JPS6112522Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a first stopping device that has a circulation pump, a circulation heat exchanger that heats the circulating water by the pump, and a hot water supply heat exchanger that heats the water flowing through the pump. The present invention relates to a one-can, two-circuit circulating hot water supply device equipped with a hot water supply circuit of the type shown in FIG.

(Conventional Technique) In conventional devices of this kind, when circulating heating is used alone, the hot water supply circuit receives heat, and the internal pressure of the hot water supply circuit increases, causing damage to parts of the hot water supply circuit, especially those that do not have pressure resistance, such as the heat exchanger. This caused a dangerous situation in which boiling water and steam spewed out from the damaged part. In addition, conventionally, when such pressure increases, for example,
As shown in Japanese Patent No. 54-7430, there is a system in which a pressure relief valve that opens at a constant pressure is attached to the circuit to discharge pressurized steam or hot water.

(Problem that the invention aims to solve) However, with conventional devices, if the device is installed indoors in a kitchen or inside a pipe shaft, it is not possible to discharge water outside the device; However, there is a problem in that the user is required to take out the drain tray and dispose of the water outside, which becomes very cumbersome.

(Means for solving the problem) In order to solve the problem, the present invention has a safety valve that opens the hot water supply circuit and the suction side of the circulation pump of the circulation path when the internal pressure of the hot water supply circuit increases, and a relief water from the safety valve. It is connected via a float valve that opens when the water level reaches a certain level.

(Function) The water released from the safety valve is stored in the float chamber, and when the water level reaches a certain level, the needle valve inside the float valve opens.
It is introduced into the circulation path by the suction force of the circulation pump.

(Example) Hereinafter, an example in which the present invention is implemented in a hot water bath pot that boils bath water by circulating heating will be described in detail based on the drawings.

1 is mainly a circulating hot water supply device, inside the main body 1, a fin 2 is shared, and a circulating heat exchanger 3 is installed below the fin 2.
A one-can type can body 5 having a heat exchanger 4 for hot water supply provided on the upper part, and a burner 6 for heating this can body 5 are provided. 7 is a water supply channel that supplies water to the hot water heat exchanger 4;
Reference numeral 8 denotes a hot water supply path that sends hot water from the hot water heat exchanger 4 to a hot water tap 9 installed in a kitchen or the like. Reference numeral 10 denotes a water flow detector installed in the water supply channel 7, which causes the burner 6 to burn when water flow is detected by the detector 10. , the hot water supply faucet 9, and the water flow detector 10 constitute a first stop type hot water supply circuit. Reference numeral 11 denotes an outgoing pipe for sending circulating water to the circulation heat exchanger 3, and a circulation pump 12 is connected to the outgoing pipe 11.
has been mediated. Reference numeral 13 denotes a return pipe, which loads the outgoing pipe 11 and the return pipe 13, and in this embodiment connects with the bathtub 14 to form a circulation path. 15 is burner 6
This is a gas valve provided in the gas path 16 leading to the. The circulation pump 12 is driven by turning on a switch (not shown), and when a detector (not shown) detects the circulation flow caused by the drive of the circulation pump 12, the gas valve 15 is opened and the burner 6 is started to burn, as in the case of hot water supply. It is designed to let you do so. Reference numeral 17 denotes a relief path that communicates the hot water supply path 8 of the hot water supply circuit with the suction side of the circulation pump 12 of the circulation path, and the relief path 17 is connected in series with a safety valve 18 that opens when the pressure of the hot water supply circuit increases, and a relief from the safety valve 18. A float valve 19 that opens when the water level reaches a certain level is provided, and the relief passage 17 is communicated with a ventilate 20 provided on the suction side of the circulation pump 12.
Next, the float valve 19 will be explained based on FIG. 21 is a float chamber into which the relief water from the safety valve 18 flows, an overflow pipe 22 is opened in the upper part of the float chamber 21, a float 23 is arranged in the float chamber 21, and a lower end of the float 23 is connected to the float chamber 21. A passage 2 communicating with a valve chamber 24 provided in
A needle valve 26 for opening and closing the valve 5 is integrally attached. On the other hand, a valve body 28 is disposed in the valve chamber 24 so as to always shut off the passage 25 from the valve chamber 24 side by means of a spring 27. 29 is a regulating plate for the float 23.

