JP5589664B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus that stores water heated by a heat pump type heating means in a hot water storage tank.

This type of hot water supply apparatus heats the water supplied from the bottom of the hot water tank to a high temperature by a heating means, and repeats a series of cycles to store it in the upper part of the hot water tank covered with a heat insulating material, thereby Or store hot water in a part. When the user uses hot water to supply hot water, the user mixes it with unheated water so as to obtain a predetermined temperature and use the hot water supply terminal.

  The operating efficiency of the heat pump 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, and when the outside air temperature is high or the boiling temperature is low, Operation efficiency is improved when the incoming water temperature is low. The outside air temperature varies depending on the season and operation time, and in addition, the incoming water temperature also varies depending on the temperature state of the hot water tank.

  In particular, when using a terminal that uses the heat in the hot water tank such as a bath chase or a radiator, the hot water in the heat using terminal and the hot water in the hot water tank are exchanged with a heat exchanger. It is configured to return to. Originally, there is water at the bottom of the hot water tank at a temperature that is about the same as the water supply temperature. However, when the use of a heat terminal occurs, the hot water from the heat exchanger is mixed with the low water at the bottom. Therefore, intermediate temperature water having an intermediate temperature higher than the feed water temperature is generated in the lower part of the hot water tank. Since the medium-temperature water is supplied to the heating means at the time of boiling, the temperature of the incoming water rises and the efficiency is significantly reduced.

  Conventionally, in order to remove the medium temperature water generated by the heat utilization terminal, a second hot water outlet is provided at an intermediate position in the vertical direction of the hot water tank, and the hot water existing at the intermediate position is preferentially used (for example, , See Patent Document 1).

  FIG. 9 shows a conventional hot water supply apparatus described in Patent Document 1. As shown in FIG. As shown in FIG. 9, a hot water tank 1, a heating means 2 for heating the hot water in the hot water tank 1, a first outlet pipe 3 connected to the upper part of the hot water tank 1, and an intermediate portion of the hot water tank 1 Second hot water pipe 4 connected, first mixing valve 6 for mixing hot water from first hot water pipe 3 of hot water tank 1 and hot water from second hot water pipe 4, and second hot water pipe 4 is provided with a hot water temperature detecting means 12 for detecting the hot water temperature in the hot water storage tank 1 at a position to which 4 is connected, and a hot water temperature setting means 30 for setting the hot water temperature, and the hot water temperature detected by the hot water temperature detecting means 12 is The first mixing valve is configured to discharge hot water from the second hot water discharge pipe 4 if it is equal to or higher than the hot water supply temperature set by the hot water supply temperature setting means 30, and to discharge hot water from the first hot water discharge pipe 3 if it is lower than the hot water supply set temperature. 6 channels are switched.

  Moreover, the heat utilization terminal 23, the heat exchanger 20 for exchanging the heat of the hot water storage tank 1 and the heat in the heat utilization terminal 23, the heat utilization hot water discharge pipe 21 connected to the upper part of the hot water storage tank 1, and the heat exchanger 20 And a heat utilization return pipe 22 connected to the lower part of the hot water tank 1, a pump 25 for conveying hot water from the hot water tank 1 to the heat exchanger 20, and heat utilization for detecting the heat utilization temperature at the heat utilization terminal 23. The temperature detection means 24 and the heat use temperature setting means 31 for setting the use temperature at the heat use terminal 23 are provided, and when the heat use by the heat use terminal 23 occurs, the temperature detected by the heat use temperature detection means 24 The flow rate is controlled by controlling the pump 25 according to the temperature set by the heat utilization temperature setting means 31. The intermediate warm water returning from the heat utilization return pipe 22 enters from the lower part of the hot water storage tank 1, rises according to the use of hot water, and is used after being discharged from the second hot water discharge pipe 4.

