JPH02279937A - Feed-intake device of water of thermal stratification type heat storage tank - Google Patents

Abstract

PURPOSE:To form excellent thermal stratification without disturbing conditions in a tank and thereby to improve the efficiency of heat storage by a construction wherein the outer peripheral opening of a guide member is directed upward when the member is provided in the vicinity of an upper-side channel and made to communicate with the upper-side channel, while the outer peripheral opening of the other guide member is directed downward when the member is provided in the vicinity of a lower-side channel and made to communicate with the lower-side channel. CONSTITUTION:Guide members 34 and 35 are constituted of circular grooves 38 and 39 having openings 36 and 37 above and below respectively, and the circular grooves 38 and 39 are provided concentrically with a tank 31, while the openings 36 and 37 are positioned on the same horizontal plane respectively. The upper-side guide member 34 is so constituted as to be positioned below a water surface in the tank at the depth being larger than the vertical thickness thereof, and the outer peripheral openings 36 and 37 are so positioned as to make a circle along the inner peripheral surface of the tank. The guide member 34 functions as a buffer area weakening the force of water. Thereby the kinetic energy of water is reduced and the water flows into the tank 31 at a low flow speed with a uniform distribution in the form of a horizontal plane. Accordingly, the water can be fed without disturbing thermal stratification in the tank 31 so much.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water supply device for a temperature stratified heat storage tank that stores heat by forming temperature stratification in the tank by utilizing the density difference due to the temperature difference of water.

In this type of heat storage tank, the temperature stratification within the tank must not be disturbed by the intake water. However, in the conventional heat storage tank of this kind, the water intake port is not particularly devised, and as shown in Fig. 1, the flow path 2.3 is directly connected from the outside to the upper and lower sides of the tank l. It is simply composed of For this reason, in terms of water supply, turbulence occurs in the tank 1 when water is supplied,
This will disturb the ambient temperature stratification as indicated by the arrow. Mano,
Because water flows unevenly only from the pressure shown in the figure into the tank L where temperature stratification is to be formed, it is not possible to supply water into the tank L with a uniform distribution in the horizontal direction. The balance of temperature stratification will be disturbed.

Therefore, for example, when high-temperature water is injected from the upper channel 2 into a tank l in which low-temperature water is stored, the injected high-temperature water mixes with the low-temperature water without forming a high-temperature layer.
Satisfactory temperature stratification cannot be formed, and the performance of the heat storage tank will be significantly reduced. This is true not only for water supply but also for water intake, and also for the lower flow path.

This invention was made in consideration of the following two points, and is a temperature stratified heat storage type that can reduce turbulence that occurs in the tank during water intake, form a satisfactory temperature stratification, and improve heat storage efficiency. The purpose is to provide a water supply device for a tank.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of the present invention, and numeral 31 in the figure is a tank. This tank 31 is a tower-shaped heat storage tank (for example, cylindrical)
, and below there is a flow path 32 that runs inside and outside the tank 31.
．． 33 are provided, and water is supplied to the tank 31 through these channels 32 and 33. Guide layers 34, 35 are provided at the inner mouths of the tanks 31 of these channels 32, 33, respectively, in the form of protruding from the inner peripheral surface of the tank 3I. The guide members 34, 35 are , in this example, openings 36, 37 on one side and on the bottom, respectively.
The annular groove 38.39 is arranged concentrically with the tank 31, and the openings 36 and 37 are respectively located in the same horizontal plane. Here, the annular 1ilY38 has a link-shaped flange portion 38a that projects horizontally from the inner circumferential surface of the tank.
and an f17i-shaped portion 38b that rises upward from the end of the flange portion 38a and is formed into a short τj cylindrical shape. The structure was formed between. The annular groove 39 also includes a link-shaped flange portion 39a that projects horizontally from the inner circumferential surface of the tank, and a cylindrical portion 381 that is formed into a short cylindrical shape and hangs downward from the end of this flange portion 39a.
These flange portion 38a and cylindrical portion 38
b and the inner peripheral surface of the tank 31.

