JP3968044B2 - Heating medium leak detection error prevention method for heating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for preventing erroneous detection of a heat medium leak in a heating apparatus such as a central heating system using a heat medium such as water.
[0002]
[Prior art]
In general, a heating device of a central heating system is configured as shown in FIG. The heat source machine A includes a burner 2 and a heat exchanger 3 for heating a heat medium, a pump 4 for circulating the heat medium, and a heat medium tank 5 in which the heat medium is accumulated in a heat medium circulation path 1 such as water. It is arranged. A heating terminal 6 such as a floor heating device is communicated with the circulation path 1 via a forward header 7 and a return header 8, and an open / close valve 13 is disposed in the forward header 7. A heat exchanging unit 10 for heating the bath 9 is arranged in the middle of the circulation path 1. Reference numeral 11 denotes an outward thermistor, reference numeral 12 denotes a return thermistor, and reference numeral 14 denotes an operation signal. The heating medium tank 5 is provided with an electrode as a level sensor for detecting the liquid level of the heating medium. The upper electrode Hi for detecting the upper liquid level and the lower liquid level are detected on this electrode. There is a lower limit electrode Lo to be detected. The heat medium tank 5 is replenished with a heat medium such as water when the liquid level falls below the lower limit level, and overflows when the liquid level reaches a predetermined height higher than the liquid level at the upper limit level. It has become.
[0003]
When an operation signal is input from the heating terminal 6, the heat source machine A is operated, the burner 2 is combusted, and a heat medium such as water circulates in the pump 4, and the on-off valve 13 is opened to be heated by the heating terminal 6. A heating medium is supplied. When there is an operation signal from the bath, heat is exchanged by the heat exchanging unit 10 and the bath is reheated and heated. When the operation of the heating terminal 6 is stopped and only the bath operation is performed, the on-off valve 13 is closed.
[0004]
Although the operation is performed as described above, the level of the heat medium such as water is detected in the heat medium tank 5, and when the liquid level falls below the lower limit level, the heat medium such as water is supplied to the upper limit level. However, if there is a heat medium leak on the heating terminal 6 side, this heat medium leak must be detected, so the following control is performed. That is, when the liquid level falls below the lower limit level, if the replenishment of the heating medium to the upper limit level continues, for example, twice at a replenishment interval of 64 hours or less, it is determined that the heating medium has leaked and the error is stopped.
[0005]
By the way, a resin pipe such as cross-linked polyethylene is used for the pipe line through which the heating medium of the heating terminal 6 passes. However, since such a resin pipe has high air permeability, the heating terminal 6 is arranged at a high position such as on the floor. Then, when the heating terminal 6 is stopped for a long time, air enters due to a water head difference, and a heat medium such as water on the heating terminal 6 side falls and accumulates in the heat medium tank 5 (hereinafter referred to as heat medium dropping). ) If the amount of the heat medium further falls, the heat medium tank 5 overflows. However, if the amount of the heat medium that overflows due to such a heat medium dropping is large, the heating terminal 6 may not be vented unless the heat medium is replenished to the heat medium tank 5 many times. In such a case, there is a possibility that the heat medium is erroneously detected as a leakage of the heat medium and the error is stopped, although the heat medium is replenished for dropping the heat medium.
[0006]
In order to prevent this erroneous detection, the decrease in the liquid level in the heating medium tank 5 due to the leakage of the heating medium and the decrease in the liquid level due to the dropping of the heating medium in the heating terminal 6 are distinguished by the operation suspension time of the heat source unit A. Is long, it is determined that the heating medium is replenished due to overflow due to the falling of the heating medium, and there is one that prevents erroneous detection by repeatedly replenishing the heating medium without giving an error (for example, Patent Document 1).
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-295846
[Problems to be solved by the invention]
However, in the above-described conventional technology, since the heat medium leakage or the heat medium dropping is determined only by the operation stop time and the liquid level in the heat medium tank, there are the following problems.
