JP5910016B2 - Electric water heater for hand washing - Google Patents

Description

  The present invention relates to a hand-washing electric water heater that preheats water discharged from a faucet (water tap).

  As a conventional electric water heater for hand-washing, two pipes extending from a heat exchanger (electric water heater for hand-washing) are connected to a bathtub, and hot water in the bathtub is placed outside the heat exchanger and between the bathtub and the heat exchanger. It is circulated in the order of the strainer, circulation pump, heat exchanger, and bathtub provided in the pipe between them, and one of the pipes is connected to the water supply (water supply source) via a stop cock (pressure reduction check valve) (For example, refer to Patent Document 1).

Japanese Patent No. 4350292

  However, in the case of Patent Document 1, since the strainer is separated from the electric water heater for washing hands, it is difficult for ordinary users to find the position of the strainer, and it is difficult to clean and maintain the strainer. Furthermore, it is difficult to perform the cleaning and maintenance of the strainer unless it is a specialist who possesses a specialized tool for opening and closing the stop cock and a specialized tool for attaching and detaching the strainer.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric water heater for hand washing in which a strainer can be easily attached and detached when a user performs cleaning and maintenance of the strainer.

The first problem-solving means of the present invention includes a water inlet for taking in water from a water supply source, a flow rate adjusting valve for adjusting a flow rate of water from the water inlet, and the flow rate adjusting valve. A strainer for filtering foreign matter in the water taken in from, a flow rate detector for detecting water flow and water stoppage of the water filtered by the strainer, and heating the water that has passed through the flow rate detector into hot water A heater, a hot water outlet that discharges hot water heated by the heater to a faucet, a control board that controls energization of the heater, the water inlet, the strainer, the flow rate detector, the heater, and the hot water outlet And a main body case having a control board, the main body case has a tapered portion on an outer periphery of the strainer, and the strainer is detachable, and the upper surface, the side surface, or the main body case is removable. Is provided on one of the front surfaces, and the outer end surface of the strainer is located on the inner surface or the same surface as the upper surface, side surface, or front surface of the main body case on which the strainer is provided, and a detachable groove portion is formed. are the thickness of the grip portion of the strainer is smaller than the depth of the tapered portion, is configured.

  Moreover, the 2nd problem-solving means of this invention is the structure by which the said groove part is the groove width which a coin engages.

  The third problem solving means of the present invention is a configuration in which the main body case has a tapered shape on an outer periphery of the strainer.

  Moreover, the 4th problem-solving means of this invention is the structure by which the outer end surface of the said strainer is located inside or the same surface with respect to the inner end surface of the said taper part.

  The electric water heater for hand-washing of the present invention has a strainer on one of the upper surface, the side surface, or the front surface of the main body case, so that even a general user can easily understand the position of the strainer. Further, since the detachable groove is formed on the strainer, the strainer can be rotated and detached using a general tool such as a flat-blade screwdriver. These make it easy for the user to attach and detach the strainer when cleaning and maintaining the strainer.

  Moreover, the electric water heater for hand-washing of this invention makes it possible for the general user to clean and maintain the strainer by using a familiar object such as a coin by setting the groove portion to have a groove width with which the coin is engaged. .

  In addition, the electric water heater for hand-washing of the present invention can use a coin having a large outer diameter (for example, a 500-yen coin) that is easy to grip and apply torque because the main body case has a tapered portion on the outer periphery of the strainer. Even general users who are weak, such as the elderly, can easily clean and maintain the strainer.

  In addition, the electric water heater for hand-washing of the present invention can further improve the design because the outer end surface of the strainer is located on the inner side or the same surface with respect to the inner end surface of the tapered portion.

