JP3981941B2 - Electric water heater - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an electric hot water supply in which hot water in an electric water heater tank heated by an electric heater is mixed with tap water by a mixing valve and controlled to a predetermined hot water, and this hot water is automatically supplied to a bathtub or currant. Relates to the device.
[0002]
[Prior art]
A conventional electric water heater is shown in FIG. 6 , which is an overall configuration diagram of the electric water heater.
Reference numeral 1 denotes an electric water heater tank. When the valve 2 is opened, the tap water is decompressed to 1.5 kg / cm ² , for example, by the pressure reducing valve 3, and the decompressed tap water is supplied into the electric water heater tank 1. Is done. The tap water flowing into the electric water heater tank 1 is heated by an electric heater disposed in the electric water heater tank 1 to become, for example, high-temperature water of 90 ° C. This hot water is supplied to the outside through the hot water channel 4. To do.
The tank capacity of the electric water heater tank 1 is selected and determined.
Further, the outer periphery of the electric water heater tank 1 is covered with a protective package K.
Reference numeral 5 denotes a first mixing valve, and a wax valve and a motor for operating a reciprocating valve body for controlling the opening of the flow path while the cold water inflow path 5B, the hot water inflow path 5C, and the mixed hot water path 5D are opened in the valve body 5A. Is provided.
The first mixing valve 5 mixes the hot water flowing in from the hot water inflow passage 5C and the tap water flowing in from the cold water inflow passage 5B, and causes the hot water controlled to an arbitrary temperature to flow out from the mixing hot water passage 5D.
Reference numeral 6 denotes a hot water solenoid valve, which has an inflow path 6B and an outflow path 6C in the valve body 6A, and includes a pilot solenoid valve, a flow sensor, a check valve, a vacuum breaker, etc., and a signal input to the pilot solenoid valve Accordingly, the supply and stop of the hot water flowing out from the outflow passage 6C are controlled.
Reference numeral 7 denotes a hot water supply path, the downstream end of which opens into the bathtub 8, and a heater 9 is surrounded on the outer periphery of the hot water supply path 7. When the heater 9 is energized, the hot water supply path 7 is heated, and the hot water flowing through the hot water supply path 7 is heated.
In the above configuration, the electric water heater tank 1 and the hot water inflow passage 5C of the first mixing valve 5 are connected by the hot water passage 4, and the cold water inflow passage 5B of the first mixing valve 5 is connected to the flow passage downstream of the pressure reducing valve 3. Connected by the tap water flow path 10, the mixed hot water path 5D of the first mixing valve 5 is connected to the hot water supply electromagnetic valve 6 and the inflow path 6B. The outflow path 6C of the hot water solenoid valve 6 is connected to the hot water supply path 7, and the lower end of the hot water supply path 7 opens into the bathtub 8.
The above is bath hot water supply means for supplying or stopping hot water controlled to a predetermined temperature toward the bathtub 8 according to the purpose of use.
[0003]
P is a pump that performs a pumping action by the rotation of the motor M, and the pump P has a first flow path P1 and a second flow path P2. In the pump P, the blades in the pump rotate to form a pump action, and the fluid is pressurized from the second flow path P2 toward the first flow path P1 and discharged. Note that the flow of fluid from the first flow path P1 to the second flow path P2 is allowed when the pump P is not operating.
Reference numeral 12 denotes a switching two-way valve including a motor, a speed reducer, and a ball valve, and includes a pressure sensor 13. The first flow path P1 of the pump P is connected to the hot water supply path 7 upstream of the heater 9 by the first bath return path 14A, and the second flow path P2 of the pump P is the first of the switching two-way valve 12. The second bath return passage 14B is connected to the flow passage 12A, and the second flow passage 12B of the switching two-way valve 12 is connected to the bathtub 8 through the third bath return passage 14C and opens.
That is, the bath return passage 14 is constituted by the first, second, and third bath return passages 14A, 14B, and 14C.
As described above, the hot water in the bathtub 8 is circulated from the bath return passage 14 toward the hot water supply passage 7 by the pumping action of the pump P, and the hot water flowing in the hot water supply passage 7 is raised to a predetermined temperature by the heater 9. This is a reheating means for supplying the hot water again into the bathtub 8 to raise the temperature in the bathtub 8 to a predetermined temperature.
