JP2007255874A - Storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-profile end stop system storage type water heater equipped with a tank which is thinner in the longitudinal direction and which is strong enough for repetitive use at a working water pressure of 0.1 MPa or higher. <P>SOLUTION: A hot water tank 1 consists of a lower tank having a water supply port 22 at the bottom and an upper tank, whose openings are each formed in an elliptical shape to be stronger and less deformable than a rectangular opening so that both can be reliably welded abutting on each other independently of the existence or not of collars on the outer peripheries. An electric heater 2 and a bimetal switch 4 fixed to the hot water tank 1 are arranged to be directed to the long axis or to be located at the corners of facing cases 41, 43, and so they are free from protrusion in the longitudinal direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a small hot water heater installed in a washroom or the like, and more particularly to a thin hot water heater suitable for a place where a wheelchair or the like is used.

  In order to ensure strength, the rectangular tank of the conventional thin hot water heater has a reinforcing plate made of stainless steel so that it is parallel to the weld surface. Welding at the same time when welding. Further, in order to weld the reinforcing plate, the upper part of the tank, and the lower part of the tank at the same time, a tank-like flange is provided in the tank, and welding is performed at the flange part (see, for example, Patent Document 1).

  In the hot water storage tank as described above, the corner space in the case can be used effectively because there is a tank up to the corner when stored in a rectangular case, compared to a cylindrical tank. In addition, since the rectangular tank is low in strength, the hot water storage tank tends to swell when water pressure is applied, but deformation can be prevented by an internal reinforcing plate. For this reason, if the water pressure is about 0.05 MPa, it will not be damaged even if pressure is applied to the tank by repeated use, and in the case of a main-stop type hot water storage water heater provided with an opening / closing mechanism on the upstream side of the tank, a thin hot water storage It is possible to provide a water heater.

However, in the case of the above structure, because the tank is rectangular, the tank itself needs to have a low strength and a shape having a bowl-like flange. Therefore, there is a problem in that a reinforcing plate is required to ensure the required number of parts and the number of parts is increased due to the labor required for welding. In addition, when used in a front-end type hot water storage water heater provided with an open / close mechanism on the downstream side of the tank, since the water pressure is applied to 0.1 MPa or more, there is a problem that the tank is damaged and water leaks during repeated use. It was.
Japanese Patent Laying-Open No. 2004-324972 (FIG. 1)

  The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to have a strength that allows repeated use of a water pressure of 0.1 MPa or more for a front-end hot water storage type water heater, and a thickness in the front-rear direction. May supply a thin hot water heater with a thin tank.

  In order to achieve the above object, in the hot water storage type hot water heater according to claim 1, a hot water tank that heats and stores water by an electric heater and an electrical component that controls energization of the electric heater are housed in an outer case. In the hot water storage type hot water heater, the hot water tank is composed of a bottomed cylindrical upper tank and a lower tank, each having an elliptical opening, and the opening of the upper tank and the lower tank has a butt weld with no outer periphery. The outer case has a rectangular shape with a horizontal cross section, and is arranged so that the long axis of the elliptical shape of the hot water tank is along the horizontal direction, and the elliptical shape of the hot water tank is A flange portion for fixing the electric heater is provided on one end side of the long axis, and the flange portion is not provided on the one end side of the long shaft, and is opposed to the corner portion of the outer case. Characterized in that attached to the bimetal switch in the position that.

  Further, in the hot water storage type hot water heater according to claim 2, a water supply port for supplying water is provided on a bottom surface of the hot water tank, and the water supply port is supported on a bottom surface of the exterior case to support the hot water tank. In addition, a leg portion for supporting the hot water tank on the bottom surface of the outer case is provided at a position away from the rear long axis direction of the hot water tank.

  Further, in the hot water storage type hot water heater according to claim 3, the upper surface of the hot water tank is constituted by a curved surface protruding from the upper surface, and the hot water outlet in the hot water tank is provided at a central position which is the top of the curved surface. It is characterized by that.