It is explanatory drawing which installed the electric water heater for hand-washing under the washstand. It is a perspective view of the appearance of an electric water heater for washing hands. FIG. 3 is a view of the outer periphery of the strainer in the first embodiment. It is an internal explanatory view of the electric water heater for hand-washing in Example 1. FIG. It is an outer periphery figure of the strainer in Example 2. FIG. It is an inside explanatory view of the electric water heater for hand-washing in Example 2.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Example 1)
FIG. 1 is an explanatory diagram in which an electric water heater 1 for hand washing according to the present invention is installed under a washstand 2. Water is pumped and introduced by water pressure from a water supply 3 (water supply source) in the lower storage part 2a of the wash basin 2 to a water inlet 12a of the electric water heater 1 for hand washing through a stop cock 4. The water is heated to hot water in the electric water heater 1 for hand-washing, and hot water is sent from the tap 17a to the faucet 5 (water tap) by tap pressure. A power cord 6 and a ground cord 6a are connected to the electric water heater 1 for washing hands. A power plug 6b with a leakage breaker is connected to the power cord 6 and the ground cord 6a. The power plug 6 b with the earth leakage breaker is connected to the outlet 7 at the lower part of the wash basin 2, and supplies power to the hand-washing electric water heater 1 through the power cord 6. The ground cord 6a is connected to the ground terminal of the outlet 7 in the lower storage portion 2a. On the front surface of the design cover 8 (main body case), there is an energizing lamp 9a indicating that the power plug 6b with an earth leakage breaker is connected to the outlet 7, and a heating lamp 9b indicating that water is being heated to hot water. A display unit 9 is provided.

  The wash basin 2 can be replaced with other water places such as a kitchen sink and a bathroom wash basin. When there is no outlet 7 in the lower storage portion 2a, it is possible to supply power to the electric water heater 1 for hand washing from an outlet near the washstand 2 using an extension cord or the like.

  FIG. 2 is a perspective view of the appearance of the electric water heater 1 for washing hands. The electric water heater 1 for hand-washing has an insertion port 8a for inserting the strainer 13 into the side surface of the design cover 8 made of flame-retardant polypropylene resin, which is an outer shell of the electric water heater 1 for hand-washing. The strainer 13 is made of SUS304 and has a metal mesh 13a of about 120 mesh formed into a cylindrical shape, and the outer periphery of one end 13b of the cylindrical shape is covered with polypropylene resin, and the inside thereof serves as a water outlet 13c for filtered water. The other end 13d of the cylindrical object is entirely covered with polypropylene resin, and a grip portion 13e for holding the strainer 13 by hand is formed outside the other end 13d. The grip portion 13e is formed with a groove portion 13f into which a coin, a flat-blade screwdriver or the like can be inserted. Four reinforcing polypropylene resin beams 13h are formed between one end 13b and the other end 13d of the cylindrical object including the axial alignment surface 13g of the wire mesh 13a. The polypropylene resin and the wire mesh 13a forming the one end 13b, the other end 13d, and the beam 13h are integrally formed of polypropylene resin so as to sandwich the wire mesh 13a from the inside and the outside of the cylindrical object. Between the outer periphery of one end 13b of the cylindrical object, the entire other end 13d, and the four beams 13h, a wire mesh 13a through which water passes is exposed without being covered with polypropylene resin. A first O-ring 14 made of ethylene propylene diene rubber (EPDM rubber) is inserted at the base of the grip 13e on the wire mesh 13a side. Male threads 13i are formed on the polypropylene resin on the wire mesh 13a side of the first O-ring 14 and up to four beams 13h.

  Here, the insertion port 8 a is provided on the side surface of the design cover 8, but a configuration in which the insertion port 8 a is provided on the upper surface or front surface of the design cover 8 is also possible. Further, the design cover 8 can be made of other resin or metal plate. The mesh of the metal mesh 13a can be changed as necessary.

  FIG. 3 is an outer peripheral view of the strainer 13 in the first embodiment. A taper portion 8b (concave portion) larger than the outer diameter of the 500-yen coin is formed in the insertion port 8a formed on the outer surface of the design cover 8 so as to be recessed inward from the outer surface of the design cover 8. The groove 13f of the strainer 13 is a recess having an R shape larger than the outer diameter R of the 500 yen coin in the depth direction. The outer end surface 13j of the strainer 13 is concave or flush with the inner end surface 8c of the tapered portion 8b in a state of being inserted into the insertion port 8a of the design cover 8 and fixed.

  However, when the tapered portion 8b is not formed, the outer end surface 13j of the strainer 13 is concave with respect to the outer surface of the design cover 8 in a state where it is inserted into the insertion port 8a of the design cover 8 and fixed. Or the same side.

  The groove 13f can also be formed so as to be recessed in a rectangular shape in the depth direction.

