heating means for heating the hot water sent from the hot water storage tank, and the hot water provided in the hot water storage tank so as to extend vertically. An intake pipe that leads to the outside, and a hot water tap that guides the hot water after being taken out of the hot water storage tank, and the intake pipe has an upper side formed at least in the vicinity of the upper part of the hot water storage tank A water intake hole and an intermediate water intake hole formed below the upper water intake hole are formed.

  According to the hot water storage type hot water supply apparatus according to the present invention, even if the temperature of the intermediate temperature water in the hot water storage tank is lower than the required hot water temperature, the intermediate temperature water can be taken out from the hot water storage tank and used as hot water. The ratio of the medium temperature water in the hot water storage tank can be greatly reduced, the shortage of hot water in the hot water storage tank can be solved, and a high COP can be ensured.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or equivalent members and parts will be described with the same reference numerals.
Embodiment 1. FIG.
1 is a block diagram showing a hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention.
This hot water storage type hot water supply apparatus includes a hot water storage tank unit 1 having a hot water storage tank 2 in which hot water is stored, a heat pump unit 3 as a heating means for heating hot water in the hot water storage tank 2, and hot water supply used in a kitchen or a washroom. And a stopper 4.

The heat pump refrigerant circuit of the heat pump unit 3 includes a compressor, a refrigerant-water heat exchanger that is a condenser, an electronic expansion valve, and a forced air-cooled evaporator.
Carbon dioxide, which is a natural refrigerant compressed by the compressor, dissipates and liquefies by the refrigerant-water heat exchanger, expands under reduced pressure by the electronic expansion valve, vaporizes and evaporates by atmospheric heat in the evaporator, and returns to the compressor again. It flows and becomes 1 cycle operation.
The lower part of the hot water storage tank 2 and the heat pump unit 3 are connected by a low temperature water extraction pipe 9. Further, the hot water storage tank 2 and the heat pump unit 3 are connected by a high-temperature water return pipe 10. A temperature sensor 23 and a high temperature water inflow valve 6 are attached to the high temperature water return pipe 10.
During this one-cycle operation, in the heat pump refrigerant circuit, low-temperature water (for example, 5 ° C.) is heated to high-temperature water (for example, 90 ° C.) via a refrigerant-water heat exchanger.

  In the hot water storage tank 2, a cylindrical water intake pipe 38 having a bottom portion extending in the vertical direction (vertical direction) is provided. A hot water temperature sensor 34 is provided on the outer peripheral surface of the hot water storage tank 2 to detect the temperature in the vertical direction of the hot water in the hot water storage tank 2. In this embodiment, five hot water temperature sensors 34a, 34b, 34c, 34d, and 34e are attached at predetermined intervals in the vertical direction.

Further, one end portion of the intake water distribution pipe 27 is connected to the upper end portion of the intake pipe 38 which is an intake pipe body. The other end of the intake water distribution pipe 27 is connected to the first valve portion of the high-temperature water mixing three-way valve 28. The second valve portion of the high-temperature water mixing three-way valve 28 is connected to one end portion of the tap water pipe 7. The other end of the hot water supply pipe 7 is connected to the upper part of the hot water storage tank 2, and the hot water in the hot water storage tank 2 flows out through the hot water supply pipe 7. The third valve portion of the high-temperature water mixing three-way valve 28 is connected to one end portion of the first valve downstream pipe 5. A hot water temperature sensor 29 for detecting the temperature of hot water flowing through the first valve downstream pipe 5 is attached to the first valve downstream pipe 5.
The other end portion of the first valve downstream pipe 5 is connected to the first valve portion of the low-temperature water mixing three-way valve 30. The second valve portion of the low-temperature water mixing three-way valve 30 is connected to the second valve downstream pipe 32. In the vicinity of the low-temperature water mixing three-way valve 30 of the second valve downstream pipe 32, a hot water temperature sensor 33 is attached, and a hot water tap 4 is attached downstream. A third valve portion of the low temperature water mixing three-way valve 30 is connected to a hot water supply pipe 31.

  The hot water supply water pipe 31 is connected to the water supply pipe 8. A pressure pump (not shown) is attached to the water supply pipe 8, and by driving the pressure pump, low-temperature water is pumped into the hot water storage tank 2 and also flows into the hot water supply water pipe 31. . The temperature of the low-temperature water is detected by a feed water temperature sensor 37 attached to the feed water pipe 8.

FIG. 2 is an overall perspective view of the intake pipe 38 which is the intake pipe body shown in FIG.
The intake pipe 38 has an upper intake hole 40 formed in the vicinity of the upper portion of the hot water storage tank 2 where the high temperature water 15 is located, and an intermediate intake hole 43 formed below the upper intake hole. The intermediate water intake hole 43 is provided at a height at which the intermediate warm water 16 is likely to accumulate in the hot water storage tank 2. Further, the opening area of the upper intake hole 40 is larger than the opening area of the intermediate intake hole 43.

