JP6519841B2 - Electric water heater - Google Patents

Description

  The present invention relates to an electric water heater that heats and discharges water supplied from a water supply.

  As an electric water heater that heats and discharges water supplied from a water supply, one having a structure provided with a tank having an electric heater inside is known. Such an electric water heater can discharge hot water of an appropriate temperature immediately after the start of water discharge by storing the water supplied from the water supply in a tank while being heated by the electric heater. is there. In addition, while the water discharge is continued, the tank continues to be supplied with cold water from the water supply, but the cold water is also heated by the electric heater and becomes hot water and then discharged.

  In such an electric water heater, cold water is supplied from the lower portion of the tank, and the heated water is generally discharged from the upper portion of the tank through an electric heater provided at the center of the tank. However, when cold water is supplied from the lower part of the tank, the temperature of the hot water in the tank is lowered by mixing with the hot water heated by the electric heater, and the heat exchange efficiency in the tank is lowered. In particular, when the tank is miniaturized, the heated hot water and the hot water supplied from the lower portion of the tank are easily mixed, which further causes a decrease in heat exchange efficiency.

  Therefore, as shown in Patent Document 1, a baffle plate is provided near the cold water supply port at the lower part of the tank, and the cold water flowing into the tank is made to collide with one arm-type baffle plate to make the flow rate of the cold water It weakens and is made to flow into the inside of the tank in a straightening state. By reducing the flow rate of the cold water, the hot water stored in the tank is pushed up to the water outlet without being stirred by the influent water, and it is always possible to discharge hot water of a constant temperature.

JP-A-8-327147

  In the water discharger of Patent Document 1, although the flow velocity of the cold water flowing into the tank is reduced, the cold water colliding with the baffle plate collides with the bottom of the tank and flows into the tank toward the upper side of the tank. In particular, when the capacity of the tank is small, when the cold water flows toward the upper side of the tank, mixing with the hot water can not be avoided, and as a result, the temperature of the hot water is lowered.

  The present invention has been made in view of such problems, and an object thereof is to prevent mixing of the water flowing into the tank with the hot water stored above the tank without directing the water flowing into the tank above, at all times. An object of the present invention is to provide an electric water heater capable of spouting warm water of appropriate temperature.

In order to solve the above problems, an electric water heater according to the present invention is an electric water heater that heats and discharges water supplied from a water pipe, comprising: a supply unit for supplying water; and water supplied from the supply unit A hot-water storage tank for storing water, a hot-water discharge part for discharging hot water in the hot-water storage tank, and a heater provided in the hot-water storage tank for heating water stored in the hot-water storage tank; Guide means comprising a plurality of plate-like members provided at the bottom of the hot water storage tank at the supply port to which water is supplied from the supply section and in the vicinity of the supply port and horizontally guiding the water supplied from the supply port And distribution means for distributing a flow path of water supplied from the supply port for each of the plurality of plate-like bodies of the guide means, the distribution means comprising: among the plurality of plate-like bodies It flows toward the said hot spring part The most downstream side is not formed in a plate-like body disposed in and has a plate-like body other than the plate-like body disposed on the most downstream side of the.

  In the above aspect, the guide means is configured in multiple layers by a plurality of plate-like members, and the distributing means further distributes the flow path of the water supplied from the supply port for each of the plurality of plate-like members. The flow velocity of the inflowing water can be reliably reduced. Further, since the guide means guides the water supplied from the supply port in the horizontal direction, the inflowing water does not flow along the wall surface of the tank and does not flow upward of the tank. Thereby, even when the capacity of the tank is small, the water flowing into the tank does not diffuse into the tank, and the mixing with the hot water stored above the tank can be suppressed.

  In a preferred embodiment, the distribution means equalizes the flow rate of water flowing through the flow paths. In this aspect, the water flowing into the tank uniformly spreads from the bottom of the tank by equalizing the flow velocity flowing in the flow path formed in the multi-layered plate-like body. Therefore, it is possible to prevent the temperature drop of the hot water due to the rapid mixing of the hot water and the water in the tank.

  In a preferred aspect, the distribution means is an opening formed in at least one of the plurality of plate-like members. In this aspect, the distribution means can be realized by a simple configuration in which the opening is formed in the plate-like body.

  In a preferred aspect, the guide means is formed by laminating three or more sheets of the plate-like body, and the distribution means is disposed such that the opening corresponds to the opening of the supply port, and the opening area of the opening Is formed smaller as the plate-like body is disposed farther from the supply port. In this aspect, as a means for equalizing the flow velocity, the opening area of the opening is formed smaller as the plate-like body is disposed away from the supply port. The further away from the supply port, the lower the flow velocity of the inflowing water, but each flow of the guide means by making the opening area of the opening away from the supply port smaller than the opening area of the opening near the supply port. It is possible to equalize the flow velocity of water flowing through the channel.