  FIG. 4 is an internal explanatory diagram of the state in which the design cover 8 is removed from the electric water heater 1 for washing hands in the first embodiment. The electric water heater for washing hands 1 with the design cover 8 removed is provided with a base plate 11 (main body case). The base plate 11 is provided with a polypropylene flow rate adjusting valve 12 having a metal inlet 12a for taking in water from the water supply 2 (see FIG. 1). The flow rate adjusting valve 12 is formed with a strainer insertion tube 12b into which the strainer 13 is inserted. The outer end 12d of the strainer insertion tube 12b is a first O-ring receiver that compresses the first O-ring 14 in a watertight manner with the base of the grip 13e on the wire mesh 13a side when the strainer 13 is rotationally inserted and fixed. A surface 12e is formed. A female screw 12c having a diameter, a length, and a pitch corresponding to the male screw 13i of the strainer 13 is formed on the inner surface of the strainer insertion tube 12b inside the first O-ring receiving surface 12e. At the inner end 12f of the strainer insertion pipe 12b, there is formed a water outlet receiving pipe 12g that is fitted into the water outlet 13c when the strainer 13 is rotationally inserted and fixed. The water outlet receptacle 12g is provided with a second O-ring 12h that is watertightly compressed with the water outlet 13c via an O-ring groove 12i formed on the outer periphery of the water outlet receptacle 12g.

One end of the water supply hose 19 is connected to one end of the flow rate detector 15 and the other end of the water supply hose 19 is connected to the outlet pipe 12j that communicates with the outlet port receiving pipe 12g and protrudes to the outside of the strainer insertion pipe 12b. One end of the water discharge hose 20 is connected to the other end of the flow rate detector 15, and the other end is connected to one end of the heat exchange unit 16. One end of the hot water hose 21 is connected to the other end of the heat exchange unit 16, and the other end is connected to one end of the linear cylindrical tube 17. At the other end of the linear cylindrical tube 17, a hot water outlet 17 a for discharging hot water to the faucet 5 is formed. Both ends of the water supply hose 19, the water discharge hose 20, and the hot water hose 21 are prevented from coming off by hose clips 22. Inside the flow rate detector 15, a thermistor 15a for measuring the temperature of water is inserted. In the flow rate detector 15, an object to be detected (not shown) that detects water flow and water stoppage (water flow) is provided to detect water that has passed through the flow rate detector 15. This detection object can be made into the structure which detects flow volume, for example by rotating with a water flow. Inside the heat exchange unit 16, a thermistor 16a for measuring the temperature of hot water is inserted. The base plate 11 is provided with a control board 18 that detects the temperature of water flow or water stop and water or hot water and controls energization to the heat exchange unit 16. The control board 18 is provided with a power plug 6b with a leakage breaker that detects a 15 mA leakage through the power cord 6 and the ground cord 6a and turns off the power supply. A 3V regulator 18a for 5V creation and a heater ON / OFF triac installed on the control board 18 are brought into contact with the watertight metal plate 16b of the heat exchange unit 16. The output of the heat exchange unit 16 is rated at a maximum of 1240 W, the flow rate of water is a maximum of 1000 cm ³ / min, and the adjustment temperature of hot water is a maximum of 39.5 ° C.

  The position of the thermistor 15a is changed to the inside of the cylindrical inner wall at one end of the flow rate detector 15, and the position of the thermistor 16a is changed to the inside of the cylindrical inner wall at the other end of the heat exchange unit 16 as necessary. Is possible. When the maximum rating is used, the water temperature rise by the heat exchange unit 16 is about 17 ° C. Therefore, the thermistor 15a, the thermistor 16a, and the temperature control board 18 can be deleted. If necessary, it is possible to change the output of the heat exchange unit 16, the flow rate of water, and the adjusted temperature of hot water.

  Below, operation | movement of Example 1 of the electric water heater 1 for hand-washing of this invention is demonstrated.

