JP4029285B2 - Solar water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a natural circulation solar water heater installed on, for example, a roof, and more particularly to a technique capable of collecting as much hot water stored in a hot water storage tank as possible.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as this type of natural circulation type solar water heater, a hot water storage tank and a solar heat collector connected to the hot water storage tank at a lower position are generally known. In such a solar-powered water heater, when the collector receives solar heat during the daytime and the internal water temperature rises, the water in the hot water tank repeats natural circulation by convection between the heat collector and the hot water tank. The water in the hot water storage tank is replaced with hot water.
[0003]
A hot water collecting pipe is disposed in the hot water storage tank. The hot water collecting pipe has a base end fixed to the hot water supply port, and the hot water supply port at the front end is a free end with a float attached in the vicinity thereof. On the other hand, it is configured such that it can be freely bent depending on whether the whole is formed by a flexible hose or a flexible portion is provided in the middle. Then, the float is maintained so that the hot water outlet is submerged just below the hot water surface in the hot water storage tank, and if the hot water level fluctuates, the hot water pipe is bent so that the hot water outlet moves up and down following it, The hot water in the upper layer in the hot water storage tank is taken out and used for hot water supply.
[0004]
When hot water collection is continued with the hot water collecting pipe in a state where water supply to the hot water storage tank is stopped, the hot water storage level gradually decreases and finally decreases to the vicinity of the bottom surface of the hot water storage tank. Will also descend to the vicinity of the bottom surface. For this reason, it has been proposed to provide a recessed portion into which the hot water outlet at the lowered position enters the bottom surface of the hot water storage tank so as to collect as much hot water as possible from the hot water storage tank (for example, Patent Document 1). Or refer to Patent Document 2).
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 60-43957 [Patent Document 2]
Japanese Utility Model Publication No. 61-27058 [0006]
[Problems to be solved by the invention]
However, in the hot water storage tank provided with a concave portion on the bottom surface as proposed above, although it can be convenient to perform hot water sampling with the intermittent hot water sampling method (also referred to as the lot hot water sampling method), the hot water collecting tank with the continuous hot water sampling method is used. When performing, there may be a situation where the hot water cannot be sufficiently collected even though hot water is still in the hot water storage tank.
[0007]
That is, the above-mentioned continuous hot water collecting system is a system in which the hot water is supplied from the hot water storage tank while the hot water is collected and the hot water storage tank is always kept at a predetermined constant water level. For example, referring to the example of FIG. 7, when a hot water supply curan (not shown) is opened, hot water in the upper layer of the hot water storage tank 200 is drawn from the hot water collection port 701 of the hot water collection pipe 700 and hot water is supplied. When the ball tap 400 is lowered, the float 401 of the ball tap 400 is lowered to open the water supply port 402 to supply water, and when the water level rises to a predetermined water level by water supply, the float 401 is raised to close the water supply port 402, thereby Maintained. Then, the supplied cold water is dropped into the lower part of the hot water storage tank 200 through the water conduit 600, and the hot water portion is pushed upward. At this time, the hot water sampling port 701 of the hot water sampling pipe 700 is maintained in an elevated state (state indicated by a solid line in FIG. 7) submerged in the hot water storage upper layer by the float 702, and the hot water of the hot water storage upper layer is sucked from the hot water sampling port 701. On the other hand, in the intermittent hot water sampling method, hot water is collected in a state where water supply is stopped, and the hot water level in the hot water storage tank 200 is sequentially lowered by hot water collecting, and finally the hot water outlet 701 is lowered to the vicinity of the bottom surface. (Refer to the state indicated by the one-dot chain line in FIG. 7.)
[0008]
The above-mentioned rising hot water outlet 701 is positioned slightly below the hot water surface of the hot water because there is a possibility that if the hot water inlet 701 is positioned just below the hot water surface, air may flow in and the hot water collection cannot be continued due to the siphon action. As shown, the mounting position relationship with the float 702 is set. For this reason, the hot water in the uppermost layer between the hot water outlet 701 and the hot water storage water surface always remains without being sampled. Usually, the hot water storage tank 200 is formed in a horizontally long shape (for example, 1 to 2 m), and a large volume of hot water obtained by multiplying the area corresponding to the length by the depth of the uppermost layer is not collected. Will remain.