(1) It is determined whether or not air has entered the heating piping system based on whether or not the operation stop time is equal to or longer than a predetermined time, and erroneous detection of a heat medium leak is prevented. In other words, the longer the operation stop time, the more the heat medium does not circulate in the heating terminal and the more air may enter the heating piping system, and the more air enters, so operation after the operation stop time has become longer When the temperature of the heating medium tank drops below the lower limit level, it is considered that the heating medium has overflowed. Therefore, the liquid level in the heat medium tank decreases after the operation has been stopped for a long time without determining that the heat medium has leaked. It prevents false detections that are judged as leaks. Therefore, even if the heating terminal is installed at a position lower than the heat source machine, even if air does not actually enter, the heating medium leaks in the heating operation after stopping operation for a certain time or more. Do not make a decision. That is, when a heat medium leak actually occurs, the detection of the heat medium leak may be delayed. In addition, when multiple heating terminals are connected and the heating terminals are operated in order with a large amount of air intruding into each terminal system, erroneous detection of heat medium leakage can be prevented first. Only the heating terminal that went. About the heating terminal which operated after the 2nd, since operation stop time will be less than a fixed time, when air has penetrated into the 2nd and subsequent heating terminals, it will be mistakenly detected as a heat carrier leak. .
(2) In order to determine whether or not air has entered the heating piping system based on whether or not the operation stop time is equal to or longer than a predetermined time, one heating terminal in a case where a plurality of heating terminals are connected ( If only the bathroom heater / dryer that may be used) is used on a daily basis, the operation downtime is shortened. However, since other heating terminals (floor heating used only in winter, for example) are not actually operated, air continues to enter when the heating season is off, and the heat medium replaced by air from the heating terminal to the heat medium tank May return and overflow. In this state, if a heating terminal that has not been operated at the beginning of the heating season is operated, it may be erroneously detected as a heat medium leak.
(3) In addition, there is a possibility that a device that uses the same heat source device to reheat a bath may be erroneously detected if it is determined by the operation stop time (when reheating, a heat medium is circulated through the heating terminal. Since the air is circulated in the heat source machine, the air from the heating terminal is not released, and since the reheating is a function that is used frequently, the operation stop time is shortened.)
[0009]
The present invention has been made in view of the above points, and it is intended to provide a method for preventing erroneous detection of a heat medium leak in a heating apparatus that can reliably prevent erroneous detection as a heat medium leak despite a heat medium drop. It is to be an issue.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the method for preventing erroneous detection of leakage of a heating medium in a heating apparatus according to claim 1 of the present invention is the heating medium leakage of a heating apparatus that performs heating by circulating a heated heating medium to a heating terminal through a circulation path. A method for preventing erroneous detection, wherein whether or not the liquid level of the heating medium in the heating medium tank provided in the middle of the circulation path is equal to or higher than a predetermined upper limit level, the liquid level of the heating medium tank is equal to or lower than the predetermined lower limit level. A process for determining whether or not there is a process for replenishing the heat medium to a predetermined upper limit level when the liquid level of the heat medium is equal to or lower than a lower limit level,
The number of times of replenishing the heat medium or the number of times the liquid level of the heat medium reaches a predetermined lower limit level (the number of times of replenishing the heat medium or the number of times of the liquid level of the heat medium reaching a predetermined lower limit level is hereinafter simply referred to as the number of replenishments) A process for determining that the heat medium leaks when the temperature exceeds a certain number of times, and a process for determining whether or not the state where the liquid level of the heat medium is equal to or higher than a predetermined upper limit level is equal to or longer than a predetermined time. If the heat medium becomes equal to or lower than the predetermined lower limit level in the operation after the state where the value is equal to or higher than the predetermined upper limit level continues for a predetermined time or longer, the replenishment process is repeated without performing the heat medium leak determination, In the operation after the state where the liquid level of the medium is not lower than the predetermined upper limit level does not continue for the predetermined time or longer, the leakage of the heat medium is determined when the heat medium becomes lower than the predetermined lower limit level.
