JP2002243178A - Heating control method and heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating control method and a heater in which trouble due to intrusion of air into piping is avoided. SOLUTION: At the time of starting operation, a decision is made whether air (10) has intruded a circulation passage (26, piping 38) or not before heating operation is started and a transition to heating operation or a transition to heating operation after removing air from the circulation passage is made depending on the decision results thus avoiding trouble due to intrusion of air into piping employing a resin pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heating control method and a heating device in a central heating system using a heat medium such as hot water.

[0002]

2. Description of the Related Art Conventionally, in a heating system of this type, for example, as shown in FIG. 6, a heating terminal 2 for floor heating installed on the floor and a cistern 4 installed on the floor below are connected to a pipe 6.
And the hot water 8 as a heat medium is heated from the downstairs to the heating terminal 2.
May be circulated.

[0003]

When a resin pipe is used for the pipe 6, the resin pipe has high air permeability, and there is a possibility that outside air may be taken into the pipe 6. 1
0 is the air in the pipe 6. As the height difference between the heating terminal 2 and the cistern 4 is larger, the internal pressure of the pipe 6 is reduced, so that it becomes easier to suck in outside air.

Conventionally, as a countermeasure, a process of forcibly circulating the hot water 8 at intervals of about 700 hours has been performed. If the air 10 has entered the pipe 6, it can be discharged to the cistern 4 side. Therefore, there is an advantage that the hot water 8 does not overflow from the cistern 4 side. This is performed regardless of whether or not air has entered the pipe 6. For this reason, when the air 10 does not invade, it becomes useless processing.

[0005] It is an object of the present invention to provide a heating control method and a heating apparatus which avoid inconvenience due to air intrusion in piping.

[0006]

According to the heating control method and the heating apparatus of the present invention, at the start of operation, whether or not air (10) has entered the circulation path (26, pipe 38) prior to heating operation. Performing the determination process, according to the determination result, to the heating operation, after removing air from the circulation path, by performing the transition to the heating operation, due to air intrusion when using a resin pipe or the like in the circulation path This avoids inconvenience.

According to the heating control method of the present invention, at the start of operation, air (1) is supplied to the circulation path (26, pipe 38) prior to heating operation.
0) is performed to determine whether or not the air has entered, and when the air has not entered, the operation shifts to the heating operation. When the air has entered, the heating medium (water W) is supplied and the circulation is performed. After the air is removed from the road, the operation is shifted to the heating operation. That is, at the start of the operation, as a pre-operation of the heating operation, the presence or absence of air intruding into the circulation path is determined, and when there is no air intrusion, the operation is shifted to the heating operation. in this case,
When air intrusion is confirmed, the heating medium is supplied and circulated, air in the circulation path is eliminated, and then the operation is shifted to the heating operation. As a result, the presence / absence of air is determined before the heating operation, and after the air is removed, the operation shifts to the heating operation, so that the heating operation with an appropriate heat medium amount can be performed. Therefore, even if the resin pipe is used for the circulation path, no inconvenience is caused, and the characteristics of the resin pipe such as light weight and good workability can be utilized.

In the heating control method of the present invention, at the start of operation, a heating medium (water W) is supplied to the circulation path (26, pipe 38), and the heating terminal (2) is supplied to the heating terminal (2) through the circulation path. A process of circulating a medium (hot water 8), a process of determining the intrusion of air (10) in the circulation path in which the heat medium circulates, and, when the air is not detected, the process is shifted to a heating operation to detect the air. And when the heating medium is supplied to the circulation path, the process is shifted to the heating operation. That is, as a pre-operation of the heating operation, a heat medium is supplied to the circulation path, the heat medium is circulated, and the intrusion of air is determined. When there is no air intrusion, the operation is shifted to the heating operation. In this case, when the intrusion of air is confirmed, the heating medium is supplied and circulated, the air in the circulation path is eliminated, and then the operation is shifted to the heating operation. As a result, the presence / absence of air is determined for each operation, and after the air is removed, the operation shifts to the heating operation, so that the heating operation with an appropriate amount of heat medium can be performed.

