JPH08270963A - Freezing state preventing device in hot water circulating type heating apparatus - Google Patents

Abstract

PURPOSE: To prevent another hot water circulating passage from being frozen even in the case of a low surrounding air temperature, in winter season, for example, by a method wherein hot water applied for one of a hot air heating and a floor heating is intermittently supplied while the other of the hot air heating and the floor heating is operated independently. CONSTITUTION: In the case that a hot air heating is carried out independently, for example, and secondary hot water (circulating condensed water) is not always circulated in hot water mats Fa, Fb, secondary hot water of about 60 deg.C is intermittently circulated so as to prevent a temperature of water in the secondary hot water in the circulating passage including the hot water mats Fa, Fb from becoming an icing point or less and further to prevent the secondary hot water from being frozen. Due to this fact, opening or closing valves Va, Vb are intermittently opened in such a way that a circulating amount may become minimum within a range that a temperature of time secondary hot water in the circulating passage does not become an icing point or less. The opening or closing valves Va, Vb are operated in response to a thermal state, thereby a valve opening speed can be set as slow as possible. Accordingly, even if the circulating amount of the secondary hot water is kept same, a small amount of water is circulated little by little for a long period of time, it is thereby effective in preventing freezing of water and further a floor temperature is scarcely increased.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, primary hot water heated to a relatively high temperature by a burner is circulated to perform warm air heating, and a part of condensate water is branched and circulated as secondary hot water to a hot water mat for floor heating. A hot water circulation type heating device is known. In such a hot water circulation heating device, 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, respectively. It is configured to individually control the circulation of the next hot water.

[0003]

In the above-mentioned conventional device,
When the outside air temperature is low, such as in winter, there is a risk that the parts of the circulation path of the primary hot water and the secondary hot water that are exposed to the open air will freeze, but while performing hot air heating and floor heating at the same time. The primary hot water and the secondary hot water are always circulated, and there is no concern that the circulation path of each hot water freezes. Also, when both hot air heating and floor heating are not performed, the water in each circulation path is always Circulation can prevent freezing of each circulation path. However, when only one of the hot air heating and the floor heating is performed independently, for example, when the hot air heating is performed alone, the other secondary hot water used for floor heating does not circulate in the circulation path and is frozen. May occur. If the secondary hot water is circulated, there is no risk of freezing, but this will activate the floor heating. Further, since a part of the condensate water is branched to be the secondary hot water, the condensate water is, for example, 60 during the warm air heating operation.
There is a temperature of about ℃, and in order to flow water to the circulation route of the secondary hot water during warm air heating operation, the circulation route of the secondary hot water must be separated from the heating device and a device for flowing water must be added separately. .

In view of the above problems, the present invention provides one of hot air heating and floor heating, for example, when hot air heating by primary hot water is independently operated, the other is floor heating. It is an object of the present invention to provide an antifreezing device in which the circulation route of secondary hot water used does not freeze.

[0005]

In order to achieve the above-mentioned object, the invention of claim 1 circulates the primary hot water heated to a relatively high temperature by a burner to perform warm air heating and a part of the condensed water. A hot water circulation type heating device that circulates as secondary hot water to perform floor heating, in which hot air heating and floor heating can be performed independently, respectively, a primary hot water circulation path and a secondary hot water circulation path An open / close mechanism is provided for each of the hot air heating and floor heating systems, and an open / close mechanism provided in the hot water circulation path for the other operation prevents the freezing of the hot water circulation path for the other operation when operating independently. The feature is that it is opened intermittently in a possible cycle.

Further, the invention of claim 2 is characterized in that, in the invention of claim 1, the opening / closing mechanism provided in the circulation path of the secondary hot water is constituted by a thermal type opening / closing valve.

[0007]

For example, when hot air heating alone is performed, the secondary hot water used for floor heating is not normally circulated, but by intermittently opening the opening / closing mechanism, the hot water circulates in the circulation path and the circulation path Prevent freezing. Since the hot water is circulated, it is not necessary to continuously circulate the water as in the case where the water is circulated in the circulation path, and the freezing can be sufficiently prevented only by intermittently circulating the hot water.

