JP2007232231A - Water supply device for open-type hot water storage tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water supply device for an open-type hot water storage tank, which continuously supplies hot water stable in its temperature even when the use of supplied hot water is significantly changed. <P>SOLUTION: A distribution pipe 11 disposed along a bottom surface of the hot water storage tank 1 is connected with a water supply pipe 2 for supplying water when a water level in the hot water storage tank 1 is changed, through a water supply connection pipe 10, and the water is supplied to the hot water storage tank 1 through a number of discharge pores 11a formed on the distribution pipe 11. A hot water return pipe 5 for temperature rise to a boiler 17 heating the water in the hot water storage tank 1 is connected with an end portion of the distribution pipe 11, and the water in the hot water storage tank 1 is sucked from the discharge pores 11a and supplied to the boiler 17. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a hot water storage tank that is installed in a high-rise building or the like and stores hot water for supplying hot water particularly to each room in a low-rise section, etc., and is an open type for supplying water to an open type hot water storage tank that supplies hot water by a natural head The present invention relates to a hot water tank water supply device.

  As a device for supplying hot water to a high-rise building, particularly to a low-rise building, an open-type hot water storage tank using a natural head may be used. This open-type hot water storage tank is piped by a boiler and a circulation path so that the water in the tank is kept at a constant temperature, and when the temperature of the water in the tank drops, it passes through the circulation path. Water is supplied to the boiler, heated by the boiler, and returned to the tank. FIG. 7 is a schematic diagram for explaining a water path of a conventional hot water tank 1, and water is supplied to the hot water tank 1 from a water supply pipe 2. In addition, hot water at a constant temperature is supplied to each chamber through a hot water supply pipe 3. When supplied to each chamber, hot water that is not used is returned from the hot water supply return pipe 4 to the hot water tank 1 by a pump (not shown). The hot water storage tank 1 is provided with a temperature control device (not shown), and when the stored water falls below a certain temperature, it is supplied from the hot water return pipe 5 to a boiler (not shown). The heated water is returned to the hot water tank 1 through the temperature return pipe 6.

  The water supply from the water supply pipe 2 is supplied when the water level in the hot water tank 1 is lowered, and this control is performed by a float 2a and a valve 2b that opens and closes in response to the float 2a. That is, when the amount of hot water used in the hot water supply chamber increases, the water level in the hot water storage tank 1 drops, so that the float 2a also follows and the valve 2b is opened to supply water. When the water level rises, the float 2a also rises to close the valve 2b, and the water supply is stopped. Water supply from the water supply pipe 2 is performed by a water supply guide pipe 7 located in the hot water tank 1.

  On the other hand, as a hot water storage tank temperature raising system capable of generating uniformly heated hot water supply in a short time, it has a side plate and a bottom plate, and a predetermined hot water supply pipe for supplying hot water to a consumption place is connected to the predetermined side plate. A tank body, and in the tank body, disposed on the other side plate facing the predetermined side plate and supplying water from the water supply pipe into the tank body from the bottom plate side, A hot water return means that is disposed closer to the predetermined side plate than the water supply means and supplies the hot water from the hot water return pipe into the tank body from the bottom plate side, and is disposed between the water supply means and the hot water return means. And suction means for sucking down the returned hot water on the bottom plate side and feeding it to the circulation pipe, and the heated hot water fed from the circulation pipe and heated by the heating means from the bottom plate side to the tank body from the bottom plate side. It is arranged closer to the predetermined side plate than the hot water return means so Blown out means and, one provided an ejector having a horizontal portion open toward the portion with the predetermined side plate surrounding the 該吹 out means Aaru (Patent Document 1). Moreover, regardless of the cross-sectional shape, the hot water storage tank that can reliably guide the cold water supplied from the water supply port to the bottom of the hot water storage tank, form a temperature stratification, and take out hot water from the hot water supply port In a hot water storage tank provided with a water supply port for supplying water into the hot water storage tank and a hot water supply port for supplying hot water in the hot water storage tank to the outside, water supplied from the water supply port to the water supply port is stored in the hot water storage tank. There is a water guide pipe that leads to the bottom of the tank, and a water flow path from the back side to the front side of the hot water tank at the bottom of the hot water tank that faces the water guide pipe (Patent Document 2).

