JP4878038B2 - Electric water heater - Google Patents

Description

  The present invention relates to an electric water heater in which a water stop valve is incorporated in the middle of a steam passage of a lid.

  Generally, an electric water heater is an outer container that houses an inner container with an open upper end, a heater that heats the inner container, a discharge path that guides hot water from the inner container to the outside of the outer container, and a hinge shaft that is attached to the outer container. And a lid for opening and closing the inner container. The lid is attached to the outer lid member having a steam port that opens to the atmosphere on the upper surface, an inner lid member that forms an internal space between the outer lid member, and a lower end of the inner lid member. An inner lid member formed with a steam hole communicating with the steam hole, and a steam passage for guiding the steam from the steam hole to the steam port. The internal space formed between the outer lid member and the inner lid member is used for the lid opening / closing operation mechanism and the arrangement of the heat insulating member. The steam generated in the inner container is discharged out of the container through the steam passage. Thereby, the internal pressure rise in the inner container in the water boiling process is prevented.

  Conventionally, when the electric water heater falls, a water stop valve is incorporated in the middle of the steam passage so that the amount of water leakage to the outside does not exceed a predetermined amount. The water stop valve sits below the valve chamber provided at a position off the upper side of the steam hole and the valve hole formed on the top surface of the valve chamber when standing upright. It consists of a valve body led to. When the electric water heater falls, the valve body moves with the momentum to close the valve hole. An intermediate path of the steam passage that connects the steam hole and the inlet of the valve chamber is passed through an introduction space formed by the inner lid member and the inner lid member. The water in the introduction space is returned to the inner container. The valve chamber is located above the steam hole because, if the steam hole and the valve chamber are arranged vertically, the valve body is shaken by the steam and makes a rattling sound. This is because it is disadvantageous in that the amount of water leakage at the time of falling tends to increase and the momentum of jetting steam is difficult to be weakened due to the shortening (for example, Patent Document 1).

Japanese Patent No. 3422213

  The upper limit water level of the inner container is defined in advance. As long as the water boiling process is performed while keeping the above-mentioned upper limit water level, even if boiling water dances, it will not be immersed in the introduction space from the steam hole. When boiling occurs with the amount of water injected exceeding the upper limit water level, the boiling water may dance and flood into the introduction space. The valve chamber of the water stop valve is arranged in the introduction space in order to prevent the lid from becoming bulky. For this reason, the valve chamber provided in the low position of the introduction space may be temporarily closed due to the flooding of the introduction space. If the steam passage is blocked with water, the internal pressure in the inner container increases, and there is a risk that the water will eventually be blown off and ejected from the steam port. In order to prevent such a phenomenon, a normal method of using an electric water heater is to perform a water heating step in a state where water is poured into the inner container so as not to exceed the upper limit water level.

  However, in actuality, water is poured directly into the inner container from a tap or water is appropriately poured into the inner container with a cup, so that the amount of water injected may slightly exceed the upper limit water level for use. For this reason, the electric water heater is required to take measures so that water does not blow out from the steam port as long as the water heating step is performed within a predetermined allowable range exceeding the upper limit water level.

  For example, if the water injection amount within a predetermined allowable range exceeding the upper limit water level is used as a reference, and the space between the water surface and the inner lid member at this time is secured, the flooding of the introduction space is prevented. Becomes higher.

Moreover, it is conceivable that the inlet of the valve chamber is provided at a position as high as possible so that the inlet space is not easily blocked by water immersion. However, if the inlet of the valve chamber is raised by an amount corresponding to a predetermined allowable range, the installation space of the water stop valve becomes higher as a whole, and the lid becomes bulky.
Moreover, it is conceivable that the momentum of jetting is reduced by reaching the steam port by providing the steam port as high as possible. However, when the steam port is raised, it is not acceptable in design to raise only that part locally, and the internal space between the outer lid member and the inner lid member is unnecessarily widened in the vertical direction. As a result, the lid is bulky.
In addition, it is conceivable that by setting the capacity of the introduction space as large as possible, the water level in the introduction space is kept low, and the inlet of the valve chamber is hardly blocked by water. However, when the introduction space is expanded in the vertical direction, the lid is bulky, and when it is expanded in the horizontal direction, the outer lid member and the shoulder of the outer container are enlarged.

Further, it is conceivable to reduce the heater power in the boiling water process, thereby suppressing the dance of the boiling water surface and suppressing the amount of water in the introduction space.
However, if the heater power is reduced, the time for the water heating process becomes longer and the user is kept waiting.