JP 2003-240342 A

However, when the temperature at the position of the second tapping pipe 4 is higher than the intermediate temperature (for example, 40 ° C. or more), convection occurs inside the second tapping pipe 4. That is, when the hot water in the second hot water discharge pipe 4 is cooled by the ambient air and the temperature is lowered, the specific gravity increases, so that it flows downward and moves into the hot water tank 1. At this time, the hot water in the hot water tank 1 moves upward in the second hot water discharge pipe 4 so as to be replaced. Due to this convection, the heat loss from the hot water storage tank 1 is increased, so that there is a problem that the efficiency is lowered.

  The present invention solves the above-described conventional problems, and provides a hot water supply device excellent in energy saving that can prevent an increase in heat dissipation loss due to convection inside a pipe for taking out hot water in a configuration using hot water in a hot water tank. For the purpose.

In order to solve the conventional problems, a hot water storage type hot water supply apparatus of the present invention includes a hot water storage tank, a heat pump device that heats water sent from a lower part of the hot water tank and returned to the upper part of the hot water tank, and the hot water storage tank. The first hot water pipe connected to the upper part of the hot water tank, the water supply pipe connected to the lower part of the hot water storage tank, and the position where the first hot water discharge pipe is connected in the vertical direction of the hot water storage tank and the water supply pipe are connected. A second hot water pipe connected between the position and the connected position between the hot water storage tank and the second hot water pipe, the other end of the first hot water pipe and the second hot water pipe A first mixing valve connected to the inlet side with the other end of the second tapping pipe, wherein the second tapping pipe extends in a horizontal direction from the connecting portion, and An upward piping section provided on the first mixing valve side of the horizontal piping section and extending upward. Of the second hot water pipe, in the horizontal pipe portion provided on the connecting portion side of the upward pipe section, hot water of the second tapping tube from flowing back in the direction of the hot water storage tank Convection prevention means is provided to prevent this, and the convection prevention means is bent downward in the horizontal piping portion of the second outlet pipe extending in the horizontal direction from the connecting portion, and then bent upward. By doing so, it is a U-shaped trap formed below the connecting portion .

  Thus, when hot water is used at the heat utilization terminal, the medium-temperature water generated by the hot water returning from the heat exchanger to the hot water storage tank can be effectively used through the second hot water discharge pipe. When hot water is not used at the heat terminal or hot water outlet, convection prevention means can prevent convection between the inside of the pipe where the hot water is taken out and the hot water storage tank. A decrease can be prevented.

  ADVANTAGE OF THE INVENTION According to this invention, in the structure using the hot water of a hot water tank, the hot water supply apparatus excellent in the energy saving property which can prevent the heat radiation loss increase by the convection inside the piping which takes out middle temperature water can be provided.

The block diagram of the hot water storage type hot water supply apparatus in Embodiment 1 of this invention Control block diagram when the same hot water supply occurs Flow chart of control when hot water is generated The figure which shows the change of the temperature distribution in the same hot water tank Control block diagram when heat is used at the same heat-using terminal Flow chart of control when heat utilization occurs at the same heat utilization terminal (A) The figure showing the temperature distribution before the heat utilization at the same heat utilization terminal (b) The figure showing the temperature distribution immediately after the heat utilization at the same heat utilization terminal (c) At the same heat utilization terminal Figure showing the temperature distribution after hot water is used and hot water is generated The block diagram of the hot water storage type hot water supply apparatus in Embodiment 2 of this invention Configuration diagram of conventional hot water supply equipment

