JP2004197969A - Storage water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage water heater capable of properly taking out a border layer between hot and cold water in a laterally long hot water storage tank. <P>SOLUTION: This heater is provided with a hot water storage tank 4 of a laterally long form to which a water inlet pipe 7 and a hot water outlet pipe 5 are connected to store hot water, and a heating means 2 to heat hot water in the hot water storage tank 4. Cold water is supplied from a lower part, and hot water is supplied from an upper part. One or a plurality of border layer takeout pipes 12 are provided at an upper part of the hot water storage tank 4. The border layer rising toward the upper part of the hot water storage tank as hot water is used is taken out by the border layer takeout pipe to be mixed with supply hot water at a mixing valve to be supplied. Continuous supply of low-temperature hot water is thus prevented to eliminate making a user feel out of order or unsecured. By using the border layer to be mixed with supply hot water to be supplied as hot water, low-temperature hot water can be effectively used, and consumption of high-temperature hot water can be reduced to improve output efficiency. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a hot water supply type hot water supply device such as a heat pump water heater or an electric water heater.
[0002]
[Prior art]
When the conventional hot water storage tank is used horizontally, the water supply port is covered with baffles so that the boundary layer between water and high-temperature water is not broken by the water supply from the water supply port at the bottom, and a gentle ascending slope is provided at the bottom. Formed. (For example, refer to Patent Document 1.)
[0003]
[Patent Document 1]
Japanese Patent No. 2579500
[Problems to be solved by the invention]
By the way, in this conventional device, since the hot water storage tank is placed horizontally, there is a large difference between the volume of the central portion and the volumes of the lower portion and the upper portion, and a thin boundary layer formed in the central portion is formed on the upper portion by using hot water. When it reached, a thick boundary layer was formed, and hot water supply with low-temperature hot water continued for a long time, giving the user a sense of discomfort and anxiety.
[0005]
[Means for Solving the Problems]
The present invention focuses on this point and solves the above-mentioned drawbacks. In particular, the configuration of the hot water storage tank is connected to a water inlet pipe and a hot water outlet, and has a horizontally long shape for storing hot water, and heating for heating the hot water in the hot water storage tank. Means for supplying water from the lower part and supplying water from the upper part, wherein one or a plurality of boundary layer extraction pipes are provided at the upper part of the hot water storage tank.
[0006]
As a result, the boundary layer that has risen to the upper part of the hot water storage tank due to the use of hot water is taken out by the boundary layer extraction pipe, mixed with hot water and supplied by the mixing valve, so that hot water supply with low-temperature hot water is prolonged. It can prevent the user from feeling uncomfortable or uneasy for a long time, and furthermore, mixing the boundary layer with hot water and using it for hot water enables effective use of hot water and high-temperature water. Can be reduced and the efficiency can be improved.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a hot water storage tank unit which is installed under the floor of a building in a horizontal position, 2 denotes a heating means including a heat pump unit, and 3 denotes a piping unit connecting the hot water storage tank unit 1 and the heating means 2.
[0008]
The hot water storage tank unit 1 is connected to a horizontally long hot water storage tank 4 for storing hot water, a hot water supply pipe 5 connected to an upper surface of the hot water storage tank 4 and a return pipe 6 from the heating means 2, and a lower part of the hot water storage tank 4. The water inlet pipe 7 and the outgoing pipe 8 leading to the heating means 2 are connected to each other, and a cylindrical water supply auxiliary pipe 9 communicating with the water inlet pipe 7 and supplying water extends in the longitudinal direction inside the hot water storage tank 4. And the end is closed.
[0009]
Further, the auxiliary water supply pipe 9 has a baffle plate 10 extending outward from the left and right side walls, and a pair of water supply holes 11 for discharging water obliquely downward to the auxiliary water supply pipe 9 below the baffle plate 10. Are provided in the longitudinal direction.