Next, the operation of the hot water storage type hot water supply apparatus having the above configuration will be described.
The hot water storage tank 2 is filled with hot water, and high temperature water 15, medium temperature water 16, and low temperature water 17 are stored from above.
In this embodiment, for example, the temperature of the high temperature water 15 is about 90 ° C. when heated by the heat pump unit 3, and the temperature of the low temperature water 17 is about 5 ° C. as hot water flowing through the water supply pipe 8. The intermediate temperature water 16 is stored with a temperature gradient by thermal diffusion from the high temperature water 15.
Here, the intermediate temperature water 16 has a small temperature difference compared with the case where the low temperature water 17 is heated, and the COP of the heat pump unit 3 is lower than that when the hot water is heated. Therefore, the intermediate warm water 16 is not sent to the heat pump unit 3 and heated there, but is required to use it as hot water supply in order to ensure a high COP.

When the user of the hot water supply sets the required hot water supply temperature, for example, 50 ° C., the hot water temperature sensors 34a to 34e provided in the height direction are provided on the side surface of the hot water storage tank 2 so that the intermediate water intake hole 43 is placed in the middle. Determine if hot water is present. Here, the height of the intermediate water intake hole 43 and the hot water temperature sensor 34c are equal.
For example, if the hot water temperature sensor 34b is 90 ° C, the hot water temperature sensor 34c is 40 ° C, and the hot water temperature sensor 34d is 5 ° C, the temperature of the hot water temperature sensor 34c is higher than 5 ° C and lower than 90 ° C. It can be determined that there is medium-temperature water near the height of the temperature sensor 34c. Further, when the temperature sensors 34 are larger than 5 ° C. and smaller than 90 ° C., it may be determined that the medium temperature water exists at the position of the temperature sensor 34 showing a value close to the required hot water supply set temperature. Further, in the case where the hot water temperature sensor 34c is 90 ° C. and the hot water temperature sensor 34d is 5 ° C., and there is no hot water temperature sensor 34 having a temperature higher than 5 ° C. and lower than 90 ° C. May determine that medium temperature water exists between the hot water temperature sensor 34c and the hot water temperature sensor 34d where the temperature difference becomes the largest.
When it is determined that the medium temperature water 16 of 40 ° C. is present at the height of the hot water temperature sensor 34 c, the medium temperature water 16 is taken out from the intermediate water intake hole 43 using the intake pipe 38. At this time, since the upper intake hole 40 is provided on the upper side in the tank, the high temperature water 15 is also taken out from the upper intake hole 40 at the same time.

FIG. 3 is a graph showing changes with time in the hot water temperature when the inventor takes out hot water in the hot water storage tank 2 using the water pipe 38.
The horizontal axis shows the elapsed time since the start of taking out hot water from the intake pipe 38, and the vertical axis shows the temperature change of hot water taken out from the intake pipe 38. The thick line in the figure corresponds to the case where hot water is taken out from the upper water intake hole 40 and the intermediate water intake hole 43 in this embodiment, and the thin line corresponds to the case where hot water is taken out only from the intermediate water intake hole 43.

  The temperature distribution in the height direction of the medium-temperature water 16 varies greatly from approximately 5 ° C. to 90 ° C. Moreover, although the amount of the medium-temperature water 16 depends on the operation method of the hot water storage type hot water supply apparatus, there are cases where the amount of the hot water is small relative to the amount of hot water stored in the entire tank. Therefore, as shown in FIG. 3, when hot water is taken out only from the intermediate water intake hole 43, the low-temperature water 17 is replenished through the water supply pipe 8 by the amount of hot water flowing out from the hot water storage tank 2, and the water level in the intermediate water intake hole 43. In this case, the low temperature water 17 reaches, and the temperature of the hot water rapidly decreases with time. Naturally, the temperature of the extracted hot water immediately becomes lower than the required hot water supply temperature of 50 ° C.

On the other hand, the temperature of the high-temperature water 15 is substantially constant at a temperature of 90 ° C. set for heating, and when hot water is taken out from the upper intake hole 40 and the intermediate intake hole 43, Since the high-temperature water 15 having a constant temperature is taken out at the same time, the temperature drop of the hot water becomes moderate and the time until the required hot water supply temperature is reached is lengthened.
Whether or not the extracted hot water falls below the required hot water temperature depends on the temperature and flow rate ratio of the high-temperature water 15 and the intermediate hot water 16 and the required hot water temperature, but the opening area of the upper water intake hole 40 and the intermediate water intake hole 43. By adjusting the ratio, the temperature of the hot water to be taken out can be made equal to or higher than the required hot water supply temperature.

  In this embodiment, the temperature of the hot water taken out from the water intake pipe 38 approaches the required hot water temperature while gradually decreasing, but when the temperature of the hot water is higher than the required hot water temperature, 50 ° C., the hot water temperature sensor 33. The low-temperature water mixing three-way valve 30 is actuated by the signal from, the hot water taken out from the intake pipe 38 is mixed with the low-temperature water supplied from the hot water supply pipe 31, and the hot water at the required hot water temperature is quickly supplied to the second water. It is supplied to hot water through the valve downstream pipe 32 and the hot water tap 4.

On the other hand, when it is determined that the hot water temperature sensor 34c disposed at the same height as the intermediate water intake hole 43, that is, the intermediate water intake hole 43 of the intake pipe 38 does not have the intermediate hot water 16 and low temperature water exists. The high-temperature water mixing three-way valve 28 is operated, and the high-temperature water 15 is taken out from the tapping pipe 7 instead of from the water intake pipe 38 . The high temperature water 15 is mixed with the low temperature water supplied from the hot water supply pipe 31 by the low temperature water mixing three-way valve 30 and supplied to the hot water through the second valve downstream pipe 32 and the hot water tap 4.
The hot water supply temperature is adjusted by adjusting the respective opening areas of the first valve portion and the third valve portion of the low-temperature water mixing three-way valve 30 based on a signal from the hot water supply temperature sensor 33.
When the hot water temperature sensor 34c determines that the high temperature water 15 exists at the position of the intermediate water intake hole 43 of the intake pipe 38, the high temperature water 15 can be taken out from the intake pipe 38 instead of from the hot water discharge pipe 7. .