[0009]
This invention is made | formed in view of such a situation, The place made into the objective is to be able to collect hot water as much as possible and effectively.
[0010]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a hot water storage tank having a forward / return circulation port for circulating between a water supply port, a hot water supply port and a solar heat collector, and a base end connected to the hot water supply port. It is intended for solar water heater and a bendable Toyu tube to adopt sprue tip moves up and down to follow the variation of the hot water level in the hot water storage tank by a float, and comprise the following specific features did.
[0012]
That is, in the invention according to claim 1, said to hot water storage tank, a convex space extending in a horizontal plane by remote upwardly through the inner surface of the top wall portion of the other portion projecting a part of the top wall upwardly form compartments form therein, located above Symbol convex space reserved hot water the hot water storage tank receives the water from the water supply port is an upper position than the horizontal plane passing through the inner surface of the top wall of the other portion set to be maintained in a state, and there just below the position of the hot-water storage water level above adopted sprue by the Toyukan the float follows the said hot-water storage water level crowded enters the convex space In the past, it was arranged so as to be kept submerged .
[0013]
In the case of the invention according to claim 1 , when hot water stored in the hot water storage tank by heat collection of the heat collector is continued from the hot water sampling port positioned in the convex space by the continuous hot water sampling method, Even if the hot water storage level drops due to hot water sampling, water supply corresponding to the hot water collection is performed as the water level drops, so that the hot water level is maintained in the convex space and hot water is stored in the convex space. and while maintaining the state of the inter-hot-water air, it is maintained in even adopted sprue positioned convex space. On the other hand, as the hot water in the hot water storage tank gradually decreases due to hot water sampling, the supplied water sequentially enters the lower layer, and the remaining hot water is pushed up. And even if the position below the inner surface of the top wall is replaced with water, the hot water in the convex space is still sucked from the hot water outlet. Here, the convex space is located at the uppermost position in the hot water storage space in the hot water storage tank, and the top wall portion is partially protruded. It becomes smaller than that at the position below the inner surface of the top wall portion excluding this convex space. For this reason, it becomes possible to effectively extract hot water remaining in the narrow area of the convex space from the hot water outlet, and the hot water in the hot water storage tank can be used for hot water use almost to the end. Become.
[0015]
In Solar water heater of the invention, (claim 2) by arranging the water supply port faces to the convex space, the convex-shaped space as the inter-disposing space of volume Rutappu which are usually employed as a water inlet Can be used effectively.
[0016]
The solar water heater of the above invention further includes a water guide pipe that guides water supplied from the water supply port to the bottom of the hot water storage tank, and the water guide flow from the upper end of the water guide pipe to the lower end facing the bottom. the flow biasing may be formed a bend to buffer (claim 3). By doing so, the cold water supplied from the water supply port is not mixed with the hot water in the hot water storage tank, but the cold water is gently guided to the bottom of the hot water storage tank and allowed to flow into the collector side. Is possible. That is, when the water supplied from the water supply port is dropped to the bottom of the hot water storage tank through a straight water conduit, the cold water introduced by the flow and the hot water in the hot water tank returned from the collector are agitated and mixed. This is because the hot water heated by the heat collector cannot be used sufficiently effectively. In particular, by applying the solar water heater according to claim 2 , even if the water supply port is disposed in the same convex space, the water supply from the water supply port and the hot water in the convex space are not mixed. It becomes possible to use the hot water in the space by leaving hot water for hot water collection.
[0017]
【The invention's effect】
As described above, according to the solar water heater according to any one of claims 1 to 3 , a convex space continuous with the internal space is provided as a hot water storage space in the upper portion of the hot water storage tank. Since the hot water sampling port of the hot water sampling pipe enters, the hot water remaining in the narrow area of the convex space can be sucked from the hot water sampling port in the case of continuous hot water sampling. It is possible to collect hot water in the tank as effectively as possible.
[0019]
In particular, according to claim 2, can also be effectively used as inter disposing space of volume Rutappu which are usually adopted the convex space as a water inlet, it is possible to reduce the size of the entire hot water storage tank.