[0011]
By monitoring the state in which the liquid level in the heat medium tank continues to be at or above the upper limit level as described above, it can be predicted whether or not the heat medium has dropped. During the heating operation, since the expansion of the resin pipe due to the temperature rise is larger than the expansion of water, the liquid level in the heat medium tank is lowered. After the operation is stopped, the liquid level is returned to the upper limit level because it contracts and returns to the original level. That is, when the operation is performed, the liquid level in the heat medium tank is always below the upper limit level. Further, as the heating operation time becomes longer, the liquid level in the heat medium tank gradually decreases due to evaporation, and therefore, after the elapse of a certain time, becomes lower than the upper limit level. On the other hand, when the heat medium drops, the liquid level in the heat medium tank rises according to the amount of air that has entered. That is, it is possible to determine whether or not the heat medium has dropped by monitoring whether or not the heat medium tank is above the upper limit level. Therefore, when the heating terminal is operated after the liquid level has exceeded the upper limit level for a predetermined time or more, it is determined that the heat medium is leaked and the error does not stop even if the heat medium is replenished frequently. . If the time that the liquid level of the heat medium is equal to or higher than the upper limit level is within the predetermined time, it is unlikely that the heat medium has overflowed. Can increase the sex. In addition, by distinguishing between heat medium leakage and heat medium dropping by monitoring the time during which the liquid level in the heat medium tank is above the upper limit level, it is more accurate than the conventional operation downtime. And prevent false detection.
[0012]
According to a second aspect of the present invention, there is provided a method for preventing erroneous detection of a heat medium leak in a heating apparatus, wherein the heating medium is erroneously detected in a heating apparatus that performs heating by circulating a heated heat medium to a heating terminal through a circulation path. Whether the liquid level of the heat medium in the heat medium tank provided in the middle of the circulation path is equal to or higher than a predetermined upper limit level and whether the liquid level of the heat medium tank is equal to or lower than a predetermined lower limit level are determined. Processing, when the liquid level of the heating medium is lower than the lower limit level, processing for supplying the heating medium to the heating medium tank to a predetermined upper limit level, and leakage of the heating medium when the number of times of supply exceeds a certain number. A process for determining and a means for counting an elapsed time after detecting the operation signal of the heating terminal is provided, and the operation of the heat medium is performed in an operation within a certain time after the operation signal from the heating terminal is received. When the liquid level falls below the lower limit level, heat medium leakage judgment is performed. The above replenishment process is repeated, and in the operation where the elapsed time after receiving the operation signal from the heating terminal is a certain time or more, if the liquid level of the heat medium falls below the lower limit level, the determination of the heat medium leak is made. It is characterized by performing.
[0013]
The fact that the replenishment operation is performed immediately after the operation signal from the heating terminal is received is not a heat medium leak, but is assumed to be due to the replacement of the air accumulated due to the overflow of the heat medium, so the heat medium leak Do not make a decision. Heat medium leak detection is not performed within a certain time (for example, about 5 minutes) after the start of heating operation. As described above, immediately after the start of heating operation, the air accumulated in the heating terminal may be replaced. If there is a large amount of overflow, the heat medium is frequently replenished, so an error stop is detected as a detection of the heat medium leak. do not do. After a certain amount of time (for example, about 5 minutes) has elapsed since the start of the heating operation, the air venting is completed. After that, the heat medium is not replenished unless the heat medium leaks. I do. Thereby, it is possible to prevent erroneous detection of air bleeding due to overflow as a heat medium leak by a very simple process in which the heat medium leak detection is not performed within a certain time after the heating operation is started. Further, by not detecting the heat medium leak within a certain time after the start of the heating operation, it is possible to make a more accurate determination than the conventional operation stop time and to prevent erroneous detection.
[0014]
According to a third aspect of the present invention, there is provided a method for preventing erroneous detection of a heat medium leak in a heating apparatus, wherein the heated medium is circulated to a heating terminal through a circulation path for heating. Whether the level of the heat medium in the heat medium tank provided in the middle of the circulation path is equal to or higher than a predetermined upper limit level and whether the liquid level in the heat medium tank is equal to or lower than a predetermined lower limit level. Processing to replenish the heating medium to a predetermined upper limit level when the liquid level of the heating medium is below a lower limit level, and heat medium leakage when the number of replenishment times exceeds a certain number And the elapsed time from when the operation signal from the heating terminal is detected until the liquid level of the heating medium falls to the lower limit level, or the elapsed time until the liquid level of the heating medium falls from the upper limit level to the lower limit level Means for counting the heat medium in the heat medium tank. When the elapsed time when the position is lowered as described above is within a certain time, the above replenishment process is repeated without performing the heat medium leak determination, and the elapsed time when the liquid level of the heat medium in the heat medium tank is lowered as described above. Is characterized by determining whether the heat medium leaks or not.