  In a preferred aspect, in the plurality of plate-like members, the distance between the bottom surface of the hot water storage tank and the plate-like members disposed on the bottom surface side of the hot water storage tank is equal to the distance between the plate-like members. Will be placed. In this aspect, it is possible to uniformly disperse the flow rate flowing from the supply port by configuring the flow paths formed in the guide means to be equal to each other. This allows the water flowing into the tank to be spread evenly from the bottom of the tank.

  According to the present invention, it is possible to provide an electric water heater capable of spouting hot water of a proper temperature at all times by suppressing mixing with hot water stored above the tank without directing water flowing into the tank above the tank. Can.

It is a figure which shows the external appearance of the state in which the electric water heater of embodiment of this invention was connected to the faucet. It is a schematic diagram which shows the whole structure of the electric water heater of embodiment of this invention. It is a top view which shows the structure of the guide part in the electric water heater of embodiment of this invention. It is AA sectional drawing of FIG. It is a BB sectional view of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In order to facilitate understanding of the description, the same constituent elements in the drawings are denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  An electric water heater according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a view showing an appearance of a state in which an electric water heater 1 according to a first embodiment of the present invention is connected to a shower faucet 200. Moreover, FIG. 2 is a schematic diagram which shows the whole structure of the electric water heater 1. As shown in FIG.

  As shown in FIG. 1, the electric water heater 1 is a device installed between the water supply 100 and the shower faucet 200, and the water supplied from the water supply 100 is heated by the water heater 300 to be a hot water. This hot water is supplied to the shower faucet 200 and is a device for discharging water from the shower faucet 200. The water supply 100 is formed by two systems of a hot water path H and a cold water path C. The hot water path H and the cold water path C are provided with valves VC1 and VH1 and valves VC2 and VH2, respectively, and check valves 31 and 32 are provided downstream of the valves VH2 and VC2. The hot water path H and the cold water path C are mixed in the shower faucet 200.

  The electric water heater 1 is configured of a casing 10, a water supply pipe 20, and a water discharge pipe 30. Inside the casing 10, on the water supply pipe 20, a check valve 21 and a temperature switching valve 22 are provided from the water supply 100 side, that is, from the upstream side. The water supply pipe 20 is divided by the temperature switching valve 22 into a flow path flowing into the tank 40 and a flow path flowing into the water discharge pipe 30. The tank 40 is provided with a heater (not shown), and the hot water sent from the water supply pipe 20 flows in from the supply port 41 formed on the bottom via the hot water supply pipe 23 and is heated by the heater and formed on the upper surface The discharge port 42 is configured to flow toward the water discharge pipe 30 via the hot water discharge pipe 24.

  Subsequently, the configuration of the electric water heater 1 will be specifically described with reference to FIG. As illustrated in FIG. 2, the electric water heater 1 is described with reference to FIG. 1 with the hot water supply port 26 where hot water flows into the water supply pipe 20 described in FIG. 1, the check valve 21 and the temperature switching valve 22. A hot water supply pipe 24 connected to the temperature switch valve 22 and a water discharge pipe 30 connected to the temperature switch valve 22 are provided on the downstream side of the feed water pipe 20. The check valve 21, the temperature switching valve 22, the hot water supply pipe 23, the hot water discharge pipe 24, the hot water supply port 26, the overpressure relief valve 27 and the hot water discharge port 28 are not specific to this embodiment but are similar to the conventional one. So detailed explanation is omitted.

  In the electric water heater 1, the hot water sent from the hot water supply pipe 23 described above flows in from the supply port 41 formed in the bottom of the tank 40, is stored in the tank 40, and is formed in the upper surface of the tank 40. The water is discharged from the discharge port 42 into the hot water discharge pipe 24.

  The tank 40 includes a guide portion 43 in which a plurality of plate-like members (baffle plates) are stacked in the vicinity of the supply port 41. In the present embodiment, the guide portion 43 is formed by stacking three flat plate bodies 43 a, 43 b and 43 c, and is supported by the support members 43 d and 43 e and fixed to the bottom surface of the tank 40.

