JPS5812931A - Freeze preventing device for heating appliance of hot water supply type - Google Patents

Abstract

PURPOSE:To decrease energy consumption to prevent freeze, by transferring the heat of the motor part of a circulating pump, which intervense to a heating circuit, to a hot water supply circuit. CONSTITUTION:An inner fluid is circulated through a system, consisting of a cistern 8, a circulating pump 8, directional control valves V2, V4, and V5, a heat exchanger 9 for heating, a radiator 11, and coming back to the top cistern 8, during a heating time, and heating by radiating heat from a radiator 11 is taken place. On the other hand, in a freeze preventing time, when burners 2a and 9a are extinguished and a bypass valve 12 is opened, the inner fluid is circulated through a system, consisting of a cistern 8, a circulating pump 7, a directional control valve V1, a heat exchanger pipe 16, a directional control valve V5, a heat exchanger 9 for heating, a bypass valve 12, and coming back to the top cistern 8. During this time, the temperature of an inner fluid can be risen by absorbing the heat from a motor part 14 of the circulating pump 7, accordingly, the temperature of water in a water feed pipe 3a and a water supply tank 3 is kept high, as well, so that the heating apparatus is prevented from ffreezing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a hot water supply circuit including a heat exchanger for hot water supply;
The present invention relates to a freezing prevention device for a hot water heater equipped with a heating circuit including a circulation pump and a heating heat exchanger.

FIG. 1 shows an example of a conventionally known hot water heater, in which a hot water supply circuit (1) has a water supply tank (3) on the inflow side of a hot water supply heat exchanger (2) whose heat source is a burner (2 ) and a hot water storage tank (4) on the outflow side, and both tanks (3) are always open.
(Water is heated and circulated through the heat exchanger (2) and return pipe (5) between 41 and 41, so that the water temperature in the hot water storage tank (4) is maintained at a set temperature.

The heating circuit (6) has a heating heat exchanger (9) between the gas turbine (8) on the inlet side of the circulation pump (7) and the gas gas on the outlet side. -**C Intervening 4mm exchanger OI that uses hot water in the hot water storage tank (4) as a heat source
During normal heating, hot water is circulated between the external fIc heat/vessel and αυ via the distern (8), the circulation & zo X (), and the heat exchanger (9), I'll heated the hot water in two stages from the circulation pump (7) through the side heat exchanger a1 and the heat exchanger (9).

In this case, when the burner is extinguished, the circulation pump (7) turns on the distern (
By circulating the internal fluid through the thread path of 8) → circulation pump (7) → heat exchanger (9) → distern (8), in the hot water supply circuit (1), a heater ( a) or the water supply pipe (3) on the inflow side of the tank (3).
&) are wrapped with tape heaters (b) to prevent freezing. However, to prevent freezing, the circulation pump (7) and heater (a
) (b) is problematic in terms of cost and energy conservation.

The present invention provides a circulation driving circuit for preventing freezing of a heating circuit;
The purpose of this invention is to focus on the heat generated by the pump motor and use this heat to prevent the hot water supply circuit from freezing, thereby solving the above-mentioned disadvantages. The explanation is attached to the figure.

The basic structure of the hot water heater shown in the second figure is not particularly different from that of the conventional type described above, and the same members as those of the conventional type are denoted by the same symbols. Here, as the circulation pump (7), either a canned type pump or a mechanically sealed type pump can be used, but the illustrated example uses a canned type pump.

As shown in FIG. 3, the canned pump has an impeller part α3 and a motor part Q4 integrally assembled, and the rotor housing chamber (+51) of the motor part I is communicated with the impeller part α3, and the motor part (141 If this pump is used as a circulation pump (7), the internal fluid circulated in the heating circuit (6) will absorb the heat of the motor section α and reduce the humidity. rises.

According to an experiment, the internal fluid was water, the capacity of DiStern (8) was 3.5%, the circulation pump (7) was a 100W canned type pump, and the water temperature was increased in 3 hours in an atmosphere of 5-10'. 4
℃ to 30”.

Therefore, in the illustrated example, in order to transfer this heat to the hot water supply circuit (1) to prevent freezing, a heating circuit (6) is used as a heat transfer means.
A heat exchange pipe αe connected to the water tank (3) of the hot water supply circuit (1) and a water supply pipe (3a) on the inflow side thereof were arranged to enable heat exchange as shown in the fourth diagram.

In addition, the heat exchange pipe (161) is always connected to the heating circuit (6), and when the heating is activated,
It is preferable that the vibrator Qe is connected to the heating circuit (6) only during freezing prevention.For this purpose, it is necessary to connect the vibrator Qe to the heating circuit (6) in conjunction with an intermittent switching means for the side heat exchanger (6). ), heat exchange pipes (lefl, side heat exchanger (II) connections with 5 switching valves (v 1) (v2)
...(v5) was provided, and these were controlled to open and close as shown in the table below during normal heating, strong heating, and anti-freezing.