The bath automatic hot water supply unit A is formed by the bath hot water supply means and the reheating means.
[0004]
15 is a second mixing valve, and a wax valve that operates a reciprocating valve body that controls the opening of the flow path while the cold water inflow path 15B, the hot water inflow path 15C, and the mixed hot water path 15D are opened in the valve body 15A; A motor is provided.
The hot water inflow passage 15C is connected to the hot water passage 4 connecting the first mixing valve 5 and the electric water heater tank 1 via the second hot water passage 4A, and the cold water inflow passage 15B is connected to the tap water flow passage 10 and the second water passage. Connected by the tap water flow path 10A, the mixed hot water path 15D is connected by the currant 16 and the second hot water supply path 7A.
The above is the general hot water supply means for supplying the hot water controlled to a predetermined temperature toward the currant 16 and forms the general automatic hot water supply unit B.
[0005]
[Problems to be solved by the invention]
According to such a conventional electric water heater, the first mixing valve 5, the hot water solenoid valve 6, the heater 9 and the pump P including the motor M and the switching two-way valve 12 constituting the bath automatic hot water supply unit A are prepared separately . They are fixed by fastening means such as screw tightening through a mounting stay toward a fixing portion such as an electric water heater tank or an outer wall of a house.
And after each said structure adheres to a fixing | fixed part, each structure is pipe-connected.
Further, even in the second mixing valve 15 constituting the general automatic hot water supply unit B, it is fixedly arranged on a fixing part such as the electric water heater tank 1 with a fastening means through an attachment stay in the same manner as described above, and then connected to a pipe. .
[0006]
According to the above, since each component is fixed to the fixed part by the fastening means via the mounting stay, first, the fixing part such as the electric water heater tank and the outer wall is selected and specified in the fixing work. Need to be fixed.
According to the above, the fixing conditions are different for each work, and fixing work of each configuration requires not only a great number of man-hours but also extremely difficult.
For example, it is necessary to prepare multiple types of mounting stays that connect the fixed part and each component, and because the fixing position of each component varies depending on the construction, the pipe length and pipe shape also change, making it impossible to share parts . Thus, it is not preferable to require a large number of man-hours for fixing work and to prepare a plurality of parts because construction days are increased and costs are increased.
In addition, the bath automatic hot water supply unit A and the general automatic hot water supply unit B need to be checked for their operation after the completion of the unit assembly. This operation check can be performed only after all the installation is completed at the construction site. .
If a defect occurs, there is a risk that the inspection of the cause and countermeasures cannot be immediately implemented because sufficient inspection equipment cannot be prepared at the site.
In addition, the components constituting the bath automatic hot water supply unit A and the general automatic hot water supply unit B are appropriately fixed to the electric water heater tank 1 or the like, and the mounting position thereof is not specified. The protective package K covering the tank 1 may interfere with the components.
[0007]
The electric hot water supply apparatus according to the present invention is made in view of the above problems, and improves the mounting workability of each component constituting the electric hot water supply apparatus and the pipes connecting them, and makes the mounting means common and the entire apparatus. To reduce the manufacturing cost of And improve the quality of the equipment and improve maintainability. An object of the present invention is to provide an electric hot water supply device that can be used.
