JP2017146014A - Storage electric water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage electric water heater which heats water to make it into hot water while heating a heat storage material.SOLUTION: A storage electric water heater 1 includes: a heat storage material 20 housed in a device body 10; a heater 30 which heats the heat storage material 20; a heat exchanger tube 40 which is disposed contacting with the heat storage material 20 in the device body 10 and conducts heat exchange between water circulating therein and the heat storage material 20; and a heat exchanger member 50 which is formed by a material having thermal conductivity higher than that of the heat storage material 20 and is placed in contact with the heater 30 and the heat exchanger tube 40 so as to transfer heat.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a regenerative electric water heater.

  Conventionally, a heat storage type electric water heater including a heat storage material, a heater, and a heat transfer tube is known. The heat storage material is accommodated in a case as the apparatus main body. The heat transfer tube is configured such that heat exchange can be performed between the water circulating in the heat transfer tube and the heat storage material in a state of being in contact with the heat storage material inside the case (see Patent Document 1). .

JP 2001-296060 A

  In the apparatus described in Patent Document 1, the heater and the heat transfer tube are not in contact with each other, and a heat storage material exists between the heater and the heat transfer tube. Since the heat storage material is heated from the portion of the heat storage material that is in contact with the surface of the heater, the portion of the heat storage material located on the surface of the heat transfer tube is not heated at the time when the heat storage material is being heated. The portion of the heat storage material is not in a state of storing heat, and water cannot be sufficiently heated through the heat transfer tube to make hot water.

  The present invention has been made in view of the above, and an object of the present invention is to provide a regenerative electric water heater that can warm water to hot water during heating of the heat storage material.

  In order to achieve the above object, the present invention provides a heat storage material (for example, a heat storage material 20 to be described later) housed in an apparatus main body (for example, a device main body 10 to be described later) and a heater (for example, a heat storage material to be described later). Heater 30), which will be described later, is disposed in contact with the heat storage material inside the apparatus main body, and water (for example, water W, which will be described later) is circulated therein to exchange heat between the water and the heat storage material. A heat transfer tube (for example, heat transfer tube 40 to be described later) to be performed and a heat transfer member (for example, to be described later) that is configured by a material having higher thermal conductivity than the heat storage material and is in contact with the heater and the heat transfer tube. A heat storage type electric water heater (for example, a heat storage type electric water heater 1 to be described later).

  It is preferable that a contact area between the heat transfer tube and the heat storage material (for example, a contact area x described later) is larger than a contact area between the heat transfer tube and the heat transfer member (for example, a contact area y described later). Moreover, it is preferable that the said heater is arrange | positioned in the lower part inside the said apparatus main body.

  The heater is a portion of the heat transfer tube located inside the apparatus main body, and is disposed close to a water inflow portion (for example, an inflow portion 435 described later) of the heat transfer tube into which water flows. It is preferable. Moreover, it is preferable that the said heat-transfer member is a part of the said heat-transfer tube located inside the said apparatus main body, Comprising: It is contacting the inflow part of the said heat-transfer tube into which water flows in.

  In addition, a heat transfer fin (for example, heat transfer fin 61 described later) protruding from the outer peripheral surface of the heat transfer tube is provided, and the heat transfer member is in contact with the heat transfer tube through the heat transfer fin so as to transfer heat. It is preferable.

  ADVANTAGE OF THE INVENTION According to this invention, the heat storage type electric water heater which can warm water during heating of a heat storage material and can be used as hot water can be provided.