Low-temperature water 17 is supplied into the hot water storage tank 2 from the lower side of the hot water storage tank 2 through the water supply pipe 8 by the amount of hot water taken out from the hot water storage tank 2.
Further, when the amount of the high temperature water 15 in the hot water storage tank 2 is reduced, the low temperature water 17 is extracted from the lower side of the hot water storage tank 2 through the low temperature water extraction pipe 9, and the high temperature water heated by the heat pump unit 3 is It returns from the upper side of the hot water storage tank 2 through the hot water return pipe 10 and the hot water inflow valve 6.
Here, carbon dioxide, which is a natural refrigerant, is used for the heat pump unit 3, and the low-temperature water can be heated to about 90 ° C. high-temperature water via a refrigerant-water heat exchanger provided in the heat pump refrigerant circuit. it can. By using supercritical carbon dioxide in the heat pump cycle, low temperature water can be heated to high temperature water with good energy efficiency.

As described above, by providing the intake pipe 38 having the upper intake hole 40 and the intermediate intake hole 43 in the hot water storage tank 2, the hot water tank 15 can be taken out of the hot water tank 2 by taking out the hot water 15 and the intermediate hot water 16. The temperature change with the passage of time of the hot water taken out from 2 can be reduced. As a result, temperature control by the low-temperature water mixing three-way valve 30 for adjusting to the required hot water supply temperature is facilitated.
Further, even when the temperature of the intermediate hot water 16 is lower than the required hot water supply temperature, the intermediate hot water 16 is taken out simultaneously with the high temperature water 15 and supplied to the hot water supply water. Therefore, the proportion of the hot water 16 in the sealed hot water storage tank is increased, so that the proportion of the hot water is not lowered correspondingly, the shortage of the hot water 15 in the hot water storage tank 2 is solved, and the heat pump The unit 3 is secured with a high COP.

In this embodiment, it has been explained that the hot water taken out from the hot water storage tank 2 using the intake pipe 38 is set to the required set temperature or higher, but the intake pipe 38 and the outlet pipe 7 are operated by the operation of the high-temperature water mixing three-way valve 28. The hot water extracted from the intake pipe 38 and the high temperature water extracted from the outlet pipe 7 are mixed by the high temperature water mixing three-way valve 28, whereby hot water having a required temperature or higher can be obtained.
In this case, even if the temperature of the hot water taken out from the water intake pipe 38 is equal to or lower than the required hot water supply temperature, the required hot water temperature is increased by increasing the amount of hot water 15 from the hot water piping 7 by the operation of the high temperature water mixing three-way valve 28. The temperature can be increased to the above.
Therefore, most of the medium temperature water 16 in the hot water storage tank 2 can be taken out and used for hot water supply, the shortage of the high temperature water 15 in the hot water storage tank 2 is further eliminated, and the heat pump unit 3 can further secure a high COP. .

In addition, it has been described that the flow rate ratio between hot water taken out of the hot water storage tank 2 and high temperature water or low temperature water is adjusted using three-way valves such as the high-temperature water mixing three-way valve 28 and the low-temperature water mixing three-way valve 30. Instead of the valves, the flow rate ratio may be adjusted using two valves.
Further, in this embodiment, the case where the opening area of the upper intake hole 40 is larger than the opening area of the intermediate intake hole 43 has been described, but the opening areas of the upper intake hole 40 and the intermediate intake hole 43 may be equal. Furthermore, as shown in FIG. 4, the opening area of the intermediate intake hole 43 may be larger than the opening area of the upper intake hole 40.
In this case, the temperature of the hot water taken out from the water intake pipe 38 is likely to be lower than the required hot water supply temperature. This makes it easier to control the temperature of hot water.
Further, as shown in FIGS. 5 and 6, by changing the number of the upper intake holes 40 and the number of the intermediate intake holes 43, the flow rate ratio of the high temperature water 15 and the intermediate temperature water 16 taken out from the intake pipe 38 is adjusted. Also good. In addition, as shown in FIG. 7, the middle temperature water 16 may be taken out with the lower end surface of the intermediate intake hole 40 without closing the lower end portion of the intake pipe 38. In this case, it is not necessary to close the lower end portion of the water intake pipe and the hole processing of the intermediate water intake hole 43, and the processing cost can be reduced.
Furthermore, as shown in FIG. 24, the opening area of the intermediate water intake hole 43 can be easily adjusted by closing the lower end portion.