  In view of the above circumstances, an object of the present invention is to allow the heater to be heated so that the heater chamber in the water heating process is not blocked by flooding while avoiding the heater power being reduced or the lid being bulky. It is to secure the amount of water injection exceeding the upper limit water level of the inner container.

  In order to solve the above-described problems, the present invention provides an outer lid member having a steam port for opening steam to the atmosphere, an inner lid member that forms an internal space between the outer lid member, and an inner container. The lid includes an inner lid member formed with a steam hole facing the steam hole, a steam passage for guiding the steam flowing in from the steam hole to the steam port, and a water stop valve incorporated in the middle of the steam passage. A water valve sits below the valve hole formed in the top surface of the valve chamber when standing upright and at the inner wall of the valve chamber when it falls down. An intermediate path of the steam passage that includes the valve body led to the valve hole and communicates the steam hole and the inlet of the valve chamber is formed in an introduction space formed by the inner lid member and the inner lid member. In the electric water heater that is passed, the intermediate path is from a dam part higher than the steam hole. Thus, it is formed by partitioning the introduction space so as to reach the inlet of the valve chamber, and has a flow path that prevents inundation of boiling water so that the downstream side of the weir portion is not blocked. Adopted.

According to the configuration of the present invention, the intermediate path that communicates between the steam hole and the inlet of the valve chamber reaches from the weir portion higher than the steam hole to the inlet of the valve chamber, and the downstream side from the weir portion is not blocked. It is a flow path that prevents inundation of boiling water. For this reason, even if boiling water dances and floods into the introduction space from the steam hole, a steam discharge path is secured until the weir part is exceeded. Therefore, by setting the difference in height between the steam hole and the weir part, it is possible to ensure an allowable water pouring amount that does not block the valve chamber of the water stop valve beyond the upper limit water level of the inner container.
In addition, since the intermediate path goes down from the weir part to the inlet of the valve chamber, compared with the case where the inundation height at the inlet of the valve chamber is set at the same height as the overflow edge of the weir part in a configuration without the weir part. Thus, the valve chamber can be provided at a low position in accordance with the descending amount from the overflow edge of the weir portion, thereby avoiding the bulkiness of the lid.
In addition, if the introduction space between the inner lid member and the inner lid member is partitioned as described above to prevent the steam passage from being blocked, it is not necessary to increase the capacity of the introduction space, and the heater power in the water heating process can be reduced. There is no need to do.

  As described above, the present invention has an allowable water pouring amount that prevents the valve chamber of the water stop valve from being blocked by flooding while avoiding reducing the heater power in the water boiling process and making the lid bulky. It can be secured above the upper limit water level of the inner container.

Each embodiment of the present invention will be described below.
In the electric water heater according to the first embodiment (hereinafter simply referred to as “first embodiment”, the same is also abbreviated in other embodiments), the intermediate path is located downstream of the dam portion in the inner container. A configuration having a reflux path for returning the water to the water is adopted.

  As the intermediate path, for example, a configuration in which the downstream side of the weir part is closed with a wall surface with respect to the introduction space and the inner container can be adopted. However, the intermediate path is upstream of the steam port and the water stop valve, and condensed water flows from the downstream side, or inundation occurs over the weir when it falls. For this reason, it is preferable to provide a drainage path downstream from the weir part. The intermediate path can be communicated with the introduction space and the inner container as long as the intermediate path is a flow path that prevents inundation of boiling water so that the downstream side of the weir portion is not blocked. In addition, as long as this is done, it is not necessary to completely prevent the inundation of boiling water through the introduction space and the communication path with the inner container.

  The intermediate passage of the first embodiment is provided with a reflux path for returning water to the inner container on the downstream side of the weir part. For this reason, it is possible to flow the water on the downstream side of the weir part from the reflux path to the inner container. The recirculation path can be configured as an appropriate flow path as long as the valve chamber is not blocked by the water flooded up the path.

  For example, if the above-described reflux path is configured to include a check valve that allows the flow from the steam passage side to the inner container side and prevents the reverse flow, the downstream side is not blocked from the weir part. Thus, it is possible to prevent inundation of boiling water.

  In addition, when the boiling water process is performed, the cause of the flooding in the introduction space is that the boiling water dances, so if the dance of boiling water is suppressed in the reflux path, the downstream side will not be blocked from the weir part. Inundation of boiling water can be prevented.

  For example, if the above-described reflux path includes a water-permeable member that attenuates the dance of boiling water in the reflux path, the inundation of boiling water can be prevented so that the downstream side of the weir portion is not blocked.