[0008]
[Means for solving the problems]
In order to achieve the above object, the electric water heater according to the present invention uses hot water in an electric water heater tank heated by electricity,
Bath hot water supply means for controlling to predetermined hot water by mixing with tap water at the first mixing valve, and supplying this hot water to the bathtub via the hot water solenoid valve and hot water supply path;
Hot water in the bathtub is sucked into the pump through a bath return passage by a switching two-way valve and a pump driven by a motor, and the hot water discharged from the pump is heated to a predetermined temperature by a heater surrounding the hot water supply path. Reheating means for heating to the bathtub and supplying it to the bathtub from the hot water supply channel again;
A protective package disposed on an outer periphery of the electric water heater tank and surrounding the electric water heater tank;
In an electric water heater comprising:
A base member formed of a metal plate, a horizontal plate portion, a vertical plate portion,
The side plate portion extending sideward from the upper side of the vertical plate portion is formed by bending,
A pump driven by a motor and having a first flow path and a second flow path open upward is fixedly disposed on the horizontal plate portion, and a motor and a ball are disposed on the horizontal plate portion on the right side of the pump. A switching two-way valve having a valve, a pressure sensor and opening the first flow path upward is fixedly arranged,
In addition, the vertical plate portion constitutes a part of the hot water supply path, and the vertical portion around which the heater is surrounded is fixedly arranged,
In addition, a wax valve, a first mixing valve equipped with a motor, and a hot water solenoid valve equipped with a pilot solenoid valve, a flow sensor, and a check valve are fixedly arranged on the side plate portion,
The second flow path of the pump and the first flow path of the switching two-way valve are connected by a U-shaped bath return passage, and the first flow path of the pump and the vertical part are formed in a U shape. The base member is housed and arranged in a space formed between the electric water heater tank and the protective package.
[0009]
【Example】
Hereinafter, an embodiment of the electric water heater according to the present invention will be described.
FIG. 1 is a configuration diagram showing the configuration of the automatic bath water heater unit A, in which a bathtub, an electric water heater tank, and a protective package are omitted.
In addition, the same code | symbol is used about the same component as FIG.
E is a base member for fixing and fixing each component constituting the electric water heater and the pipes connecting them, and the base member E in this example is a horizontal plate portion EA formed in the horizontal direction, and a horizontal plate A vertical plate portion EB extending upward from the portion EA and a side plate portion EC extending sideward from the vertical plate portion EB are formed by bending a metal plate.
The mounting leg MA integrally disposed below the motor M is screwed onto the horizontal plate EA of the base member E via the grommet 20 made of an elastic body. At this time, the first flow path P1 and the first flow path Since the pump P having the two flow paths P2 is connected and fixed to the motor M, the motor M and the pump P are fixedly arranged on the horizontal plate portion EA.
[0010]
The motor 21, the reduction gear (not shown), the ball valve 22, and the switching two-way valve 12 including the pressure sensor 13 are fixedly disposed on the horizontal plate portion EA on the right side of the pump P including the motor M. In this example, the pressure sensor 13 and the switching two-way valve 12 are called. In the switching two-way valve 12, a lower joint member 12C including a second flow path 12B, a pressure sensor body 12D, a valve body 12E, and an upper joint member 12F including a first flow path 12A are not illustrated from the lower side to the upper side. Of these, the flange portion 12G extending from the lower joint member 12C to the side is screwed and fixed to the lower surface of the horizontal plate portion EA, and the upper portion 12H penetrates the horizontal plate portion EA. The pressure sensor body 12D is connected and fixed to the upper portion 12H.
Accordingly, the upper joint member 12F, the valve main body 12E, and the pressure sensor body 12D are fixed to the horizontal plate portion EA of the base member E via the lower joint member 12C. It will be fixed to.
With the above, the switching two-way valve 12 is fixedly disposed on the horizontal plate portion EA of the base member E.
[0011]
The hot water supply path 7 is fixedly disposed on the left horizontal plate portion EA of the pump P including the motor M.
Reference numeral 7A denotes a lower joint member that forms a part of the hot water supply path 7, and a flange portion 7B extending to the side is screwed and fixed to the lower surface of the horizontal plate portion EA, and its upper portion 7C penetrates the horizontal plate portion EA. And it is arranged to protrude upward.
The hot water supply passage 7 is connected to the upper portion 7C of the lower joint member 7A fixed to the horizontal plate portion EA. At this time, the outer periphery of the vertical portion 7D of the hot water supply passage 7 arranged along the vertical direction is provided. The heater 9 is disposed so as to surround the vertical portion 7D, and the vertical portion 7D is screwed and fixed to the vertical plate portion EB of the base member E together with the heater 9.