[0015]
If the liquid level in the heat medium tank is drastically lowered, it is expected that the air is accumulated when the heat medium drops and overflows, so that the heat medium leak is not detected. If the elapsed time until the liquid level of the heat medium falls to the lower limit level is within a predetermined time, it is determined that the heat medium has overflowed and the heat medium leak is not detected. Does not stop due to a false detection. If the elapsed time until the level of the heat medium drops to the lower limit level is equal to or longer than the specified time (when the speed of the liquid level of the heat medium is low), it is unlikely that the heat medium has overflowed. By performing the detection, the reliability of the heat medium leak detection can be improved. In addition, when the elapsed time when the liquid level of the heat medium falls to the lower limit level is within a predetermined time, the heat medium leakage is not detected, so that the determination can be made more accurately than the conventional operation stop time, and erroneous detection can be prevented.
[0016]
Note that when a large amount of leakage occurs, the time until the liquid level drops and the lower limit level is cut is shortened. If the upper limit is not reached within the time (about 2 minutes), it is determined that there is a large leak.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
The structure of the heating device is as shown in FIG. 1 and is the same as that described in the prior art, so that the description thereof is omitted. The control means for performing the heating control and the like is constituted by a microcomputer or the like, and controls the heat medium leakage detection control, the heat medium replenishment control, the heat medium circulation control, the heating operation control, the bath reheating control, and the like.
[0018]
By the way, in the case of a heat medium leak on the heating terminal 6 side, the liquid level in the heat medium tank 5 continues to decrease gradually from the upper limit level as shown in FIG. 2 (a) to the lower limit level as shown in FIG. 2 (b). Then, the heating medium is replenished to the upper limit level when the liquid level of the heating medium falls below the lower limit level. For example, if the phenomenon in which the replenishment interval is within 64 hours continues twice, for example, it is determined that the heat medium leaks.
[0019]
Further, in the case of a heat medium drop from the piping system of the heating terminal 6, the liquid level continues to rise from the upper limit level as shown in FIG. 3 (a) and overflows and overflows (of the heating terminal 6). (The piping system is replaced with air.) If air has accumulated in the piping over a long period of time, the liquid level will drop rapidly as shown in FIG. In the case of heat transfer, there is a phenomenon as described above, but in the case of the present invention, the heat transfer is determined using the characteristics of the phenomenon of the transfer of heat. Sometimes the heat medium replenishment operation is repeated without stopping the error of the heat medium leak.
[0020]
That is, as an example, it is determined that the heat medium has dropped as follows, for example. In the case of a heat medium drop, the state where the liquid level of the heat medium is higher than the upper limit level as shown in FIG. 3B continues, but the state where the liquid level is high means that the heat medium has dropped. Conceivable. For this purpose, means for measuring the time during which the liquid level of the heat medium continues to be higher than the upper limit level is provided, and it is determined whether or not the time during which the liquid level of the heat medium continues to be higher than the upper limit level is longer than a predetermined time. Thus, it is determined whether or not the heat medium has dropped.
[0021]
As another example, it is determined that the heat medium has dropped as follows, for example. In the case of dropping the heat medium, the liquid level suddenly drops as shown in FIG. 3 (c) from the state of FIG. 3 (b) when operated, but this sudden drop in the liquid level means that the heat medium has dropped. It is thought that replenishment was repeated because the amount of circulating heat medium decreased because the heat medium overflowed. For this reason, there is provided means for measuring the elapsed time until the liquid level of the heat medium tank 5 falls to the lower limit level after detecting the operation signal, or the time for the liquid level to fall from the upper limit level to the lower limit level. It is determined whether or not it is an overflow due to dropping of the heat medium by determining whether or not it is 1 minute) or more.