  In particular, in the second embodiment of the present invention, the reflux path is cylindrical, and the flow path cross section of the reflux path is such that the boiling water that has entered inside dances to block the downstream side of the weir part. The configuration provided is not wide.

  If the recirculation path is formed of a simple cylinder, an increase in the number of parts and a complicated assembly process can be suppressed as compared with the configuration in which the valve structure and the damping structure are provided in the recirculation path as described above. Even without a valve structure or the like, the smaller the flow path cross section of the reflux path, the harder the boiling water that enters the path dances. In order to utilize this, the cross section of the circulation path of the second embodiment of the second embodiment is provided with a width that prevents boiling water that has entered therein from dancing and blocking the downstream side of the weir portion. For this reason, 2nd Embodiment can prevent inundation of boiling water so that a downstream side may not be obstruct | occluded rather than a dam part.

  When the reflux path is formed into a cylindrical body, it is preferable to adopt a configuration in which only the upper and lower ends are opened in terms of facilitating molding and diverting general-purpose products.

  However, when the reflux path is constituted by such a cylindrical body, when the opening on the lower side of the reflux path is floating near the water surface of the inner container, the boiling water that has risen below it rises in the reflux path. It becomes easy. If the cross section of the flow path is particularly small, it is possible to stop the rise of boiling water on the inner wall of the path, but this is not preferable in view of drainage.

  Here, since the boiling water rises on the surface of the water, if the lower opening of the reflux path is immersed in water, there is no concern that the boiling water will rise in the reflux path.

  Based on the above, in the third embodiment of the present invention, the reflux path is a cylindrical shape with only the upper and lower ends opened, and the lower opening of the reflux path protrudes downward from the inner lid member. However, the structure open | released by the height below the said use upper limit water level is employ | adopted.

Since the reflux path of the third embodiment has a cylindrical shape in which only upper and lower ends are opened, boiling water does not enter from the periphery of the cylinder wall even when protruding into the inner container. When the amount of water injection exceeds the upper limit water level, the lower opening of the reflux path is immersed in water, so it is not affected by boiling water rising on the water surface. At this time, although boiling water exists in the reflux path, it is shielded from the influence of the surrounding boiling water by the cylinder wall, so that the boiling water does not almost dance in the path due to the cross-sectional area of the channel. Can be.
Therefore, in the third embodiment, while simply providing a reflux path, the boiling water entering the path spills or the boiling water rises in the reflux path and is not flooded downstream from the weir part. be able to.

  In addition, when the amount of water injected is equal to or lower than the upper limit water level, a difference in height is secured between the introduction space and the water surface of the inner container so that the steam passage passed through the introduction space is not blocked by boiling water in the first place. The problem of inundation through the reflux route does not occur.

  The reflux path communicating with the inner container becomes a new heat transfer path to the lid side. In an electric water heater, it is preferable to avoid thermal loss from the inner container as much as possible in order to save energy. For this reason, it is preferable that the reflux path is made of a synthetic resin that is inferior in thermal conductivity as compared with a metal. The partition for forming the steam passage in the introduction space is preferably made of a synthetic resin because it is continuous with the reflux path.

  In light of the above, the fourth embodiment of the present invention employs a configuration in which a partition forming the intermediate path and the reflux path are provided with a synthetic resin flow dividing member integrally molded. .

  If each of the reflux path and the partition is made of a synthetic resin, it can be provided in one part (a flow dividing member) by integral injection molding.

  The fourth embodiment can suppress the above-described thermal loss through the reflux path, and can suppress an increase in the number of parts and the number of parts assembled as compared with a configuration in which the reflux path is separately provided.

  Since the flow dividing member partitions the introduction space formed by the inner lid member and the inner lid member, it can be attached to the inner lid member or the inner lid member.

  5th Embodiment of this invention employ | adopts the structure by which the said flow dividing member is mounted | worn with the said inner cover member, and is provided so that it may not contact with the upper-plate surface of the said inner cover member.

  If the flow dividing member is attached to the inner lid member, it is possible to avoid the attachment with the inner lid member facing the inner container and not to contact the upper plate surface of the inner lid member. For this reason, in the fifth embodiment, heat transfer is less likely to occur between the inner lid member and the flow dividing member as compared with the configuration in which the flow dividing member is mounted on the upper plate surface of the inner lid member, and the heat from the inner container is reduced. It is possible to relatively prevent the mechanical loss.