According to the above, the end of the hot water supply path 7 is fixed to the horizontal plate portion EA via the lower joint member 7A, and the vertical portion 7D extending upward from the upper portion 7C of the lower joint member 7A is fixed to the vertical plate portion EB. Thus, the warm water supply path 7 is firmly fixed to the base member E, and the upstream side of the warm water supply path 7 is connected to the first flow path P1 of the pump P via the T-shaped joint 23.
Accordingly, the upstream side of the hot water supply path 7 is connected to the first flow path P1 of the pump P fixed on the horizontal plate portion EA of the base member E, and the downstream side is fixed on the horizontal plate portion EA of the base member E. Since the vertical portion 7D is fixed to the vertical plate portion EB of the base member E, the hot water supply passage 7 is firmly and securely fixed to the base member E.
[0012]
The first mixing valve 5 includes a valve main body 5 </ b> A having a cold water introduction path 5 </ b> B, a hot water inflow path 5 </ b> C, and a mixed hot water path 5 </ b> D, and further includes a wax valve W and a motor 25.
On the other hand, the side plate portion EC of the base member E is formed by bending from the upper side of the vertical plate portion EB to the right. The valve body 5A is disposed on the arm portion ED of the side plate portion EC and screwed. This fixes the first mixing valve 5 to the base member E.
[0013]
The hot water solenoid valve 6 has an inflow path 6B and an outflow path 6C in the valve body 6A, and includes a pilot solenoid valve 24, a flow sensor F 2 , a check valve 26, etc., and the inflow path 6B of the hot water solenoid valve 6 is a first one. The mixed hot water passage 5D of the mixing valve 5 is fixedly connected, and the outflow passage 6C is fixedly connected to the T-shaped joint 23.
That is, since the inflow path 6B is connected to the mixed hot water path 5D of the first mixing valve 5 in the fixed state, and the outflow path 6C is connected to the T-shaped joint 23 in the fixed state together with the hot water supply path 7, the hot water supply electromagnetic valve 6 Is also fixedly arranged on the base member E.
[0014]
Here, the piping system connecting the above-described components will be described again.
The bath return passage 14 connects the first flow path 12A of the switching two-way valve 12 and the second flow path P2 of the pump P, the downstream of the hot water supply path 7 is connected to the lower joint member 7A, and the upstream is a T-type joint. 23, the outlet P 6 C of the hot water supply electromagnetic valve 6 is connected to the T-type joint 23.
[0015]
According to the above, the base member E has the following configuration as bath hot water supply means and reheating means constituting the bath automatic hot water supply unit A, the first mixing valve 5, the hot water supply electromagnetic valve 6, the pump P including the motor M, switching The two-way valve 12 can be fixedly arranged, and the pipes connecting those components, that is, the hot water supply passage 7 including the heater 9 and the T-shaped joint 23 and the bath return passage 14 can be fixedly arranged.
And as a flow path, the lower joint member 7A as the downstream end of the cold water introduction path 5B, the hot water inflow path 5C and the hot water supply path 7 of the first mixing valve 5 and the lower joint member 12C as the upstream end of the bath return path 14 are externally provided. It will open toward.
[0016]
1 described above is shown in FIGS. 2 to 4 as a specific example prepared for simplifying the apparatus and deepening understanding.
2 is a front view of an electric water heater as an automatic bath water heater unit, FIG. 3 is a right side view of FIG. 2, and FIG. 4 is a top plan view of FIG.
The reference numerals used in FIG. 1 are used in FIGS.
[0017]
The bath automatic hot water supply unit A is assembled in a factory, and the bath automatic hot water supply unit A in an assembled state is introduced to the assembly site, and the following operations are performed on the site.
First, the bath automatic hot water supply unit A in the assembly state is disposed in the electric water heater tank 1 and the protective package K covering the electric water heater tank 1, and specifically, the electric hot water is supplied from the opening KA on the side wall of the protective package K. The bath automatic hot water supply unit A is inserted into the gap h between the outer periphery of the container tank 1 and the inner periphery of the protective package K, and the horizontal plate portion EA of the base member E is disposed on the bottom KB of the protective package K. In this state, the horizontal plate EA is screwed to the bottom KB of the protective package K.
According to the above, the base member E and the automatic water heater unit A of the bath automatic hot water supply unit A fixed to the base member E are fixedly disposed in the space h formed between the protective package K.