[0010]
Reference numeral 12 denotes a boundary layer outlet pipe provided at a portion where the boundary layer 13 becomes thicker in the upper part of the hot water storage tank 4, and is provided with an opening / closing valve 14 in the middle and connected to the hot water pipe 5 via a first mixing valve 15. With the detection of the boundary layer 13 by the temperature sensor 16 and the condition of using hot water, the boundary layer 13 is used for hot water supply and reduced.
[0011]
The heating means 2 includes a compressor 17 for compressing the refrigerant, a refrigerant-water heat exchanger 18 as a condenser, a decompressor 19, a heat pump circuit 21 including an air heat exchanger 20 as an evaporator, A blower 22 that blows air to the exchanger 20, a variable-capacity circulation pump 24 provided in the middle of a circulation circuit 23 including the return pipe 6 and the outgoing pipe 8, and a refrigerant-water heat exchanger 18 inlet side of the circulation circuit 23. A heat exchange inlet temperature sensor 25 for detecting the temperature of hot water flowing into the refrigerant-water heat exchanger 18; and a refrigerant-water heat exchanger provided on the refrigerant-water heat exchanger 18 outlet side of the circulation circuit 23. A heat exchange outlet temperature sensor 26 for detecting the temperature of hot and cold water flowing out of the heater 18 and a heating control unit 27 for controlling the heating means 2 are provided.
[0012]
The piping unit 3 is connected to a second mixing valve 29 for mixing high-temperature water from the tapping pipe 5 and low-temperature water from the branch pipe 28 branched from the inlet pipe 7, and is connected downstream of the second mixing valve 29. A hot water supply pipe 31 having a hot water tap 30, a hot water temperature sensor 32 provided on the hot water supply pipe 31, a hot water supply flow rate sensor 33 provided on the hot water supply pipe 31, and branched from the hot water supply pipe 31 and connected to a circulation circuit 35 of a bathtub 34. A hot water filling pipe 36, a heat retaining heater 37 for keeping the bathtub water warm in the circulation circuit 35 and a bath circulation pump 38, a pressure reducing valve 39 of the water inlet pipe 7 and a pressure relief valve 40 of the hot water pipe 5; A hot water supply control unit 41 for controlling the functional components is provided. By concentrating the piping and the functional components in the piping unit 3, the piping work at the time of installation and the maintenance work after the installation can be performed easily and efficiently. Those that way, is particularly effective in particular those installing the hot water storage tank unit 1 under the floor of the building block.
[0013]
Next, the operation of the embodiment of the present invention will be described.
First, when heating the hot water in the hot water storage tank 4, the heating control unit 27 operates the heat pump circuit 21 and starts driving the circulation pump 24 of the circulation circuit 23. Hot water taken out from the lower part of the hot water storage tank 4 by the drive of the circulation pump 24 flows into the refrigerant-water heat exchanger 18 of the heating means 2, is heated and returned to the upper part of the hot water storage tank 4 via the circulation circuit 23. As a result, hot water is stored.
[0014]
Here, the output of the heat pump circuit 21 and the capacity of the circulation pump 24 are appropriately adjusted according to the detection values of the heat exchange inlet temperature sensor 25 and the heat exchange outlet temperature sensor 26 so that the hot water to be heated has a predetermined high temperature. It is variable. More specifically, the respective outputs and capabilities are adjusted by feedforward control and / or feedback control in accordance with the detection values of the heat exchange inlet temperature sensor 25 and the heat exchange outlet temperature sensor 26.
[0015]
Then, when the hot water storage temperature sensor 16 provided on the side surface of the hot water storage tank 4 detects that a predetermined amount of high-temperature water has been stored, or when the heat exchange inlet temperature sensor 25 detects a predetermined temperature or more, the hot water supply control is performed. The unit 41 instructs the heating control unit 27 to stop the heating operation, and the operations of the heat pump circuit 21 and the circulation pump 24 are stopped.