Although the hot air heating operation is not performed even if the primary hot water is circulated if the blower fan for warm air heating is stopped, in the case of floor heating, the hot water mat under the floor is intermittent. Even if there is, the secondary hot water may be circulated and the floor temperature may rise. Therefore, the opening / closing mechanism provided in the circulation path of the secondary hot water according to claim 2 is configured by a thermal dynamic opening / closing valve having a slow opening / closing speed, so that the amount of secondary hot water circulated intermittently does not increase. The secondary hot water is circulated little by little over a relatively long period of time to prevent freezing of the circulation route of the secondary hot water without raising the bed temperature.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an outline of a system that uses a gas water heater 1 to perform hot air heating operation in which the intensity can be switched and hot bath heating. In the case of warm 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 outward path f1 to heat the indoor air with the high-temperature hot water. And blows it indoors as warm air. The air conditioner is provided with a fan for blowing air and a heat exchanger (radiator) which is located in a ventilation path of the fan and through which the primary hot water flows, and the primary hot water temperature is detected to change the primary hot water temperature to some extent. Even so, a proportional control valve is provided to increase / decrease the circulation amount of the primary hot water so that the amount of heat given to the blown air from the radiator is kept constant. The amount of heat given to the blown air can be set in two steps, large and small. When set to a large value, strong heating is performed, and when set to a small value, 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 on-off valve is provided in series with the proportional control valve, The circulation of the primary hot water may be stopped by closing the open / close valve. By the way, in this embodiment, a heat exchanger (cooler) cooled by a refrigerant is provided upstream of the radiator so that it can be used as a cooler in the summer and can also be used as a dehumidifier by simultaneously using the radiator and the cooler. can do. still,
When used as a dehumidifier, the radiator operates under the same conditions as for weak heating. Then, the condensate that has passed through the radiator and applied heat to the air blown from the fan to lower its temperature is recirculated to the gas water heater 1 through the return path b1. The recirculated condensate is heated again by the gas water heater 1 and sent out as the primary hot water from the outward path f1, while a part of the condensate before being heated is branched as the secondary hot water into the outward path f2 and further separated by the separator S. Outbound f3
And the outgoing route f4. Each of the outward paths f3 and f4 is supplied to each of the hot water mats Fa and Fb installed under the floor in the room to perform floor heating, and then is returned to the gas water heater 1 as condensate through the return path b1. In addition, when reheating the bath, a route different from the circulation route of 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 through the return route b2. A part of the primary hot water sucked and sent to the air conditioner A is used to heat the hot water sucked from the bathtub via a liquid-liquid type heat exchanger described later, and the outward path f
Return the heated water into the bathtub through 5. In addition, D is a room temperature sensor which is a room temperature detecting means, and the warm water mat Fa.
The temperature of the room in which Fb is installed is detected.

Referring to FIG. 2, a heat exchanger 11 having a burner 10 as a heat source is provided in the gas water heater 1, and hot water circulated by the pump 2 is passed by the burner 10 through the heat exchanger 11. Is heated to be primary hot water and supplied from the conduit 12 to the outward path f1. Condensed water that has returned via the return path b1 once enters the cistern 3 and then the pump 2
Is sucked. By the way, the condensate discharged from the pump 2 returns to the heat exchanger 11 through the pipe line 13,
Part of the condensate is diverted to the pipeline 14 as secondary warm water and the outward route f
It reaches the separator S through 2. The temperature of the primary hot water is detected by the temperature sensor 5H provided in the conduit 12,
The temperature of the secondary hot water is the temperature sensor 5L provided in the pipe line 14.
The detection signals of both temperature sensors 5H and 5L are sent to a control device (not shown). Thermal separators Va / Vb are provided in the separator S corresponding to the outward paths f3 and f4, and the outward path is generated 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 interrupt the supply of the secondary hot water to the hot water mats Fa and Fb. By the way, on-off valve Va ・ V
b is equipped with a wax pellet inside and a heater for heating the wax pellet, and the wax enclosed in the wax pellet by a slidable piston is heated by the heater and expanded to slide the piston so that it is integrated with the piston. The wax rod is used to push the valve rod to open the valve. Condensate 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.
In the case where the proportional control valve in the air conditioner A is closed to stop the operation of the air conditioner A to operate the floor heating alone, the primary hot water flows directly to the cistern 3 through the bypass BP, Hot water mat Fa as a part of it as secondary hot water
・ Floor heating to Fb is now possible.
The cistern 3 has an electrode 31 for detecting a high water level.
And an electrode 32 for detecting a low water level are provided. When the water amount of the cistern becomes small and the water surface separates 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. If the water surface in the cistern 3 exceeds the lower end position of the electrode 31 and overflows, excess water or hot water is discharged through the drain pipe 34.