[0022]
As another example, it is determined that the heat medium has dropped as follows. When the operation signal is input after the heat medium falls and overflows, the liquid level of the heat medium is lowered and the replenishment of the heat medium is considered only for a certain period of time (for example, 5 minutes) from the start of operation. It is done. The fact that the liquid level of the heating medium falls within this fixed time is considered to be a drop of the heating medium. Therefore, it is determined by determining whether the liquid level of the heating medium falls to the lower limit level within a certain period of time after the start of heating operation. It is determined whether or not the medium has fallen out.
[0023]
By the way, in this invention, the liquid position of the heat medium tank 5 is below a predetermined lower limit level whether the liquid level of the heat medium of the heat medium tank 5 provided in the middle of the circulation path 1 is more than a predetermined upper limit level. A process for determining whether or not the liquid level of the heating medium is equal to or lower than a lower limit level, a process for supplying the heating medium to the heating medium tank to a predetermined upper limit level, and a number of times the heating medium is supplied. In addition to a process for determining that the heat medium leaks when the number of times exceeds a certain number of times, and a process for determining whether or not the state where the liquid level of the heat medium is equal to or higher than a predetermined upper limit level is equal to or longer than a predetermined time If the heat medium falls below a predetermined lower limit level in the operation after the state where the liquid level of the medium is equal to or higher than the predetermined upper limit level continues for a predetermined time or longer, the replenishment process is repeated without performing the heat medium leak determination. The state where the liquid level of the heat medium is equal to or higher than the predetermined upper limit level Heat medium is when it becomes less than a predetermined lower limit level and performs the determination of the heating medium leakage in the operation after does not continue for a predetermined time or more.
[0024]
In the case where the heat medium is dropped as described above, the state in which the liquid level of the heat medium is higher than the upper limit level as shown in FIG. 3B continues. it seems to do. Therefore, when the time that the liquid level of the heat medium is equal to or higher than the upper limit level is equal to or longer than a predetermined time, the heating medium tank 5 is heated. At the beginning of the operation immediately after the start of operation, the determination of a heat medium leak is not performed as a heat medium drop, and erroneous determination is prevented.
[0025]
In the present invention, the elapsed time from when the operation signal from the heating terminal 6 is detected until the liquid level of the heating medium is lowered to the lower limit level or the elapsed time until the liquid level of the heating medium is lowered from the upper limit level to the lower limit level is set. Means for counting, and when the elapsed time when the liquid level of the heat medium in the heat medium tank 5 falls within a certain time as described above, the replenishment process is repeated without performing the heat medium leak determination, When the elapsed time during which the liquid level of the heat medium in the tank 5 falls as described above is equal to or longer than a certain time, the heat medium leakage is determined.
[0026]
When the heat medium drops and overflows as described above, the liquid level suddenly drops as shown in FIG. 3 (c) from the state of FIG. 3 (b) when operated, but the liquid level suddenly drops like this. This is thought to be a drop of heat. Therefore, the elapsed time from when the operation signal from the heating terminal 6 is detected until the liquid level of the heating medium is lowered to the lower limit level, or the elapsed time until the liquid level of the heating medium is lowered from the upper limit level to the lower limit level is counted. However, when the elapsed time is within a certain time (for example, 1 minute), the misjudgment is prevented by not judging whether the heat medium leaks as a heat medium drop at the beginning of the operation immediately after starting the heating operation. It is like that.
[0027]
Further, in the present invention, there is provided means for counting an elapsed time after detecting the operation signal of the heating terminal 6, and the operation of the heat medium in the operation within a certain time after the operation signal from the heating terminal is received. When the liquid level is lower than the lower limit level, the replenishment process is repeated without performing the heat medium leak determination, and the heat is increased in the operation in which the elapsed time after receiving the operation signal from the heating terminal 6 exceeds a certain time. When the liquid level of the medium falls below the lower limit level, the determination of the leakage of the heat medium is performed.