Further, in the heating control method of the present invention, the replenishment of the heat medium is performed through a heat medium tank (cistern 4). That is, the replenishment of the heat medium can be performed through the circulation path. However, if the heat medium is replenished through the heat medium tank, the amount of the replenished heat medium can be monitored on the heat medium tank side, and the monitoring is easy. .

Further, the heating device of the present invention comprises a heating medium (water W,
Heating means (heat exchanger 24) for heating the hot water 8), a heating terminal (2) for releasing heat from the heat medium, a circulation path (26, pipe 38) for circulating the heat medium to the heating terminal, Air detection means (air sensor 46) for detecting air (10) in the circulation path, replenishment means (water supply pipe 48, valve 50) for supplying the heating medium to the circulation path, When the air is detected in the circulation path, the heating medium is replenished to the circulation path by the replenishing means, and when the air is not detected in the circulation path, the heating medium is circulated. A control unit (control unit 60) for shifting to a normal heating operation circulated to the heating terminal. That is, this heating device realizes a heating control method, and air intrusion into the circulation path can be detected by the air detection means. The control means determines the presence or absence of air based on the detection output, and controls the transition to the heating operation. Therefore, even if a resin pipe is used for the circulation path, no inconvenience occurs, and a resin pipe having excellent characteristics such as light weight and good workability can be used.

[0011] In the heating apparatus according to the present invention, the air detecting means is provided in the circulation path at a higher position than a heat medium tank (cistern 4) for storing the heat medium. That is, when the circulation path is installed at a higher place than the heat medium tank, such as a heating medium tank on the lower floor and a heating terminal installed on the floor, the air detection means is provided at a higher side of the circulation path, for example,
By installing on the heating terminal side, it is possible to accurately detect the air in the circulation path.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention and embodiments thereof will be described below in detail with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of a heating control method and a heating apparatus according to the present invention. In the heating control method and the heating device, for example, a gas water heater 12 is used as a heat source that supplies hot water as a heat medium to the heating terminal 2. As the heat source, a heat source using combustion heat of fuel gas, a heat source using combustion heat of kerosene, a heat source using electric heat, a heat pump, or a heat source using solar heat may be used.

In the gas water heater 12, a burner 14 as a combustion means is installed in a combustion chamber 15, and the burner 14 has valves 16, 18 as gas adjusting means and switching means.
Alternatively, the fuel gas G is supplied via the valve 20. A fan 22 is installed below the burner 14 as air supply means for supplying air necessary for gas combustion.

In the gas water heater 12, a heat exchanger 24 as a heating means for applying the heat of combustion of the burner 14 to the hot water 8 is provided in the combustion chamber 15. This heat exchanger 2
4 is provided with a circulation path 26 as means for circulating the hot water 8 to the heating terminal 2.
8. A cistern 4 is provided as a heat medium tank for storing hot water 8.

The circulation path 26 is provided with a piping 38 for the heating terminal 2 made of a hot water mat or the like, as well as a high-temperature side pipe 32, a low-temperature side pipe 34, and a return pipe 36. A pipe 40 is provided. A bypass pipe 41 is provided between the high-temperature side going pipe 32 and the return pipe 36. HW indicates high-temperature water and LW indicates low-temperature water. The high-temperature water HW flows through the bypass pipe 41 to the return pipe 36 side. For example, resin pipes are used for the pipes 38 and 40, and are connected to the high-temperature side pipe 32, the low-temperature side pipe 34, or the return pipe 36 made of a metal pipe on the gas water heater 12 side via a connection part 42. ing.

A valve 44 is provided on the outgoing side of the pipe 38 on the heating terminal 2 side, and the circulation path 26 is provided on the return side thereof.
That is, the air sensor 46 is provided as air detection means for detecting the air in the pipe 38.

The cistern 4 is provided with a water supply pipe 48 as a replenishing means for replenishing water W as a heat medium from the outside, and a valve 50 as an on-off valve for controlling the replenishment. Level sensors 52 and 54 are provided as means for detecting the level of the hot water 8 in the cistern 4, and the level sensor 52 detects a low level, that is, a replenishment request level, and the level sensor 54 high level, that is, replenishment. The end level is detected, and these detection results are extracted by an electric signal. When the temperature of the hot water 8 in the cistern 4 becomes abnormally high, the hot water 8 is discharged from the overflow pipe 56 to the outside.