The first invention is a hot water storage tank, a heat pump device for heating water returned from the lower part of the hot water tank and returning to the upper part of the hot water tank, a first hot water pipe connected to the upper part of the hot water tank, A water supply pipe connected to the lower part of the hot water tank, and a second pipe connected between a position where the first hot water discharge pipe is connected and a position where the water supply pipe is connected in the vertical direction of the hot water tank. A hot water discharge pipe, the hot water storage tank, and the second hot water discharge pipe are disposed above the connecting portion, and the other end of the first hot water discharge pipe and the other end of the second hot water discharge pipe are on the inlet side. A first mixing valve connected, the second hot water pipe extending in the horizontal direction from the connecting portion, and the first mixing valve side of the horizontal piping portion. the provided anda direction piping section on extending upward of said second tapping pipe, the upward pipe section The also the connecting portion and the horizontal pipe portion provided on the side, hot water of the second tapping tract convection preventing means for preventing the backflow provided in the direction of the hot water storage tank, said convection preventing means The U portion formed below the connection portion is formed by bending the horizontal piping portion of the second tapping pipe extending from the connection portion in the horizontal direction downward and then bending upward. A hot water storage type hot water supply device characterized by being a letter trap.

Thereby, since the increase in the heat dissipation loss due to the convection between the second hot water discharge pipe and the hot water storage tank can be prevented by the convection preventing means, there is an effect that the energy saving property is improved.

In addition, it is a hot water storage hot water supply device characterized by having a U-shaped trap as a convection prevention means, and by increasing the heat dissipation loss due to convection without adding other parts by making the shape of the pipe a U-shaped trap This has the effect of improving energy saving.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a hot water storage type hot water supply apparatus according to a first embodiment of the present invention.

  In FIG. 1, a hot water supply apparatus includes a hot water tank 1, a heat pump device that is a heating means 2 for heating water in the hot water tank 1, a first hot water pipe 3 connected to the upper part of the hot water tank 1, and a hot water tank. 1 is connected between the water supply pipe 5 connected to the lower part of 1 and the position where the first hot water discharge pipe 3 and the water supply pipe 5 are connected, that is, in the height direction to the substantially central part of the trunk of the hot water tank 1. A first hot water pipe 4, a feed water branch pipe 10 branched from the feed water pipe 5, a first mixing valve 6 in which the first hot water pipe 3 and the second hot water pipe 4 are connected to the inlet side; A second mixing valve 7 connected to the outlet side of the first mixing valve 6 and a feed water junction pipe 8 and a feed water branch pipe 10 connected to the inlet side, and an outlet side of the second mixing valve 7 And a mixed water pipe 9 connected to.

  Further, a check valve 4a as a convection preventing means is provided in the vicinity of the connecting portion between the second hot water pipe 4 and the hot water tank 1 and in the middle of the second hot water pipe 4, and the hot water tank from the second hot water pipe 4 is provided. The hot water is prevented from flowing back in the direction of 1. Further, the check valve 4a is arranged so that water does not flow unless the differential pressure across the check valve 4a exceeds a predetermined differential pressure even in the direction from the hot water storage tank 1 to the second outlet pipe 4. It is adjusted by an internal spring (not shown).

  Furthermore, a hot water supply port 11 connected to the mixed water pipe 9, a medium temperature detection means 12 for detecting the hot water temperature flowing through the second hot water discharge pipe 4, and a combined temperature detection means for detecting the hot water temperature flowing through the hot water discharge pipe merging pipe 8. 13, a hot water supply temperature detection means 14 for detecting the temperature of hot water flowing through the mixed water pipe 9, a heat utilization hot water discharge pipe 21 connected to the upper part of the hot water storage tank 1, and a heat exchanger 20 connected to the heat utilization hot water supply pipe 21 , A heat utilization return pipe 22 connected between the upper part of the hot water tank 1, a position where the hot water tank 1 and the second hot water discharge pipe 4 are connected, a heat utilization terminal 23 connected to the heat exchanger 20, A pump 25 for adjusting the amount of hot water flowing through the use return pipe 22 and a heat use temperature detecting means 24 for detecting the temperature of hot water flowing through the heat use terminal 23 are provided.