According to the invention of claim 1, since the opening to be welded has an elliptical shape in the hot water tank, the strength is higher and the deformation is less than in the case of the rectangular opening. Even without it, butt welding can be surely performed. Further, since the electric heater and the bimetal switch fixed to the hot water tank are arranged so as to be located in the long axis direction or the corner portion of the outer case, they do not protrude in the front-rear direction.
Therefore, it is possible to provide a thin hot water storage type water heater while suppressing the thickness of the outer case in the front-rear direction. For example, even when the outer case is fixed to the lower wall surface of the basin, The feeling of space pressure can be reduced.

  According to the invention of claim 2, since the hot water tank is supported by the water supply port located on the bottom surface and the leg on the rear side, there is no leg on the front side of the hot water tank, Thus, the outer case can be made thinner and the outer case can be made thinner.

  According to invention of Claim 3, when the water supplied from the water supply port of the bottom face pushes out the hot water in a tank, since there is a hot water outlet at the top, hot water can be taken out to the end and the hot water time is lengthened. be able to.

Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a schematic explanatory view of a main hot water storage type hot water heater showing an embodiment of the present invention, and FIG. 2 is a construction diagram showing a set state with the basin of the present invention. As shown in FIG. 2, the hot water storage type water heater 30 is used by being fixed to the wall surface under the wash basin 25.

The internal configuration of the hot water storage hot water heater 30 will be described with reference to FIG. An electric heater 2 for heating the water in the hot water tank 1 is attached to the hot water tank 1, and the temperature of the hot water is detected by a temperature regulator 3 attached to the hot water tank 1, and a predetermined temperature is detected. Then, energization of the electric heater 2 is controlled. When the electric heater 2 is energized while the hot water tank 1 is empty or when the temperature regulator 3 fails, an overheat prevention device 4 is attached under the temperature regulator 3. ing. And it is accommodated in these exterior cases 5.
As shown in FIG. 2, a water tap 31 that automatically discharges and stops water is detected and fixed to the basin 25 by detecting the user's hand. The hand is detected by the sensor 38, and a signal is input to the controller 20 in the hot water storage hot water heater 30 through the sensor cord 37. The controller 20 outputs a signal to open the hot water solenoid valve 9. When the hot water solenoid valve 9 is opened, water is supplied from the stop cock 35 through the water supply connecting pipe 34 to the hot water storage type hot water heater 30. The hot water supply hot water heater 30 passes through a check valve 8 from a water supply elbow 6 through a filter 7, and branches from the hot water solenoid valve 9 to a water supply bypass pipe 19 and a tank water supply pipe 12. The water that has passed through the tank water supply pipe 12 is supplied from the bottom of the hot water tank 1, and hot water stored in the hot water tank 1 is pushed out and discharged from the tank hot water supply pipe 14 to the mixing valve 15. This mixing valve 15 is a thermostatic mixing valve with a built-in SMA, and the hot water that has entered the mixing valve 15 is mixed with the water coming from the feed water bypass pipe 19 to become hot water of about 36 ° C. and discharged from the hot water elbow 18. Then, hot water comes out from the tap tap 31 through the tap connecting pipe 36.

  Further, when the selector switch 39 of the tap water tap 31 is switched to the water side and the hand is pushed out, the water solenoid valve 10 opens, the water is discharged from the hot water elbow 18 through the water discharge pipe 16, and passes through the hot water connection pipe 36. Water comes out from the tap.

  Further, when the tap switch 39 of the tap tap is switched to the water side and the hand is pushed out, the solenoid valve 10 opens, the drain pipe 16 is used to drain water from the tap elbow, and the tap connection pipe is passed through the outlet. Water comes out of the water tap.