[0028]
When the heat medium drops and overflows as described above, the level of the heat medium drops rapidly for a certain time (for example, 5 minutes) from the start of operation. The lowering of the position is considered to be an overflow of the heat transfer medium. For this reason, the process which counts the elapsed time after detecting the operation signal from the heating terminal 6 is provided, and when the elapsed time after the detection of the operation signal of the heating terminal 6 is within a predetermined time, As a result of the overflow, the determination of the leakage of the heat medium is made so as not to make an erroneous determination.
[0029]
Next, the method for preventing erroneous detection of a heat medium leak in the heating apparatus of the present invention will be described with reference to the flowchart of FIG. In this description, in order to describe the heat medium as water, the liquid level of the heat medium is assumed to be water level, the supply of the heat medium is assumed to be supplementary water, the heat medium leakage is assumed to be water leakage, and the heat medium drop is assumed to be water drop. When the operation switch is turned on to start the heating operation, the pump operation is always performed before the heating operation, and the water circulation is performed in the circulation path 1, but the flowchart control shown in FIG. 4 is a normal heating operation. It is executed continuously, regardless of whether the pump is running or stopped.
[0030]
First, in step S1, it is determined whether or not there is an operation command from the heating terminal 6. If there is an operation command, the process proceeds to steps S2, S3, and S4. Before the heating terminal 6 is operated, the time during which the water level of the heat medium tank 5 is equal to or higher than the upper limit level is counted, and in step S2, it is determined whether or not the time during which the water level continues to be higher than the upper limit level is equal to or longer than a predetermined time. . In addition, the time from the start of operation of the heating terminal 6 to the low water level is counted, and in step S3, it is determined whether the low water level is reached within a certain time (for example, 1 minute) from the start of operation of the heating terminal 6. Further, the time from the start of operation of the heating terminal 6 is counted, and it is determined in step S4 whether it is within a certain time (for example, 5 minutes) from the start of operation of the heating terminal 6.
[0031]
If it is determined in step S2 that the time is equal to or longer than the predetermined time, or if it is determined in step S3 that the time is within a certain time, or if it is determined in step S4 that the time is within the certain time, the water falls and overflows. Since it is highly possible, the process proceeds to step S17. If it is determined in step S2 that it is not longer than the predetermined time, it is determined in step S3 that it is not within a certain time, and if it is determined in step S4 that it is not within a certain time, it is determined that there is little possibility that the water has overflowed and overflowed. Thereafter, the water leak is detected.
[0032]
In step S5, it is determined whether or not the water level of the heat medium tank 5 is the lower limit level. If it is determined that the water level is lower than the lower limit level, the process proceeds to steps S6, S7, and S8, and water is replenished to the upper limit level. If it is determined in step S5 that the level is not lower than the lower limit level, the process returns to step S1. When water is replenished to the upper limit level in steps S6, S7, and S8, the process proceeds to steps S9 and S10. In steps S9 and S10, it is determined whether or not the water level becomes low within a certain time (for example, 64 hours) after the replenishment is stopped. If the water level does not become low within the certain time, it is determined that there is no water leakage and the process returns to step S1. If it is determined in steps S9 and S10 that the water level in the heat medium tank 5 has become the lower limit level or less within a certain time after the refilling is stopped, the process proceeds to steps S11, S12, and S13, and the water level in the heat medium tank 5 reaches the upper limit level. Water is replenished. When the water is replenished to the upper limit level, the process proceeds to steps S14 and S15. In steps S14 and S15, it is determined whether or not the water level is low within a certain time (for example, 64 hours) after the replenishment is stopped. If the water level does not fall below the lower limit level within the certain time, it is determined that water has not leaked and the process returns to step S1. If it is determined in steps S14 and S15 that the water level of the heat medium tank 5 has become the lower limit level or less within a certain time after the replenishment of water is stopped, it is determined that there is a water leak and the error is stopped.