Moreover, as shown in FIG. 1, although the case where the five hot water temperature sensors 34a, 34b, 34c, 34d, 34e were provided in the surrounding side surface of the hot water storage tank 2 was shown, more hot water temperature sensors 34 are provided. Thus, the position and temperature of the intermediate warm water 16 can be detected with high accuracy. For example, it is effective to install the hot water temperature sensor 34 in the height direction at intervals of 100 mm or less, centering on the center position of the intermediate water intake hole 43 in accordance with a typical intermediate warm water layer thickness of about 100 mm.
The hot water temperature sensors 34a, 34b, 34c, 34d, and 34e may be arranged at regular intervals in the height direction or randomly arranged in the height direction.
Furthermore, here, the position of the intermediate warm water 16 is determined using the measurement points of the three hot water temperature sensors 34b, 34c, 34d, but the position of the intermediate warm water 16 is determined more accurately by using more measurement points. be able to. In addition, although the measurement accuracy is lowered, the position of the medium temperature water may be determined using one temperature sensor. In this case, since control for comparing a large number of measurement points is not necessary, simplification of control and improvement of processing speed can be achieved.
The temperature of the wall surface of the hot water storage tank 2 measured by the hot water temperature sensor 34 installed on the outer peripheral surface (side surface) of the hot water storage tank 2 is defined as the temperature of the hot water in the hot water storage tank 2. You may install in an internal peripheral surface (side surface), and may measure the temperature of the hot water in the hot water storage tank 2 directly.

Further, as shown in FIGS. 8 and 9, an L-shaped intake pipe 38 may be used.
The intake pipe 38 has a tip projecting from the side wall of the hot water storage tank 2, and an upper water intake hole 40 at a position corresponding to the upper side in the hot water storage tank 2 and an intermediate water intake hole 43 at a position corresponding to the middle of the hot water storage tank 2. Is formed. By using this intake pipe 38, the intake pipe 38 can be taken out from the side wall of the hot water storage tank 2, so that the degree of freedom in design is increased.

Embodiment 2.
10 is a block diagram showing a hot water storage type hot water supply apparatus according to Embodiment 2 of the present invention. In this embodiment, as shown in FIGS. 11 and 12, an outer cylinder 25 and an inner cylinder 26 are stacked. A water intake pipe 38 which is a water pipe body is used.
The intake pipe 38 includes an outer cylinder 25 and an inner cylinder 26 that is provided inside the outer cylinder 25 so as to be slidable in the circumferential direction.
An upper communication hole 42 is formed in the upper part of the middle cylinder 26, and the upper part of the middle cylinder 81 is covered with the upper communication part 21. In the side surface of the upper communication portion 21, the leading end portion of the intake water distribution pipe 27 penetrates. A drive motor 35 is attached to the top of the middle cylinder 26, and the middle cylinder 81 rotates in the circumferential direction by the drive of the drive motor 35.
In this embodiment, the middle cylinder 26 is rotated by driving of the drive motor 35, and the upper hole portion 39 a and the intermediate hole portion 39 b formed in the outer tube 25, and the upper hole portion 41 a formed in the middle tube 26, The opening area of the upper intake hole 12a and the intermediate intake hole 12b of the intake pipe 38, which can be formed by the overlap of the intermediate hole part 41b, can be changed.

When the hot water sensors 34a, 34b, 34c, 34d, 34e determine that the medium temperature water 16 in the hot water storage tank 2 exists at the position of the intermediate water intake hole 12b, the hot water 15 is supplied from the upper water intake hole 12a to the intermediate water intake. The intermediate warm water 16 is taken from the hole 12 b and hot water is taken out from the hot water storage tank 2 through the upper communication hole 42 and the upper communication port 21 of the middle cylinder 26.
While detecting the temperature of hot water taken out from the hot water storage tank 2 with the hot water temperature sensor 29, the opening area of the upper water intake hole 12a and the intermediate water intake hole 12b is adjusted by the drive motor so that the temperature of the hot water does not become lower than the required hot water supply temperature. By changing, the flow rate ratio between the high-temperature water 15 taken out from the upper water intake hole 12a and the medium- temperature water 16 taken out from the intermediate water intake hole 12b is adjusted.
The extracted hot water reaches the low-temperature water mixing three-way valve 30 through the water intake distribution pipe 27 and the high-temperature water mixing three-way valve 28. In the low-temperature water mixing three-way valve 30, the hot water taken out and the low-temperature water supplied from the hot water supply pipe 8 are mixed, and the mixed hot water is supplied to the hot water through the second valve downstream pipe 32 and the hot water tap 4. Provided.
The required hot water supply temperature is adjusted by operating the low temperature water mixing three-way valve 30 according to the signal from the hot water temperature sensor 33 and changing the mixing ratio of hot water and low temperature water.

In this embodiment, the opening area of the upper water intake hole 12a and the intermediate water intake hole 12b is changed, and the flow rate ratio of the hot water 15 taken out from the hot water storage tank 2 and the medium hot water 16 is adjusted, so that Since the change can be made smaller, temperature control by the low-temperature water mixing three-way valve 30 for adjusting to the required hot water supply temperature can be further facilitated.
It is also possible to adjust the drive motor 25 to completely close the intermediate water intake hole 12b and take out the high temperature water 15 from only the upper water intake hole 12a.
For this reason, as shown in FIG. 13, the hot water supply pipe 7 for taking out the high temperature water 15 from the upper side of the hot water storage tank 2 and the high temperature water mixing three-way valve 28 can be removed to simplify the configuration.