JP 2004-184024 A 5-79355

FIG. 6 is a diagram showing a change in the temperature of the hot water storage tank 1 and the hot water supply temperature for 24 hours when hot water is supplied to each guest room of the high-rise hotel in which the hot water storage tank 1 shown in FIG. 7 is installed. Two hot water tanks 1 each having an internal capacity of 12.5 m ³ are installed. The figure shows each hot water tank 1, ○ is the temperature in the first hot water tank 1, and ● is the second The inside temperature of the hot water tank 1, Δ is the hot water temperature supplied to each room by the first hot water tank 1, and ▲ is the hot water temperature supplied to each room by the second hot water tank 1. As shown in the figure, the temperature inside the tank and the hot water supply temperature decreased at a certain time in the night, and there was a situation where hot water supply with sufficient temperature could not be obtained. This is probably because hot water and cold water are mixed in the hot water storage tank 1 due to the fact that showers and the like are used almost simultaneously in many guest rooms, so that the temperature in the tank decreases and the hot water supply temperature decreases.

  As shown in FIG. 7, the hot water storage tank 1 has the outlet of the water supply guide pipe 7 positioned in the tank so that water is supplied to the bottom of the hot water tank 1, while the hot water pipe 3 is connected to the hot water tank 1. It is connected to the upper part of the hot water tank 1 so that water is taken from the upper layer of the hot water tank 1. That is, the high temperature water stays in the upper layer of the hot water tank 1 and the low temperature water stays in the lower layer, so that temperature stratification is generated and the upper layer high temperature water can be taken. However, when hot water is concentrated and used, the water level continuously decreases in the hot water tank 1, so that cold water is continuously supplied from the water supply pipe 2. A flow is generated in the hot water storage tank 1 by the water supplied from the water supply pipe 2, and the hot water storage tank 1 is agitated by this flow, so that the temperature stratification in the tank is not formed, and the internal temperature of the tank decreases substantially constant. The lowered temperature is discharged from the hot water supply pipe 3.

  Therefore, the present invention prevents the inside of the hot water tank from being stirred by the water supply as much as possible, can reliably generate temperature stratification in the hot water tank, can maintain this temperature stratification even by the water supply, and is sufficiently hot. It aims at providing the water supply apparatus of the open-type hot water storage tank which enabled supply of hot water.

  As technical means for achieving the above object, a water supply device for an open-type hot water storage tank according to the present invention has a circulation path with heating means, and is supplied with water in accordance with fluctuations in the water level and uses a natural head. In an open-type hot water storage tank for supplying hot water staying in the upper layer to a consumption place, the dispersion pipe is connected to the water supply pipe for the water supply and is disposed along the bottom surface of the hot water storage tank. In addition, an appropriate number of discharge small holes are formed in which the discharge direction is a direction other than the direction above the hot water tank.

  When the water level in the hot water storage tank is lowered, water is supplied through the water supply pipe, and this water supply flows into the hot water storage tank from the discharge small holes formed in the dispersion pipe. The discharge small holes flow toward the bottom surface of the hot water tank, and the total opening area of the discharge small holes is larger than the cross-sectional area of the dispersion pipe, so the discharge flow rate from each small hole is small. Thus, it flows out in a state of staying at the bottom of the hot water tank. For this reason, the inside of a hot water tank is not stirred, but temperature stratification is formed.

  A water supply device for an open hot water storage tank according to the invention of claim 2 is characterized in that a return hot water return pipe to the heating means is connected to one end of the dispersion pipe.

  The returning hot water for heating to the heating means is performed by being sucked into the dispersion pipe through the small discharge holes. Therefore, water with a lower temperature in the lower layer is supplied to the boiler, so that it can be heated efficiently and the temperature in the hot water tank can be easily kept constant.

  According to the water supply device for an open-type hot water storage tank according to the present invention, the water supply into the hot water storage tank is performed so as to gradually spread to the bottom of the hot water storage tank at a small flow rate, so that the inside of the hot water storage tank is not stirred. The temperature stratification can be reliably generated, and the temperature stratification is not destroyed. For this reason, the high temperature water of an upper layer can always be stably supplied to a consumption place.

  Further, according to the water supply device of the open type hot water storage tank according to the invention of claim 2, since the hot water for heating is sucked from the discharge small holes formed in the dispersion pipe and supplied to the heating means, from a wide range Water is taken in and low-temperature water can be efficiently fed to the heating means. Further, when the water level is lowered and water is supplied from the water supply pipe, a part of the water supply is sucked into the heating water return pipe and fed to the heating means. Therefore, even when the coldest water is supplied directly to the heating means, the influence on the temperature in the hot water tank is reduced and the amount of hot water supply is increased, the temperature gradient in the hot water tank is increased. Is kept almost constant and does not lower the hot water supply temperature.

