JP5957412B2 - Hot air heater - Google Patents

Description

  The present invention relates to a hot air heater such as an oil fan heater, for example, and relates to a hot air heater provided with a heating load control device that corrects the number of heating load stages.

  Conventional warm air heaters are known that perform control to add the heating load correction amount calculated based on the rising gradient of the detected room temperature at the start of the previous heating operation to the heating load of the current heating operation. (Patent Document 1). By performing such control, operation with a heating load suitable for the size of the room in which the hot air heater is installed can be performed, so that the room temperature is quickly raised to reach the set temperature.

JP-A-6-347032

  However, when the outside air temperature is low or the floor or wall of the room where the hot air heater is installed is cold, the temperature rise gradient in the room is small, and the environment where the hot air heater is actually used is It changes little by little each time. In other words, the usage environment may have changed at the start of the previous operation and at the start of the current operation, and the heating load considering the temperature increase gradient at the start of the previous operation alone cannot cope with the difference in temperature increase. In some cases, the room warms up insufficiently, and it takes a long time from the start of operation until the room temperature reaches the set temperature. Therefore, the user cannot feel a sufficient feeling of heating.

  An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a warm air heater capable of performing an optimum heating load correction considering the difference in use environment and quickly raising the temperature to a set temperature. To do.

  The present invention includes a temperature detection means for detecting a room temperature, a temperature setting means for setting a heating room temperature, and a heating load control means for controlling the operation by calculating the number of heating load stages from the difference between the set temperature and the detected temperature. In the hot air heater, when the operation with the maximum heating load for a predetermined time or longer from the start of operation is performed, the initial maximum heating load operation is performed. The amount of offset that increases or decreases to the number of heating load stages at the start of the operation is determined, and after the initial maximum heating load operation, the offset amount that increases or decreases to the number of heating load stages is corrected in a predetermined cycle It is related to.

  The heating load control means includes a time measuring means for measuring the operation time and the operation stop time, and the heating load control means reaches the set temperature when the detected temperature does not reach the set temperature by the predetermined time t1 from the start of operation. 2. The hot air heater according to claim 1, wherein the offset amount to be added to the number of heating load stages is increased as compared with the case, and the cycle for correcting the offset amount is also shortened.

  Further, the heating load control means determines the size of the room in which the hot air heater is installed according to whether or not the temperature increase gradient in the previous initial maximum heating load operation exceeds a predetermined temperature, and the determination result The offset amount to be added to the number of heating load stages is determined from a preset offset amount pattern by a combination of the difference between the set temperature at the start of operation and the detected temperature. This relates to the hot air heater described in the above.

  Further, the heating load control means continues the control for correcting the offset amount performed before the previous operation stop when the heating load control means is restarted before the predetermined time t2 has elapsed since the previous operation stop. The present invention relates to the hot air heater according to any one of claims 1 to 3.

  In addition, the heating load control means, when the operation is restarted after a predetermined time t3 longer than the predetermined time t2 has elapsed since the previous operation stop, compared with the case where the heating load control means is restarted before the predetermined time t3 elapses. 5. The hot air heater according to claim 1, wherein the offset amount to be added to the number of heating load stages is increased and the cycle for correcting the offset amount is also shortened. 6.

  With the above-described configuration, by setting an offset amount to be added to the number of heating load stages from the temperature rise gradient in the previous initial maximum heating load operation, the heating load control suitable for the size of the room can be performed and the temperature rise If there is not enough, it is possible to control the operation according to the influence of outside air temperature and whether the floor and walls of the room are cold by adjusting the offset amount as needed in consideration of the actual temperature rise gradient. Can reach room temperature.

It is a schematic explanatory drawing which shows the operation part of this invention, a control part, and a combustion part. It is a graph explaining thermal power calculation in control of the present invention. It is a figure explaining the initial large thermal power driving | operation in control of this invention. It is a pattern table for determining the amount of offset added to basic heat power at the time of the start of operation in the control of the present invention. It is a table | surface explaining the correction control of the offset amount after completion | finish of the initial large thermal power driving | operation in the control of this invention. It is a table | surface explaining the correction control of offset amount when room temperature does not reach setting temperature by predetermined time t1 progress in control of this invention.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode of the present invention, which is considered preferable, will be briefly described by showing the effects of the present invention.