Further, as in the intake pipe 38 shown in FIG. 14, the intermediate hole portion 39 b , the lower hole portion 39 c, and the intermediate tube 26 at different height positions of the outer cylinder 25 are arranged at intermediate positions in the hot water storage tank 2. Different intermediate hole portions 41b and lower hole portions 41c may be formed, and the drive motor 25 may be adjusted in accordance with the region of the intermediate temperature water 16 in the hot water storage tank 2 to change the height of the intermediate water intake hole 12b. .
In this case, since the intermediate warm water 16 can be selected and taken out from two positions of the hot water storage tank 2, the intermediate hot water 16 can be efficiently taken out from the hot water storage tank 2. Therefore, the volume of the hot water 15 occupying the hot water tank 2 can be increased by the amount by which the volume ratio of the hot water 16 occupying the hot water tank 2 can be reduced, and a high COP is secured in the heat pump unit 3.
In addition, although the example which provided the intermediate hole part in which the height position differs in two places was shown in the outer cylinder 25 and the middle cylinder 26, the number of intermediate hole parts may be three or more, and the number of intermediate hole parts As the amount of water increases, it becomes possible to take out the medium-temperature water more accurately.
In addition, it has been described that the opening area of the upper intake hole 12a and the intermediate intake hole 12b of the intake pipe 38 is changed by driving the drive motor 35. However, the upper intake hole 12a and the intermediate intake water are not adjusted finely. The hole 12b may be simply opened and closed, or the height position of the intermediate water intake hole 12b may be changed.
Further, it has been explained that the middle cylinder 26 is rotated by the drive motor 35 to move the middle cylinder 26 and the outer cylinder 25 relative to each other, thereby changing the opening areas of the upper intake hole 12a and the intermediate intake hole 12b of the intake pipe 38. However, the outer cylinder 25 may be rotated by the drive motor 35, and the middle cylinder 26 and the outer cylinder 25 may be moved relative to each other to change the opening areas of the upper intake hole 12a and the intermediate intake hole 12b of the intake pipe 38. .

Further, like the intake pipe 38 shown in FIG. 15, upper hole portions 39 a and 39 a ′ and intermediate hole portions 39 b and 39 b ′ having different opening areas may be formed at the same height of the outer cylinder 25.
In this case, the drive motor 25 is driven so that the upper intake hole 12a and the intermediate intake hole 12b can be selected to have different area ratios, and the high-temperature water 15 passing through the upper intake hole 12a and the intermediate intake hole It is possible to adjust the flow rate ratio with the intermediate warm water 16 passing through 12b. In this intake pipe 38, a predetermined area ratio of the upper intake hole 12 a and the lower intake hole 12 b is selected. However, the positioning control of the drive motor 35 is facilitated, and the flow rates of the hot water 15 and the intermediate hot water 16 are changed. The ratio can be changed.

In each of the intake pipes 38, the hole shapes of the hole portions 39a and 39b of the outer cylinder 25 and the hole portions 41a and 41b of the middle cylinder 26 are all circular, but the hole shapes are oval, triangular, It may be rectangular or polygonal, and the hot water flowing through the upper water intake hole 12a and the intermediate water intake hole 12b by changing the respective opening areas of the holes 39a and 39b of the outer cylinder 25 and the holes 41a and 41b of the intermediate cylinder 26. Any structure can be used as long as the flow rate can be changed.
For example, as shown in FIG. 16, the opening length in the height direction of the holes 41a and 41b of the outer cylinder 25 is simply increased or decreased in the rotational direction, and the holes 39a and 39b of the middle cylinder 26 are axially moved. Are formed in a long rectangular shape, the opening areas of the upper water intake hole 12a and the lower water intake hole 12b can be changed substantially in proportion to the rotation angle.
Thus, the flow rates of the high temperature water 15 and the medium temperature water 16 taken out of the hot water storage tank 2 by the intake pipe 38 are controlled with high accuracy.

Embodiment 3 FIG.
FIG. 17 is a block diagram showing a hot water storage type hot water supply apparatus according to Embodiment 3 of the present invention.
In this embodiment, as shown in FIGS. 17 to 19, the water intake pipe 38 extends to the bottom of the hot water storage tank 2 and is supported by a concave receiving portion 44.
The water intake pipe 38 may be supported outside the hot water storage tank 2 through the hot water storage tank 2.
A water intake hole formed by overlapping holes 39a, 39b, 39c formed in the outer cylinder 25 and holes 41a, 41b, 41c formed in the inner cylinder 26 by rotating the inner cylinder 26 with the drive motor 35. The opening area of 12a, 12b, 12c can be changed. Here, the hole 39a and the hole 41a are located on the upper side in the hot water storage tank 2, the hole 39b and the hole 41b are located in the middle of the hot water storage tank 2, and the hole 39c and the hole 41c. Is located below the hot water tank 2.