It is a mimetic diagram showing heat storage type electric water heater 1 concerning a 1st embodiment of the present invention. Sectional drawing which shows the contact with the upper end part of the heat transfer member 50 and the heat exchanger tube 40 of the thermal storage type electric water heater 1 which concerns on 1st Embodiment of this invention, and the lower end part of the heat transfer member 50, and the heater 30. It is. It is a schematic diagram which shows a mode that the thermal storage material 20 is heated in the thermal storage type electric water heater 1 which concerns on 1st Embodiment of this invention, (a) shows the state before the thermal storage material 20 is warmed by the heater 30. It is a schematic diagram, (b) is a schematic diagram which shows the state in which the part of the heat storage material 21 which is contacting the surface of the heater 30 was warmed and stored heat, (c) is the heater 30 and the heat-transfer member 50. It is a schematic diagram which shows the state in which the part of the thermal storage materials 21 and 22 which are contacting the surface of this was warmed and stored, (d) is contacting the surface of the heater 30, the heat-transfer member 50, and the heat-transfer tube 40. It is a schematic diagram which shows the state which the part of the thermal storage material 21,22,23 which is warmed and stored the heat, (e) is a schematic diagram which shows the state which the whole thermal storage material 20 was warmed and stored. It is sectional drawing which shows a contact with the upper end part and lower end part of the heat-transfer member 50A of the thermal storage type electric water heater which concerns on 2nd Embodiment of this invention, the heater 30, and the heat exchanger tube 40. FIG. It is sectional drawing which shows a contact with the upper end part and lower end part of the heat-transfer member 50B of the thermal storage type electric water heater which concerns on 3rd Embodiment of this invention, the heater 30, and the heat exchanger tube 40. FIG. It is sectional drawing which shows a contact with the upper end part and the lower end part of the heat-transfer member 50C of the thermal storage type electric water heater which concerns on 4th Embodiment of this invention, and the heater 30 and the heat exchanger tube 40. FIG. It is sectional drawing which shows the heat exchanger tube 40D of the thermal storage type electric water heater which concerns on 5th Embodiment of this invention. It is sectional drawing which shows the heater 30E of the thermal storage type electric water heater which concerns on 6th Embodiment of this invention. It is a schematic diagram which shows the thermal storage type electric water heater 1F which concerns on 7th Embodiment of this invention. It is a mimetic diagram showing heat storage type electric water heater 1G concerning an 8th embodiment of the present invention. It is a mimetic diagram showing heat storage type electric water heater 1H concerning a 9th embodiment of the present invention. It is a mimetic diagram showing heat storage type electric water heater 1I concerning a 10th embodiment of the present invention. It is a mimetic diagram showing heat storage type electric water heater 1J concerning an 11th embodiment of the present invention.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.
Drawing 1 is a mimetic diagram showing heat storage type electric water heater 1 concerning a 1st embodiment of the present invention. FIG. 2 shows contact between the upper end portion of the heat transfer member 50 and the heat transfer tube 40 of the regenerative electric water heater 1 according to the first embodiment of the present invention, and contact between the lower end portion of the heat transfer member 50 and the heater 30. FIG.
FIG. 3 is a schematic diagram illustrating a state in which the heat storage material 20 is heated in the heat storage type electric water heater 1 according to the first embodiment of the present invention, and (a) is a state before the heat storage material 20 is warmed by the heater 30. It is a schematic diagram which shows the state of this, (b) is a schematic diagram which shows the state in which the heat storage material 21 around the heater 30 was warmed and stored heat, (c) is the surface of the heater 30 and the heat-transfer member 50 It is a schematic diagram which shows the state which the part of the heat storage materials 21 and 22 which are contacting in the warming was warmed up, and (d) is contacting the surface of the heater 30, the heat-transfer member 50, and the heat-transfer tube 40. It is a schematic diagram which shows the state in which the part of the thermal storage material 21,22,23 was warmed and stored, (e) is a schematic diagram which shows the state which the whole thermal storage material 20 was warmed and stored.

The heat storage type electric water heater 1 is a device used as a hot water heater for warming water in a washstand or the like to make hot water, for example, and as shown in FIG. 1, a device main body 10, a heat storage material 20, a heater 30, a heat transfer tube 40, and a heat transfer member 50.
The apparatus main body 10 is configured by a hollow container. A temperature sensor 11 and a pressure adjustment valve 13 are provided on the upper part of the apparatus main body 10. The temperature sensor 11 can detect the temperature of the heat storage material 20 accommodated in the space inside the apparatus body 10. The pressure adjustment valve 13 adjusts so that the inside of the apparatus main body 10 is maintained at atmospheric pressure even if a change in deposition accompanying solidification and melting of the heat storage material 20 inside the apparatus main body 10 occurs. Thus, since the pressure adjusting valve 13 as the pressure adjusting mechanism is provided, the apparatus main body 10 does not have to have a pressure-resistant structure (pressure-resistant shape).

  The heat storage material 20 is housed inside the apparatus main body 10, and an air chamber 101 is formed between the upper end of the heat storage material 20 and the upper wall of the apparatus main body 10. The air chamber 101 has a volume that can prevent the heat storage material 20 from overflowing from the apparatus main body 10 even when all of the heat storage material 20 is melted into a liquid. The heat storage material 20 surrounds the surfaces of the heater 30, the heat transfer tube 40, and the heat transfer member 50. In other words, the heater 30, the heat transfer tube 40, and the heat transfer member 50 are immersed in the heat storage material 20, and each of the heater 30, the heat transfer tube 40, and the heat transfer member 50 is interposed between the heater 30, the heat transfer tube 40, and the heat transfer member 50. The heat storage material 20 exists. For example, a latent heat storage material of sugar alcohol such as erythritol is used as the heat storage material 20. The heat storage material 20 is solid at room temperature, but is heated by the heater 30 to store heat and become a liquid.