  The detailed configuration of the guide portion 43 will be described with reference to FIGS. 3 to 5. 3 is a plan view of the guide portion 43, FIG. 4 is a sectional view taken along the line AA of FIG. 3, and FIG. 5 is a sectional view taken along the line BB of FIG. As FIG. 3 shows, the plate-like bodies 43a-43 which comprise the guide part 43 make area the same, and planar shape is circular. The circular plate-like members 43a to 43c are provided with a pair of support members 43d and 43e in the diametrical direction on a part of the circumference. As shown in FIG. 5, the support members 43d and 43e are L-shaped in side view, and are integrally formed with the plate-like body 43a. The support members 43d and 43e are fixed to the bottom of the tank 40 at the bottom of the L-shape. The plate-like members 43b and 43c are joined to the support members 43d and 43e from the inside by forming a rise on a part of the circumference.

  The plate-like members 43a to 43c support the support members 43d and 43e so that the intervals between the bottom surface of the tank 40 and the plate-like member 43c, the plate-like member 43c and the plate-like member 43b, and the plate-like member 43b and the plate-like member 43a are equal. The support members 43d and 43e are attached to the bottom surface of the tank 40. As shown by broken lines in FIG. 3, openings 43bH and 43cH are respectively provided at the centers of the plate-like members 43b and 43c.

  The openings 43bH and 43cH play the role of distributing means for distributing the flow path of water supplied from the supply port 41 formed at the bottom of the tank 40 for each of the plurality of plate-like members 43a to 43c of the guide 43 . That is, as shown by the alternate long and short dash line in FIG. 4, in the plurality of plate-like members 43a to 43c of the guide portion 43, the plate-like member 43c and the plate-like member 43b are between the bottom of the tank 40 and the plate-like member 43c. The water flow paths FC, FB, FA are formed between the plate 43b and the plate 43a, respectively. The openings 43cH and 43bH thus distribute the water supplied from the supply port 41 to the flow paths FC, FB and FA.

  Further, as shown in FIG. 4, the opening 43 b H and the opening 43 c H are arranged to correspond to the opening of the supply port 41 formed on the bottom surface of the tank 40. That is, the central position of the opening 43bH, the opening 43cH, and the supply port 41 are formed to coincide with each other.

  Furthermore, as is clear from FIGS. 3, 4 and 5, the opening 43cH is formed to have a larger opening area than the opening 43bH. That is, the opening areas of the openings 43bH and 43cH are formed to be smaller as the plate-like members are disposed apart from the supply port 41. The reason why the opening area of the opening is made smaller as the plate-like member is disposed apart from the supply port 41 is to equalize the flow velocity flowing in each flow path. In other words, the openings 43bH and 43cH, which are the distribution means, equalize the flow velocity of the water flowing through the flow paths FA, FB and FC. This is because the flow velocity of the inflowing water decreases as the distance from the supply port 41 increases, but the opening area of the opening 43 bH away from the supply port 41 is smaller than the opening area of the opening 43 cH near the supply port 41 Thus, the flow velocity of the water flowing through the flow path FA and the flow path FB can be equalized.

  According to the electric water heater 1 as described above, the guide portion 43 is configured in multiple layers by the plurality of plate-like members 43a to 43c, and the flow paths FA of water supplied from the supply port 41 with the openings 43bH and 43cH. , FB, and FC, the flow velocity of the water flowing into the tank 40 can be reliably reduced. In addition, since the guide portion 43 guides the water supplied from the supply port 41 in the horizontal direction, the water flowing into the supply port 41 does not flow along the wall surface of the tank 40 and does not flow upward of the tank 40 . As a result, even when the capacity of the tank 40 is small, the water flowing into the tank 40 does not diffuse into the tank 40, and the mixing with the hot water stored above the tank 40 can be suppressed.

  The openings 43bH and 43cH equalize the flow velocity of water flowing through the flow paths FA, FB, and FC. The water flowing into the tank 40 uniformly spreads from the bottom of the tank 40 by equalizing the flow velocity flowing through the flow paths FA, FB, FC formed in the multi-layered plate-like members 43 a to 43 c. . Therefore, the temperature drop of the warm water due to the rapid mixing of the warm water and the water in the tank 40 can be prevented. Also, the means for distributing can be realized by a simple configuration in which the openings 43bH and 43cH are formed in the plate-like members 43b and 43c.

  Further, the plate-like member 43b is disposed such that the openings 43bH and 43cH correspond to the opening of the supply port 41 and the opening areas of the openings 43bH and 43cH are spaced apart from the supply port 41 than the plate-like member 43c. It is formed small. As the further from the supply port 41, the flow velocity of the inflowing water decreases, but by making the opening area of the opening 43bH away from the supply port 41 smaller than the opening area of the opening 43cH closer to the supply port 41, The flow velocity of the water flowing through each of the flow paths FA, FB, FC of the guide portion 43 can be made uniform.