  Furthermore, the hot water supply temperature setting means 30 for setting the hot water supply temperature of the hot water supply port 11, the heat use temperature setting means 31 for setting the heat use temperature of the heat use terminal 23, the intermediate temperature detection means 12, the combined temperature detection means 13, and the hot water supply temperature. The first mixing valve 6 and the second mixing valve 7 are controlled based on the output of the detection means 14 and the setting of the hot water supply temperature setting means 30, and the outputs of the heat use temperature setting means 31 and the heat use temperature detection means 24, And a control device 33 having control means 32 for controlling the pump 25 based on the setting of the heat utilization temperature setting means 31.

FIG. 2 is a block diagram of the control, and the first mixing valve 6 and the first mixing valve 6 are connected to each other based on the output of the intermediate temperature detection means 12, the combined temperature detection means 13, and the hot water supply temperature detection means 14 and the setting of the hot water supply temperature setting means 30. It comprises control means 32 for controlling the two mixing valves 7.

  About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As a basic operation, the hot water tank 1 is filled with a lot of low-temperature water before boiling, and when the operation is started, the water in the hot water tank 1 is sent to the heat pump device 2 where it is heated and heated to hot water. Is returned to the hot water tank 1. As a result, hot water is stored in the hot water tank 1.

  When using hot water after boiling, the hot water in the hot water storage tank 1 discharged through the first hot water discharge pipe 3 and the second hot water discharge pipe 4 is mixed in the hot water discharge pipe joining pipe 8 mixed by the first mixing valve 6. The hot water and the water supplied from the water supply branch pipe 10 are mixed to the hot water supply set temperature by the second mixing valve 7 and supplied to the hot water supply port 11. Further, water corresponding to the amount of hot water used for hot water supply flows from the lower part of the hot water tank 1 through the water supply pipe 5.

  Here, the operation when using the hot water supply and the operation when using the heat utilization terminal will be described in detail with reference to FIGS. The hot water supply temperature is set as the hot water supply set temperature by the hot water supply temperature setting means 30, ts is the hot water supply set temperature of the hot water supply port 11, ts 2 is a temperature higher than the hot water supply set temperature, for example, + 5 ° C., and tm is the medium temperature detection means 12. The detected temperature. Further, te is a temperature detected by the heat use temperature detecting means 24, and ts3 is a temperature set by the heat use set temperature means.

  FIG. 3 is a flowchart of control when hot water is generated. When hot water supply is started, the magnitude relationship between tm and ts2 is determined (step 1), and when tm is higher than ts2, the first mixing valve 6 is set so that hot water is discharged only from the second hot water discharge pipe 4. Fully open to the second tapping pipe 4 side (step 2).

  When tm is equal to or less than ts, the opening degree of the first mixing valve 6 is adjusted based on the hot water temperature detected by the merging temperature detecting means 13 so that the merging temperature detecting means 13 becomes ts2 (step 3). . Thereafter, the second mixing valve 7 mixes the hot water in the hot water discharge pipe joining pipe 8 and the water in the hot water supply branch pipe 10 so that the output from the hot water supply temperature detection means 14 becomes ts (step 4). Hot water adjusted to the set temperature ts is supplied from the hot water supply port 11 through the mixed water pipe 9.

  FIG. 4 is a diagram showing changes in the temperature distribution in the hot water tank 1. The horizontal axis indicates the temperature, and the vertical axis indicates the height of the hot water tank 1. The temperature distribution of 45 indicates that the upper end of the intermediate temperature layer, which is an intermediate temperature zone, is at the position where the second hot water pipe 4 is connected to the hot water tank 1. In some cases, that is, just before the hot water supply in the middle temperature zone is started. While the hot water is discharged from both the first hot water discharge pipe 3 and the second hot water discharge pipe 4, the intermediate temperature layer moves upward of the hot water storage tank 1 while being reduced.