(○...Valve open X...Valve closed) Next, to explain the operation of the illustrated embodiment, during normal heating, the flow is changed from the gas turbine (8) to the circulation pump (7) to the switching valve (72).
)ff4) (V5) → Heating heat exchanger (9) → Heat radiator α
The internal fluid is circulated through the υ→distern (8) line, and heating is performed by the heat exchanger (9) through the operation of the burner (9a), radiating heat from the radiator collection υ.

At this time, if the burner (2a) of the hot water supply heat exchanger (2) is extinguished and there is a risk of freezing in the hot water supply circuit (1), close the switching valves (V2) (V4) and switch the switch. valve (vl)
) (v5) and remove the circulation pump (7) and heat exchanger (9).
), the internal fluid is circulated with a heat exchanger vibrator Q6) interposed between the pipe Qf9, and the water in the hot water supply circuit (1) is heated by heat exchange through the pipe Qf9 to prevent freezing.

During strong heating, distern (8) → circulation pump (7) → switching valve (vz) (v3) → side heat exchanger a1 → heat for heating, exchanger (9) → radiator 0υ → distern (8) The internal fluid is circulated in the yarn path, and is preheated in the side heat exchanger Ql so that it can be heated to a high temperature in the heating heat exchanger (9).

In this case, the hot water storage tank (4) is equipped with a hot water supply heat exchanger (2).
) is operated to maintain a predetermined high temperature.

When preventing freezing by extinguishing the burners (2a) and (9a), open the bypass valve a2 and open the distillation pump (8) → circulation pump (7) → switching valve (Vsu → heat exchange pipe αe → switching valve (v
5) -> Heating heat exchanger (9) -> Bypass valve az -> Circulate the internal fluid through the thread path of DiStern (8).

According to this, freezing of the heating circuit (1) is prevented by the circulation of the internal fluid, and the internal fluid absorbs the heat of the motor section α4 of the circulation pump (7) and the temperature rises as described above. is the water supply pipe (5a) and water supply tank (3) of the hot water supply circuit (1).
) through the heat exchange pipe aQ, the water in the water supply pipe (3a) and water supply tank (3) is kept warm and protected from freezing. According to experiments, the water temperature in the water supply pipe (3a) and the water supply tank (3) was maintained in the range of 5 to 10C in an atmosphere of -10C.

It is more effective to raise the fluid temperature in advance by operating the burner (9a) of the first relaxation heat exchanger (9) for a short time when starting to circulate the internal fluid of the ζ heating circuit (6). In addition, if the temperature of the hot water in the hot water storage tank (4) drops and there is a risk that it may freeze, open the switching valve (V3) to allow the internal fluid to also flow through the auxiliary heat exchanger. Make it.

Wa,,,□＞'7'(7)Re,,$,,,Yaya2,
Yo5. An embodiment in which the heat transfer means is configured so that the heat of the motor section I can be transferred indirectly to the hot water supply circuit (1) via the internal fluid of the heating circuit (6) and the heat exchange pipe αe. However, the invention is not limited to this; for example, when a mechanical seal type is used as the circulation pump (7), the gauging of one motor part is heated to a high temperature, so this gauging is connected to the water supply tank (3). ), etc., so as to be in contact with each other so as to allow heat exchange, so that direct heat transfer from the cold water supply circuit +11 to the hot water supply circuit +11 can be obtained.

Note that the conventional heaters (a) and (b) described above may be left as an auxiliary heat source for freezing prevention, and in this case, of course, the power consumption of the heaters (a) and (b) is significantly reduced.

As described above, according to the present invention, a heat transfer means is provided to transfer the heat of the motor section of the circulation pump that intervenes in the heating circuit to the hot water supply circuit, and this heat can be used to prevent freezing of the hot water supply circuit. This has the effect of reducing energy consumption for anti-freezing and reliably eliminating the above-mentioned disadvantages of the conventional method.
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[Brief explanation of drawings]

Fig. 1 is a system MI diagram of the conventional example, and Fig. 2y is a system MI diagram of the device of the present invention.
The example system diagram i, Figure 5 is a half-cut side view of the circulation pump,
FIG. 4 is a perspective view illustrating the structure of the heat transfer means. +1+...Hot water supply circuit (2)...Hot water heat exchanger (6)...Heating circuit (7)...Circulation pump (9)...Heating heat exchanger 0e...Heat exchange Pipe (heat transfer means) 2 people outside Figure 1 1a Building 2 Figure

Claims (1)

[Claims] A hot water heater comprising a hot water supply circuit in which a heat exchanger for hot water supply is interposed, a heating circuit in which a single circulation pump and a heat exchanger for heating are interposed, and the heating circuit is prevented from freezing by the circulation pump. 1) A heat transfer means is provided for transmitting heat of the motor section of the circulation pump to the hot water supply circuit to prevent freezing of the hot water supply circuit. Freeze prevention device for hot water heaters.