  The warm air heater according to the present invention has an offset amount to be added to the number of heating load stages at the start of the current operation determined from the data of the temperature increase gradient in the previous initial maximum heating load operation. The offset amount is corrected at a period of. That is, not only adding the offset amount determined based on the data during the previous operation to the number of heating load stages, but also determining the magnitude of the temperature rise during the current operation, and the offset amount as needed is determined based on the determination result. The correction is made so as to increase or decrease.

  As a result, heating operation is performed with the number of heating load stages suitable for the size of the room where the hot air heater is installed by adding the offset amount determined from the data at the previous operation, but the influence of the outside air temperature and the room If the room is not warm enough due to the feeling of bottom cooling, the room temperature can be quickly raised by increasing the amount of offset and increasing the number of heating load stages.

  Further, when the detected temperature does not reach the set temperature from the start of operation until the predetermined time t1, it is determined that the use environment is unlikely to increase in temperature, and the operation is performed with a larger offset amount added to the number of heating load stages. By accelerating the temperature rise and shortening the correction period of the offset amount, the magnitude of the temperature rise is closely monitored and reflected in the offset amount at any time, so it can approach the set temperature in a short time . Furthermore, by correcting in a short cycle, as soon as it is detected that the set temperature has been approached by increasing the offset amount, the offset amount can be reduced to reduce the number of heating load stages, and excessive heating can be suppressed. .

  In addition, the offset amount can be easily calculated by setting the corresponding offset amount as a pattern in advance from the combination of the determination result of the room size and the difference between the set temperature and the detected temperature at the time of determination. In addition, since a complicated arithmetic expression is not required for calculating the offset amount, the load on the microcomputer is reduced.

  In the case of re-operation before the predetermined time t2 has elapsed since the previous operation stop, it is determined that the operating environment of the warm air heater has not changed since the time has not elapsed since the previous operation stop. Since the control for correcting the offset amount performed before the stop is continued, the operation is continued, so that it is not necessary to perform a wasteful operation control such as re-setting the control for correcting the offset amount based on the judgment. Less load.

  In addition, when the operation is restarted after a predetermined time t3 longer than the predetermined time t2 since the previous operation stop, it is determined that the room is sufficiently cooled, and the offset amount to be added to the heating load stage number is increased. Since the temperature rise is accelerated by operating the motor and the period for correcting the offset amount is shortened, the magnitude of the temperature rise is closely monitored and reflected in the offset amount as needed. Can be approached. On the other hand, when re-running without waiting for the elapse of the predetermined time t3, it was judged that the room floor and wall were not yet cooled down and it took no time to reach the set temperature, and excessive warming was suppressed. You can drive.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic explanatory view of an oil fan heater which is an example of a hot air heater according to the present invention, an operation unit 1 having a switch or the like operated by a user, a control unit 2 for controlling operation, and burning liquid fuel. A combustion unit 3 is provided. The control unit 2 is constituted by a microcomputer, and has a heating power control means 4 for controlling the combustion heating power and a time measuring means 5 as a heating load control means. The time measuring means 5 is for measuring the time during which the hot air heater is operating or stopped. On the other hand, the combustion unit 3 is configured to supply the liquid fuel to the vaporizer 8 by an electromagnetic pump 7 provided on the upper part of the oil tray 6 in which the liquid fuel is stored, and the burner 9 converts the liquid fuel vaporized inside the vaporizer 8. It is configured to erupt toward.

  An operation switch 10, a temperature setting switch 11, and a temperature sensor 12 arranged in the operation unit 1 are connected to the input side of the thermal power control means 4. Further, an electromagnetic pump 7 and a vaporizer 8 are connected to the output side of the thermal power control means 4.