By the way, a pipe is provided so as to branch a part of the primary hot water to the liquid-liquid type heat exchanger 4 from the middle of the pipe line 12, and the primary hot water inlet part of the heat exchanger 4 is provided at the inlet part thereof. A thermal type on-off valve Vc is provided. The on-off valve Vc is opened by receiving a control signal from the control device only when reheating the hot water in the bathtub B. The heat exchanger 4 has a pump 40
Due to this, the hot water in the bathtub B is circulated, but when adding water or filling water, hot water is separately supplied from a water heater (not shown) via the pipe line 41, and the heat exchanger 4, the outward path f5 and the return path b2 are supplied. And is supplied into the bathtub B through. Reference numeral 42 is a normally-closed on-off valve, which is opened when hot water is supplied into the bathtub B through the pipe line 41, and the hot water that has passed through the on-off valve 42 passes through the check valve 43 and the flow meter 44. It is supplied through the bathtub B. Reference numeral 45 denotes a water flow switch, which detects that the hot water from the return path b2 due to the operation of the pump 40 is actually flowing into the heat exchanger 4, and operates the pump 40 only when there is hot water in the bath B. The purpose of this is to prevent the pump 40 from being damaged or making noise due to idle operation.

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

By the way, since the on-off valves Va and Vb are thermal type on-off valves as described above, the on-off speed is relatively low. Therefore, compared to the case of using an electromagnetic on-off valve, even if the circulation amount of the secondary hot water is the same, it will be circulated over a long period of time in small amounts, which is advantageous not only for freeze prevention,
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. In addition, the above-mentioned freezing prevention is performed, for example, by providing an outside air temperature sensor on the main body of the gas water heater, and only when the outside air temperature falls below a predetermined temperature (for example, 5 ° C), the amount of secondary warm water flowing to the warm water mat can be determined. It is desirable to minimize and keep the hot air heating capacity from decreasing. By the way, in the above embodiment, the case where the warm air heating operation is performed independently has been described, but the present invention can be similarly applied to the case where the floor heating is performed independently.

[0014]

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, when one of the hot air heating and the floor heating is operated independently, the hot water used for the other is intermittently supplied to improve the performance in winter. Even when the outside air temperature is low, the circulation path of the other hot water is prevented from freezing.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a piping state in the water heater.

[Explanation of symbols]

 1 Gas Water Heater 2 Pump 3 Cistan 4 (Liquid-Liquid) 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 Matte S Separator Va Open / close valve Vb Open / close valve

Claims (2)

[Claims] 1. A hot water circulation type heating device which circulates primary hot water heated to a relatively high temperature in a burner to perform warm air heating and circulates a part of condensed water as secondary hot water for floor heating. In a configuration in which warm air heating and floor heating can be performed independently, an opening / 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 independently provided. A hot water circulation system characterized in that, during operation, an opening / closing mechanism provided in the other hot water circulation path for operation is intermittently opened at a cycle capable of preventing freezing of the other hot water circulation path for operation. Anti-freezing device for heating equipment. 2. The antifreezing device in the hot water circulation heating device according to claim 1, wherein the opening / closing mechanism provided in the circulation path of the secondary hot water is constituted by a thermal type opening / closing valve.