In the above configuration, when hot water is to be supplied, it is sufficient to open the hot water tap 9, a water flow is generated in the water supply channel 7, the water flow detector 10 detects the water flow, and the gas valve 15
The burner 6 opens and the burner 6 burns, and the water flowing through the hot water supply heat exchanger 4 is heated, allowing hot water to be supplied. If it is desired to heat the water in the bathtub 14, a switch (not shown) is turned on to drive the circulation pump 12. By driving the circulation pump 12, the bathtub water flows through the outgoing pipe 11 → the circulation heat exchanger 3 → the return pipe 13 →
The water is circulated through the system from the bathtub 14 to the outgoing pipe 11, and this circulation opens the gas valve 15, causes the burner 6 to burn, and circulates and heats the bathtub water.

By the way, in the one-can type two-circuit circulation hot water supply system as in this embodiment, the water supply tap A has a check function, so when circulation is used alone, the hot water supply circuit is sealed, and the hot water heat exchanger 4 is also heated. This causes the internal pressure in the hot water supply circuit to rise, creating a dangerous situation.

However, according to the present invention, the hot water supply circuit and the suction side of the circulation pump 12 of the circulation path are connected via the safety valve 18, which opens when the internal pressure of the hot water supply circuit increases, and the float valve 19, which opens when the water released from the safety valve 18 reaches a certain level. Since the connection is made, as mentioned above, when the internal pressure of the hot water supply circuit increases, the safety valve 18 opens and the pressure steam and hot water in the hot water supply circuit are discharged from the hot water supply circuit. This prevents damage to the parts. The discharged water then flows into the float chamber 21 through the escape passage 17,
When a certain amount of water is collected in the float chamber 21, the float 23 rises and the needle valve 26 opens the passage 25. If the circulation pump 12 is being driven at this time, the suction force causes the valve body 8 to close the passage. 25 is also opened from the valve chamber 24 side, and the relief water is sucked into the circulation path through the valve chamber 24, making it unnecessary to treat the discharged water as in the conventional example.

Furthermore, by interposing the float valve 19 and storing the discharged water in the float chamber 21 as in the present invention, the float chamber 21 can separate the hot water supply circuit and the circulation path using air, thereby completely preventing cross connections. Moreover, since the float chamber 21 and the circulation path 24 are communicated with each other when a certain amount of water has accumulated in the float chamber 21, air will not be mixed into the circulation path, and the operation is reliable. It will become.

In the embodiment shown in FIG. 2, a valve body 28 that is opened by the suction force of the circulation pump 12 is disposed between the float 19 and the circulation path, but in this example, when the circulation pump 12 stops operating, the valve body 28 is disposed between the float 19 and the circulation path. Since the chamber 19 and the circulation path are shut off by the valve body 28, circulating water does not flow into the float chamber 19. In addition, in this embodiment, a ventilator 20 is installed in the circulation path.
is provided, and the float chamber 2 is installed in the bench ury 20.
In this example, even if the amount of circulating water is low, the ventilating effect can reliably suck up the escape water, and even if the main body 1 is installed above the bathtub 14, the water can be reliably sucked. This has the advantage of sucking out runoff water.

(Effects of the invention) The present invention has such a configuration and has the following effects.

(1) Even if the internal pressure of the hot water supply circuit increases, the safety valve opens and the water flows into the float chamber, so the pressure in the hot water supply circuit does not exceed the appropriate level, thereby preventing damage to the hot water supply circuit.

(2) Once a certain amount of relief water that has flowed into the float chamber accumulates, it is sucked into the circulation path via the valve chamber, making it unnecessary to treat the discharged water.

(3) The hot water supply circuit and circulation path can be separated by air in the float room, completely preventing cross connections.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a sectional view of the main part. 3... Heat exchanger for circulation, 4... Heat exchanger for hot water supply, 12... Circulation pump, 18... Safety valve, 19
... Float valve, 21 ... Float chamber, 23 ...
Float, 24... Valve chamber, 25... Passage, 26...
...needle valve, 28...valve body.

Claims (1)

[Scope of utility model registration request] A first-stop hot water supply circuit having a circulation pump, a circulation heat exchanger for heating circulating water by the pump, and a hot water supply heat exchanger for heating flowing water, wherein the above-mentioned hot water supply circuit and circulation path are provided. is connected to the suction side of the circulation pump through a safety valve that opens when the internal pressure of the hot water supply circuit rises, a float valve that opens when the water released from the safety valve reaches a certain level, and a valve body, and the float valve is a safety valve. It consists of a float chamber into which relief water flows, a float disposed in the float chamber, a valve chamber provided below the float chamber, and a passage connecting the float chamber and the valve chamber, and a needle that opens and closes the passage. 1. A one-can two-circuit circulating hot water supply device, characterized in that a valve is integrally attached to the lower end of a float, and the valve body is disposed in a valve chamber.