The annular grooves 38 and 39 are designed to have a size that does not interfere with the area where temperature stratification is formed within the tank 31 (in this case, the temperature stratification is formed around the center of the tank 31). In addition, the annular opening 36.37 is provided on the entire outer circumference of the guide member 34.35. In this case, the opening area of the opening 36.37 is:
The cross-sectional area of each of the channels 32 and 33 is naturally larger.

Further, as shown in FIG. 2(a), the guide members 34 and 35 are respectively arranged at positions spaced apart from the bottom surface of the tank 31, and the guide members 34 on the second side are
It is configured to be located below the water surface in the tank at a depth equal to or greater than the vertical thickness of the guide member 34. Furthermore, the outer circumferential openings 36,37 of the guide members 34,35 are positioned so as to go around the inner circumferential surface of the tank as shown.

Next, the operation of the device configured as described above will be explained, taking as an example the case where water is supplied from the upper channel 32 into the tank 33 via the guide member 34.

Water entering the tank 31 from the upper channel 32 circulates within the annular guide member 34 and flows into the tank 31 so as to overflow from the opening 36. Therefore, Guide Shrine 3
4 functions as a buffer zone that weakens the force of the water, the kinetic energy of the water is reduced, and the water flows into the tank 31 at a low flow rate with uniform distribution in the horizontal plane. Therefore, water can be supplied without disturbing the temperature stratification within the tank 31. The same can be said for water intake.

Therefore, taking as an example the case where water is actually supplied, changes in the tank i-+ over time will be explained with reference to FIGS. 3 to 5.

In actual use, this type of heat storage tank uses the density difference of water depending on temperature to form temperature stratification, so the upper layer is a high temperature layer and the lower layer is a low temperature layer.
, water), the upper channel is used, and the lower channel is used for low temperature water (cold water). Therefore, here, in the tank 3I in which low-temperature water is stored, there is a second flow path 32.
We will discuss the case where high-temperature water is allowed to flow in from.

First, Figure 3 shows the state where the inflow starts. In the tank 31 in which low-temperature water is stored, the high-temperature water first circulates inside the annular kite member 34 and slowly overflows from the opening 36 into the tank. 31, and from there it flows radially in the horizontal direction so as to narrow the ring. At this time, the flow flows into the tank 3I gently without hunting, and with even distribution in the horizontal direction, so there is no turbulence and the flow is well-balanced. , floating slightly to one side, and then, as shown in Figure 4, opening 1.
] A mixed layer M is formed slightly above the guide member 34 (i.e., the water supply port portion) having 36. As water is supplied more and more, an ideal temperature stratification is formed, including a two-layer high-temperature layer I, a mixed layer M below it, and a low-temperature layer C1 at the bottom. At this time, the mixed layer M functions as a heat insulating layer.

Although not shown in the figure, low-temperature water follows the inflow of high-temperature water.
It is made to flow out from the lower flow path 33. This case can also be considered in the same way as the case of inflow. In other words, in this case, tank 31
The low-temperature water inside flows into the guide member 35 from the open ring 37 and is discharged to the outside of the tank 31 through the channel 33. At that time, since the openings 37 are on the same horizontal plane,
It flows gently into the guide member 35 with even distribution, and does not disturb the surrounding temperature stratified environment much.

On the other hand, for example, if the hot water supplied from the guide member 34 is at a higher temperature than the hot water at the lower part of the tank (J or not, the guide member 34
If the temperature is lower than that of one of the hot water layers (this phenomenon often occurs especially in the first stage of hot water supply), the supplied hot water overflows from the guide member 34 in the horizontal direction. After flowing, the mixture slowly descends below the guide member 34 and forms a mixed layer there.

Therefore, it is possible to obtain the special effect that the guide member 34 does not have an adverse effect such as turbulence on the second high-temperature layer. Forming a mixed layer underneath the high-temperature layer without affecting it in this way quickly forms a stable temperature stratification in which vertical convection is difficult to occur. The formation of can be efficiently promoted.

In addition, in the example described in "2," a case was described in which high temperature water is supplied from the upper channel 32 and low temperature water is taken from the lower channel 33. Side channel 3
In the case of taking water from No. 2, it can be similarly done without disturbing temperature stratification.

In addition, as a guide member, upper and lower, as in the above embodiment,
Providing guide members of the same shape so as to correspond to each other can better maintain the balance within the tank.

