JP2932421B2 - Freezing prevention device in hot water circulation type heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing freezing of a circulation path of primary hot water and secondary hot water of a hot water circulation type heating device.

[0002]

2. Description of the Related Art Conventionally, primary hot water heated to a relatively high temperature by a burner is circulated to perform hot air heating, and a part of condensed water is branched and circulated as a secondary hot water to a hot water mat to perform floor heating. Hot water circulation type heating devices are known. In such a hot water circulation type heating apparatus, an opening / closing mechanism is provided in each of the primary hot water circulation path and the secondary hot water circulation path so that the hot air heating and the floor heating can be independently operated, and the primary hot water and the secondary hot water are respectively provided. It is configured to individually control the circulation of the next hot water.

[0003]

In the above-mentioned conventional apparatus,
When the outside air temperature is low, such as in winter, the portion of the circulation route of the primary hot water and the secondary hot water that is particularly exposed to the outside air may freeze, but during the simultaneous heating of hot air and floor heating The primary hot water and the secondary hot water are both circulating at all times, and there is no concern that the circulation path of each hot water freezes, and when both hot air heating and floor heating are not performed, the water in each circulation path is always By circulating, freezing of each circulation path can be prevented. However, when performing only one of the hot air heating and the floor heating alone, for example, when performing the hot air heating alone, the secondary hot water used for the other floor heating does not circulate in the circulation path and thus freezes. May occur. It should be noted that if the secondary hot water is circulated, there is no fear of freezing, but then floor heating is activated. Further, since a part of the condensed water is branched and used as the secondary hot water, the condensed water is, for example, 60% during the operation of the hot air heating.
There is a temperature of about ℃, and to flow water to the secondary hot water circulation path during hot air heating operation, the secondary hot water circulation path must be separated from the heating device and a separate device for flowing water must be added .

Accordingly, the present invention has been made in view of the above-mentioned problems, and in one of the hot air heating and the floor heating, for example, when hot air heating using primary hot water is operated alone, the other floor heating is used. An object of the present invention is to provide an antifreezing device in which a circulation path of secondary hot water to be used does not freeze.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, an invention according to claim 1 circulates primary hot water heated to a relatively high temperature by a burner to perform hot air heating and to reduce a part of the condensed water. A hot water circulating heating device that circulates as secondary hot water and performs floor heating, wherein hot air heating and floor heating can be performed independently of each other, wherein a primary hot water circulation route and a secondary hot water circulation route are provided. An open / close mechanism is provided for each of the hot water heating and the floor heating, and an open / close mechanism provided in the circulation path of the hot water for the other operation during single operation of the hot air heating and the floor heating prevents the circulation path of the hot water for the other operation from freezing. It is characterized in that it is opened intermittently at a possible cycle.

A second aspect of the present invention is characterized in that, in the first aspect of the present invention, the opening and closing mechanism provided in the circulation path of the secondary hot water is constituted by a thermodynamic opening and closing valve.

[0007]

For example, when hot air heating is performed independently, the secondary hot water used for floor heating is not originally circulated, but the hot water circulates through the circulation path by opening the opening / closing mechanism intermittently. To prevent freezing. Since the hot water is circulated, it is not necessary to continuously circulate the water as in the case of circulating the water in the circulation path. Freezing can be sufficiently prevented only by circulating the hot water intermittently.

If the blower fan or the like for hot air heating is stopped, the hot air heating operation is not performed even if the primary hot water is circulated, but in the case of floor heating, the hot water mat below the floor is intermittent. Even so, secondary hot water may be circulated and the bed temperature may rise. Therefore, by configuring the opening / closing mechanism provided in the circulation path of the secondary hot water with a thermal opening / closing valve having a low opening / closing speed as in claim 2, the amount of secondary hot water circulated intermittently is not increased. The secondary hot water is circulated little by little over a relatively long period of time to prevent freezing of the secondary hot water circulation path without increasing the bed temperature.

[0009]