  The heater 30 is disposed in the lower part inside the apparatus main body 10 and is electrically connected to a power source (not shown). The heater 30 has a small power consumption of 1500 W or less, and is supplied with electric power from a power source (not shown) to generate heat by changing electric energy into heat. The heater 30 is formed in a cylindrical shape, and extends along the bottom of the apparatus main body 10 at the lower part inside the apparatus main body 10. When the heater 30 generates heat, the portion of the heat storage material 20 that is in contact with the surface of the heater 30 is heated to store heat.

  The heat transfer tube 40 is configured by a copper hollow tube member having heat transfer properties. Water W circulates inside the heat transfer tube 40, and heat exchange is performed between the water W and the heat storage material 20 through the heat transfer tube 40. One end 41 and the other end 42 of the heat transfer tube 40 are arranged outside the apparatus main body 10, and an intermediate portion 43 between the one end 41 and the other end 42 is arranged inside the apparatus main body 10. ing. The other end 42 of the heat transfer tube 40 is disposed vertically above the one end 41 of the heat transfer tube 40. The intermediate portion 43 of the heat transfer tube 40 is a lower portion inside the apparatus main body 10, extends along the heater 30 above the heater 30, curves and extends upward, and moves away from the heater 30. It is further curved and extends in parallel with the heater 30 above the heater 30 at the upper part inside the apparatus main body 10 and reaches the other end 42. A portion of the intermediate portion 43 that extends in the left-right direction and that is located on the lower side in FIG. 1 constitutes an upstream portion 431 that is located on the upstream side of the water W flow. The portion of the intermediate portion 43 that extends in the left-right direction and that is located on the upper side in FIG. 1 constitutes the downstream portion 432 that is located on the downstream side of the flow of the water W.

  A portion of the intermediate portion 43 adjacent to the one end portion 41 is a portion of the intermediate portion 43 of the heat transfer tube 40 located inside the apparatus main body 10, and an inflow portion 435 of the water W of the heat transfer tube 40 into which the water W flows. Configure. That is, one end 41 of the heat transfer tube 40 is connected to a water supply unit (not shown), and the water W flows into the heat transfer tube 40 from the one end 41 of the heat transfer tube 40, and from the inflow portion 435 to the heat transfer tube 40. , And is discharged from the other end 42 of the heat transfer tube 40 to the outside of the heat transfer tube 40 and discharged from a faucet device (not shown). Accordingly, the water W passes through the lower part inside the apparatus main body 10, from the lower part inside the apparatus main body 10 to the upper part inside the heat transfer tube 40, and passes through the upper part inside the apparatus main body 10. The upstream side portion 431 of the intermediate portion 43 including the water W inflow portion 435 of the heat transfer tube 40 is disposed close to the heater 30 as shown in FIG.

  Here, "the upstream side portion 431 of the intermediate portion 43 is disposed close to the heater 30" is earlier than the downstream side portion 432 that is other than the upstream side portion 431 of the intermediate portion 43, The upstream portion 431 of the intermediate portion 43 is disposed closer to the heater 30 than the downstream portion 432 so that heat is transferred to the upstream portion 431 of the intermediate portion 43 via the heat transfer member 50. Means.

  The heat transfer member 50 is made of copper, which is a material having higher thermal conductivity than the heat storage material 20, and is formed in a cylindrical shape. The lower end portion of the heat transfer member 50 has a lower end extending portion 511 extending in parallel with the longitudinal direction of the heater 30, and the lower end extending portion 511 is in direct contact with the upper surface of the heater 30 so as to be able to transfer heat. Connected and fixed. The upper end portion of the heat transfer member 50 is connected and fixed in a state where it directly contacts the downstream side portion 432 of the heat transfer tube 40 so that heat can be transferred. The central portion of the heat transfer member 50 in the vertical direction is connected and fixed in a state in which it directly contacts the upstream side portion 431 of the heat transfer tube 40 so as to be able to transfer heat.

  The diameter D1 of the heat transfer member 50 (the width in the left-right direction of the heat transfer member 50 shown in FIG. 2) is smaller than the outer diameter D2 of the heat transfer tube 40. For this reason, when viewed in the cross section shown in FIG. 2, the heat transfer member 50 is in contact with a portion of the circumference of the heat transfer tube 40 that is less than or equal to a half circumference. Therefore, the contact area x in the contact portion X between the heat transfer tube 40 and the heat storage material 20 is larger than the contact area y in the contact portion Y between the heat transfer tube 40 and the heat transfer member 50. As shown in FIG. 1, three heat transfer members 50 are provided at equal intervals along the direction of the heater 30, but the central portion in the vertical direction of the heat transfer member 50 located at the leftmost in FIG. The water W inflow portion 435 of the heat transfer tube 40 is in contact.