Hereinafter, an electric water heater according to Embodiment 1 of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the electric water heater according to the first embodiment guides hot water from the inner container 11 to the outside of the outer container 12, the outer container 12 that houses the inner container 11 having an open upper end, the heater 13 that heats the inner container, and the outer container 12. A discharge path 14 and a lid 20 that opens and closes the inner container 11 around a hinge shaft attached to an end of the outer container 12 on one end side of the shoulder 12a are provided. Hereinafter, one end of the shoulder portion of the outer container is the rear side, and the vertical direction is the vertical direction when the electric water heater is upright unless otherwise noted.

  As shown in FIGS. 1 to 3, the shoulder portion 12 a of the outer container 12 constitutes the upper end portion of the outer container 12, and is vertically butted against a body portion 12 b provided separately. The shoulder 12a of the outer container 12 has a nose protruding forward from the trunk 12b. An operation input unit for causing the nose of the shoulder portion 12a to perform a control input operation of the electric water heater is provided. The nose of the shoulder 12a has a space opened up and down, and a substrate holding member 16 provided with a circuit board 15a, a switch 15b and the like constituting the operation input unit on the upper end side is attached to the space. A water stop valve and a discharge port of the discharge path 14 are arranged below the substrate holding member 16. The water stop valve of the discharge path 14 is for preventing the amount of water leaking from the discharge path 14 to outside the apparatus when it falls, and when the electric water heater falls, the valve case 14a is momentum. The inner valve body moves to close the valve hole. The discharge port of the discharge path 14 is provided integrally with the valve case 14a.

  The nose of the shoulder portion 12a is turned upside down, and after attaching the substrate holding member 16 and the valve case 14a, the nose lower plate 17 is attached. As shown in FIGS. 1, 3, and 4, at the rear end portion of the nose lower plate 17, a fitting recess 17 a that abuts the upper end of the body portion of the outer container 12 vertically and a rear end wall of the fitting recess 17 a A vertical wall 17b extending upward from the vertical wall 17b and an open portion 17c vacated between the vertical wall 17b and the left and right ends of the fitting recess 17a are formed. Considering the state in which the nose lower plate 17 is attached to the nose of the outer container 12, as shown in the figure, substantially the entire portion excluding the lead wire clamp portion of the substrate holding member 16 is covered with the nose lower plate 17 and the valve case 14a. It is. Moreover, the edge part of the open part 17c overlaps with the valve case 14a up and down. The vertical wall 17b is abutted vertically with the rear end portion of the substrate holding member 16 on the rear side of the sealing surface S1 between the substrate holding member 16 and the shoulder 12a of the outer container 12. Thereafter, when the body 12b of the outer container 12 is abutted against the shoulder 12a, the upper end of the front wall of the body is fitted into the fitting recess 17a and the inside of the nose excluding the discharge port of the valve case 14a is hidden. .

  Here, the electric water heater may be mishandled such that the sink is filled with water and the bottom is immersed in water for cleaning. When cleaning is performed in this manner, water is immersed in the inner bottom of the water heater body, and water droplets adhere to the bottom of the outer container 12 and the outer surface of the trunk. After taking out from the sink, if the electric water heater is turned upside down to dry it, the water or water droplets will flow down. At this time, water droplets flowing down the outer surface of the front wall of the body portion of the outer container 12 and reaching the fitting recess 17a of the nose lower plate 17 can be drained to the left and right sides by the groove shape of the fitting recess 17a. The water droplets that reach the edge of the open portion 17c flow down to the valve case 14a of the water stop valve, and are transmitted to the valve case 14a of the water stop valve that overlaps the edge of the open portion 17c. The water droplets hardly flow to the substrate holding member 16 because the substrate holding member 16 is located below and in front of the valve case 14a. Inundation of the inner bottom portion of the outer container 12 may flow down the inner surface of the front wall of the trunk of the outer container 12 and may be transmitted from the rear end wall of the fitting recess 17a to the vertical wall 17b. Even if a water droplet flows down from the vertical wall 17b to the substrate holding member 16, the vertical wall 17b is abutted against the rear end portion of the substrate holding member 16, so that the water droplet easily flows to the rear side of the substrate holding member 16. It is difficult to flow to the front side where the charging unit on the holding member 16 exists. Further, the water droplets flowing to the rear side of the substrate holding member 16 can be transmitted to the lower side of the substrate holding member 16. The water droplets are unlikely to flow to the seal surface S1 because the butted position of the vertical wall 17b and the substrate holding member 16 is behind the seal surface S1. In this way, if it is difficult for the water droplets to flow into the charging portion of the substrate holding member 16 when the nose lower plate 17 and the valve case 14a of the water stop valve are turned upside down, it is possible to add a work process and a seal part without adding a work process. The failure due to the mishandling can be prevented.