  When the hot water temperature at the hot water joining pipe 8 when the hot water is discharged from both becomes ts or less, the hot water from the second hot water pipe 4 is stopped, and the intermediate temperature layer is moved as it is above the hot water tank 1. As a result, the size of the intermediate temperature layer is initially 15 f but is reduced to 15 g. 46 is a temperature distribution at the time when the intermediate temperature layer 15g passes through the connection position of the second hot water discharge pipe 4.

  FIG. 5 shows a block diagram of control when heat is used at the heat use terminal 23, and the control of the pump 25 is based on the output of the heat use temperature detecting means 24 and the setting of the heat use temperature setting means 31. The control means 32 which performs is.

FIG. 6 is a flowchart of control when heat is used at the heat use terminal 23. When the use at the heat utilization terminal is started, the heat utilization temperature detecting means 24 detects the temperature te of the heat utilization terminal, and compares te with the heat utilization terminal set temperature ts3 (step 5). When te is lower than ts3, driving of the pump is started (step 6), and when it is higher, driving of the pump is stopped (step 7).

  FIG. 7 explains the temperature change caused by the hot water from the heat return pipe in the hot water tank 1 and the temperature change when hot water is generated. The horizontal axis indicates the temperature, and the vertical axis indicates the hot water tank 1 height. This shows the temperature distribution. T1 is the feed water temperature, T3 is the temperature of the upper part of the hot water storage tank 1, and T2 is the temperature of the medium temperature water generated by the inflow of hot water from the heat utilization return pipe 22.

  Reference numeral 61 in FIG. 7A denotes an initial temperature distribution. When hot water from the heat utilization return pipe 22 flows into the upper part of the hot water tank 1 from that state, the temperature distribution as indicated by 62 in FIG. It becomes. Although T2 changes with the temperature which flows in from the heat | fever utilization return pipe | tube 22, and T3, the hot water below the position where the heat | fever utilization return pipe | tube 22 of the hot water storage tank 1 is connected is always medium temperature water.

  Thereafter, when hot water is generated, the second hot water discharge pipe 4 is connected to a position below the heat-use return pipe, so that the medium-temperature water generated by the heat-use return pipe 22 is preferentially used, The influence of the temperature distribution change by the utilization return pipe 22 can be removed.

  In addition, since the heat return pipe 22 is connected to the upper part of the hot water tank 1 and the temperature of the lower part of the hot water tank 1 is maintained at the feed water temperature T1, the medium temperature water circulates in the heating device at the time of boiling and the efficiency is increased. It will never drop.

  When no hot water is used at the heat utilization terminal 23 or the hot water supply port 11, a check valve 4 a is provided in the vicinity of the connecting portion between the second hot water pipe 4 and the hot water tank 1 and in the middle of the second hot water pipe 4. Since it is provided, convection in which water whose temperature has decreased in the second hot water discharge pipe 4 flows into the hot water storage tank 1 does not occur, and an increase in heat dissipation loss can be prevented.

  When the second hot water discharge pipe 4 extends downward from the connecting portion between the second hot water discharge pipe 4 and the hot water storage tank 1, the water whose temperature has decreased is stored in the hot water storage tank 1 without the check valve 4 a. However, when the second hot water discharge pipe 4 extends upward, it is necessary to prevent the flow toward the hot water tank 1 by the check valve 4a.

  As described above, according to the first embodiment of the present invention, the reverse as the convection preventing means provided near the connecting portion between the second hot water discharge pipe 4 and the hot water storage tank 1 and in the middle of the second hot water discharge pipe 4. The stop valve 4a can prevent an increase in heat dissipation loss due to convection between the second hot water discharge pipe 4 and the hot water tank 1.

  Moreover, the structure which makes the connection position with the hot water storage tank 1 of the heat | fever utilization return pipe 22 higher than the connection position with the hot water storage tank 1 of the 2nd hot water discharge pipe 4 WHEREIN: Since the influence can be removed and the efficiency drop at the time of boiling can be prevented, good usability and high energy saving can be realized.