In this state, it is desirable that at least the lower joint member 7A at the downstream end of the hot water supply passage 7 and the lower joint 12C of the switching two-way valve 12 protrude downward from the bottom KB of the protective package K and open.
The opening KA of the protective package K is preferably opened and closed by a lid KD or the like from the viewpoint of aesthetics or quality control.
FIG. 5 shows a state in which the bath automatic hot water supply unit A is mounted between the electric water heater tank 1 and the protective package K. FIG. 5 is a top plan view thereof.
[0018]
Next, the following piping work is performed.
The cold water introduction path 5B is connected to a flow path downstream of the pressure reducing valve 3 via a tap water flow path 10, and the hot water inflow path 5C is connected to the electric water heater tank 1 via a hot water path 4. The lower joint member 7A at the downstream end of the hot water supply passage 7 is connected to the bathtub 8 through the hot water supply passage toward the bathtub 8 and is opened. Further, the lower joint member 12C upstream of the bath return passage 14 is connected to the bathtub 8A. It is connected to the inside of the bathtub 8 through a bath return passage toward the port 8 and is opened.
Further, a switching two-way valve 12 is disposed on the right side of the pump P, and a vertical portion 7D of the hot water supply passage 7 is disposed on the left side of the pump P. At this time, the first passage of the switching two-way valve 12 is arranged. The bath return passage 14 that connects 12A and the second flow path P2 of the pump P is U-shaped, and the hot water supply path from the first flow path P1 of the pump P toward the vertical portion 7D of the hot water supply path 7 is U-shaped. Shaped.
[0019]
The hot water and tap water are appropriately mixed by the first mixing valve 5 to form hot water having a predetermined temperature, and the hot water supply electromagnetic valve 6 is opened, so that the hot water is bathed via the hot water supply path 7. The hot water is supplied into the bathtub 8 through the pump P, the bath return passage 14 and the switching two-way valve 12.
The hot water supply into the bathtub 8 is stopped when the hot water supply electromagnetic valve 6 closes the flow path.
On the other hand, when the temperature in the bathtub 8 falls below a predetermined temperature, the switching two-way valve 12 opens the flow path and the motor M is driven to start the operation of the pump P. According to this, the bathtub 8 The hot water inside the hot water flows into the hot water supply passage 7 from the bath return passage 14 via the pump P, and the hot water flowing in the hot water supply passage 7 is heated to a predetermined temperature by the heater 9 and is heated to the predetermined temperature. The hot water is supplied again from the hot water supply path 7 into the bathtub 8 so that the temperature in the bathtub 8 can be maintained at a predetermined temperature.
[0020]
In addition, according to this automatic bath unit A, the one-side hot water supply of only the hot water supply path 7 is performed while the water level in the bathtub 8 is measured by the pressure sensor 13 by closing the switching two-way valve 12. Alternatively, the hot water in the bathtub 8 is circulated through the bath return passage 14 and the hot water supply passage 7 by operating the pump P, and the hot water temperature in the bathtub 8 is confirmed. Etc., all of which have been omitted.
[0021]
【The invention's effect】
As described above, according to the electric water heater of the present invention,
(1) The bath automatic hot water supply unit A is set in the sub-assembly state in advance, and this may be simply installed in the gap h between the electric water heater tank 1 and the protective package K. Therefore, the base member E is disposed at the installation site. It is not necessary to search for the installation location for each, and the installation work time can be greatly reduced. Furthermore, since the gap between the existing electric water heater tank 1 and the protective package K is used, the space of the electric water heater as a whole can be reduced. There will be no expansion.
(2) The function as the automatic bath hot water supply unit A if the cooling water introduction path 5B, the hot water inflow path 5C and the lower joint members 7A, 12C of the first mixing valve 5 are connected to the corresponding flow paths in the sub-assembly state. The inspection can be carried out at the factory stage, and a significant improvement in quality was achieved.
(3) When actually installing on site, it is not necessary to find a fixing part for fixing each component, the cooling water introduction path 5B is connected to the water pipe, the hot water inflow path 5C is connected to the hot water path 4, and Since the joint members 7A and 12C may be connected toward the inside of the bathtub, the installation work at the site can be performed very easily and in a short time, and skill is not required for these work.