  As shown in FIGS. 1, 5, and 6, the lid 20 has an inner space 23 between an outer lid member 22 in which a steam port 21 that is open to the atmosphere is disposed on the upper surface, and the outer lid member 22. An inner lid member 24 that forms a steam hole 25 facing the inner container 11, a steam passage 27 that guides the steam that flows in from the steam hole 25 to the steam port 21, The water stop valve 28 incorporated in the middle is provided.

  The internal space 23 is used for arrangement of a lid opening / closing operation mechanism and a heat insulating member. The steam generated in the inner container 11 is discharged to the outside through the steam passage 27. Thereby, the pressure rise in the inner container 11 in the boiling process is prevented.

In general, the inner lid member 26 is made of metal in consideration of the high temperature facing the inner container 11 and is formed by using a metal plate particularly in consideration of formability. Further, the outer lid member 22 and the inner lid member 24 used for installing the lid opening / closing operation mechanism and the heat insulating member are injection molded products of a synthetic resin in consideration of moldability of a complicated shape, thermal conductivity, and the like. ing.

  The water stop valve 28 includes valve chambers 28a and 28a provided at positions deviated from above the steam hole 25, and lower and larger valve holes 28b and 28c formed on the top surfaces of the valve chambers 28a and 28a when erecting. And valve bodies 28d and 28d guided to the large and small valve holes 28b and 28c on the inner wall of the valve chamber 28a when the vehicle falls over. When the electric water heater falls, the valve bodies 28d and 28d move with the momentum to close the valve holes 28b and 28c. Because of the large and small valve holes 28b and 28c, the pressure relief between the one valve chamber 28a and the other valve chamber 28a is different. Thereby, both valve bodies 28d and 28d rise reliably. In addition, the water stop valve 28 is not limited to the thing provided with multiple valve bodies etc., The form of a valve body is not specifically limited, such as spherical shape and truncated cone shape.

  The valve chambers 28a and 28a are formed by guide portions of the valve bodies 28d and 28d formed in the inner lid member 24 and a valve cap member in which the valve holes 28b and 28c are formed. It is possible to sit from above the inner lid member 24. Above the valve holes 28b and 28c, the steam port 21 is covered with a steam port cap formed on the upper surface. When the outer lid member 22 is covered from above the inner lid member 24, the steam port 21 is disposed on the upper surface of the outer lid member 22. It is also possible to form the valve chambers 28 a and 28 a in the outer lid member 22 by serving as the steam port 21 and the valve holes 28 b and 28 c.

  An intermediate path of the steam passage 27 that communicates the valve holes 28b and 28c with the inlets 28e and 28e of the valve chambers 28a and 28a is passed through an introduction space 29 formed by the inner lid member 26 and the inner lid member 24. . The water in the introduction space 29 is returned to the inner container 11.

  The steam hole 25 includes an opening vacated in the inner lid member 26. The steam holes 25 are provided at a plurality of locations. A group of vapor holes 25 are formed in a wall portion where the inner lid member 26 is partially bulged. Since the position of the group of steam holes 25 is increased, the immersion of boiling water is prevented. Further, since the inner lid member 26 is kept in a partial bulge, the capacity reduction of the internal space 23 can be suppressed. The group of vapor holes 25 are mostly blocked by the valve body 25a in order to reduce heat transfer from the inner container 11 during the heat retaining process (the state shown in FIG. 1). When boiling begins in the boiling water process and the inside of the inner container 11 reaches a predetermined pressure or higher, the valve body 25a rises from the position shown in the figure, and the group of vapor holes 25 are fully opened. A plurality of vapor holes (not shown) are formed along the outer periphery of the inner lid member 26. The inundation from the group of steam holes 25 tends to be drained from the steam holes on the outer peripheral side down the bulging portion.

  As for the inner container 11, the use upper limit water level is prescribed | regulated previously, and it is displayed by the stamp 11a on the inner periphery. As long as the water boiling process is performed with the amount of water injected below the use upper limit water level, even if the valve body 25a rises, it does not flood into the introduction space 29 from all the steam holes 25.

  As shown by the chain line in FIG. 1, the intermediate path of the steam passage 27 is an introduction space so as to reach the inlets 28e and 28e of the valve chambers 28a and 28a from the weir portion 31 higher than all the steam holes 25. It consists of an upper separation flow path in which 29 is divided into two upper and lower layers.