[0033]
If it is determined that there is a possibility of water leakage and overflow, the process proceeds to step S17, where it is determined whether the water level in the heat medium tank 5 is lower than the lower limit level in step S17. If it is determined in step S17 that the level is lower than the lower limit level, the process proceeds to steps S18, S19, S20, and the water level in the heat medium tank 5 is replenished to the upper limit level. When water is replenished to the upper limit level, the process proceeds to steps S21 and S22. In steps S21 and S22, it is determined whether or not the lower limit level is reached within a certain time (for example, several minutes) after the replenishment is stopped. If it becomes below the lower limit level within a certain time, the water is replenished to the upper limit level in steps S23, S24, and S25 as replenishment due to overflow of water. If the water level falls below the lower limit within a certain period of time, it will be refilled. If it does not become below the lower limit level within a certain time in steps S21 and S22, it is determined that the water replenishment due to overflow of water has ended, and the process returns to step 1. In addition, there is a possibility that the above replenishment may be repeated even if a large amount of leakage occurs. In this case, a separate means for determining large amount of leakage is provided, and the water level reaches the upper limit level within a certain time (about 2 minutes) after the start of replenishment. If not, it is determined that there is a large leak.
[0034]
【The invention's effect】
The invention of claim 1 of the present invention comprises a process for determining whether or not the state where the liquid level of the heating medium is equal to or higher than a predetermined upper limit level as described above is longer than or equal to a predetermined time. If the heat medium falls below a predetermined lower limit level in the operation after the state that is above the level continues for a predetermined time or longer, the replenishment process is repeated without performing the heat medium leak determination, and the liquid level of the heat medium When the heat medium falls below the predetermined lower limit level in the operation after the state where the value is equal to or higher than the predetermined upper limit level does not continue for the predetermined time or longer, the heat medium leak level is determined, so that the liquid level of the heat medium tank is the upper limit. By monitoring the time over which the state above the level continues, it is possible to distinguish between a heat medium drop and a heat medium leak, and a heat medium drop and a false detection even if the heat medium is dropped and the heat medium is replenished. It is possible to prevent an error stop and By monitoring the time during which the liquid level of the tank continues to be higher than the upper limit level, it is possible to distinguish more accurately than the conventional operation downtime by distinguishing between heat medium drop and heat medium leak. It can prevent detection.
[0035]
Moreover, the invention of claim 2 of the present invention comprises means for counting the elapsed time after detecting the operation signal of the heating terminal as described above, and the elapsed time after receiving the operation signal from the heating terminal. If the liquid level of the heat medium falls below the lower limit level during operation within a certain time, the above replenishment process is repeated without performing the heat medium leak determination, and the elapsed time after receiving the operation signal from the heating terminal When the liquid level of the heat medium falls below the lower limit level during operation that exceeds a certain time, the heat medium leak is judged, so the heat medium leak detection is not performed within a certain time after starting the heating operation. With this process, it is possible to prevent erroneous detection of air bleed due to overflow as a heat medium leak, and by detecting the heat medium leak within a certain period of time after the start of heating operation, it is determined by the conventional operation downtime Rather than Those that can prevent erroneous detection made determination probability.
[0036]
In the invention of claim 3 of the present invention, the elapsed time from the detection of the operation signal from the heating terminal until the liquid level of the heating medium falls to the lower limit level, or the liquid level of the heating medium from the upper limit level to the lower limit level. When the elapsed time until the liquid level of the heat medium in the heat medium tank falls within a certain time as described above is provided without repeating the replenishment process without performing the heat medium leak determination. If the elapsed time when the liquid level of the heat medium in the heat medium tank falls as described above is a certain time or more, the leakage of the heat medium is judged, so the time until the liquid level of the heat medium reaches the lower limit level is monitored. This makes it possible to distinguish between a heat medium drop and a heat medium leak, and even if the heat medium is dropped and the heat medium is replenished, it can be prevented from erroneously detecting a heat medium drop and stopping the error. Also, the elapsed time for the liquid level of the heat medium to fall to the lower limit level is predetermined When less during that does not detect the heat medium leakage, but which can prevent erroneous detection by accurately determine than determined by conventional operational downtime.
[Brief description of the drawings]
FIG. 1 is a schematic system diagram showing an entire heating apparatus.
FIG. 2 is an explanatory view for explaining the operation of the heat medium tank when the heat medium leaks.