  FIG. 3 is a schematic diagram for explaining the path of water in the water supply device of the open-type hot water storage tank according to the present invention, which corresponds to the schematic diagram for explaining the conventional water path shown in FIG. Are given the same reference numerals. 1 and 2 show actual piping, FIG. 1 is a front view, and FIG. 2 is a plan view, and the hot water tank 1 is indicated by an imaginary line. A water supply connection pipe 10 extending to the bottom of the hot water tank 1 is connected to the water supply pipe 2, and a dispersion pipe 11 is connected to the water supply connection pipe 10. The dispersion pipe 11 is arranged along the bottom surface of the hot water tank 1, and the wall surface facing the wall surface along the water supply connection pipe 10 is extended to a position where the tip of the dispersion pipe 11 faces. A water supply rising pipe 12 is connected to the tip of the dispersion pipe 11 along the wall surface, and the tip of the water supply rising pipe 12 protrudes from the steady position of the water level L of the hot water tank 1. A stop valve 13 is attached to the part. As shown in FIGS. 1 and 2, it is preferable that the horizontal pipe 12 a is further extended from the upper end of the water supply rising pipe 12 so that the tip thereof is located at a position far from the connecting portion of the hot water supply pipe 3.

  A water intake pipe 14 connected to the heating water return pipe 5 is connected to the end of the dispersion pipe 11 on the connection side with the water supply connection pipe 10. Note that the intake pipe 14 may be connected to the end portion on the connection portion side with the water supply riser pipe 12.

  As shown in FIG. 1, a large number of small discharge holes 11 a are formed in the lower half of the dispersion pipe 11 so as to face the bottom surface of the hot water tank 1. These small discharge holes 11a may be provided at a position facing the side wall in addition to the bottom surface as long as the small discharge hole 11a does not face the upper side. Further, the diameter and number of the small discharge holes 11a are set so that the flow rate of the water supplied from the small discharge holes 11a is 0.1 m / s or less. In this embodiment, the dispersion pipe 11 is made of a heat-resistant hard polyvinyl chloride pipe (HTVP) with a nominal diameter of 150A and a length of about 1500mm, and more than 340 discharge small holes 11a with a diameter of about 10mm in the lower half. Formed.

  FIG. 4 is a schematic view showing a piping system of a hot water tank 1 equipped with this water supply device, and includes two hot water tanks 1. These hot water tanks 1 are supplied with water from a water supply pipe 2. A hot water supply pipe 3 is connected to the upper wall of the hot water tank 1 and lower than the normal water level L, and a hot water supply pipe (not shown) to a consumption place such as each room is connected. The suction side of the hot water supply pump 15 is connected downstream of the hot water supply pipe 3 passing through the connecting portions to the respective chambers, and the hot water supply return pipe 4 is connected to the discharge side of the hot water supply pump 15. The temperature raising hot water return pipe 5 is connected to the suction side of the boiler return pump 16, and the discharge side of the boiler return pump 16 is connected to the inlet side of the boiler 17 as heating means. The temperature rising return pipe 6 is connected to the outlet side of the boiler 17, and this temperature rising return pipe 6 is connected to the upper side of the hot water tank 1, and the hot water heated by the boiler 17 is the upper layer of the hot water tank 1. It is designed to be supplied to the high temperature range. Reference numeral 18 denotes various valves provided in the middle of the pipe, which are provided at necessary places for repairing the pipe, draining, and adjusting the flow rate.

  The operation of the water supply device for an open hot water tank according to the embodiment of the present invention configured as described above will be described below.

  Hot water supply from the hot water tank 1 to each room is performed via a hot water supply pipe 3 connected to the hot water supply equipment of each room. Since this hot water supply pipe 3 is connected slightly below the water surface L of the hot water tank 1, high temperature water in the upper temperature region of the temperature stratification generated in the hot water tank 1 is supplied to each chamber. The Hot water discharged from the hot water supply pipe 3 and not used is returned to the hot water storage tank 1 through the hot water supply return pipe 4 by the operation of the hot water supply pump 15. At this time, the hot water supply return pipe 4 is connected to the bottom of the hot water tank 1, and the water whose temperature is lowered without being used is returned to the low temperature region of the hot water tank 1.

  When hot water is used in each room, the water level L in the hot water tank 1 is lowered by supplying high temperature water from the hot water tank 1 and consuming it. Since the float 2a descends following the lowering of the water level L, the valve 2b is opened and water is supplied to the hot water tank 1. This water supply reaches the dispersion pipe 11 from the water supply pipe 2 through the water supply guide pipe 7, and is performed from a discharge small hole 11 a formed in the dispersion pipe 11. For this reason, water is supplied from the entire area of the dispersion pipe 11 in the longitudinal direction and is discharged from the small holes, so that the flow velocity is small and spreads to the lower layer of the hot water tank 1 over time. Therefore, a temperature stratification in which high temperature water stays in the upper layer and low temperature water stays in the lower layer due to the temperature difference, and the inside of the hot water tank 1 is agitated because the flow rate of the water supplied from the discharge small hole 11a is small. And temperature stratification is not destroyed. Even when the amount of water used in each room increases and the amount of water supply increases, the water supply into the hot water tank 1 is carried out through a small hole, so the flow rate is small, and the temperature inside the hot water tank 1 is not stirred. The stratification is not destroyed.