(Embodiment 2)
FIG. 8 is a diagram showing a configuration of a hot water storage type hot water supply apparatus according to Embodiment 2 of the present invention. The difference between the second embodiment of the present invention and the first embodiment is that, as a convection prevention means provided in the vicinity of the connecting portion between the second tapping pipe 4 and the hot water storage tank 1 and in the middle of the second tapping pipe 4, Instead of the stop valve 4a, a U-shaped trap 4b is provided.

  When hot water is not used at the heat utilization terminal 23 or the hot water supply port 11, even if the hot water temperature in the second tapping pipe 4 decreases, the low-temperature water accumulated in the U-shaped trap 4 b becomes a resistance. Thus, convection flowing into the hot water tank 1 can be prevented.

  Thus, according to Embodiment 2 of the present invention, a U-shape as a convection prevention means provided near the connecting portion between the second hot water pipe 4 and the hot water tank 1 and in the middle of the second hot water pipe 4. The trap 4b can prevent an increase in heat dissipation loss due to convection between the second tapping pipe 4 and the hot water tank 1 while preventing an increase in heat dissipation loss due to convection without adding other components.

  In addition, the configuration in which the connection position of the heat utilization return pipe 22 with the hot water storage tank 1 is set higher than the connection position of the second hot water discharge pipe 4 with the hot water storage tank 1 is affected by the medium temperature water generated by the heat utilization return pipe 22. Since it is possible to prevent the decrease in efficiency during boiling, good usability and high energy saving can be realized.

  As described above, since the hot water supply apparatus according to the present invention reduces the decrease in efficiency due to the use of the heat utilization terminal when using the heat of the hot water in the hot water storage tank, it can be applied to the domestic hot water supply apparatus as described above. In addition, the system having a heat source and a hot water storage tank can be applied to large-scale applications such as for business use and can provide excellent energy saving.

1 Hot water tank 2 Heating means (heat pump device)
3 First tapping pipe 4 Second tapping pipe 4a Check valve (convection prevention means)
4b U-shaped trap (convection prevention means)
DESCRIPTION OF SYMBOLS 5 Water supply pipe 6 1st mixing valve 7 2nd mixing valve 8 Outlet pipe merge pipe 9 Mixed water pipe 10 Feed water branch pipe 11 Hot water inlet 12 Medium temperature detection means 13 Merged temperature detection means 14 Hot water supply temperature detection means 16 Boiling pipe 20 Heat Exchanger 21 Heat utilization outlet pipe 22 Heat utilization return pipe 23 Heat utilization terminal 24 Heat utilization temperature detection means 25 Pump 30 Hot water supply temperature setting means 31 Heat utilization temperature setting means 32 Control means 33 Controller

Claims (1)

A hot water tank,
A heat pump device that heats water sent from the lower part of the hot water tank and returning to the upper part of the hot water tank;
A first hot water pipe connected to the upper part of the hot water storage tank;
A water supply pipe connected to the lower part of the hot water tank;
A second hot water pipe connected between a position where the first hot water pipe is connected and a position where the water supply pipe is connected in the vertical direction of the hot water storage tank;
A first connecting portion between the hot water storage tank and the second outlet pipe is disposed above the other end of the first outlet pipe and the other outlet of the second outlet pipe is connected to the inlet side. 1 mixing valve,
The second hot water discharge pipe includes a horizontal pipe part extending in a horizontal direction from the connection part, and an upper pipe part provided on the first mixing valve side with respect to the horizontal pipe part and extending upward. has, among the second tapping pipe, the said horizontal pipe portion provided in the connecting portion than the direction the pipe section, hot water of the second tapping tract of the hot water storage tank Convection prevention means to prevent backflow in the direction is provided,
The convection prevention means is configured such that the horizontal piping portion of the second tapping pipe extending in the horizontal direction from the connection portion bends downward, and then bends upward, thereby lowering the connection portion. A hot water storage type hot water supply apparatus, characterized in that it is a formed U-shaped trap.

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