  In the state of FIG. 4, the electric water heater 1 for hand-washing takes water from the water supply 3 from the water inlet 12 a by water pressure and introduces it into the flow rate adjustment valve 12. Water enters the strainer insertion pipe 12b formed in the flow rate adjusting valve 12, and passes from the outside to the inside of the cylindrical wire mesh 13a of the strainer 13 that is rotationally inserted and fixed in the strainer insertion pipe 12b. At this time, solid matters such as rust, sand, dust, microorganisms, and a lump of water mixed in the water are filtered and removed by the wire mesh 13a. Since all the water is watertightly connected between the water outlet 13c of the one end 13b of the strainer 13 and the water outlet receiving pipe 12g, the water always passes through the wire mesh 13a without leaking from the connecting portion. All the water leaks from the connecting portion because the polypropylene resin at the other end 13d of the strainer 13 and the first O-ring 14 are watertightly connected to the first O-ring receiving surface 12e of the strainer insertion tube 12b. It always passes through the wire mesh 13a. The water that has passed through the wire mesh 13a and whose solid matter has been removed by filtration passes through the water outlet 13c, the water outlet receptacle 12g, the water outlet 12j, the water supply hose 19, the flow rate detector 15, and the water discharge hose 20 to the heat exchange unit 16. Extruded. The water is heated by a ceramic heater (not shown) in the heat exchange unit 16 to become hot water. Hot water is extruded through the hot water outlet hose 21, the straight cylindrical tube 17, and the hot water outlet 17a to the water tap.

  When cleaning or maintaining the strainer 13, a general user turns the stop cock 4 in the CW direction (clockwise) to close the stop cock 4 and stops water flow to the electric water heater 1 for washing hands. To do. Next, the user inserts a 500 yen coin or a flathead screwdriver into the groove 13f, and rotates the strainer 13 in the CCW direction (counterclockwise direction). Along with the rotation, the strainer 13 in which the male screw 12c is formed is pushed from the inside to the outside of the strainer insertion tube 12b in which the female screw 13h is formed. When the strainer 13 is pushed out, the water outlet 13c of the strainer 13 is guided by the inner wall of the strainer insertion pipe 12b and pushed out so that the strainer insertion pipe 12b can be discharged without being subjected to stress in the radial direction. It is removed from the water inlet tube 12g. Furthermore, when the strainer 13 is pushed out, the strainer 13 comes out of the strainer insertion tube 12b. The removed strainer 13 is washed with water by the user, and the solid matter filtered outside the wire mesh 13a is washed away. The strainer 13 from which the solid material has been removed is inserted into the strainer insertion tube 12b by the user and rotated in the CW direction. Along with the rotation, the strainer 13 in which the male screw 13i is formed is further inserted from the outside to the inside of the strainer insertion tube 12b in which the female screw 12c is formed. When the strainer 13 is inserted, the water outlet 13c of the strainer 13 is inserted into the strainer insertion tube 12b without being subjected to radial stress by the strainer 13 being guided and inserted into the inner wall of the strainer insertion tube 12b. It is inserted into the water inlet tube 12g. The strainer 13 is fixed to the strainer feed pipe 12b without contacting the outer end 12d surface of the strainer insertion pipe 12b and applying an axial stress to the wire mesh 13a. Thereafter, the user turns the stop cock 4 in the CCW direction, opens the stop cock 4, and resumes water flow to the electric water heater 1 for washing hands.

  Below, the effect of Example 1 of the electric water heater 1 for hand-washing of this invention is demonstrated.

  The electric water heater 1 for hand-washing of the present invention has the strainer 13 in the main body case composed of the design cover 8 and the base plate 11 so that even a general user can easily understand the position of the strainer 13. Furthermore, since the strainer 13 has the groove portion 13f for attaching / detaching and rotating, the strainer 13 can be rotated and attached using a general tool such as a flat-blade screwdriver. As a result, even a general user can easily clean and maintain the strainer 13. Furthermore, since the electric water heater 1 for hand washing of the present invention has fewer projections on the design surface of the design cover 8 of the electric water heater 1 for hand washing, it is easy to secure a space for inserting a hand for rotating and removing the strainer 13. Furthermore, it is possible to prevent the strainer 13 from getting in the way when storing objects around the electric water heater 1 for washing hands, and preventing the hand from hitting the strainer 13 when putting in and out the objects and operating the stop cock 4. In addition, since the water faucet 4 and the electric water heater 1 for hand washing are located at a glance in the wash basin 2, even a general user can easily open and close the water faucet 4 and attach and detach the strainer 13. It becomes possible. Accordingly, it is possible to prevent the water from leaking from the outer end 12d of the strainer feed pipe 12b by removing the strainer 13 with the stop cock 4 opened. In addition, the triac (not shown) is brought into contact with the watertight metal plate 16b of the heat exchange unit 16 to cool the triac to prevent its breakage and to use the cooling heat for heating the water to save energy. It is also possible.

  Moreover, the electric water heater 1 for hand-washing of this invention makes the groove part 13f the groove width which a coin engages, and even a general user can clean and maintain the strainer 13 using a familiar thing called a coin. It becomes possible.