[0020]
Furthermore, according to the third aspect , sufficient mixing of the hot water heated by the heat collector by suppressing the mixing / stirring of the hot water in the hot water storage tank already stored and the hot water stored in the hot water storage tank is possible. Effective use can be achieved. In particular, even if the water supply port is arranged in the same convex space as in claim 2 , mixing of the water supplied from the water supply port and the hot water in the convex space is prevented, and the hot water in the convex space is collected. Therefore, it can be used effectively.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 shows a natural circulation solar water heater according to an embodiment of the present invention. This solar-heated water heater is a hot water storage tank 2 and one or more heat collectors 3 and 3 connected to the hot water storage tank, usually installed obliquely downward at a position below the hot water storage tank (drawing). The hot water storage tank 2 is provided with a downstream end of a water supply pipe 4 having a water supply main plug 41 (see FIG. 2) in the middle thereof, and a hot water supply currant 51 on the downstream end side. The upstream end of the hot water supply pipe 5 to which (see FIG. 2) is connected is connected.
[0023]
As shown in FIG. 2, the hot water storage tank 2 has a horizontally long main body 22 that defines a horizontally long main body space 21 inside, and a part of the top wall portion 221 of the main body 22 (the end portion in the illustrated example) is located upward. And a convex portion 24 that defines a convex space 23 inside. A hot water storage space is constituted by all of the main body space 21 and a part of the convex space 23. A step portion 241 is formed on the convex portion 24, whereby the top surface is positioned higher than the horizontal plane passing through the inner surface 221 a of the top wall portion 221 and a hot water outlet 71 of the hot water collecting pipe 7 described later enters. A step-like convex space 23 is formed, which is a convex space portion 23a and a convex space portion 23b in which a float 432 of a ball tap 43 described later is disposed.
[0024]
The hot water storage tank 2 is provided with a water supply port 42 at an upper position facing the convex space 23 of the side wall 222 on the convex portion 24 side, and an upper end is opened facing the water supply port 42 so that the hot water storage tank is provided. 2, the water guide pipe 6 extending downward along the side wall portion 222 to a position near the bottom wall portion 223 is disposed, and a hot water supply port 52 is disposed at an intermediate position in the vertical direction facing the main body space 21 of the side wall portion 222. Further, a hot water collecting pipe 7 whose base end is connected to the hot water supply port 52 is disposed with its hot water collecting port 71 extending to the main body space 23 side. Furthermore, in the bottom wall portion 223 of the hot water storage tank 2, circulation outlets 224 and 224 through which hot water flows into the heat collectors 3 and circulation return ports 225 through which hot water from the heat collectors 3 is returned. On the other hand, a concave portion 226 is formed which enters when the hot water collection port 71 of the hot water collecting pipe 7 is in a lowered state (a state indicated by a one-dot chain line in FIG. 2). The circulation return port 225 is opened at the bottom of the recess 226.
[0025]
The water supply port 42 includes a ball tap 43, and receives a water supply from the water supply pipe 4 connected to the water supply port 42 by the ball tap 43, so that a hot water storage level in the hot water storage tank 2 is set in advance (a set hot water storage water level). HL). That is, the ball tap 43 has a swingable support arm 431 and a float (floating ball) 432 attached to the tip of the support arm 431, and the float 432 descends from the set hot water storage water level based on the water level fluctuation. Then, a piston valve (not shown) is opened by the downward swing of the support arm 431 and water supply is started. On the other hand, when the float 432 rises to the set hot water storage water level HL due to the water level rise due to the water supply, the support arm 431 swings upward. Thus, the piston valve is closed to stop water supply. Thus, the water supply port 42 is configured to supply water for the amount of hot water collected from the hot water collecting pipe 7 so as to always maintain the hot water storage tank 2 at a constant set hot water storage level HL.
[0026]
As shown in FIG. 3, the set hot water storage water level HL is set at a horizontal position above a horizontal plane passing through the inner surface 221a of the top wall portion 221 and entering the convex space 23 by a predetermined depth. ing. Specifically, the set hot water storage water level HL may be set so that all the hot water inlets 71 in the raised state (shown by solid lines in FIG. 2) that have entered the convex space portion 23a in the convex space 23 can be submerged. The set hot water storage water level HL may be set so that all of the convex space portion 23a is submerged. The set hot water storage water level HL may be set by adjusting the vertical position of the float 432 of the ball tap 43 constituting the water supply port.