  As shown in FIGS. 1, 7, and 8, the intermediate path of the steam passage 27 includes a reflux path 32 that returns water to the inner container 11 on the downstream side of the weir portion 31. The reflux path 32 has a cylindrical shape in which only upper and lower ends are opened.

  The partition composed of the weir portion 31 and the bottom plate portion 33 and the reflux path 32 are integrated injection molded products made of synthetic resin. The flow dividing member 30 is attached to the inner lid member 24. In this mounted state, the flow dividing member 30 divides the dam portion 31 and the inlets 28e, 28e of the valve chambers 28a, 28a into upper and lower two layers, and an intermediate path of the steam passage 27 passing through the upper layer side is formed. The lower end of the flow dividing member 30 and the upper plate surface of the inner lid member 26 are not in contact with each other, and the space on the lower layer side is used for heat insulation between the members 26 and 30. Accordingly, the valve chambers 28 a and 28 a communicating with the intermediate path of the steam passage 27 are also provided so as not to contact the upper plate surface of the inner lid member 26.

  The height of the weir 31 may overflow even if the boiling water dances and the water enters the introduction space 29 from the steam hole 25 when the water boiling step WL2 is performed with the water injection amount WL2 exceeding the upper limit water level WL1. It is set not to. That is, the height difference H1 between the steam hole 25 and the dam portion 31 is preferably set to be higher than the height difference between WL2 and WL1 because boiling water does not enter the introduction space 29 at the use upper limit water level WL1. Here, the height difference H1 is determined so that the head of the steam passage 27 is increased upstream of the inlets 28e and 28e of the valve chambers 28a and 28a, the portion at the highest position of all the steam holes 25, and the weir This is a difference in height from the lowest part of the overflow edge of the part 31.

  The dam portion 31 is located at a position deviating from the lower side of the path connecting the steam port 21 and the valve holes 28b and 28c. For this reason, by using the internal space 23 above the weir 31, the flow path cross section of the intermediate path of the steam path 27 can be expanded without making the outer lid member 22 bulky. That is, the intermediate path of the steam passage 27 bypasses the dam portion 31 upward, and a flow path cross section is secured at the dam portion 31 by this detour. In addition, this detour also acts to change the flow of steam downwards before and after the weir 31, so that the steam force reaching the valve chambers 28 a, 28 a is weakened, or moisture mixed in the steam adheres to the lower surface of the inner wall of the path Contribute to letting This detour is formed by a downward opening 24a in which the inner lid member 24 is partially bulged upward. This is to avoid an increase in the number of parts, and a bypass can be provided by another member attached to the inner lid member 24.

  Of the intermediate path of the steam passage 27, the downstream part of the weir part 31 including the reflux path 32 prevents inundation of boiling water so that it is not clogged with boiling water when the boiling water process is performed with the water injection amount WL <b> 2. It is a flow path.

  Specifically, the flow dividing member 30 and the inner lid member 24 are inlay fitted in which the mating portions that form the space of the steam passage 27 are vertically butted. Thereby, without providing a seal member, the intrusion of water entering the introduction space 29 is prevented from entering the downstream side of the weir portion 31 from the mating portion so as to obtain the above-described blocking prevention. In addition, although the flow dividing member 30 is fastened up and down with the inner lid member 24 by screws, other fixing means such as adhesion, fusion, and press fitting can be appropriately employed.

  In addition, the dam part 31 is formed in the taper shape which inclines with respect to an up-down direction. This is to provide a spigot fitting portion that butts up and down at a portion downstream of the overflow edge of the dam portion 31.

  Further, the lower opening of the circulation path 32 is located at a position protruding downward from the inner lid member 26, and is opened at the height of the use upper limit water level WL1. Even if the boiling water rises on the surface of the water, the lower opening is immersed in the water, so that the boiling water does not rise in the reflux path 32. The reason why the upper limit water level WL1 is kept high is to prevent the reflux path 32 from becoming redundant, and the lower opening can be provided at a lower position.

  The inner diameter of the circulation path 32 is 15 mm. According to the flow path cross section of the reflux path 32 having the inner diameter, the boiling water entering the inside hardly dances and does not overflow on the bottom plate portion 33 where the upper opening of the circulation path 32 is vacant. For this reason, the above-described blocking prevention can be obtained.