The circulation pump 28 supplies hot water 8 to the circulation path 2.
And means for circulating the pressure through 6. An AC motor or a DC motor can be used as the drive source.
In the case of using a DC motor, the number of rotations can be controlled widely.

A control unit 60 is provided as control means for performing heating control and the like, and the control unit 60 is constituted by a microcomputer or the like. Detection outputs of the air sensor 46, the level sensors 52 and 54, and the like are input to the control unit 60 as control information. In addition, various control outputs are obtained from the control unit 60, and control outputs are applied to the circulation pump 28, the valve 50, and the like, and the valves 16,
A control output Vn is applied to 18, 20, 44 and the like.

In such a heating device, when the cistern 4 is installed downstairs and the heating terminal 2 is installed upstairs, the piping 38 of the circulation path 26 is installed at a high place. As shown in FIG. 2, an air sensor 46 may be installed in a portion of the pipe 38 near the heating terminal 2. With this arrangement, the air separated upward from the hot water 8 can be accurately detected by the air sensor 46.

The air sensor 46 detects the electrical resistance between the electrodes from the difference in conductivity between the air 10 and the hot water 8 as shown in FIG. Can be configured with a switch that detects
In this case, a first sensor section 62 in which a part of the pipe 38 is bent and projected upward, and a second sensor section 64 is provided below the sensor section 62, and each of the sensor sections 62 and 64 is provided.
Are provided with electrodes 66 and 68 protruding into the pipe 38. In the example of FIG. 3, the electrode 68 is in contact with the hot water 8, whereas the electrode 66 is in the air 10 and does not touch the hot water 8, so that the conduction of the electrodes 66 and 68 cannot be obtained. At this time, the air 10 is detected. If a resin tube having a high insulating property is used for the pipe 38, it is not necessary to insulate the electrodes 66 and 68 from the pipe 38. However, if the pipe 38 is a conductive metal pipe or the like, the electrode 66 is not used. , 68 are required.

In such a configuration, heating control is performed as shown in FIG.
This will be described with reference to the flowchart shown in FIG.

When an operation start command is issued, such as turning on an operation switch, the process proceeds to step S1, where the valve 50 is opened and water W is supplied from the water supply pipe 48 to the cistern 4 as a heat medium supply process. This replenishment is performed up to the replenishment end level set by the level sensor 54. In this embodiment, the water W is supplied to the circulation path 26 through the cistern 4, but may be supplied directly to the circulation path 26 side.

After such water W replenishment processing, in step S2, the circulation pump 28 is driven, and the hot water 8 is supplied to the circulation path 26.
Execute the process of circulating the data. At this time, step S3
Then, the detection output of the air sensor 46 is taken in, and the air 10
Is performed to determine the presence or absence of. If there is air 10, the flow returns to step S1, and the water W is supplied again.

When the circulation processing of the hot water 8 is performed, the air 10 in the pipe 38 moves through the circulation path 26, flows toward the cistern 4, and is discharged. That is, the processing of steps S1 to S3, that is, the pre-operation processing is executed until the discharge of the air 10 is completed.

After the pre-operation process is completed, the process moves to step S4 to perform the heating operation. In this heating operation, the circulation pump 28 is driven, and the valves 16 and
The fuel gas G is supplied to the burner 14 by opening 18 and the hot water 8 circulates in the circulation path 26. That is, the hot water 8 heated by the heat exchanger 24 flows as the high-temperature water HW to the pipe 40 through the high-temperature outgoing pipe 32, flows to the high-temperature requesting terminal (not shown), and flows to the return pipe 36 through the bypass pipe 41. It merges with the hot water 8 that has passed the high-temperature requesting terminal side, and reaches the cistern 4. The hot water 8 that has exited the cistern 4 flows to the circulation pump 28, branches in the directions of arrows A and B, and when the valve 44 is open, the low-temperature water LW flows to the pipe 38 on the heating terminal 2 side, and the heating terminal 2 After circulating
Return to the return pipe 36. Due to the circulation of the low-temperature water LW, heat is radiated from the low-temperature water LW through the heating terminal 2.

As described above, since the presence or absence of the air 10 in the pipe 38 is determined by the pre-operation before the heating operation to perform the air discharge processing, even if a resin pipe having a high air permeability is used for the pipe 38, there is no problem. Heating can be performed without inconvenience.