Next, changes in the state of the regenerative electric water heater 1 when the water W is heated to hot water while the heat storage material 20 is being heated in the regenerative electric water heater 1 will be described.
As shown in FIG. 3A, when the heat storage material 20 reaches a normal temperature while the heater 30 is not generating heat, the heat storage material 20 is in a solid state and does not store heat. In addition, the heater 30, the heat transfer tube 40, and the heat transfer member 50 are at room temperature, like the heat storage material 20.

  First, when the temperature sensor 11 detects that the temperature of the heat storage material 20 is equal to or lower than a predetermined temperature with the main power source of the regenerative electric water heater 1 turned on, power is supplied from the power supply unit (not shown) to the heater 30. The heater 30 generates heat. Thereby, as shown in FIG.3 (b), the part of the thermal storage material 20 which is contacting the surface of the heater 30 begins to store heat, and turns into a liquid. At this time, the heat transfer tube 40 and the portion of the heat storage material 20 that is in contact with the surface of the heat transfer tube 40 are not yet stored, and the temperature of the heat storage material 20 is low.

  When the heater 30 generates heat, heat is transmitted to the heat transfer member 50 having higher thermal conductivity than the heat storage material 20, and the temperature of the heat transfer member 50 reaches from the lower end to the upper end of the heat transfer member 50 in a short time. To rise. Accordingly, as shown in FIG. 3C, the portion of the heat storage material 22 that is in contact with the surface of the heat transfer member 50 starts to store heat from the surface of the heat transfer member 50 and becomes liquid. At this time, the temperature of the portion of the heat transfer tube 40 connected to the heat transfer member 50 and the temperature of the portion of the heat storage material 20 in contact with the surface of the portion of the heat transfer tube 40 also rise.

  Further, when the temperature rises from the lower end portion to the upper end portion in the heat transfer member 50, the downstream side portion 432 of the intermediate portion 43 of the heat transfer tube 40 that is in contact with the upper end portion and the center portion of the heat transfer member 50, the upstream Heat is transmitted to the side portion 431, and the temperature rises in the entire intermediate portion 43 of the heat transfer tube 40 located inside the apparatus main body 10. Accordingly, as shown in FIG. 3 (d), the portion of the heat storage material 23 that is in contact with the surface of the intermediate portion 43 of the heat transfer tube 40 starts to store heat from the surface of the heat transfer tube 40 and becomes liquid. At this time, the temperature of the entire intermediate portion 43 of the heat transfer tube 40 and the temperature of the portion of the heat storage material 23 that is in contact with the surface of the intermediate portion 43 are increased, and the inside of the heat transfer tube 40 is passed through the heat transfer tube 40. Heat exchange is sufficiently performed between the flowing water W and the heat storage material 20. Thereby, when the water W flows through the inside of the heat transfer tube 40, the water W is sufficiently warmed, and the sufficiently warmed water W flows out from the other end portion 42 of the heat transfer tube 40. That is, in a short time after the heater 30 starts to generate heat, the sufficiently warmed water W flows out from the other end portion 42 of the heat transfer tube 40.

  When the heat of the heater is transmitted through the heat transfer member 50 and the heat transfer tube 40, the temperature of the heat storage material 20 rises, and the entire heat storage material 20 becomes liquid as shown in FIG. Thereby, since the heat storage material 20 is in a state where heat is sufficiently stored, when the water W flows inside the heat transfer tube 40, the water W flowing inside the heat transfer tube 40 is sufficiently warmed, and the heat transfer tube 40 is heated. From the other end portion 42, the sufficiently warmed water W flows out.

  Further, when the temperature of the heat storage material 20 rises, the temperature sensor 11 detects that the temperature of the heat storage material 20 has exceeded a predetermined temperature, and the supply of power to the heater 30 is stopped. When the temperature of the heat storage material 20 decreases due to heat exchange between the water W flowing through the heat transfer tube 40 and the heat storage material 20 through the heat transfer tube 40 after the supply of power to the heater 30 is stopped, The sensor 11 detects that the temperature of the heat storage material 20 has become equal to or lower than a predetermined temperature, and power is supplied to the heater 30 again.

According to the regenerative electric water heater 1 according to the embodiment having the above configuration, the following effects can be obtained.
The heat storage type electric water heater 1 is disposed in contact with the heat storage material 20 inside the apparatus main body 10, the heat storage material 20 housed inside the apparatus main body 10, the heater 30 that heats the heat storage material 20, and the inside of the apparatus main body 10. The heat transfer tube 40 that exchanges heat between the water W and the heat storage material 20 through which the water W circulates and a material having higher thermal conductivity than the heat storage material 20 can transfer heat to the heater 30 and the heat transfer tube 40. And a heat transfer member 50 connected in contact therewith.