  In the case of performing the heating operation of the hot air heater configured as described above, when the user starts the operation by pressing the operation switch 10 of the hot air heater, the thermal power control means 4 drives the electromagnetic pump 7 to vaporize. Fuel is supplied to the device 8. The vaporizer 8 heats and vaporizes the supplied liquid fuel with a built-in heater, and the vaporized gas is jetted to the burner 9 to ignite to start combustion. Further, based on the difference between the set temperature set by the temperature setting switch 11 and the room temperature detected by the temperature sensor 12, the thermal power control means 4 determines the thermal power stage number as the heating load stage number, and the electromagnetic pump 7 based on this thermal power stage number. The flow rate of the liquid fuel is controlled by adjusting the pump flow rate to control the amount of liquid fuel supplied. If the difference between the set temperature and the room temperature is large immediately after the start of the combustion operation, the combustion operation is performed at a constant large heating power for a while to increase the room temperature, and the initial maximum heating load operation is started. Large thermal power operation is performed.

  FIG. 2 is a graph for explaining calculation of the number of thermal power stages controlled in the heating operation of the hot air heater. The horizontal axis shows the temperature difference between the set temperature set by the temperature setting switch 11 and the room temperature detected by the temperature sensor 12, and the vertical axis shows the thermal power controlled by the thermal power control means 4 during operation of the hot air heater. The number of stages is shown. The thermal power control means 4 actually calculates the sum of the basic thermal power calculated from the temperature difference between the set temperature and the room temperature and the offset amount that compensates for the insufficient thermal power when the basic thermal power is insufficient to warm the room. Determine the number of thermal power stages to be operated. The thermal power control means 4 drives the electromagnetic pump 7 and the vaporizer 8 with the number of thermal power stages determined at this time.

  As an offset amount to be added to the basic thermal power, an initial offset amount set in advance in the control unit 2 at the time of shipment is used at the first operation after power-on. Further, during the second and subsequent operations after the power is turned on, the offset amount calculated from the temperature rise gradient detected during the previous initial large thermal power operation is used.

  FIG. 3 is a diagram illustrating the initial large thermal power operation. The thermal power stage number is calculated by the sum of the basic thermal power and the offset amount. However, when the basic thermal power immediately after the start of operation is large, the thermal power stage number may exceed the large thermal power, and the actual operation is performed with a constant large thermal power. become. When the room temperature rises as the operation time elapses, the basic thermal power calculated by the difference between the set temperature and the room temperature decreases, the number of thermal power stages after point A in FIG. 3 falls below the large thermal power, and the operation with a constant large thermal power is completed. Therefore, the period from the start of operation to point A is referred to as initial large thermal power operation.

  Here, a method of calculating the offset amount added to the basic thermal power will be described. The thermal power control means 4 determines the size of the room in which the hot air heater is installed in accordance with whether or not the temperature rise gradient is larger than a preset temperature difference in the previous initial large thermal power operation. The offset amount to be used at the start of the current operation is determined from the preset offset amount pattern based on the combination of the determination result and the difference between the set temperature at the time of determination and the room temperature.

  FIG. 4 is a pattern table for determining an offset amount to be added to the basic thermal power at the start of operation. The thermal power control means 4 determines whether the room size is narrow or wide depending on whether or not the increase in room temperature X seconds after the start of combustion exceeds 1.5 ° C. The set temperature and room temperature at the start of operation are determined. Depending on the difference, it is further divided into patterns as the coldness of the room. As a result, each pattern corresponds to the difficulty of warming up the room, which is estimated by a combination of the size of the room and the coldness of the room. An offset amount necessary for promptly reaching the set temperature corresponding to each pattern is set in advance.

  For example, when the set temperature is 20 ° C., the difference between the set temperature at the start of operation and the room temperature is 13 ° C., and the room temperature increase X seconds after the start of combustion is 1.2 ° C. The temperature difference corresponds to “12 ° C. or more and less than −18 ° C.” from FIG. Furthermore, since the room temperature rise is less than 1.5 ° C., the room size is determined as a “wide” room in which the temperature does not rise easily. Therefore, the pattern “4” is determined based on the combination of the room cooling condition and the room size. The offset amount to be added to the basic thermal power is determined as “+25”.

  Thus, the offset amount determined in the initial large thermal power operation is recorded by the control unit 2, and the thermal power control means 4 uses the previously determined offset amount as the offset amount added to the basic thermal power at the start of the current operation. . Further, when the offset amount is newly calculated from the temperature increase gradient during the initial initial thermal power operation, the offset amount is changed to the newly calculated one.

  Next, when the initial large thermal power operation is completed, the thermal power control means 4 corrects the offset amount at a predetermined cycle. The offset correction amount set in advance is increased or decreased from the temperature difference between the room temperature and the set temperature detected at predetermined intervals.