FIG. 1 shows an outline of a system that uses a gas water heater 1 to perform a hot air heating operation and a reheating of a bath in which the intensity can be switched. In the case of the hot air heating operation, high-temperature hot water (hereinafter, referred to as primary hot water) is supplied from the gas water heater 1 set outdoors to the indoor air conditioner A via the forward path f1, and the room air is heated by the high-temperature hot water. And blow it indoors as warm air. The air conditioner is provided with a fan for blowing air and a heat exchanger (radiator) located in the air passage of the fan and through which the primary hot water flows. Even so, a proportional control valve for increasing or decreasing the circulation amount of the primary hot water is provided so that the amount of heat given to the blown air from the radiator is kept constant. Note that the amount of heat given to the blown air can be set in two stages, large and small. When set to large, strong heating is performed, and when set to small, weak heating is performed. Further, the proportional control valve is configured to be fully closed by a hot air heating stop operation to stop the circulation of the primary hot water, but an electromagnetic open / close valve is provided in series with the proportional control valve, The circulation of the primary hot water may be stopped by closing the on-off valve. By the way, in this embodiment, a heat exchanger (cooler) cooled by a refrigerant is provided upstream of the radiator, and can be used as a cooler in summer, and also used as a dehumidifier by using the radiator and the cooler simultaneously. can do. still,
When used as a dehumidifier, the radiator is operated under the same conditions as for weak heating. Then, the condensed water that passes through the radiator and gives heat to the air blown from the fan to lower the temperature is returned to the gas water heater 1 via the return path b1. The recirculated condensate is heated again by the gas water heater 1 and sent out as primary hot water from the forward path f1, while a part of the condensate before being heated is branched as secondary hot water to the forward path f2 and further separated into the separator S Outbound f3
And a forward path f4. Each of the outgoing routes f3 and f4 is supplied to each of the warm water mats Fa and Fb installed under the floor in the room, performs floor heating, and is returned to the gas water heater 1 as condensed water through the return route b1. In addition, when performing additional reheating of the bath, a circulation path different from the primary hot water for the air conditioner A and the secondary hot water for the hot water mats Fa and Fb is provided, and the hot water in the bathtub B is returned via the return path b2. Using a part of the primary hot water sucked and sent to the air conditioner A, the hot water sucked from the bath tub is heated through a liquid-liquid type heat exchanger, which will be described later, and the forward path f
Return the heated water into the bath through 5. In addition, D is a room temperature sensor which is a room temperature detecting means, and a hot water mat Fa ·
The temperature of the room where Fb is provided is detected.

Referring to FIG. 2, a heat exchanger 11 using a burner 10 as a heat source is provided in gas water heater 1, and hot water circulated by pump 2 is passed through heat exchanger 11 by burner 10. Is heated and becomes primary warm water, and is supplied from the pipe 12 to the outward path f1. The condensed water returned through the return path b1 enters the cistern 3 once, and then returns to the pump 2
Is sucked. By the way, the condensate discharged from the pump 2 returns to the heat exchanger 11 through the pipe 13,
Part of the condensed water is diverted to the pipe 14 as secondary hot water and
2 and reaches separator S. In addition, the temperature of the primary hot water is detected by a temperature sensor 5H provided in the pipeline 12,
The temperature of the secondary hot water is measured by a temperature sensor 5L provided in the line 14.
, And the detection signals of both temperature sensors 5H and 5L are both sent to a control device (not shown). In the separator S, thermodynamic open / close valves Va and Vb are provided corresponding to the outgoing paths f3 and f4, respectively, and the outgoing paths are controlled by a control signal from a control device (not shown) provided in the gas water heater 1. The inlets of f3 and f4 can be individually opened and closed to cut off the supply of the secondary hot water to the hot water mats Fa and Fb. By the way, on-off valves Va and V
b has a wax pellet inside and a heater for heating the wax pellet, and the wax sealed in the wax pellet by a slidable piston is heated by a heater to expand the wax so that the piston slides and is integrated with the piston. The valve rod is pushed by the wax pellet rod to open the valve. Condensed water coming out of the warm water mats Fa and Fb returns to the cistern 3 through the return path b1. By the way, a bypass BP is provided between the forward path f1 and the return path b1.
When the proportional control valve in the air conditioner A is closed and the operation of the air conditioner A is stopped to operate the floor heating alone, the primary hot water flows directly to the cistern 3 through the bypass BP, Hot water mat Fa with a part of it as secondary hot water
・ Single-floor heating can be operated independently in Fb.
The cistern 3 has an electrode 31 for detecting a high water level.
And an electrode 32 for detecting a low water level. When the water level of the cistern decreases and the water surface moves away from the lower end of the electrode 32, tap water passes through the water supply pipe 33 until the water surface comes into contact with the tip of the electrode 31. Even if the water surface in the cistern 3 overflows beyond the lower end position of the electrode 31, excess water or hot water is discharged through the drain pipe 34.

By the way, a part of the primary hot water is piped from the middle of the pipe 12 so as to branch to the liquid-liquid type heat exchanger 4. A thermodynamic on-off valve Vc is provided. The on-off valve Vc is opened by receiving a control signal from the control device only when the hot water in the bathtub B is additionally heated. The heat exchanger 4 has a pump 40
Hot water in the bathtub B is circulated, but when adding hot water or filling hot water, hot water is separately supplied from a hot water heater (not shown) via a conduit 41, and the heat exchanger 4 and the forward path f5 and the return path b2 are supplied. And is supplied into the bathtub B. Reference numeral 42 denotes a normally-closed on-off valve, which is opened when hot water is supplied into the bathtub B via the conduit 41, and the hot water passing through the on-off valve 42 passes through the check valve 43 and the flow meter 44. The water is supplied into the bathtub B through the tub. Reference numeral 45 denotes a water flow switch, which detects that hot water from the return path b2 due to the operation of the pump 40 is actually flowing into the heat exchanger 4, and always operates the pump 40 only when there is hot water in the bathtub B. This prevents the pump 40 from being damaged or noise caused by idling.