  3 is a cross-sectional view of the hot water heater according to the present invention as seen from the bottom, FIG. 4 is an explanatory view with the inner surface cover of the hot water heater according to the present invention removed, and FIG. 5 is a vertical cross section of the hot water heater according to the present invention. It is. As shown in these drawings, the hot water tank 1 includes a bottomed cylindrical upper tank 1-1 and a lower tank 1-2 each having an elliptical opening. The upper tank 1-1 and the lower tank 1 The opening of -2 is joined by butt welding that does not have wrinkles on the outer periphery (see FIG. 5). A heater flange 23 for fixing the electric heater 2 is provided on one end side of the long axis of the ellipse in the hot water tank 1, and on the side where the heater flange 23 is not provided, facing the corner portion of the inner surface case 41. The overheat prevention device 4 is attached to a position where the temperature rises.

As a result, the hot water tank 1 is welded in the upper tank 1-1 and the lower tank 1-2, each having an elliptical opening, so that it has higher strength and less deformation than the rectangular opening. Therefore, the butt welding can be surely performed even if there is no flaw on the outer periphery. Moreover, it welds from the inner side of the said hot water tank 1, the welding part 1-3 does not come out outside, and there is no convex part. Further, the electric heater 2 and the overheat prevention device 4 fixed to the hot water tank 1 are arranged so as to be positioned in the major axis direction or the corner portion of the outer case 5, so in these directions There is no protrusion.
Therefore, the thickness of the exterior case 5 in the front-rear direction can be suppressed, and a thin hot water heater 30 can be provided. For example, even when the outer case 5 is fixed to the lower wall surface of the basin 25, the basin 25 The feeling of pressure on the user's foot space can be reduced.

  Further, a tank water supply port 22 for supplying water is provided on the bottom surface of the hot water tank 1, and the tank water supply port 22 is supported on the bottom surface of the rear case 43 to support the hot water tank 1, and the hot water tank Two tank legs 21 for supporting the hot water tank 1 on the bottom surface of the back case are provided at positions separated from each other in the major axis direction on the rear side of the tank 1.

  According to this, since the tank water supply port 22 located on the bottom surface of the hot water tank 1 and the tank leg 21 on the rear surface side are supported, the tank leg 21 is formed on the front surface side of the hot water tank 1. not exist. Therefore, the distance between the inner surface panel 41 and the hot water tank 1 can be reduced, and the outer case 5 can be thinned.

  Further, as shown in FIG. 5, the upper surface of the hot water tank 1 is constituted by a curved surface protruding from the upper surface, and the hot water outlet 14a in the hot water tank 1 is provided at a central position which is the top of the curved surface.

  According to this, when the water supplied from the tank water supply port 22 on the bottom surface pushes out the hot water in the hot water tank, the hot water can be taken out to the end because the hot water outlet 14a is at the apex. Can be long.

  FIG. 6 is a schematic explanatory view of a front-end type hot water storage water heater showing another example of the present invention. In FIG. 6, an electric heater 2 for heating water in the hot water tank 1 is attached to the hot water tank 1, and the temperature of the hot water is detected by a temperature regulator 3 attached to the hot water tank 1. When the temperature reaches a predetermined temperature, the energization of the electric heater 2 is controlled. When the electric heater 2 is energized when the hot water tank 1 is empty, or when the temperature regulator 3 fails, an overtemperature protector 4 is attached under the temperature regulator. Yes. When a faucet of a hot water tap (not shown) is opened, water passes from the water supply elbow 6 through the filter 7 and is branched from the pressure reducing valve 60 to the water supply bypass pipe 19 and the tank water supply pipe 12. The water that has passed through the tank water supply pipe 12 is supplied from the bottom of the hot water tank 1, pushes out hot water, and is discharged from the tank hot water supply pipe 14 to the mixing valve 15. The hot water that has entered the mixing valve 15 is mixed with the water coming from the feed water bypass pipe 19, becomes hot water of about 36 ° C., and is discharged from the hot water elbow 18. Moreover, since the hot water in the warm water tank 1 expands during boiling, the internal pressure rises, but a relief valve 61 is installed on the upper surface of the warm water tank 1 to release the expanded pressure during boiling. .