In this embodiment, when it is determined by the hot water temperature sensors 34a, 34b, 34c, 34d, 34e that the medium temperature water 16 in the hot water storage tank 2 is present at the position of the intermediate hole 39b, the hot water temperature sensor 34a, 34b, 34c, 34d, 34e Hot water 15, medium warm water 16 from the intermediate intake hole 12 b, low temperature water 17 from the lower intake hole 12 c, and hot water from the hot water storage tank 2 are taken out via the upper communication hole 42 and the upper communication port 21. The hot water temperature sensor 29 detects the temperature of the hot water taken out from the hot water storage tank 2 and drives the drive motor 35 to increase the opening area of the water intake holes 12a, 12b, 12c so that the temperature of the hot water does not become lower than the required hot water supply temperature. By changing, the flow rate ratio of the high temperature water 15 taken out from the upper intake hole 12a, the intermediate warm water 16 taken out from the intermediate intake hole 12b, and the low temperature water 17 taken out from the lower intake hole 12c is adjusted.
The extracted hot water reaches the low-temperature water mixing three-way valve 30 through the water intake distribution pipe 27 and the high-temperature water mixing three-way valve 28. In the low-temperature water mixing three-way valve 30, the hot water taken out and the low-temperature water supplied from the hot water supply pipe 8 are mixed, and the mixed hot water is supplied to the hot water through the second valve downstream pipe 32 and the hot water tap 4. Provided.
The required hot water supply temperature is adjusted by operating the low-temperature water mixing three-way valve 30 in response to a signal from the hot-water supply temperature sensor 33, and the hot water flowing through the first valve downstream pipe 5 and the low-temperature water flowing through the hot water supply water pipe 31. This is done by changing the mixing ratio.

According to the hot water storage type hot water supply apparatus according to this embodiment, the flow areas of the hot water 15, the intermediate hot water 16 and the low temperature water 17 taken out from the hot water storage tank 2 are adjusted by changing the opening areas of the intake holes 12 a, 12 b and 12 c. By doing so, the temporal change of the hot water temperature to be taken out can be brought closer to the required hot water temperature, and the temperature control by the low-temperature water mixing three-way valve 30 for adjusting the required hot water temperature can be further facilitated.
Further, by adjusting the drive motor 25, a combination of the high temperature water 15 and the medium temperature water 16, a combination of the high temperature water 15 and the low temperature water 17, a combination of the medium temperature water 16 and the low temperature water 17, the high temperature water 15, and the medium temperature water. 16 and all combinations of cold water 17 are possible.
Therefore, as shown in FIG. 20, the hot water storage pipe 2 for taking out the high temperature water 15 from the upper side of the hot water storage tank 2, the high temperature water mixing three-way valve 28, the hot water temperature sensor 29, and the low temperature water mixing three way valve 30 are removed. It can be simplified.

Further, a hole formed in the outer cylinder 25 by sliding the middle cylinder 26 up and down using a mechanism capable of sliding the middle cylinder 26 instead of the drive motor 25 as in the intake pipe 38 shown in FIG. You may change the opening area of the water intake holes 12a, 12b, 12c formed by overlap of 39a, 39b, 39c and the hole parts 41a, 41b, 41c formed in the middle cylinder 26.
Further, the opening area of the water intake holes 12a, 12b, and 12c may be changed by combining slide and rotation. In this case, the combination of the opening areas of the water intake holes 12a, 12b, and 12c is increased, and the flow rate is higher. Control and temperature control are possible.
Moreover, like the intake pipe 38 shown in FIG. 25, in the intermediate position in the hot water storage tank 2, the intermediate hole parts 39b and 39d from which the height position of the outer cylinder 25 differs, and the intermediate hole from which the height position of the middle cylinder 26 differs The portions 41b and 41d may be formed, and the height of the intermediate water intake hole 12b may be changed by adjusting the drive motor 25 in accordance with the region of the medium temperature water 16 in the hot water storage tank 2.
In this case, since the intermediate warm water 16 can be selected and taken out from two positions of the hot water storage tank 2, the intermediate hot water 16 can be efficiently taken out from the hot water storage tank 2. Therefore, the volume of the hot water 15 occupying the hot water tank 2 can be increased by the amount by which the volume ratio of the hot water 16 occupying the hot water tank 2 can be reduced, and a high COP is secured in the heat pump unit 3.
In addition, although the example which provided the intermediate hole part in which the height position differs in two places was shown in the outer cylinder 25 and the middle cylinder 26, the number of intermediate hole parts may be three or more, and the number of intermediate hole parts As the amount of water increases, it becomes possible to take out the medium-temperature water more accurately.
Further, it has been described that the opening area of the upper intake hole 12a, the intermediate intake hole 12b, and the lower intake hole 12c of the intake pipe 38 is changed by driving the drive motor 35, but the upper area is not adjusted finely. It is only necessary to open / close the water intake hole 12a, the intermediate water intake hole 12b, and the lower water intake hole 12c, or to change the height position of the intermediate water intake hole 12b.

Embodiment 4 FIG.
FIG. 22 is a configuration diagram showing a hot water storage type hot water supply apparatus according to Embodiment 4 of the present invention. In this embodiment, the water intake pipe shown in FIG. 23 is provided in the hot water storage tank 2.
This intake pipe body is composed of five cylinders 11a, 11b, 11c, 11d, and 11e that are arranged side by side and in which intake holes 12a, 12b, 12c, 12d, and 12e are respectively formed at different heights. Each of the cylinders 11a, 11b, 11c, 11d, and 11e having the communication holes 20a, 20b, 20c, 20d, and 20e on each upper end surface is connected to the outer cylinder portion 13 at the site of the communication holes 20a, 20b, 20c, 20d, and 20e. Has been. An inner cylinder part 14 is slidably provided inside the outer cylinder part 13. In the middle cylinder portion 14, communication holes 18a, 18b, 18c, 18d, and 18e are formed corresponding to the cylinders 11a, 11b, 11c, 11d, and 11e.

