JP3134625B2 - Hot water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain plug for a hot water storage type water heater.

[0002]

2. Description of the Related Art As a conventional hot water storage type water heater, there is a water heater as shown in FIG. In FIG. 3, a water supply port 2 of a hot water storage tank 1 is connected to a water supply source via a relief valve 3 and a pressure reducing valve 4. A heater 5 is provided in the hot water storage tank 1 and a hot water outlet 6 is provided.
Is a tap 1 through a relief valve 7, an air release valve 8, and a tapping pipe 9.
Connected to 0. The drain port 11 is connected to a drain plug 12.

In the above configuration, hot water heated by a heater 5 is stored in a hot water storage tank 1. The expansion water generated in the heating process is drained from the relief valve 7 through the relief pipe 13. Also, in the event that the relief valve 7 fails, the expansion water is drained through the relief pipe 14 by operating another relief valve 3, so that overpressure in the hot water storage tank 1 can be prevented. It has a configuration that can be used.

[0004]

SUMMARY OF THE INVENTION Such a conventional hot water storage
In the water heater, in addition to the relief pipe 13 for draining the expansion water from the relief valve 7, a relief pipe 14 for draining the water from another relief valve 3 is required for safety. For this reason, the plumbing work becomes complicated, and a large number of pipes are attached around the water heater, and the aesthetic appearance is significantly impaired.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. Conventionally, a pipe is constructed so that two relief valves can be handled by one, so that the construction can be simplified, the finish of the pipe can be simplified, and the appearance can be maintained. It is intended to provide a hot water storage type water heater that can be used.

[0006]

To achieve the above object, a hot water storage type water heater according to the present invention comprises a hot water storage tank, a heater for heating water in the hot water storage tank, and a water supply source through a pressure reducing valve. A water supply circuit leading to a water supply port of the hot water storage tank, a relief valve from the upper water supply port of the hot water storage tank , a hot water tap via a hot water supply pipe.
A hot water supply circuit leading to the can than the lower discharge port of the hot water storage tank
A drain plug with a can body protection valve that integrates a body protection valve and a drain valve
And a drain circuit leading to a drain pipe through the can body protection valve.
The attached drain plug is connected to a drain port of the hot water storage tank.
A connection port, and a relief pipe for guiding expansion water from the relief valve;
A second connection port for connection, and a third connection port for connection with the drainage pipe.
And the first connection port is manually operated.
A drain valve that can be opened and closed with a can
A protection valve, wherein the second connection port and the third connection port
Has a structure in which the communication is always open.

[0007]

According to the above construction, the drain of the hot water storage tank and the escape
Use separate connecting members for the relief pipe from the relief valve and the drain pipe.
Connection without draining, and drainage-related piping treatment in one place
Because that can be aggregated, it is to simplify the finish of the piping
At the connection with the drain of the hot water storage tank.
Since the water valve and the can body protection valve are integrated, the double safety function of the can body can be maintained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hot water storage type water heater of the present invention will be described below with reference to the drawings.

In FIG. 1, a water supply port 2 of a hot water storage tank 1 is connected to a water supply source via a pressure reducing valve 4. The hot water storage tank 1 is provided with a heater 5, and a tap 6 is connected to a hot tap 10 via a relief valve 7 and a tap pipe 9. The drain port 11 at the lower part of the hot water storage tank 1 is connected to a drain plug 15 with a can protection valve. The hot water tank 1 stores hot water boiled by the heater 5. At the time of hot water supply, hot water is supplied from hot water tap 10 via hot water outlet 6 of hot water storage tank 1, relief valve 7 and hot water pipe 9.
Further, the expansion water being boiled is released from the relief valve 7 through the release pipe 1.
6. Drained through a drain plug 15 with a can protection valve.

The drain plug 15 with a can body protection valve has the structure shown in FIG. In FIG. 2, a second connection port 16 is connected to a relief pipe 13 that guides expansion water from a relief valve 7 above the hot water storage tank 1, and a first connection port is connected to a drain port 11 from the hot water storage tank 1 in a lateral direction . The connection port 17 has a third connection port 18 connected to a drain pipe below the first connection port.
When the hot water in the hot water storage tank 1 is drained, the mouth 17 is manually operated.
19 for opening and closing the first connection port 17 by means of
9 includes a can body protection valve 20 that opens at a certain pressure or higher and a spring 21 that receives the pressure. When the can body protection valve 20 is actuated , the passage opens and the first connection
The port 17 and the third connection port 18 communicate with each other to drain expansion water and the like. Further, when not in use for a long period, the hot water in the hot water storage tank 1 can be drained by opening the valve body 19. Also, the first connection port 17 and the second connection port 16 are always
When open, the expansion from the relief valve 7
The water can be reliably led to the drainage pipe.

According to the above configuration, even if only one relief valve 7 is used, the can body protection valve 20 operates, so that double safety can be maintained. Therefore , another relief valve is provided on the water supply circuit side.
There is no need that, to allow simplification of the construction, and it is possible to improve the appearance and the finish of the piping simple.
In addition, since the can body protection valve 20 is provided integrally with the drain plug, even if the can body protection valve 20 is actuated, it is processed with a normal drain pipe, which is very reasonable.

[0012]

As described above, according to the hot water storage type water heater of the present invention, the drain port of the hot water storage tank and the relief pipe from the relief valve are provided.
Can be connected to the drainage pipe without using a separate connection member.
Wastewater-related plumbing can be centralized in one place.
While being able to simplify the finish of the pipe,
Drain valve and can body protection valve at the connection port with the drain port of the hot water storage tank
Since it is integrated, the double safety function of the can is maintained.
Can have.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a hot water storage type water heater according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the drain plug with the can body protection valve.

FIG. 3 A conventional hot water storage type water heater

[Explanation of symbols]

REFERENCE SIGNS LIST 1 hot water storage tank 2 water supply port 4 pressure reducing valve 5 heater 6 tapping port 7 relief valve 9 tapping pipe 10 hot water plug 11 drain port 13 relief pipe 15 drain plug with can body protection valve 16 second connection port 17 first connection port 18 Third connection port 19 Valve body 20 Can body protection valve

Continuation of the front page (56) References JP-A-3-117853 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1/18 503 F24H 1/18

Claims (1)

(57) [Claims] 1. A hot water storage tank, a heater for heating water in the hot water storage tank, a water supply circuit from a water supply source to a water supply port of the hot water storage tank via a pressure reducing valve, and an upper part of the hot water storage tank
A hot water supply circuit from the hot water outlet to the hot water supply via the outlet valve and hot water supply pipe, and a can body protection valve and drainage from the lower outlet of the hot water storage tank.
Through a drain valve with a can body protection valve integrated with a valve to drain pipe
And a drain circuit with a can body protection valve.
A first connection port connected to a drain port of the hot water storage tank;
A second connecting with a relief pipe for guiding the expansion water from the relief valve
It has a connection port and a third connection port connected to the drainage pipe.
And the first connection port can be manually opened and closed.
Incorporates a drain valve and a can body protection valve that opens above a certain pressure
And the second connection port and the third connection port are always open.
A hot - water storage type water heater with a structure that allows communication in a state .