  Normally, in the case of the original stop type, an open / close mechanism is provided on the upstream side of the hot water tank 1 so that water pressure is not directly applied to the hot water tank 1 at the time of water stop, and the water pressure is only about 0.05 MPa. However, in the case of the first stop type, since the flow of water is opened and closed downstream of the hot water tank 1, the pressure reducing valve 60 is disposed to reduce the water pressure, and the internal pressure of the hot water tank 1 is about 0.08 MPa. It becomes. Further, the water pressure in the hot water tank 1 is controlled by the relief valve 61 so as not to exceed 0.1 MPa. Therefore, in the case of the first stop type, since the water pressure is 0.1 MPa or more when repeatedly used, the strength of the tank is required to be 0.1 MPa or more repeatedly. Since the shape of the opening to be welded is an ellipse, the hot water tank 1 has higher strength and less deformation than the rectangular opening, so that it is reliable even without having a flaw on the outer periphery. Butt welding is possible. For this reason, the hot water tank 1 is not damaged even in repeated use of the leading stopper type 0.1 MPa, and it is possible to provide a thin leading stopper type hot water storage type water heater.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It is a construction drawing which shows a set state with the washbasin of this invention. It is sectional drawing seen from the bottom face of the hot water storage type water heater of this invention. It is explanatory drawing which removed the inner surface cover of the hot water storage type water heater of this invention. It is a longitudinal section of the hot water storage type water heater of the present invention. It is typical explanatory drawing of the tip-stop type hot water storage water heater which shows the other example of this invention.

Explanation of symbols

1 ... Warm water tank
1-1 ... Upper tank
1-2 ... Lower tank
2 ... Electric heater
3 ... Temperature controller
DESCRIPTION OF SYMBOLS 4 ... Overheat prevention device 5 ... Exterior case 6 ... Water supply elbow 7 ... Filter 8 ... Check valve 9 ... Outlet solenoid valve 10 ... Outlet solenoid valve 11 ... Drain plug 12 ... Tank water supply pipe 13 ... Intake valve 14 ... Tank outlet Pipe 14a ... Hot water outlet 15 ... Mixing valve 16 ... Water outlet pipe 17 ... Hot water pipe 18 ... Hot water elbow 19 ... Feed water bypass pipe 20 ... Controller 21 ... Tank leg 22 ... Tank water inlet 23 ... Heater flange 25 ... Basin 30 ... Hot water storage type Water heater 31 ... Hot water tap 34 ... Water supply connection pipe 35 ... Water stop cock 36 ... Hot water connection pipe 37 ... Sensor code 38 ... Sensor 39 ... Changeover switch 40 ... Cosmetic cover 41 ... Inner cover 42 ... Top cover 43 ... Back cover 60 ... Pressure reducing valve 61 ... Relief valve 62 ... Flood elbow

Claims (3)

In a hot water storage water heater in which a hot water tank that heats and stores water by an electric heater and an electrical component that controls energization to the electric heater are housed in an outer case,
The warm water tank is composed of a bottomed cylindrical upper tank and a lower tank, each of which has an elliptical opening, and the upper and lower tank openings are joined by butt welding that has no flanges on the outer periphery.
The outer case has a rectangular shape with a horizontal cross section, and is arranged so that the long axis of the elliptical shape of the hot water tank is along the horizontal direction,
In addition, a flange portion for fixing the electric heater is provided on one end side of the long axis of the ellipse in the hot water tank, and a bimetal is provided on the side where the flange portion is not provided and facing the corner portion of the exterior case. Hot water heater with a switch installed. A water supply port for supplying water is provided on the bottom surface of the hot water tank, the water supply port is supported on the bottom surface of the exterior case to support the hot water tank, and the rear surface side long axis direction of the hot water tank is separated. The hot water storage type water heater according to claim 1, wherein a leg portion for supporting the hot water tank on the bottom surface of the outer case is provided at a predetermined position. The hot water storage hot water according to claim 2, wherein the upper surface of the hot water tank is configured by a curved surface protruding upward, and a hot water outlet in the hot water tank is provided at a central position which is a top of the curved surface. vessel.

Images