JP2003028503A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater without the need of opening by hand a water drain cock of the water heater. SOLUTION: In a hot water heating apparatus comprising a hot water heating machine body 1 and one or a plurality of remote controllers 21, when a water drain switch 24 of the remote controller 21 is operated, a three-way valve 19 is actuated on the basis of an instruction of a control section 20 in the hot water heating machine body 1, and further when a second water supply pipe 3 and a water drain pipe 6 are communicated with each other, an air suction valve 10 is opened to the atmosphere, to discharge remaining water in the second water supply pipe 3, the heat exchanger 2, and the hot water supply pipe 5 to complete water drainage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater having a water heater body and one or more remote controllers.

[0002]

2. Description of the Related Art Conventionally, in a water heater having a water heater main body and one or more remote controllers, when draining water from the water heater main body, the main plug of the water supply source is closed to connect the water supply pipe and the hot water supply pipe. By opening and opening the provided drain plug by hand, drainage was performed and the drain plug was closed after completion.

[0003]

However, in the conventional hot water supply apparatus, when draining water from the water heater main body, the source of the water supply is closed and the user goes to the place where the hot water supply apparatus is located, and the water supply pipe and the hot water supply apparatus of the hot water supply apparatus. It was necessary to manually open the water drain plug provided in the pipe, and the work was extremely troublesome. The present invention has been made to solve the above problems, and an object of the present invention is to provide a hot water supply device that does not require the manual operation of the drain plug of the hot water supply device.

[0004]

[Means for Solving the Problems and Their Actions and Effects] In order to achieve the above object, claim 1 has a function of draining water from the main body of the water heater by operating a switch of a remote controller. You can drain water easily without splashing.

Further, in claim 2, a water supply pipe, a heat exchanger provided in a hot water supply path for heating water supplied from the water supply pipe and supplying the water to the hot water supply pipe, and an intake air provided in the middle of the hot water supply pipe. Since the valve, the drainage valve mechanism having the electric valve in the middle of the water supply pipe, and the button for controlling the drainage valve are provided, the residual water remaining in the water heater can be reliably drained.

According to a third aspect of the present invention, the drainage mechanism is
Since the three-way valve that can switch the flow path in two directions and the water distribution pipe for draining the water outside the housing are provided, the residual water remaining in the water heater can be reliably drained.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of a gas water heater according to an embodiment of the present invention. As shown,
The water heater is the water heater main body 1, from the water source to the water heater main body 1
A first water supply pipe 4 for supplying water to the water, a three-way valve 19 is provided downstream of the first water supply pipe 4 as a drainage valve mechanism, a second water supply pipe 3 is further provided downstream of the three-way valve 19, and a second water supply pipe is further provided. It comprises a heat exchanger 2 for heating the water passing through 3 and a hot water supply pipe 5 for supplying it to the hot water tap 11. Hot water supply pipe 5
Is equipped with an intake valve 10 that supplies air when a negative pressure is reached. Further, the drain pipe 6 is connected to the three-way valve 19 in addition to the first water supply pipe 4 and the second water supply pipe 3, and the motor M for driving the three-way valve 19 simultaneously constitutes a drain valve mechanism. There is.
Then, the control signal from the control unit 20 drives the motor M to move the three-way valve, thereby changing the communication state of the passage.

Further, the first water supply pipe 4 has a water temperature sensor 8 for detecting the temperature Tc of the water from the water supply source, and a quantity Q of water.
Equipped with a water amount sensor 7 for detecting the
A hot water temperature sensor 9 for detecting the hot water temperature Th from which hot water is discharged from 1 is provided.

A fan 12 for supplying the air required for combustion is also provided in the water heater body 1. Further, an igniter 14 necessary for ignition and a frame rod 15 for detecting the presence or absence of flame are provided above the burner 13. Further, a gas supply pipe 18 for supplying gas to the burner 13 is provided, and the gas supply pipe 18 has a proportional valve 16 for varying the amount of gas to be supplied and a solenoid valve for starting / stopping the supply of gas. 17 are provided respectively.

Further, the remote controller 21 has an operation switch 2
2, a temperature setting switch 23 for setting a set temperature Ts of the hot water supplied from the hot water tap 11, a display unit 25 for displaying the temperature setting Ts, and a drain switch 24 for driving the three-way valve 19. . The gas water heater further includes the sensors 7, 8, 9 and the temperature setting switch 2 described above.
Based on the detection signals (Tc, Q, Th, Ts) from 3,
It also includes a control unit 20 that controls the proportional valve 16, the solenoid valve 17, the fan 12, and the like.