In this embodiment, instead of the intake pipe 38 shown in the first embodiment, the cylinders 11a, 11b, 11c, 11d, and 11e having different positions in the height direction of the intake holes 12a, 12b, 12c, 12d, and 12e are provided. It is provided so that the medium temperature water 16 in the hot water storage tank 2 can be selected.
In this embodiment, by driving the drive motor 22, the communication holes 20 a, 20 b, 20 c, 20 d, and 20 e formed in the outer cylinder part 13 and the communication holes 18 a, 18 b formed in the middle cylinder part 14, 18c, 18d, and 18e can be communicated at one place or a plurality of places.
For example, when it is determined by the hot water temperature sensor 34 that the medium temperature water 16 in the hot water storage tank 2 exists at the position of the water intake hole 12 c, the inner cylinder portion 14 is rotated by driving the drive motor 22, and the outer cylinder portion 13. The communication hole 20c and the communication hole 18c of the middle cylinder part 14, the communication hole 20a of the outer cylinder part 13 and the communication hole 18a of the middle cylinder part 14 are communicated, and the medium-temperature water 16 from the intake hole 12c is heated to the high temperature from the intake hole 12a. Each of the water 15 can be taken and taken out through the upper communication hole 19.
Accordingly, the position of the water intake hole can be changed in the height direction in accordance with the position of the intermediate warm water 16 existing in the hot water storage tank 2, and at the same time as the intermediate warm water 16 is taken out, the high temperature water 15 and the low temperature water 17 are removed. Can also be taken out.

Moreover, since the length of the outer cylinder part 13 and the middle cylinder part 14 that perform the rotation operation can be made shorter than arranging in the height direction of the hot water storage tank 2, friction during rotation can be reduced, The power consumption of the drive motor 22 can be reduced, and the positioning accuracy of the rotation angle can be improved.
In addition, although the example using five cylinders 11a, 11b, 11c, 11d, and 11e was shown, the number to install is arbitrary.
Further, although the middle cylinder part 14 is structured to rotate with respect to the outer cylinder part 13, the communication holes 20a, 20b, 20c, 20d, and 20e of the outer cylinder part 13 and the middle cylinder are formed by sliding the middle cylinder part 14. The structure may be such that the communication holes 18a, 18b, 18c, 18d, and 18e of the portion 14 are communicated.

In each of the above embodiments, the case where the heat pump unit 3 is used as the heating means has been described. However, the present invention is not limited to the heat pump unit 3, and a gas or an electric heater may be used.
Moreover, although the case where carbon dioxide was used as the refrigerant used in the heat pump unit 3 was described, of course, it is not limited to carbon dioxide, and other natural refrigerants such as hydrocarbons and chlorofluorocarbons may be used. .
Further, the intake pipe 38 may be made of a material having a low thermal conductivity such as a resin material instead of a material having a high thermal conductivity such as a metal. In this case, since the intake pipe 38 is used as a heat conductor, heat does not move between the hot water 45, intermediate hot water 46, and low temperature water 47 in the hot water storage tank 2. It is possible to prevent the shortage of hot water in the hot water storage tank 2. Moreover, the temperature rise of the low temperature water 47 can be prevented, and high COP is ensured.

It is a block diagram which shows the hot water storage type hot-water supply apparatus by Embodiment 1 of this invention. It is a perspective view which shows the intake pipe of FIG. In the hot water storage type hot water supply apparatus shown in FIG. 1, it is a figure which shows the time-dependent change of the hot water temperature when hot water is taken out from the intake pipe. It is a perspective view which shows the modification of the intake pipe of FIG. It is a perspective view which shows the other modification of the intake pipe of FIG. It is a perspective view which shows the other modification of the intake pipe of FIG. It is a perspective view which shows the other modification of the intake pipe of FIG. It is a block diagram which shows the modification of the hot water storage type hot-water supply apparatus of FIG. It is a perspective view which shows the intake pipe of FIG. It is a block diagram which shows the hot water storage type hot-water supply apparatus by Embodiment 2 of this invention. It is a perspective view which shows the intake pipe of FIG. It is principal part sectional drawing of FIG. It is a block diagram which shows the modification of the hot water storage type hot-water supply apparatus of FIG. It is a perspective view which shows the modification of the intake pipe of FIG. It is a perspective view which shows the other modification of the intake pipe of FIG. It is a perspective view which shows the other modification of the intake pipe of FIG. It is a block diagram which shows the hot water storage type hot water supply apparatus by Embodiment 3 of this invention. It is a perspective view which shows the intake pipe of FIG. It is principal part sectional drawing of FIG. It is a block diagram which shows the modification of the hot water storage type hot-water supply apparatus of FIG. It is a perspective view which shows the modification of the intake pipe of FIG. It is a block diagram which shows the hot water storage type hot water supply apparatus by Embodiment 4 of this invention. It is a perspective view which shows the water intake pipe body of FIG. It is a perspective view which shows the other modification of the intake pipe of FIG. It is a perspective view which shows the modification of the intake pipe of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit, 2 Hot water storage tank, 3 Heat pump unit (heating means), 4 Hot water tap, 5 1st valve downstream piping (valve downstream piping), 6 Hot water inflow valve, 7 Hot water piping, 8 Water supply pipe, 9 Low temperature Water extraction pipe, 10 high temperature water return pipe, 11a, 11b, 11c, 11d, 11e cylinder, 12a upper intake hole, 12b intermediate intake hole, 12c lower intake hole, 13 outer cylinder part, 14 intermediate cylinder part, 15 hot water , 16 Medium temperature water, 17 Low temperature water, 18a, 18b, 18c, 18d, 18e Communication hole, 21 Upper communication part, 23 Heating temperature sensor, 25 Outer cylinder, 26 Medium cylinder, 27 Water intake distribution pipe, 28 High temperature water mixing three-way valve , 29 hot water temperature sensor, 30 cold water mixing three-way valve, a water supply pipe 31 hot-water supply, 32 a second valve downstream pipe (valve downstream pipe), 33 hot water temperature sensor, 34a, 34b, 34c, 34d, 34 e Hot water temperature sensor, 35 drive motor, 37 water supply temperature sensor, 38 intake pipe (intake pipe body), 39a upper hole, 39b intermediate hole, 39c lower hole, 40 upper intake hole, 41a upper hole, 41b Intermediate hole part, 4 2 Upper communication intermediate water intake hole, 44 receiving part.