  Further, by configuring the flow paths FA, FB, and FC formed in the guide portion 43 to be equal, the flow rate flowing from the supply port 41 can be dispersed uniformly. Thus, the water flowing into the tank 40 can be spread evenly from the bottom of the tank 40.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. That is, those to which those skilled in the art appropriately modify the design of these specific examples are also included in the scope of the present invention as long as they have the features of the present invention. For example, each element included in each specific example described above and its arrangement, material, conditions, shape, size, and the like are not limited to those illustrated, and can be appropriately changed. Moreover, each element with which each embodiment mentioned above is equipped can be combined as much as technically possible, and what combined these is also included in the scope of the present invention as long as the feature of the present invention is included.

  Specifically, although the plate-like members 43a to 43c constituting the guide portion 43 are configured to be circular in the above embodiment, the present invention is not limited to such an aspect, and the plate-like members are supplied from the supply port. As long as it guides horizontally water, it is also possible to comprise by polygons, such as a rectangle.

  Moreover, in the said embodiment, although the plate-shaped body of the guide part 43 was comprised with three sheets, if it is two or more sheets, it is also possible to laminate | stack and comprise how many sheets. In addition, when a plate-like body is comprised by two sheets, the opening part formed in a plate-like body is formed only in one near the supply port 41 of the tank 40. As shown in FIG. On the other hand, when the plate-like body is constituted by three or more sheets, for example, four sheets, the opening is formed in three sheets from the side closer to the supply port 41. Moreover, when a plate-like body is comprised by four sheets, the opening area of an opening part is formed so small that the plate-like body arrange | positioned away from the supply port 41. As shown in FIG.

  Furthermore, the guide portion 43 is configured such that the distance between the bottom surface of the tank 40 and the plate 43c, between the plate 43c and the plate 43b, and between the plate 43b and the plate 43a is equal. In the openings 43bH and 43cH formed in ~ 43c, 43bH is larger and 43cH is smaller. The present invention is not limited to such an embodiment, and as long as the flow velocity of the water flowing through the flow path formed between the plate-like members of the guide portion 43 is uniform, the distance between the plate-like members and the plate-like members are formed. The size of the opening to be made can be adjusted appropriately.

1: Electric water heater 10: Casing 20: Water supply piping 21: Check valve 22: Temperature change valve 23: Hot water supply pipe 24: Hot water supply pipe 26: Hot water supply port 27: Overpressure relief valve 28: Hot water discharge port 30: Water discharge pipe 31, 32: check valve 40: tank 41: supply port 42: discharge port 43: guides 43a to 43c: plate-like members 43d, 43e: support members 43bH, 43cH: opening 100: water supply 200: shower faucet 300: hot water supply Unit C: Cold water path FA, FB, FC: Flow path H: Hot water path VC1, VH1, VC2, VH2: Valve

Claims (5)

In the electric water heater that heats and discharges the water supplied from the water supply,
A supply unit for supplying water;
A hot water storage tank for storing water supplied from the supply unit;
A hot water outlet for pouring water from the hot water storage tank;
A heater provided in the hot water storage tank and heating water stored in the hot water storage tank;
The hot water storage tank is
A supply port to which water is supplied from the supply unit at the bottom of the hot water storage tank;
Guiding means comprising a plurality of plate members provided in the vicinity of the supply port and horizontally guiding water supplied from the supply port;
Distribution means for distributing a flow path of water supplied from the supply port for each of the plurality of plate-like members of the guide means;
The distribution means is not formed on the most downstream side of the water flowing toward the tapping portion of the plurality of plate-like bodies, and is arranged on the most downstream side An electric water heater characterized by being formed into a plate- like body other than a plate-like body .   The electric water heater according to claim 1, wherein the distribution means equalizes the flow velocity of the water flowing in each of the flow paths.   The electric water heater according to claim 1 or 2, wherein the distribution means is an opening formed in at least one of the plurality of plate-like members. The guide means is formed by laminating three or more of the plate-like bodies,
The distribution means is arranged such that the opening corresponds to the opening of the supply port,
The electric water heater according to claim 3, wherein an opening area of the opening portion is formed smaller as the plate-like body disposed farther from the supply port.   The plurality of plate members are disposed such that the distance between the bottom surface of the hot water storage tank and the plate members disposed on the bottom surface side of the hot water storage tank is equal to the distance between the plate members. The electric water heater according to any one of claims 1 to 4.

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