(4) When a failure occurs in the automatic bath unit A, the failure is immediately repaired by replacing it with another unit, and the failure unit is subsequently analyzed for a defective portion.
Therefore, the time during which the user cannot use the device can be greatly reduced, and the product serviceability can be greatly improved.
(5) Since the base member E is specified, it is not necessary to prepare a wide variety of mounting members such as mounting stays for fixing the main constituent members to the base member E, and common mounting members can be achieved. Manufacturing costs can be reduced.
Further, since the main constituent members are arranged at the specified positions of the specified base member E, the pipes connecting the constituent members are made common, and the manufacturing cost can be reduced.
(6) Since most of the components constituting the automatic bath water supply unit A are arranged in the space h between the electric water heater tank 1 and the protective package K together with the base member E, it is difficult to be subject to external environmental changes. The component parts can be held well over a long period of time, and the durability can be improved.
(7) It is possible to positively absorb the mounting pitch error with respect to the base member of the pump and the switching two-way valve and the mounting pitch with respect to the base member of the pump and hot water supply passage, and greatly impede the flow resistance of the flow path due to deformation of the piping. Is deterred.
[Brief description of the drawings]
FIG. 1 is a configuration diagram including a cross-sectional view of a main part showing an embodiment of an electric water heater according to the present invention.
FIG. 2 is a front view of an embodiment of the electric water heater according to the present invention.
FIG. 3 is a right side view of FIG. 2;
4 is a top plan view of FIG. 2. FIG.
FIG. 5 is a top plan view showing a state in which the electric water heater shown in FIG. 2 is disposed in the gap between the electric water heater tank and the protective package.
FIG. 6 is a system diagram showing an overall configuration of a conventional electric water heater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric water heater tank 5 1st mixing valve 6 Hot water supply solenoid valve 7 Hot water supply path 8 Bathtub 9 Heater P Pump 14 Bath return path K Protection package h Space formed by the electric water heater tank and the protection package

Claims (1)

Hot water in an electric water heater tank heated by electricity,
Bath hot water supply means for controlling to predetermined hot water by mixing with tap water at the first mixing valve, and supplying this hot water to the bathtub via the hot water solenoid valve and hot water supply path;
Hot water in the bathtub is sucked into the pump through a bath return passage by a switching two-way valve and a pump driven by a motor, and the hot water discharged from the pump is heated to a predetermined temperature by a heater surrounding the hot water supply path. Reheating means for heating to the bathtub and supplying it to the bathtub from the hot water supply channel again;
A protective package disposed on an outer periphery of the electric water heater tank and surrounding the electric water heater tank;
In an electric water heater comprising:
A base member (E) formed of a metal plate, a horizontal plate portion (EA), a vertical plate portion (EB),
A side plate portion (EC) extending laterally from above the vertical plate portion (EB),
On the horizontal plate portion (EA), a pump (P) driven by a motor (M) and having an opening in the first flow path (P1) and the second flow path (P2) is fixedly disposed. A motor (21), a ball valve (22), and a pressure sensor (13) are provided on the horizontal plate (EA) on the right side of the pump (P), and the first flow path (12A) opens upward. A switching two-way valve (12) is fixedly arranged,
Also, the vertical plate portion (EB) constitutes a part of the hot water supply path (7), and a vertical portion (7D) around which the heater (9) is surrounded is fixedly disposed.
The side plate (EC) further includes a first mixing valve (5) having a wax valve (W) and a motor (25), a pilot solenoid valve (24), a flow sensor (F) , and a check valve (26). The hot water solenoid valve (6) provided is fixedly arranged,
The second flow path (P2) of the pump (P) and the first flow path (12A) of the switching two-way valve (12) are connected by a U-shaped bath return passage (14) and the pump (P ) First flow path (P1) and the vertical portion (7D) are connected by a U-shaped hot water supply path (7), and the base member is connected to the electric water heater tank (1) and the protective package (K). And an electric hot water supply device that is housed and disposed in a space (h) formed between the two.

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