[0027]
The water guide pipe 6 guides the water supplied from the water supply port 42 to the hot water storage tank 2 to a position near the bottom wall 223 of the hot water storage tank 2, that is, to the bottom of the main body space 21 of the hot water storage tank 2. It is installed in order to prevent unnecessary mixing of cold water and hot water already heated by each collector 3. A bent portion 61 is provided at an intermediate portion of the water guide pipe 6 for cutting and relaxing the flow of water descending the water guide pipe 6. The bent portion 61 is formed by bending or curving in the front / rear / left / right direction with a relatively large bend R, and as shown in FIG. It is bent, bent downward, bent backward, and finally bent downward to extend to the bottom. The bent portion 61 also plays a role of bypassing the hot water collection pipe 7.
[0028]
The hot water collection pipe 7 is entirely composed of a flexible tube material such as a rubber hose, and is configured to be relatively freely bendable with a flexible portion 72 formed of a bellows or the like at an intermediate position. . A float 73 is attached to a predetermined position on the upper end of the hot water sampling port 71 at the free end, and the buoyancy of the float 73 keeps the hot water sampling port 71 completely submerged in the vicinity of the hot water storage surface, The position can be moved up and down following the fluctuation of the hot water level. That is, when hot water sampling is performed by the continuous hot water sampling method, the hot water sampling port 71 is maintained at the position immediately below the set hot water storage water level HL and in the above-described rising state submerged, while hot water sampling by the intermittent hot water sampling method is performed. Is performed following the drop in the water level, and finally the position is changed to the above-described lowered state that has entered the recess 226. Such position conversion of the hot water inlet 71 between the raised state and the lowered state is realized by bending at the flexible portion 72 and bending of the entire hot water collecting pipe 7.
[0029]
In the solar water heater described above, when the hot water supply main tap 41 is first opened, water supply from the water supply port 42 into the hot water storage tank 2 is started by pressure such as tap water, and all of the heat collectors 3 and the hot water storage tank 2 are supplied. When the set hot water storage level HL is filled with water, the water tap 42 is closed by the ball tap 43 and water supply is stopped.
[0030]
In this state, the daytime solar heat is collected by the heat collectors 3 and 3 and the internal water is heated to raise the temperature, and then lightens and flows upward to be returned to the hot water storage tank 2 from the circulation return ports 225 and 225. On the other hand, relatively cool and heavy water is dropped from the hot water storage tank 2 into the heat collectors 3 through the circulation outlets 224 and 224. And the natural circulation based on such a convection action is repeated, the water temperature in the hot water storage tank 2 rises, and it will be in a hot water storage state.
[0031]
Next, in order to perform hot water collection by the intermittent hot water collection method from the hot water storage state, the hot water supply currant 51 may be opened with the water supply main tap 41 closed. Then, since the hot water sampling port 71 in the raised state is maintained in a submerged state, hot water is sucked in by the siphon action from the hot water sampling port 71, and the sucked hot water passes through the hot water sampling tube 7, the hot water supply port 52, and the hot water supply tube 5. After being led to the hot water supply curan 51, the hot water is discharged. As the hot water continues, the hot water level in the hot water storage tank 2 decreases sequentially, and the hot water outlet 71 also descends while maintaining the submerged state following the decrease in the hot water level. When the stored hot water level falls below the position of the upper surface of the bottom wall portion 223 of the hot water storage tank 2, the hot water remaining at the end is collected in the concave portion 226 and sucked from the hot water outlet 71 where the hot water in the concave portion 226 has been lowered. Is issued. Thus, by forming the concave portion 226 into which the hot water inlet 71 enters, hot water sampling up to a stage where the hot water storage water level becomes lower than the upper surface position of the bottom wall portion 223 can be realized.
[0032]
In addition, in order to perform hot water collection using the continuous hot water sampling method from the hot water storage state instead of the intermittent hot water sampling method, the hot water supply currant 51 may be opened while the water supply main tap 41 remains open. Then, as described above, hot water is sucked from the hot water outlet 71 and discharged from the hot water supply currant 51. In this case, water is supplied from the water supply port 42 by the amount reduced by the hot water supply. Although it varies somewhat depending on the balance between the flow rate and the feed water flow rate, the hot water storage tank 2 is in a state where the set hot water storage level HL is substantially maintained. The water supplied from the water supply port 42 is guided to the bottom of the hot water storage tank 2 through the water conduit 6 and flows into the circulation outlet 224, and wraps around the bottom of the hot water storage tank 2 to push the hot water in the hot water storage tank 2 upward. Will go. When this tendency continues, the thickness of the hot water layer decreases, and finally, the hot water is filled up to the level of the inner surface 221a of the top wall portion 221 and finally the hot water is only in the upper convex space 23. Will remain. Even in such a state, since the hot water collection port 71 is maintained in the raised state that has entered the convex space 23, the hot water remaining in the convex space 23 can be sampled. Therefore, more hot water can be collected effectively than in the case of a conventional hot water storage tank having no convex space.