  With this configuration, since the heat of the heater 30 can be transmitted to the heat transfer tube 40 via the heat transfer member 50, the temperature of the heat transfer tube 40 can be increased in a short time. For this reason, it is possible to store heat in a short time with respect to the portion of the heat storage material 20 that is in contact with the surface of the heat transfer tube 40, and between the heater 30 and the heat transfer tube 40, a solid state that has not yet been stored. Even if the heat storage material 20 remains, the portion of the heat storage material 20 that is in contact with the surface of the heat transfer tube 40 can be warmed in a short time. As a result, the portion of the heat storage material 20 that is in contact with the surface of the heat transfer tube 40 even when part of the heat storage material 20 is still in the middle of heating the entire heat storage material 20. Therefore, heat exchange can be performed via the heat transfer tube 40 between the heat storage material 20 of this portion and the water W flowing inside the heat transfer tube 40. Can be warmed to make hot water.

  Further, the heat transfer member 50 has a configuration in which the heat transfer member 50 is in contact with and connected to the heater 30 and the heat transfer tube 40, thereby facilitating heat storage in the heat storage material 20 in contact with the surface of the heat transfer tube 40. Therefore, the regenerative electric water heater 1 does not increase in size. For this reason, it can be set as the thermal storage type electric water heater 1 by which the enlargement of the apparatus was suppressed. In addition, since it is not necessary to have a tank having a pressure-resistant structure, the shape of the entire apparatus of the regenerative electric water heater 1 can be determined appropriately and freely, and the degree of freedom of layout in the place where the regenerative electric water heater 1 is disposed. Can be increased. Therefore, for example, it is also possible to arrange the regenerative electric water heater 1 in a dead space such as a washstand.

  Further, the contact area x between the heat transfer tube 40 and the heat storage material 20 is larger than the contact area y between the heat transfer tube 40 and the heat transfer member 50. With this configuration, the area where the heat transfer tube 40 contacts the heat storage material 20 for heat exchange between the heat storage material 20 and the water W flowing inside the heat transfer tube 40 is increased via the heat transfer tube 40. Therefore, a large amount of heat can be transmitted from the heat storage material 20 to the water W, and the heat exchange can be performed more efficiently.

  Further, the heater 30 is disposed in the lower part inside the apparatus main body 10. With this configuration, when the entire heat storage material 20 is stored in a liquid state, the heat storage material 20 located in the upper part of the inside of the apparatus body 10 is stored using the convection of the heat storage material 20. can do.

  In addition, the heater 30 is an intermediate portion 43 of the heat transfer tube 40 located inside the apparatus main body 10, and is disposed close to the inflow portion 435 of the water W of the heat transfer tube 40 into which the water W flows. With this configuration, heat storage of the heat storage material 20 portion that is in contact with the surface of the inflow portion 435 can be facilitated, and the low-temperature water W that has flowed into the inflow portion 435 can be easily warmed. In addition, since the water W warmed in the inflow portion 435 flows through the intermediate portion 43 on the downstream side of the inflow portion 435, the heat storage material 20 that is in contact with the surface of the intermediate portion 43 on the downstream side of the inflow portion 435. The amount of heat transferred from the portion to the water W can be reduced, and the overall heat efficiency of the regenerative electric water heater 1 can be increased.

  The heat transfer member 50 is a portion of the heat transfer tube 40 located inside the apparatus main body 10 and is in contact with the inflow portion 435 of the water W of the heat transfer tube 40 into which the water W flows. With this configuration, heat can be easily transferred from the heat transfer member 50 to the inflow portion 435. For this reason, the heat storage of the portion of the heat storage material 20 that is in contact with the surface of the inflow portion 435 can be facilitated, and the low-temperature water W flowing into the inflow portion 435 can be easily warmed. In addition, since the water W warmed in the inflow portion 435 flows through the intermediate portion 43 on the downstream side of the inflow portion 435, the heat storage material 20 that is in contact with the surface of the intermediate portion 43 on the downstream side of the inflow portion 435. The amount of heat transferred from the portion to the water W can be reduced, and the overall heat efficiency of the regenerative electric water heater 1 can be increased.

Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a cross-sectional view showing contact between the upper end portion and the lower end portion of the heat transfer member 50 </ b> A of the heat storage type electric water heater according to the second embodiment of the present invention, the heater 30, and the heat transfer tube 40.
In the second embodiment, the shape of the heat transfer member 50A is different from the shape of the heat transfer member 50 in the first embodiment. About the structure similar to 1st Embodiment, it illustrates using the same code | symbol and abbreviate | omits description.