[0016]
On the other hand, when the hot water tap 30 is opened, the hot water stored in the hot water storage tank 4 is pushed out of the hot water storage tank 4 by the pressure from the water inlet pipe 7 to the hot water outlet pipe 5, and is controlled by the hot water supply control unit 41. The low-temperature water in the branch pipe 28 and the temperature detected by the hot water supply temperature sensor 32 are mixed by the second mixing valve 29 so that the temperature detected by the hot water supply temperature sensor 32 becomes a predetermined temperature, and the hot water is supplied through the hot water supply pipe 31. The hot water of a predetermined temperature can be filled in the bathtub 34 via the. The predetermined temperature is arbitrarily set by an operation remote controller (not shown).
[0017]
Also, at this time, the supply water reduced by the use of hot water flows into the hot water storage tank 4 at the supply water pressure, so that the boundary layer 13 is pushed upward together with the high-temperature water, and the high-temperature water is supplied sequentially. Yes, the hot water supply further proceeds, and the hot water storage temperature sensor 16 detects a preset temperature, thereby determining that the boundary layer 13 has reached the position of the boundary layer extraction pipe 12. The opening / closing valve 14 is opened, the boundary layer 13 is taken out, mixed with the high-temperature water from the tapping pipe 5 by the first mixing valve 15, and then mixed with the low-temperature water and the set temperature by the second mixing valve 29. And used for hot water supply.
[0018]
Therefore, in the horizontal hot water storage tank 4, the boundary layer 13 becomes thicker at the upper part, but by using the boundary layer extraction pipe 12 appropriately for hot water supply and reducing it, hot water supply with low-temperature hot water may continue for a long time. There is no need to worry about giving the user a feeling of discomfort or anxiety, and the user can always use it with confidence.
[0019]
In this embodiment, the position of the boundary layer 13 is detected and taken out based on the temperature detected by the hot water storage temperature sensor 16, but the present invention is not limited to this. The position of the boundary layer 13 may be estimated and taken out when the usage amount reaches a predetermined usage amount, or may be performed at predetermined time intervals.
[0020]
【The invention's effect】
As described above, according to the present invention, the boundary layer that has risen to the upper portion of the hot water storage tank due to the use of hot water is taken out by the boundary layer extraction pipe, mixed with the hot water and supplied by the mixing valve, and the temperature is increased. It is possible to prevent the hot water supply with low temperature hot water from continuing for a long time, so that the user does not feel uncomfortable or uneasy.Furthermore, mixing the boundary layer with the hot water and using it for hot water supply makes the hot water effective. Utilization is performed, and a small amount of high-temperature water can be reduced, thereby improving efficiency.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a hot water supply type hot water supply apparatus to which one embodiment of the present invention is attached.
FIG. 2 is a sectional view of the hot water storage tank.
[Explanation of symbols]
2 heating means 4 hot water storage tank 5 tapping pipe 7 inlet pipe 12 boundary layer outlet pipe 13 boundary layer

Claims (6)

A hot water storage tank having a horizontally elongated hot water tank connected to a water inlet pipe and a hot water pipe for storing hot water, and a heating means for heating the hot water in the hot water storage tank; A hot-water storage type hot-water supply device characterized in that one or more boundary layer discharge pipes are provided at the upper part of the tank. The hot water supply apparatus according to claim 1, wherein the boundary layer outlet pipe is connected to a mixing valve, and is mixed with hot water and used for hot water supply. The hot-water storage type hot-water supply device according to claim 1, wherein the boundary layer is removed by the boundary-layer extraction pipe by detecting a temperature of hot water in a hot-water storage tank. The hot-water storage type hot water supply device according to claim 1, wherein the removal of the boundary layer by the boundary layer extraction pipe is performed by counting a usage amount of hot water stored in the hot water storage tank and reaching a predetermined usage amount. The hot water supply apparatus according to claim 1, wherein the boundary layer is taken out by the boundary layer take-out pipe at predetermined time intervals. The hot-water storage type hot water supply apparatus according to claim 1, wherein the removal of the boundary layer by the boundary layer extraction pipe is appropriately performed in accordance with the timing of using hot water.

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