JPH05223355A - Water boiler - Google Patents

Abstract

PURPOSE:To make it possible to enhance workability and drain off water safety from a tank without splashing water over to other components in terms of a hot water heater used in a kitchen and a bath room or the like. CONSTITUTION:A drain water passage having a drain cook 9 is installed on the way of a water inlet pipeline between a water inlet 3 and a tank 2. The drain cock 9 is provided with a slit 13 which can be handled with a screw or the like by way of a hole 12 of the bottom of a case of a hot water heater. This construction makes it possible to provide a hot water heater which is excellent and safe in workability when water in the tank 2 is drained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater used in kitchens, bathrooms and the like.

[0002]

2. Description of the Related Art In recent years, a water heater having a drain plug has been widely used.

Conventionally, this type of water heater has generally been constructed as shown in FIG. The configuration will be described below.

As shown in FIG. 2, there is a back plate 1 and a heat exchange tank 2 having a heater attached to the back plate 1. As a primary side of the tank 2, a water inlet 3 connected to a water supply pipe, a water shutoff valve 4 for starting or stopping hot water, and a flow rate detecting means 5 for detecting whether water is being supplied to the tank 2 and heating a heater. Further, there is provided a water inlet pipe 7 to which a flow rate adjusting means 6 capable of adjusting the flow rate of discharged hot water is attached. As a secondary side of the tank 2, a hot water outlet 14 connected to the hot water outlet pipe and a hot water outlet pipe 15 for guiding hot water from the tank 2 are provided. A water drain plug 9 is provided at the bottom of the tank 2.
A control circuit 16 for controlling the hot water temperature and a case 11 for covering the control circuit 16 and fitting the back plate 1 are provided.

In the above structure, when the water stop valve 4 is opened, water is supplied to the tank 2 through the water inlet 3 and the water inlet pipe 7, and when the water supply is detected by the flow rate detecting means 5, the heater is heated and heat is exchanged in the tank 2. It is carried out and the hot water is discharged through the hot water outlet pipe 15 and the hot water outlet 14. Then, the control circuit 16 that controls the hot water temperature controls the flow rate adjusting means 6 that adjusts the hot water flow rate to obtain hot water of an appropriate amount and temperature.

In this water heater, the case 1 is used to prevent freezing or to drain water from the tank 2 when not in use for a long period of time.
1 is removed and the drain plug 9 is removed to drain water.

[0007]

In such a conventional water heater, when the water in the tank 2 is drained, the case 11 must be removed and then the drain plug 9 must be removed.
There was a problem that it was dangerous to touch and the workability was poor. In addition, there is a problem that water is not applied to parts of the flow rate detecting means 5 and electronic parts under the tank 2 and it is unsafe. It should be noted that providing the position of the water drain plug 9 at the bottom of the case 11 is difficult to implement because the flow rate detecting means 5 interferes with it.

The present invention solves the above problems, and an object of the present invention is to provide a water heater having good workability and high safety when draining water from the tank 2.

[0009]

To achieve the above object, the present invention provides a water drainage channel having a water drain plug in the middle of a water inlet pipe between a water inlet and a tank. Further, the water drain plug is provided with a groove that can be operated by a driver or the like through a hole in the case at the bottom of the water heater.

[0010]

According to the present invention, in the above structure, the water in the tank can be drained from the outside without removing the case of the water heater.
In addition, the other parts will not be exposed to water.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same numbers are used for the same components as those described in the conventional example.

As shown in FIG. 1, there is a back plate 1 and a heat exchange tank 2 having a heater attached to the back plate 1. As a primary side of the tank 2, a water inlet 3 connected to a water supply pipe, a water shutoff valve 4 for starting or stopping hot water, and a flow rate detecting means 5 for detecting whether water is being supplied to the tank 2 and heating a heater. Further, there is provided a water inlet pipe 7 to which a flow rate adjusting means 6 capable of adjusting the flow rate of discharged hot water is attached. Also,
In order to drain the water in the tank 2, a water drainage channel 10 having a water drain plug 9 is provided between the water inlet 3 and the tank 2. The drain plug 9 faces the bottom of the water heater,
A groove 13 that can be operated by a driver or the like is provided through a hole 12 in the lower part of the case 11 of the water heater. As a secondary side of the tank 2, a hot water outlet 14 connected to the hot water outlet pipe and a hot water outlet pipe 15 for guiding hot water from the tank 2 are provided. A water heater comprising a control circuit 16 for controlling the hot water temperature and a case 11 for covering the control circuit 16 and the back plate.

To explain the operation in the above structure, when the water shutoff valve 4 is opened, water is supplied to the tank 2 through the water inlet 3 and the water inlet pipe 7, and when the water supply is detected by the flow rate detecting means 5, the heater is heated and the tank 2 is opened. Heat exchange is performed in the hot water outlet pipe 1
5, tap water is discharged through the tap 14. Then, the control circuit 16 for controlling the outlet hot water temperature controls the outlet hot water temperature based on the information of the adjusted outlet hot water flow rate by the flow rate adjusting means 6 for adjusting the outlet hot water flow rate, so that an appropriate amount of hot water can be obtained.

Next, the operation of draining water from the tank 2 will be described. First, the drain plug 9 is removed with a screwdriver through the hole 12 at the bottom of the case 11. Then, the water in the tank 2 is guided to the water inlet pipe 7, and can be discharged from the hole 12 in the lower part of the case 11 through the water drainage channel 10 provided in the middle of the water inlet pipe 7.

Therefore, it is possible to provide a water heater having good workability and high safety.

[0016]

As is apparent from the above description of the embodiments, the present invention provides the water drain plug with a groove that can be operated by a driver or the like through the hole in the bottom case of the water heater.
When draining water from the tank, you can do it without removing the water heater case, so there is no danger of touching the control circuit, workability is good, and the parts at the bottom of the tank do not get wet. It is safe because the water in the tank can be drained.

[Brief description of drawings]

FIG. 1A is a schematic side view of the inside of a water heater according to an embodiment of the present invention, and FIG. 1B is a plan view seen from the bottom of the water heater.

FIG. 2 is a schematic side view of the inside of a conventional water heater.

[Explanation of symbols]

 1 Back plate 2 Tank 3 Water inlet 4 Water stop valve 5 Flow rate detecting means 6 Flow rate adjusting means 7 Water inlet pipe 9 Water drain plug 10 Water drainage channel 11 Case 12 Hole 13 Groove 15 Hot water outlet pipe 16 Control circuit

Claims (2)

[Claims] 1. A back plate (base), a tank having a heater attached to the back plate, a water inlet, a water shutoff valve, a flow rate detecting means, and a flow rate adjusting means as the primary side of the tank. A water inlet pipe, a water drainage channel having a water drain plug, a hot water outlet pipe as a secondary side of the tank, and a control circuit,
A water heater comprising a case that covers these and fits with the back plate, and the water drainage channel is provided in the middle of a water inlet pipe between the water inlet and the tank. 2. The water heater according to claim 1, wherein the water drain plug is provided with a groove that can be operated by a driver or the like through a hole in the case at the bottom of the water heater.