  As shown in FIG. 4, the heat transfer member 50 </ b> A is formed in a columnar shape that is thinner than the heat transfer member 50 in the first embodiment. The lower end surface of the heat transfer member 50 </ b> A is in contact with the upper surface of the heater 30, and the upper end surface of the heat transfer member 50 </ b> A is in contact with the lower surface of the heat transfer tube 40. Therefore, the heat transfer member 50A and the heater 30 are in surface contact with a very small contact area such as point contact. Similarly, the heat transfer member 50 </ b> A and the heat transfer tube 40 are in surface contact with a very small contact area such as point contact.

Next, a third embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a cross-sectional view showing contact between the upper end portion and the lower end portion of the heat transfer member 50B of the heat storage type electric water heater according to the third embodiment of the present invention, the heater 30, and the heat transfer tube 40.
In the third embodiment, the shape of the heat transfer member 50B is different from the shape of the heat transfer member 50 in the first embodiment. About the structure similar to 1st Embodiment, it illustrates using the same code | symbol and abbreviate | omits description.

  As shown in FIG. 5, the heat transfer member 50 </ b> B is formed in a thin plate shape and extends in parallel to the heater 30 and the downstream side portion 432 of the heat transfer tube 40. The lower end edge of the heat transfer member 50B is connected and fixed to the uppermost part of the upper surface of the heater 30, and the upper end edge of the heat transfer member 50B is connected to and connected to the lowermost part of the lower surface of the heat transfer tube 40. Has been fixed. Therefore, the heat transfer member 50 </ b> B and the heater 30 are in surface contact with a very small contact area such as line contact. Similarly, the heat transfer member 50 </ b> B and the heat transfer tube 40 are in surface contact with a very small contact area, such as line contact.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 6 is a cross-sectional view showing contact between the upper end portion and the lower end portion of the heat transfer member 50C of the heat storage type electric water heater according to the fourth embodiment of the present invention, the heater 30, and the heat transfer tube 40.
In the fourth embodiment, the shape of the heat transfer member 50C is different from the shape of the heat transfer member 50 in the first embodiment. About the structure similar to 1st Embodiment, it illustrates using the same code | symbol and abbreviate | omits description.

  As shown in FIG. 6, the heat transfer member 50 </ b> C is formed in a thicker plate shape than the third embodiment, and extends in parallel to the heater 30 and the downstream side portion 432 of the heat transfer tube 40. The thickness of the heat transfer member 50C (the width of the cross section of the heat transfer member 50C in the left-right direction in FIG. 6) is smaller than the outer diameter of the heat transfer tube 40 and the diameter of the heater 30, and the heat transfer member 50 according to the first embodiment. It is the same as the diameter D1. The upper end portion of the heat transfer member 50C is connected and fixed in contact with the lower surface of the heat transfer tube 40, and the lower end portion of the heat transfer member 50C is connected and fixed in contact with the upper surface of the heater 30. . Therefore, the heat transfer member 50C and the heater 30 are in surface contact. Similarly, the heat transfer member 50C and the heat transfer tube 40 are in surface contact.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
FIG. 7 is a cross-sectional view showing a heat transfer tube 40D of a regenerative electric water heater according to a fifth embodiment of the present invention.
In the fifth embodiment, the shape of the heat transfer tube 40D is different from the shape of the heat transfer tube 40 in the first embodiment. About the structure similar to 1st Embodiment, it illustrates using the same code | symbol and abbreviate | omits description.
Specifically, the heat transfer tube 40D has a triangular cross section orthogonal to the longitudinal direction of the heat transfer tube 40D. Therefore, also in the space inside the heat transfer tube 40D, the cross section orthogonal to the longitudinal direction of the heat transfer tube 40D is formed in a triangular shape.
In addition, the cross section orthogonal to the longitudinal direction of the heat transfer tube may be formed in a shape such as a polygonal shape other than a triangular shape, or a track elliptical shape combining straight lines and curves. The shape of the heat transfer tube can be appropriately selected in consideration of the effective use of the contact area with the heat storage material 20 and the space.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a cross-sectional view showing a heater 30E of a regenerative electric water heater according to a sixth embodiment of the present invention.
In the sixth embodiment, the shape of the heater 30E is different from the shape of the heater 30 in the first embodiment. Specifically, the heater 30E has a triangular cross section perpendicular to the longitudinal direction of the heater 30E.
In addition, the heater may be formed in a shape such as a polygonal shape other than a triangular shape in cross section perpendicular to the longitudinal direction of the heater, a track ellipse shape combining straight lines and curves, or a thin plate shape. The shape of the heater can be appropriately selected in consideration of the effective use of the contact area with the heat storage material 20 and the space.