In the above configuration, when one of the hot air heating and the floor heating is performed independently, for example, the on-off valves Va and Vb
May be closed together to perform warm air heating by the air conditioner A alone. On the other hand, the hot water mats Fa and Fb are designed to easily radiate heat in order to efficiently perform floor heating. In particular, when a room for performing hot air heating and a room for performing floor heating are different, the open / close valves Va and Vb are set to be open and closed. When the valve is closed and the secondary hot water is not circulated inside, the secondary hot water in the circulation path rapidly cools down, and when the outside air temperature is low as in winter, the secondary hot water may freeze from the portion exposed to the outside air. Therefore, in the case where the hot air heating is performed alone and the secondary hot water is not constantly circulated through the hot water mats Fa and Fb, the secondary hot water at approximately 60 ° C. is intermittently circulated and the hot water mats Fa and Fb including the hot water mats Fa and Fb are circulated. By preventing the temperature of water in the circulation path of the secondary hot water from falling below freezing, freezing in the circulation path of the secondary hot water is prevented. By the way, in order to supply the secondary hot water into the hot water mats Fa and Fb, it is necessary to open the on-off valves Va and Vb. However, if the valves are continuously opened, it is the same as performing floor heating. Become. Therefore, as described above, the on-off valves Va and Vb are intermittently opened such that the circulation amount is minimized within a range in which the temperature of the water in the circulation path of the secondary hot water does not fall below the freezing point. The intermittent valve opening cycle repeats, for example, a cycle of opening the valve for 2 minutes and closing the valve for 15 minutes. When two on-off valves Va and Vb are provided in parallel as in this embodiment, both on-off valves Va and Vb are used.
It is desired to shift the opening / closing timing of the control so that the flow rate of the secondary hot water flowing in the outward path f2 does not largely fluctuate, and to reduce the influence of the primary hot water on the hot air heating.

Since the on-off valves Va and Vb are thermal on-off valves as described above, the on-off speed is relatively low. Therefore, compared with the case of using an electromagnetic on-off valve, even if the circulation amount of the secondary hot water is the same, the secondary hot water is circulated little by little over a long period of time, which is not only advantageous for freezing prevention, but also advantageous.
The floor temperature hardly rises. However, when an electromagnetic on-off valve is used, the same effect can be exhibited by shortening the intermittent cycle. Further, the above-mentioned prevention of freezing is provided, for example, by providing an outside air temperature sensor in the gas water heater main body, and performing it only when the outside air temperature falls below a predetermined temperature (for example, 5 ° C.). It is desirable to minimize it so that the hot air heating capacity does not decrease. By the way, in the above embodiment, the case where the warm air heating operation is performed alone is described, but the present invention can be similarly applied to the case where the floor heating is performed alone.

[0014]

As is apparent from the above description, the present invention is applicable to a case where one of the hot air heating and the floor heating is operated independently and the other is intermittently supplied with the hot water used for the other. Thus, even if the outside air temperature is low, freezing of the circulation path of the other hot water is prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a connection state between a water heater and peripheral devices.

FIG. 2 is a diagram showing a pipe state in a water heater.

[Explanation of symbols]

 Reference Signs List 1 gas water heater 2 pump 3 systan 4 (liquid-liquid type) heat exchanger 5H (primary hot water side) temperature sensor 5L (secondary hot water side) temperature sensor A air conditioner B bathtub D room temperature sensor Fa hot water mat Fb hot water Mat S Separator Va On-off valve Vb On-off valve

Claims (2)

(57) [Claims] 1. A hot water circulation type heating apparatus for circulating primary hot water heated to a relatively high temperature by a burner to perform hot air heating and circulating a part of condensed water as secondary hot water to perform floor heating, In a configuration in which the hot air heating and the floor heating can be performed independently, an opening and closing mechanism is provided in each of the primary hot water circulation path and the secondary hot water circulation path, and one of the hot air heating and the floor heating is used independently. A hot water circulating type wherein an opening / closing mechanism provided in a circulation path of the other hot water for operation is intermittently opened at a cycle capable of preventing freezing of the circulation path of the other hot water for operation. Anti-freezing device in heating system. 2. An apparatus according to claim 1, wherein the opening / closing mechanism provided in the circulation path of the secondary hot water is constituted by a thermostatic opening / closing valve.