As explained below, the present invention provides a guide which is formed by providing an annular groove that goes around the inner periphery of the tank inside a filter tank with a flow path underneath and openings around the entire outer periphery. The members were provided so that their outer peripheral openings were located on the same horizontal plane, the guide member of the bracket was placed in communication with the flow path, and the guide member was provided near the upper flow path (Jteka) and communicated with the second side flow path. In the case where the guide member is provided near the lower flow path and communicates with the lower flow path, the outer peripheral opening 1 is configured to face downward. from,
When water is supplied to the tank, water can flow in and out with an even distribution in the horizontal direction within the tank, forming good temperature stratification without disturbing the environment inside the tank, improving heat storage efficiency. It is something that can be achieved.

In particular, according to the present invention, since the outer circumferential openings of the guide member are on the same horizontal plane, water flows in an annular direction toward the center of the tank with an even distribution in the horizontal direction when water is supplied, and the ring spreads out when taking water. In this way, the effect of flowing into the guide member with even distribution is produced, and as a result, the surrounding temperature stratified environment is not disturbed. These effects are achieved by the fact that the outer opening is located on the circumference, that the guide member is arranged concentrically with respect to the tank, and that the guide member is arranged in a pair below. In other words, the state of the water flowing in and out of the tank does not deviate greatly from the center of the tank in the horizontal direction, and the state of the water flow in and out of the tank does not deviate greatly from the center of the tank ( J performs an annular wide or pinched movement with an even distribution, and as a result of precisely realizing this flow state, these points greatly contribute to the formation of good temperature stratification, improving heat storage efficiency. It makes people move in the opposite direction.

Furthermore, according to the present invention, since the upper guide member is configured to be located below the water surface in the tank at a depth equal to or greater than the thickness of the guide member in the downward direction, the supply from the upper guide member is particularly effective. If the filtered hot water is at a lower temperature than the hot water layer on one side of the guide member, the supplied hot water will overflow horizontally from the kite part side and then gently descend downward. A mixed layer is formed there, and as a result, a unique effect can be obtained in that the guide member does not have an adverse effect such as turbulence on the high temperature layer.

In this way, the ability to form a mixed layer beneath the high-temperature layer without affecting it will quickly form a stable temperature stratification that is less likely to cause downward convection. This provides excellent effects such as being able to efficiently promote the formation of thermal stratification.

In addition, since the guide member under 1 is provided so as to go around the inner circumference of the tank in a manner that follows the inner circumference of the tank, this guide member not only has a rectifying effect but also strengthens the tank. Therefore, the structure is particularly suitable for configuring 1 (14) heat storage tanks.

[Brief explanation of drawings]

Figure 1 is a side view showing a conventional example, Figure 2 (a), (1))
Figures 3 to 5 show an embodiment of the present invention; (a) is a side view of the iJ, (b) is a partial perspective view of the second part of the device J, and Figures 3 to 5 show water actually supplied using the same embodiment. It is a side view which shows a case. 31. Tank, 32. 33. Channel, 34. 35 Guide part shrine, 36. 37 Opening, 38. 39. Annular groove.

Claims (1)

[Claims] In a thermal stratification type heat storage tank that has a water flow path at the top and bottom of the tank that connects the inside and outside of the tank, and stores heat by forming temperature stratification of the water in the tank, an outer peripheral opening that goes around the inner circumference of the tank. A pair of guide members formed into annular grooves having an annular groove are provided on the upper and lower sides of the inner circumferential surface of the tank to communicate with the corresponding upper and lower channels, respectively, and the outer circumferential opening of the guide member that communicates with the upper channel is directed upward. At the same time, the outer peripheral opening of the guide member that communicates with the lower flow path is directed downward, and the outer peripheral openings of both guide members are arranged on the same horizontal plane and on the same circumference, and are connected to the tank. The guide members are provided concentrically with respect to each other, and both of the guide members are arranged at positions spaced apart from the upper and lower surfaces of the tank, and the upper guide member has a thickness greater than or equal to the thickness of the guide member in the vertical direction. A water supply device for a temperature stratification type heat storage tank, characterized in that the water intake device is located below the water surface in the tank.