Claims (11)

A hot water storage tank for storing hot water,
Heating means for heating the hot water sent from the hot water storage tank;
A water intake pipe that extends vertically in the hot water storage tank and guides the hot water to the outside;
A hot water tap to which the hot water after being taken out of the hot water storage tank is guided,
The hot water storage type, wherein the intake pipe body is formed with at least an upper intake hole formed near the upper portion of the hot water storage tank and an intermediate intake hole formed below the upper intake hole. Hot water supply device. A hot water temperature sensor for detecting the temperature of the hot water sent to the hot water tap;
One end part is connected to the upper part of the hot water storage tank, and the hot water piping from which the high temperature water flows out,
One end is connected to the intake pipe body, and the intake water distribution pipe through which the hot water taken out to the outside of the hot water storage tank circulates,
The hot water flowing through the hot water supply pipe and hot water flowing through the intake water distribution pipe are mixed, and the temperature of the hot water sent to the hot water tap is adjusted from the temperature detected by the hot water supply temperature sensor. Item 2. A hot water storage type hot water supply apparatus according to item 1. One end of the hot water storage pipe connected to the lower part of the hot water storage tank is branched from a water supply pipe that sends the low temperature water to the lower part of the hot water storage tank, and includes a hot water supply water supply pipe through which the low temperature water flows.
Mixing hot water taken out of the hot water storage tank with low temperature water flowing through the hot water supply pipe, and adjusting the temperature of the hot water sent to the hot water tap from the temperature detected by the hot water temperature sensor; The hot water storage type hot water supply apparatus according to claim 1 or 2, characterized in that   The hot water storage type hot water supply apparatus according to any one of claims 1 to 3, wherein opening areas of the upper intake hole and the intermediate intake hole are different from each other.   5. The hot water storage type hot water supply apparatus according to claim 1, wherein the upper intake hole and the intermediate intake hole have different numbers of holes.   The intake pipe body is composed of an outer cylinder having an upper hole part and an intermediate hole part, and an intermediate cylinder having an upper hole part and an intermediate hole part provided to overlap the outer cylinder, and the upper intake hole. Is constituted by the upper hole portion of the outer cylinder and the upper hole portion of the middle cylinder, and the intermediate water intake hole is constituted by the intermediate hole portion of the outer cylinder and the intermediate hole portion of the middle cylinder. When at least one of the outer cylinder and the middle cylinder moves relative to at least one of the circumferential direction and the axial direction, the upper hole of the outer cylinder, the upper hole of the middle cylinder, the middle hole of the outer cylinder, and the middle The hot water storage system according to any one of claims 1 to 3, wherein an opening area of the upper water intake hole and the intermediate water intake hole is adjusted by changing a degree of overlap with the intermediate hole portion of the cylinder. Hot water supply device. The outer cylinder and the middle cylinder are each formed with a lower hole portion constituting a lower water intake hole formed at a position corresponding to the lower side of the hot water storage tank,
By the relative movement of the outer cylinder and the middle cylinder, the upper hole part of the outer cylinder and the upper hole part of the middle cylinder, the middle hole part of the outer cylinder and the middle hole part of the middle cylinder, and the lower hole part of the outer cylinder and the middle The hot water storage system according to claim 6, wherein opening areas of the upper water intake hole, the intermediate water intake hole, and the lower water intake hole are adjusted by changing a degree of overlap with a lower hole portion of the cylinder. Hot water supply device.   A plurality of intermediate hole portions are provided in the vertical direction of the outer cylinder and the middle cylinder, and the position of the intermediate water intake is changed in the vertical direction by relative movement of the outer cylinder and the middle cylinder. The hot water storage type hot water supply apparatus according to 6 or 7. The intake pipe body is composed of a plurality of tubes that are arranged side by side and each have intake holes formed at different heights.
The water intake hole of the water intake tube body is slidably provided on the inner side of the outer cylinder part that connects both ends of the cylinders, and has a communication hole formed corresponding to the cylinder. The hot water storage type hot water supply device according to any one of claims 1 to 3, wherein the hot water storage type hot water supply device is selected by movement of a portion.   The hot water storage type hot water supply apparatus according to any one of claims 1 to 9, wherein the intake pipe is made of a resin material.   The hot water storage type hot water supply apparatus according to any one of claims 1 to 10, wherein the heating means is a heat pump unit using carbon dioxide.

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