[0033]
<Other embodiments>
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the above embodiment, the convex space 23 is formed in a stepped shape including the convex space portions 23a and 23b. However, the present invention is not limited to this, and for example, one convex space as shown in FIG. 25 may be formed.
[0034]
Moreover, in the said embodiment, although the water supply port 42 and the ball tap 43 were arrange | positioned in the same one convex-shaped space 23,25, and the case where the hot-water-collecting port 71 entered the upper state was shown, it does not restrict to this. The arrangement position of the ball tap 43 and the arrangement position of the hot water outlet 71 may be different from each other. For example, as shown in FIG. 6, two different convex portions 26 and 27 projecting upward from the top wall portion 221 of the hot water storage tank 2 a are formed, and a water supply port with a ball tap 43 is formed in a space 28 in one convex portion 26. 42, and the hot water collection pipe 7 may be disposed so that the raised hot water collection port 71 enters the convex space 29 in the other convex portion 27.
[0035]
As a bent form of the bent portion 61 of the water guide pipe 6, for example, curved shapes that bulge alternately in the front, rear, left, and right may be combined.
[0036]
In addition, even if the convex parts 24 and 27 for forming the convex spaces 23, 25, and 29 are formed integrally with the main body of the hot water storage tanks 2 and 2a, they are joined separately. Anyway, any may be sufficient.
[Brief description of the drawings]
FIG. 1 is an external view showing an embodiment of the present invention.
FIG. 2 is a schematic diagram schematically showing the embodiment of FIG. 1 in a vertical cross-sectional state.
3 is a partial cross-sectional explanatory view taken along line AA in FIG. 2;
FIG. 4 is a partial perspective view showing an example of a bent portion of a water conduit.
FIG. 5 is a partial schematic view showing another form of the convex space.
6 is a schematic view of a hot water storage tank having a convex space of another form different from FIG. 5. FIG.
FIG. 7 is a schematic view showing a hot water storage tank in a cross-sectional state for explaining the problem of the present invention.
[Explanation of symbols]
2,2a Hot water storage tank 3 Heat collector 6 Water conduit 7 Hot water collection pipe 23, 25, 29 Convex space (hot water storage space)
42 Water supply port 52 Water supply port 61 Bending portion 71 Sampling port 73 Float 221 Top wall portion 221a Inner surface 224 of the top wall portion Circulation outlet (circulation port)
225 Circulation return port (circulation port)
HL set hot water level

Claims (3)

A hot water storage tank having a forward / return circulation port for circulation between the hot water supply port, the hot water supply port, and the solar heat collector, and a base end connected to the hot water supply port and a leading hot water collection port in the hot water storage tank by a float. In a solar water heater equipped with a hot water collecting pipe that can be bent up and down following the fluctuation of the hot water storage level,
Above the hot water storage tank part of the top wall is convex space protrudes upward spread in a horizontal plane by remote upwardly through the inner surface of the top wall portion of the other part is made compartment form therein,
The hot water storage tank to be maintained in the hot water storage water receiving water is positioned above Symbol convex space a position above the horizontal plane passing through the inner surface of the top wall portion of the other part from the water supply port And set to
The Toyukan, as the float is by following the above hot-water storage water level, the adopted sprue is maintained in a state of being crowded in submerged and a position immediately below the hot-water storage water level enters the convex space A solar water heater characterized by being arranged. A solar water heater according to claim 1 ,
A solar water heater that is provided with a water supply opening facing the convex space. A solar water heater according to any one of claims 1 and 2 ,
A water conduit that guides the water supplied from the water supply port to the bottom of the hot water storage tank;
A solar-heated water heater in which a bent portion is formed between the upper end of the water conduit and the lower end facing the bottom so as to buffer the flow of the water flow.

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