  When there is no use of hot water in the guest room, since the water level in the hot water tank 1 is at the steady water level L, no hot water is supplied to the hot water tank 1, and the low temperature water in the lower temperature region is heated by the heating means. Is done. That is, the low-temperature water sucked from the heating return pipe 5 by the boiler return pump 16 is heated through the boiler 17 and then supplied to the upper layer in the hot water tank 1 by the temperature return pipe 6. The For this reason, the generated temperature stratification is maintained inside the hot water tank 1. Further, the hot water storage tank 1 is sucked from a discharge small hole 11 a formed in the dispersion pipe 11. For this reason, the low temperature water in the vicinity of the bottom surface of the hot water tank 1 is sucked from a wide range, and the water temperature can be averaged efficiently.

As shown in FIG. 5, which shows a change in the temperature of the hot water tank 1 and the time of the hot water temperature of the hot water tank 1 when hot water is supplied to each guest room of the high-rise hotel by the water supply device of the open type hot water tank according to this embodiment. Yes, this figure corresponds to FIG. There are two hot water tanks 1 each having an internal capacity of 12.5 m ³ , FIG. 5 shows the respective hot water tanks 1, ○ is the temperature in the first hot water tank 1, and ● is the second The inside temperature of the hot water tank 1, Δ is the hot water temperature supplied to each room by the first hot water tank 1, and ▲ is the hot water temperature supplied to each room by the second hot water tank 1. As shown in FIG. 5, both the temperature in the first hot water tank and the temperature of the second hot water tank and the hot water temperature can be kept almost stable throughout the day, and hot water can be supplied at a stable temperature. .

  According to the water supply apparatus according to the present invention, hot water supply at a stable temperature can be performed even in an open type hot water storage tank, and therefore an open type hot water storage tank can be used for low-rise parts such as high-rise buildings. Since the open-type hot water storage tank supplies hot water by natural water head, energy saving can be achieved. Therefore, it is possible to contribute to energy saving by using a closed hot water tank for the upper layer part and an open hot water tank for the lower layer part. Moreover, since it is an open type, the pressure resistance of the hot water tank itself is not required compared to the sealed type, and the manufacturing cost of the hot water tank can be suppressed, and there is a great demand for higher-rise residences, office buildings, hotels, etc. It will be a thing.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows schematic structure at the time of mounting the water supply apparatus which concerns on this invention in an open type hot water storage tank, and the hot water storage tank is shown by the imaginary line. It is a top view which shows schematic structure of the hot water supply apparatus shown in FIG. 1, and has shown the hot water storage tank with the imaginary line. It is a figure explaining piping around the hot water storage tank of the water heater of the open type hot water storage tank concerning this invention. It is a systematic diagram in the case of supplying hot water using the water supply device of the open type hot water storage tank according to the present invention. It is a figure showing the change in the tank internal temperature of a hot water storage tank of a day, and hot water supply temperature at the time of supplying hot water to the low-rise part of a high-rise hotel with the water supply apparatus of the open-type hot water storage tank concerning this invention. It is a figure showing the change of the tank internal temperature of a hot water storage tank of a day when the hot water supply to the low-rise part of a high-rise hotel is carried out with the water supply apparatus of the conventional open type hot water storage tank, and hot water supply temperature, and is equivalent to FIG. It is a figure explaining piping around the hot water storage tank of the water supply apparatus of the conventional open type hot water storage tank, and is equivalent to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water tank 2 Water supply pipe 3 Hot water supply pipe 4 Hot water supply return pipe 5 Hot water return return pipe 6 Temperature rise return pipe
10 Water supply connection pipe
11 Dispersion tube
11a Small discharge hole
12 Water supply riser
15 Hot water supply pump
16 Boiler return pump
17 Boiler (heating means)

Claims (2)

In an open-type hot water storage tank that has a circulation path with the heating means, is supplied according to fluctuations in the water level, and uses hot water that stays in the upper layer using natural heads to supply hot water to the consumption place.
Connected to a water supply pipe for water supply, and provided with a dispersion pipe disposed along the bottom surface of the hot water storage tank,
A water supply device for an open-type hot water storage tank, wherein an appropriate number of discharge small holes are formed in the dispersion pipe, the discharge direction being a direction other than the direction above the hot water storage tank.   2. The water supply device for an open-type hot water storage tank according to claim 1, wherein a hot water return pipe for heating to the heating means is connected to one end of the dispersion pipe.

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