Next, FIG. 5 shows another embodiment of the air sensor. In the above embodiment, the presence or absence of air 10
In this embodiment, the presence or absence of the air 10 is determined by focusing on the fact that the fluid resistance changes due to the interposition of the air 10 as compared with the case where only the hot water 8 is used. It is electrically detected. For example, in the air sensor 46, an impeller 70 that rotates by the movement of the hot water 8 is installed in the sensor unit 62 formed in the same manner as in the above embodiment, and the rotation of the rotation shaft 72 of the impeller 70 is converted into an electric signal. A sensor circuit 74 is provided.

According to the air sensor 46, when the hot water 8 moves in the directions of arrows C and D, the rotation of the rotating shaft 72 in the direction indicated by the arrow E is caused by the movement of the hot water 8. , And the change appears as a change in the detection output of the sensor circuit 74. The presence or absence of the air 10 can be determined from this output change.

In the embodiment, the presence or absence of air is detected based on the conduction resistance and the fluid resistance. However, the presence or absence of air can be detected based on the change in light transmittance and the flow rate of hot water, and the air sensor is not limited to the embodiment. Not something.

Further, in the embodiment, hot water is exemplified as the heat medium, but a fluid such as oil or antifreeze can be used, and is not limited to hot water.

[0033]

As described above, according to the present invention,
The following effects are obtained. a At the start of the operation, as a pre-operation before the heating operation, the presence or absence of air in the circulation path is determined, and based on the determination result, the transition to the heating operation is performed, and the transition to the heating operation is performed after removing the air. The characteristics of the resin tube, which is lightweight and has good workability, make it possible to achieve highly reliable control and compensate for the disadvantages of using a resin tube with high air permeability in the circulation path without compromising its disadvantages. Can be utilized. b Since the air detection means is installed in the circulation path installed on the high place side, it is possible to reliably detect air from the characteristics of air that is lighter than the heat medium, and to realize highly reliable heating control using the detection output. Can be.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a heating control method and a heating device according to the present invention.

FIG. 2 is a diagram showing an installation example of an air sensor.

FIG. 3 is a diagram showing an embodiment of an air sensor.

FIG. 4 is a flowchart showing heating control.

FIG. 5 is a diagram showing another embodiment of the air sensor.

FIG. 6 is a view showing air intrusion in a pipe.

[Explanation of symbols]

 2 Heating terminal 4 Systan (heat medium tank) 8 Hot water (heat medium) 10 Air 24 Heat exchanger (heating means) 26 Circulation path 38 Piping (circulation path) 46 Air sensor (air detection means) 48 Water supply pipe (supply means) 50 valve (supply means) 60 control unit (control means) W water (heat medium)

Claims (5)

[Claims] At the start of the operation, a process for determining whether or not air has entered the circulation path is performed prior to the heating operation. When no air has entered, the process shifts to the heating operation and the air enters. A heating control method, wherein the heating operation is started after the air is removed from the circulation path by supplying a heat medium. 2. At the start of operation, a process of supplying a heat medium to a circulation path, a process of circulating the heat medium to a heating terminal through the circulation path, and an intrusion of air into the circulation path through which the heat medium circulates. A process of determining, when the air is not detected, the process is shifted to a heating operation, and when the air is detected, after supplying the heat medium to the circulation path, a process of shifting to the heating operation. A heating control method comprising: 3. The heating control method according to claim 1, wherein the supply of the heat medium is performed through a heat medium tank. 4. A heating means for heating the heat medium, a heating terminal for radiating heat from the heat medium, a circulation path for circulating the heat medium to the heating terminal, and an air detection means for detecting air in the circulation path. A replenishing means for replenishing the circulation medium with the heat medium, at the start of operation, the heating medium is circulated in the circulation path, and when air is detected in the circulation path, the replenishment means supplies the heat medium to the circulation path. Heating means for replenishing the heating medium and, when no air is detected in the circulation path, shifting to a normal heating operation in which the heating medium is circulated to the heating terminal; . 5. The heating device according to claim 4, wherein the air detecting means is provided in the circulation path at a higher position than a heat medium tank storing the heat medium.