FIG. 2 is a control block diagram of the gas water heater according to one embodiment of the present invention. As shown in FIG. 2, the various sensors 7, 8, 9 and the proportional valve 16, the solenoid valve 17, the fan 12, the three-way valve 19 and the like are connected to the control unit 20,
A predetermined detection value is sent to this control unit 20, or the control unit 20
It is possible to receive control by instructions from. A remote controller 21 is connected to the control unit 20 so that the control unit 20 can be remoted.

FIG. 3 is a diagram showing an embodiment of the switching operation of the three-way valve 19.

FIG. 3A shows a water passing state, in which the operation switch 22 of the remote controller 21 in FIG. 1 is in the ON state and the water draining switch 24 of the remote controller 21 is in the OFF operation. That is, the control unit 20 drives the motor M to drive the three-way valve 19
Is a step in which the first water supply pipe 4 and the second water supply pipe 3 are communicated with each other, and the water heater is in a state in which normal combustion is possible.

On the other hand, FIG. 3B shows a drained state, and FIG.
The operation switch 22 of the remote controller 21 is OFF, and the drain switch 24 of the remote controller 21 is ON. That is, this is a step in which the control unit 20 drives the motor M, the three-way valve 19 connects the second water supply pipe 3 and the drain pipe 6, and the residual water in the water heater flows into the drain pipe 6.

FIG. 4 is a flowchart showing the present invention. In step S1, the operation switch 22 is turned off. When the drain switch 24 is turned on in step S2, the drain operation is started, and the three-way valve 19 is started in step S3.
Is switched to the drain pipe 6 side, and the residual water in the water supply pipe a3, the heat exchanger 2, and the hot water supply pipe 5 is
It is discharged from the drainage pipe 6. After 10 minutes have passed in step S4, drainage is completed (step S5). When the water heater is to be used again, the drain switch 24 is turned off in step S6, and the three-way valve 19 is switched to the water supply pipe b4 side in step S7, thereby returning to the normal operating state (step S8).

From the above, the operation of the present invention will be described as follows.

The operation switch 22 of the remote controller is turned on, and the hot water supply tap 11 is opened. The control unit 20 drives the motor M so that the three-way valve 19 connects the first water supply pipe 4 and the second water supply pipe 3. Then, the water amount sensor 7 confirms the water flow amount, and the water temperature sensor 8 detects the water temperature. Then, the temperature setting switch 2 of the remote control is
The necessity of combustion is calculated from the set value by 3, the solenoid valve 17 is opened as necessary, the amount of gas supplied from the gas supply pipe 18 is adjusted by the proportional valve 16, and the burner 13 is ignited by the igniter 14. . Then, the water passing through the heat exchanger 2 is gradually heated, and hot water having a predetermined temperature is supplied from the hot water tap.

Next, when the operation switch of the remote controller is turned off and the water draining switch 24 is turned on, the control section 20 drives the motor M to move the three-way valve 19 to the water draining position. Then, the residual water in the water heater gradually begins to drain from the pipeline on the downstream side of the three-way valve, and the intake valve 10 senses the negative pressure,
By opening to the atmosphere, the residual water in the water heater 1 drains at once.

Next, turn off the drain switch 24 of the remote controller.
When the FF operation is performed, the control unit 20 drives the motor M to drive the three-way valve 19 to the water passage position.

[Brief description of drawings]

FIG. 1 is a block diagram of a gas water heater according to an embodiment of the present invention.

FIG. 2 is a control block diagram showing an embodiment of the present invention.

FIG. 3 is a block diagram of a three-way valve showing an embodiment of the present invention.

FIG. 4 is a flowchart showing an embodiment of the present invention.

[Explanation of symbols]

1 ... Main body of water heater 2 ... Heat exchanger 3 ... Second water supply pipe 4 ... First water supply pipe 5 ... Hot water supply pipe 6 ... Drainage pipe 10 ... Intake valve 11 ... Hot water tap 19 ... Three-way valve 21 ... Remote control 24 ... Drain switch

Claims (3)

[Claims] 1. A water heater comprising a water heater main body and one or a plurality of remote controllers, the water heater having a function of draining water from the water heater main body by operating a switch of the remote controller. 2. A water supply pipe, an intake valve provided in a hot water supply path for heating water supplied from the water supply pipe by a heat exchanger and supplying the water to the hot water supply pipe, and an electric valve in the middle of the water supply pipe. Hot water supply device comprising a drainage valve mechanism and a remote controller having buttons for controlling the drainage valve mechanism 3. The hot water supply apparatus, wherein the water draining mechanism has a three-way valve capable of switching the water flow passage in two directions and a drain pipe for draining residual water outside the water heater main body.