Next, a seventh embodiment of the present invention will be described with reference to FIG.
FIG. 9 is a schematic view showing a heat storage type electric water heater 1F according to a seventh embodiment of the present invention.
In the seventh embodiment, the shape of the heat transfer tube 40F is different from the shape of the heat transfer tube 40 in the first embodiment. About the structure similar to 1st Embodiment, it illustrates using the same code | symbol and abbreviate | omits description.

  The heat transfer tube 40F of the regenerative electric water heater 1F is formed in a zigzag shape so as to reciprocate along the heater 30. More specifically, the intermediate portion 43F of the heat transfer tube 40F reciprocates three times in parallel with the longitudinal direction of the heater 30 from the one end portion 41F of the heat transfer tube 40F to the other end portion 42F of the heat transfer tube 40.

Next, an eighth embodiment of the present invention will be described with reference to FIG.
FIG. 10 is a schematic view showing a heat storage type electric water heater 1G according to the eighth embodiment of the present invention.
In the eighth embodiment, the shape of the heat transfer tube 40G is different from the shape of the heat transfer tube 40 in the first embodiment. About the structure similar to 1st Embodiment, it illustrates using the same code | symbol and abbreviate | omits description.

  The heat transfer tube 40 </ b> G is formed in a spiral shape extending along the heater 30. More specifically, the intermediate portion 43G of the heat transfer tube 40G extends in parallel with the longitudinal direction of the heater 30 from one end portion 41G of the heat transfer tube 40G, and is folded at the right end portion of the heater 30 shown in FIG. It is formed in a spiral shape having an axis parallel to the longitudinal direction, extends to the left in FIG. 10, and reaches the other end 42G of the heat transfer tube 40G.

Next, a ninth embodiment of the present invention will be described with reference to FIG.
FIG. 11 is a schematic diagram showing a heat storage type electric water heater 1H according to the ninth embodiment of the present invention.
The ninth embodiment is different from the first embodiment in that the heat transfer fins 61 are provided in the heat transfer tube 40H. About the structure similar to 1st Embodiment, it illustrates using the same code | symbol and abbreviate | omits description.

  The heat transfer fins 61 are formed in a thin copper plate having higher thermal conductivity than the heat storage material 20, and a plurality of heat transfer fins 61 are provided so as to protrude from the outer peripheral surface of the heat transfer tube 40H. The heat transfer fin 61 has a positional relationship in which the front and back surfaces of the heat transfer fin 61 are orthogonal to the longitudinal direction of the upstream side portion 431H and the downstream side portion 432H of the intermediate portion 43H of the heat transfer tube 40H, and the upstream side portion of the intermediate portion 43H. It is connected and fixed to 431H and the downstream side portion 432H so as to be capable of heat transfer. In other words, the heat transfer fin 61 connects the upstream side portion 431H and the downstream side portion 432H so as to be able to conduct heat.

  One of the plurality of heat transfer members 50 is in contact with and connected to the heat transfer tube 40H via the heat transfer fins 61. Specifically, the heat transfer member 50 located at the center in the longitudinal direction of the heater 30 (left and right direction in FIG. 11) is configured to be short in the up and down direction in FIG. The upper end portion of the heat transfer member 50 is connected and fixed to the lower end portion of the heat transfer fin 61 located in the center in the left-right direction in FIG.

  With this configuration, since not only the heat transfer tube 40H but also the front and back surfaces of the heat transfer fins 61 are in contact with the heat storage material 20, it is possible to contact the heat storage material 20 with a wider contact area, and more efficiently, the heat transfer tube 40H. Heat exchange can be performed between the water W circulated in the interior of the water and the heat storage material 20.

Next, a tenth embodiment of the present invention will be described with reference to FIG.
FIG. 12 is a schematic diagram showing a heat storage type electric water heater 1I according to the tenth embodiment of the present invention.
In the tenth embodiment, the shape of the heat transfer tube 40I is different from the shape of the heat transfer tube 40 in the first embodiment. About the structure similar to 1st Embodiment, it illustrates using the same code | symbol and abbreviate | omits description.