  Moreover, the electric water heater 1 for hand-washing of this invention uses the coin with a large outer diameter called the 500 yen coin which the design cover 8 has a taper part 8b in the outer periphery of the strainer 13, and is easy to hold | grip and apply a big torque easily. Therefore, even a general user who is weak, such as an elderly person, can easily clean and maintain the strainer 13.

(Example 2)
FIG. 5 is an outer peripheral view of the strainer 13 in the second embodiment. FIG. 6 is an internal explanatory view of the state in which the design cover 8 is removed from the electric water heater 1 for hand washing in the second embodiment.

  Compared to the first embodiment, the strainer 13 of the second embodiment has a grip portion 13e that is more than either one of the top, side, or front surfaces of the electric water heater 1 for hand washing. It is characterized by protruding outward. Furthermore, the grip part 13e is formed with an anti-slip vertical knurling 13k.

  Here, although the vertical knurling 13k is formed in the grip portion 13e, other forms of anti-slip such as a twill knurling are formed, or an anti-slip cover such as EPDM rubber is integrally formed and used instead. It is also possible. The grip portion 13e is rotated more easily by inserting a coin, a flat-blade screwdriver or the like into the groove portion 13f by a user with weak finger strength, such as an elderly person.

  Below, operation | movement of Example 2 of the electric water heater 1 for hand-washing of this invention is demonstrated.

  Compared to the first embodiment, the strainer 13 of the second embodiment is attached to and detached from the electric water heater 1 for hand washing by directly gripping and rotating the grip portion 13e with a hand. At this time, the vertical knurling 13k formed on the grip portion 13e prevents the finger from sliding on the grip portion 13e during rotation.

  Below, the effect of Example 2 of the electric water heater 1 for hand-washing of this invention is demonstrated.

  The electric water heater 1 for hand-washing of the present invention has a strainer 13 having a gripping part 13e for attaching and detaching rotation, so that even when a general user does not have a familiar tool or object such as a flat-blade screwdriver or a coin, even a general user can The strainer 13 can be cleaned and maintained using.

1 Electric water heater for hand washing 2 Washstand 3 Water supply (water supply source)
4 stopcock 5 faucet (water tap)
8 Design Cover 8a Insertion Port 11 Base Plate 12 Flow Control Valve 12a Water Inlet 12b Strainer Insertion Tube 12c Female Thread 12d Outer End 12e First O-Ring Receiving Surface 12f Inner End 12g Drainage Port Receiving Tube 12h Second O-ring 12i O-Ring Groove 12j 13 strainer 13a wire mesh 13b one end 13c water outlet 13d other end 13e gripping portion 13f groove 13g insertion portion axial alignment surface 13h beam 13i male screw 13j outer end surface 13k longitudinal knurling 14 first O-ring 15 flow rate detector 16 heat exchange unit 17 Straight cylindrical pipe 17a Tap 18 Control board

Claims (3)

A water inlet for taking water from a water supply source;
A flow rate adjusting valve for adjusting the flow rate of water from the water inlet;
A strainer which is provided in the flow rate adjusting valve and filters foreign matter in water taken from the water inlet;
A flow rate detector for detecting water flow and water stoppage of the water filtered by the strainer;
A heater that heats water that has passed through the flow rate detector into hot water;
A hot water outlet that discharges hot water heated by the heater to a water tap;
A control board for controlling energization to the heater;
A body case having the water inlet, the strainer, the flow rate detector, the heater, the hot water outlet, and the control board;
With
The main body case has a tapered portion on the outer periphery of the strainer,
The strainer is detachable, and is provided on one of the upper surface, the side surface, or the front surface of the main body case, and the outer end surface of the strainer is provided on the upper surface, the side surface, or the front surface of the main body case provided with the strainer. located inside or flush against, the groove is formed for detachable,
The thickness of the grip portion of the strainer is smaller than the depth of the tapered portion,
Electric water heater for hand washing. An electric water heater for washing hands according to claim 1,
The groove portion has a groove width with which a coin is engaged,
Electric water heater for hand washing. An electric water heater for washing hands according to claim 1 or 2 ,
An electric water heater for hand-washing, wherein an outer end surface of the strainer is positioned on the inner side or the same surface with respect to the inner end surface of the tapered portion.

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