  According to the first embodiment having the above-described configuration, the weir 31 having a overflow edge higher than all the steam holes 25 reaches the inlets 28e and 28e of the valve chambers 28a and 28a and includes the reflux path 32. In order to provide an intermediate path of the steam passage 27 that prevents inundation of boiling water so that the downstream side is not blocked further, when the boiling water process is performed with a water injection amount exceeding the upper limit water level WL1 and not exceeding WL2, Even if it dances and the water is introduced into the introduction space 29 from the steam hole 25, the dam portion 31 is not exceeded, and a steam discharge path indicated by a one-dotted arrow line in FIG. 1 is secured. Therefore, in the first embodiment, it is possible to secure the allowable boiling water injection amount WL <b> 2 beyond the use upper limit water level WL <b> 1 of the inner container 11 so that the valve chambers 28 a and 28 a of the water stop valve are not blocked by the flooding.

  In the first embodiment, the intermediate path of the steam passage 27 descends from the weir 31 and reaches the inlets 28e and 28e of the valve chambers 28a and 28a, so that the valve chambers 28a and 28a are lowered from the overflow edge of the weir 31. Therefore, the cover 20 can be prevented from being bulky.

  In the first embodiment, since the introduction space 29 between the inner lid member 26 and the inner lid member 24 is partitioned to prevent the steam passage 27 from being blocked, it is not necessary to increase the capacity of the introduction space 29, and in the water heating process. There is no need to reduce the power of the heater 13. As long as the water level in the introduction space 29 does not exceed the weir 31, there is no concern that the infiltration into the steam passage 27 proceeds. Since the water in the introduction space 29 is drained from the steam hole 25 before exceeding the weir 31, it is not particularly necessary to increase the capacity of the introduction space 29.

  Moreover, since the reflux path 32 of Example 1 is a simple cylinder without a valve structure or a structure for damping boiling water, the increase in the number of parts and the complexity of the assembly process can be suppressed.

  Further, in the first embodiment, since the reflux path 32 has a cylindrical shape with both upper and lower ends open, there is no undercut when the vertical direction is the die cutting direction, and the injection of the reflux path 32 is easy.

  Further, in the first embodiment, not only the reflux path 32 but also the dam portion 31 and the bottom plate portion 33 have no undercut when the vertical direction is the die cutting direction, and these can be integrally injection molded. Moreover, since the inlay fitting which butt | matches up and down with the inner cover member 24 was employ | adopted, an inlay fitting part does not become an undercut. Since Example 1 includes such a synthetic resin flow dividing member 30, thermal loss from the inner container 11 that has passed through the reflux path 32 can be suppressed, compared with a configuration in which the reflux path 32 and the like are provided separately. Thus, the increase in the number of parts and the number of parts assembled can be suppressed.

  Further, the lower end of the flow dividing member 30 attached to the inner lid member 24 does not contact the upper plate surface of the inner lid member 26. For this reason, in Example 1, compared with the case where the flow dividing member 30 is mounted on the upper plate surface of the inner lid member 26, heat transfer is less likely to occur between the inner lid member 26 and the flow dividing member 30. Thermal loss from the inner container 11 can be prevented. The outer periphery of the reflux path 32 and the inner lid member 26 may be in contact or non-contact. This is because the plate thickness of the inner lid member 26 is thin, and even if it is brought into contact, a large heat transfer path does not occur.

  In the first embodiment, the inlets 28e and 28e of the valve chambers 28a and 28a are higher than the opening on the upper side of the circulation path 32 on the upstream side. When there is water from the upper opening, the height difference between the upper opening and the inlets 28e, 28e prevents the water from blocking. This height difference is provided by the thickness of the inner lid member 24 by utilizing the use of the inlay fitting between the bottom plate portion 33 of the flow dividing member 30 and the inner lid member 24. If there is no such purpose, the valve body seating portions of the valve chambers 28a and 28a can be formed on the flow dividing member 30 at the same level as the bottom plate portion 33, and the valve chambers 28a and 28a can be provided lower.

  Moreover, although the overflow edge of the dam part 31 of Example 1 was formed on one side of the highest point, the overflow edge can also be formed in a grid shape for the purpose of steam rectification.

  Moreover, the height of the overflow edge of the dam portion 31 can be set to an appropriate height as long as the allowable boiling water injection amount can be secured and the lid 20 is not bulky. As an example, Example 2 is shown in FIG.