  The heat transfer tube 40I of the regenerative electric water heater 1I extends along the heater 30 and is formed in a shape that converges after branching in the middle. More specifically, the intermediate portion 43I of the heat transfer tube 40I extends in parallel to the longitudinal direction of the heater 30 from one end portion 41I of the heat transfer tube 40I, and is folded back at the right end portion of the heater 30 shown in FIG. Branched. Each branched heat transfer tube portion 44I extends parallel to the longitudinal direction of the heater 30 and extends to the left in FIG. 10, converges to one immediately before the other end portion 42I of the heat transfer tube 40I, and heat transfer tube 40I. To the other end 42I. The plurality of branched heat transfer tube portions 44I are arranged at equal intervals in the vertical direction as shown in FIG. The water that has flowed into the intermediate portion 43I from the one end portion 41I flows through the plurality of branched heat transfer tube portions 44I in the direction indicated by the arrow I in FIG.

Next, an eleventh embodiment of the present invention will be described with reference to FIG.
FIG. 13 is a schematic diagram showing a heat storage type electric water heater 1J according to an eleventh embodiment of the present invention.
The eleventh embodiment differs from the first embodiment in that a heater temperature sensor 12J is provided. About the structure similar to 1st Embodiment, it illustrates using the same code | symbol and abbreviate | omits description.

The heater temperature sensor 12J of the regenerative electric water heater 1J is provided in contact with the central portion so that the temperature of the central portion in the longitudinal direction of the heater 30 can be detected. The central part in the longitudinal direction of the heater 30 is the place where the temperature is highest in the regenerative electric water heater 1J. By detecting the temperature of this portion and adjusting the heat generation of the heater 30, the heat storage material 20 is prevented from being excessively heated and the heat storage performance of the heat storage material 20 is reduced.
Moreover, since the heater temperature sensor 12J should just be arrange | positioned in the location where temperature becomes the highest in a thermal storage type electric water heater, it is not restricted to contacting the center part of the heater 30 and providing. The heater temperature sensor 12J may be disposed at an appropriate location according to the performance of the heater 30.

The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, the structure of each part of the heat storage type electric water heater, that is, the structure of the heat storage material, the heater, the heat transfer tube, the heat transfer member, the heat transfer fin, etc., is the heat storage material 20, the heater 30, the heat transfer tube 40, the heat transfer tube in this embodiment. The configuration is not limited to the heat member 50, the heat transfer fins 61, and the like. Further, for example, the heat transfer tube 40, the heat transfer member 50, and the heat transfer fin 61 are made of copper, but are not limited to copper, and are made of a material having higher thermal conductivity than the heat storage material 20, such as a metal other than copper. It only has to be configured.
Further, for example, the components in the above embodiment may be combined with each other to constitute a heat storage type electric water heater. Further, for example, the heat transfer fins 61 may be in contact with the heater 30 so as to be able to transfer heat. In this case, the heat transfer fin 61 also serves as the heat transfer member 50.

  Moreover, the piping path | route of a heat exchanger tube is not limited to the piping path | route of the heat exchanger tube in the said embodiment. The piping path of the heat transfer tube is not limited to a path that flows in from the bottom and is discharged from the top. For example, a path that flows in from the top and is discharged from the bottom may be used. But you can.

DESCRIPTION OF SYMBOLS 1, 1F, 1G, 1H, 1I, 1J ... Thermal storage type electric water heater 10 ... Main body 12J ... Heater temperature sensor 20 ... Thermal storage material 30, 30E ... Heater 40, 40D, 40F, 40G, 40H, 40I ... Heat transfer tube 50 , 50A, 50B, 50C ... Heat transfer member 61 ... Heat transfer fin 435 ... Inflow part W ... Water

Claims (6)

A heat storage material housed inside the device body;
A heater for heating the heat storage material;
A heat transfer tube that is disposed in contact with the heat storage material inside the apparatus main body, in which water flows and exchanges heat between the water and the heat storage material;
A heat storage type electric water heater comprising: a heat transfer member made of a material having higher heat conductivity than the heat storage material and in contact with the heater and the heat transfer tube so as to transfer heat.   The heat storage type electric water heater according to claim 1, wherein a contact area between the heat transfer tube and the heat storage material is larger than a contact area between the heat transfer tube and the heat transfer member.   The regenerative electric water heater according to claim 1 or 2, wherein the heater is disposed in a lower portion inside the apparatus main body.   The said heater is a part of the said heat exchanger tube located inside the said apparatus main body, Comprising: Any of the Claims 1-3 which are arrange | positioned close to the inflow part of the said heat exchanger tube into which water flows in. Thermal storage type electric water heater according to crab.   The heat transfer member is a portion of the heat transfer tube located inside the apparatus main body, and is in contact with a water inflow portion of the heat transfer tube into which water flows. The regenerative electric water heater described in 1. A heat transfer fin projecting from the outer peripheral surface of the heat transfer tube;
The heat storage type electric water heater according to any one of claims 1 to 5, wherein the heat transfer member is in contact with the heat transfer tube via the heat transfer fin so as to be capable of transferring heat.

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