FIG. 3 is an explanatory view for explaining the operation of the heat medium tank when the heat medium is dropped.
FIG. 4 is a flowchart of an example of an embodiment of the present invention.
[Explanation of symbols]
1 Circulation path 5 Heat medium tank 6 Heating terminal

Claims (3)

A heating medium leakage false detection prevention method for a heating apparatus for heating by circulating a heated heat medium through a circulation path to a heating terminal,
Processing to determine whether the level of the heat medium in the heat medium tank provided in the middle of the circulation path is equal to or higher than a predetermined upper limit level and whether the liquid level in the heat medium tank is equal to or lower than a predetermined lower limit level When,
When the liquid level of the heating medium is lower than the lower limit level, a process of replenishing the heating medium to a predetermined upper limit level in the heating medium tank;
The number of times of replenishing the heat medium or the number of times the liquid level of the heat medium reaches a predetermined lower limit level (the number of times of replenishing the heat medium or the number of times of the liquid level of the heat medium reaching a predetermined lower limit level is hereinafter simply referred to as the number of replenishments) A process for determining a heat medium leak when the number of times exceeds a certain number of times,
A process of determining whether or not the state where the liquid level of the heat medium is equal to or higher than a predetermined upper limit level is equal to or longer than a predetermined time;
If the heat medium falls below the predetermined lower limit level in the operation after the state where the liquid level of the heat medium is equal to or higher than the predetermined upper limit level for a predetermined time or longer, the replenishment process is performed without performing the heat medium leakage determination. Repeatedly, if the heat medium is below a predetermined lower limit level in the operation after the state where the liquid level of the heat medium is not lower than the predetermined upper limit level does not continue for a predetermined time or longer, the leakage of the heat medium is determined. A heating medium leak detection error prevention method for a heating device. A heating medium leakage false detection prevention method for a heating apparatus for heating by circulating a heated heat medium through a circulation path to a heating terminal,
Processing to determine whether the level of the heat medium in the heat medium tank provided in the middle of the circulation path is equal to or higher than a predetermined upper limit level and whether the liquid level in the heat medium tank is equal to or lower than a predetermined lower limit level When,
When the liquid level of the heating medium is lower than the lower limit level, a process of replenishing the heating medium to a predetermined upper limit level in the heating medium tank;
A process for determining a heat medium leak when the number of replenishment times exceeds a certain number;
A means for counting the time elapsed since the operation signal of the heating terminal was detected, and the liquid level of the heat medium is the lower limit level during operation within a certain time after the operation signal from the heating terminal is received. If it is below, repeat the above replenishment process without performing the heat medium leak determination, and the level of the heat medium is the lower limit in the operation when the elapsed time after the operation signal from the heating terminal has exceeded a certain time A heating medium leakage false detection prevention method for a heating apparatus, characterized in that, when the level falls below the level, the determination of the heating medium leakage is performed. A heating medium leakage false detection prevention method for a heating apparatus for heating by circulating a heated heat medium through a circulation path to a heating terminal,
Processing to determine whether the level of the heat medium in the heat medium tank provided in the middle of the circulation path is equal to or higher than a predetermined upper limit level and whether the liquid level in the heat medium tank is equal to or lower than a predetermined lower limit level When,
When the liquid level of the heating medium is lower than the lower limit level, a process of replenishing the heating medium to a predetermined upper limit level in the heating medium tank;
A process for determining a heat medium leak when the number of replenishment times exceeds a certain number;
Provided with a means to count the elapsed time from when the operation signal from the heating terminal is detected until the liquid level of the heating medium drops to the lower limit level, or the elapsed time until the liquid level of the heating medium falls from the upper limit level to the lower limit level ,
If the elapsed time when the level of the heat medium in the heat medium tank falls as described above is within a certain time, the replenishment process is repeated without performing the heat medium leak determination, and the liquid of the heat medium in the heat medium tank is determined. A heating medium leakage false detection prevention method for a heating apparatus, wherein the leakage of the heating medium is determined when the elapsed time when the position is lowered as described above is a certain time or more.

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