  As shown in the drawing, the weir portion of the flow dividing member 30 ′ of the second embodiment has an extension 34 upward from the weir portion 31 of the first embodiment. The water stop valve 28 is located behind the weir portion of the flow dividing member 30 '. The diversion member 30 ′ does not have a return path, and there is no path for water to be submerged from the inner container on the downstream side of the weir when it falls. For this reason, when the electric water heater falls backward as shown in the figure, the dam portion of the flow dividing member 30 ′ can provide a margin for the time and inclination angle until the water flows into the valve chambers 28 a, 28 a. Even if the electric water heater is tilted, a predetermined tilt angle and time are required until the valve bodies 28d and 28d block the valve holes 28b and 28c. Therefore, there is a margin until the valve holes 28b and 28c are blocked by the weir portion of the flow dividing member 30 ′. If this is obtained, it is advantageous for preventing water leakage outside the lid. The height of the overflow edge of the weir portion of the flow dividing member 30 ′ is higher than the height of the valve holes 28b and 28c by H2, and closes the valve holes 28b and 28c as shown by a two-dot chain line in the drawing. There is no possibility that the inundation will exceed the weir portion of the flow dividing member 30 ′ before.

The longitudinal cross-sectional view which showed the electric water heater which concerns on Example 1 of this invention with the cut surface of the II line drawn in FIG. 1 is an exploded perspective view of the nose of the outer container of FIG. The bottom view which shows the state which attached the nose lower board of FIG. 1 is a perspective view showing the lower nose plate of FIG. 1 from the front left oblique upper side, b is a perspective view showing the lower nose plate of FIG. 1 from the lower left front oblique direction, and c is the lower nose plate of FIG. Perspective view 1 is an exploded perspective view of the water stop valve of FIG. Partial longitudinal sectional front view showing the water stop valve of FIG. 1 from the front 1 is an exploded perspective view of the flow dividing member of FIG. 1, and b is a perspective view showing a state where the flow dividing member is attached to the inner lid member from the state of a. a is a partial bottom view showing the diversion member of FIG. 7 (b) from below, b is a partial front view of the weir portion of FIG. 7 (b) on the right half in the drawing, and the water stop valve is on the other half. Partial half-section showing the longitudinal front The fragmentary sectional view which shows the effect | action of the dam part of Example 2 of this invention

Explanation of symbols

11 Inner container 11a Mark 12 Outer container 12a Shoulder 12b Body 13 Heater 14 Discharge path 14a Valve case 15a Circuit board 15b Switch 16 Substrate holding member 17 Nose lower plate 17a Fitting recess 17b Vertical wall 17c Opening part 20 Lid 21 Steam port 22 outer lid member 23 internal space 24 middle lid member 24a downward opening 25 steam hole 25a valve body 26 inner lid member 27 steam passage 28 water stop valve 28a valve chamber 28b, 28c valve hole 28d valve body 29 introduction space 30, 30 ' Dividing member 31 Weir part 32 Return path 33 Bottom plate part 34 Extension part

Claims (6)

  An outer lid member in which a steam port for releasing steam to the atmosphere is disposed on the upper surface, an inner lid member that forms an internal space between the outer lid member, and an inner lid member that has a steam hole facing the inner container And a steam passage that guides the steam flowing in from the steam hole to the steam port, and a water stop valve incorporated in the middle of the steam passage, and the water stop valve is located at a position off the upper side of the steam hole. And a valve body that sits below a valve hole formed in the top surface of the valve chamber when standing upright, and is led to the valve hole on the inner wall of the valve chamber when falling, In an electric water heater in which an intermediate path of the steam passage for communicating a steam hole and an inlet of the valve chamber is passed through an introduction space formed by the inner lid member and the inner lid member, the intermediate path is The introduction so as to reach the inlet of the valve chamber from a dam part higher than the steam hole During are formed by partitioning the and electric kettle, characterized in that the downstream side is the flow path to prevent the flooding of boiling water so as not to be occluded than its weir.   The electric water heater according to claim 1, wherein the intermediate path includes a reflux path for returning water to the inner container on the downstream side of the weir portion.   3. The reflux path is cylindrical, and the flow path cross section of the reflux path is provided in such a width that the boiling water that has entered therein does not block and block the downstream side of the weir part. Electric water heater as described in.   The reflux path has a cylindrical shape in which only upper and lower ends are opened, and an opening on the lower side of the circulation path protruding downward from the inner lid member is opened at a height equal to or lower than a use upper limit water level of the inner container. The electric water heater according to claim 3.   The electric water heater according to claim 3 or 4, further comprising a synthetic resin flow dividing member in which the partition forming the intermediate path and the reflux path are integrally injection-molded.   The electric water heater according to claim 5, wherein the flow dividing member is attached to the inner lid member and is provided so as not to contact an upper plate surface of the inner lid member.

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