  FIG. 5 is a table for explaining offset amount correction control after completion of the initial large thermal power operation. For example, as shown in FIG. 5, when the room temperature is 3 ° C. lower than the set temperature, “+1” is added to the offset amount as the offset correction amount. In addition, during the control of FIG. 5, the cycle for correcting the offset amount is changed before and after reaching the set temperature, and after reaching the set temperature, the correction amount is shortened and the offset amount is finely corrected to set the set temperature. Adjust so that it is not too warm.

  Furthermore, it is possible to determine whether the room where the hot air heater is installed is in an environment where it is difficult for the room temperature to rise by whether or not the set temperature has been reached by the lapse of a predetermined time from the start of operation, so that the temperature can be quickly raised. The offset correction amount is varied.

  If the room temperature has reached the set temperature at the time when the predetermined time t1 has elapsed since the start of operation, how to warm up sufficiently with the number of thermal power stages in operation for the environment in which the hot air heater is used Since it can be determined that it is shown, the control of FIG. 5 is continued. On the other hand, when the room temperature does not reach the set temperature even after the predetermined time t1 has elapsed since the start of operation, the room temperature is unlikely to rise due to the influence of the outside air temperature or the room floor or wall being cold. Since it can be determined that the method of heating is insufficient with the number of thermal power stages during operation, the temperature rise is accelerated by switching to the control of FIG. 6 in which the offset correction amount is larger than the control of FIG. In the control after reaching the set temperature, the thermal power adjustment is performed so that the room temperature does not greatly exceed the set temperature, and therefore there is no difference in the offset correction amount of the control in FIGS.

  For example, when the room temperature is 3 ° C. lower than the set temperature by the control of FIG. 5 until the predetermined time t1 has elapsed, only “+1” is added to the offset correction amount, but the set temperature cannot be reached even after the predetermined time t1 has elapsed. If the temperature difference is also 3 ° C. lower, the control shown in FIG. 6 is performed to accelerate the temperature rise, and the offset correction amount is greatly added to “+3”.

  In addition, since the increase in the room temperature can be closely monitored by making the offset correction period shorter than the control in FIG. 5 before reaching the set temperature, the thermal power required to reach the set temperature is changed to the offset amount as needed. Reflected. As a result, the offset amount is increased to accelerate the temperature rise, and immediately before or after reaching the set temperature, the offset amount is quickly reduced so that the offset temperature is not overheated.

  Further, the control of FIG. 5 or FIG. 6 determined when the predetermined time t1 has elapsed is performed until the operation of the hot air heater is stopped. In other words, if the room temperature does not reach the set temperature even after the predetermined time t1 has elapsed, it is determined that the room temperature is unlikely to rise. Similarly, even when the room temperature rapidly decreases for a reason, it is difficult to increase the room temperature. Therefore, by continuing the control of FIG. 6 having a large offset amount, even if the room temperature decreases, the room temperature increases again in a short time. It can be done.

  The time measuring means 5 measures the elapsed time from when the operation of the hot air heater is stopped until the next operation start operation is performed. When the operation operation is performed, the thermal power control means 4 is restarted. It is determined whether or not a predetermined time t2 has elapsed before the operation. For example, if the predetermined time t2 is set to 20 minutes, if the re-operation is performed during this period, the time has not passed since the previous operation stop, so the room is still warm and the outside air temperature Since the effect is almost unchanged, it is presumed that there is no change in how the room is warmed. As a result, there is no need to re-set the correction control of the offset amount at the time of re-operation, so that the offset amount correction control of FIG. 5 or FIG. I do.

  If the re-operation has not been performed after the elapse of the predetermined time t2, it is next determined whether or not the predetermined time t3 has elapsed. When the re-operation is performed during the period from the predetermined time t2 to the predetermined time t3, it is presumed that the floor and walls of the room are not yet cooled, and it takes less time to reach the set temperature. The thermal power control means 4 performs the control shown in FIG. 5 after the initial large thermal power operation. On the other hand, when a re-operation is performed after the elapse of the predetermined time t3, it is estimated that a considerable time has elapsed since the previous operation stop and the room has been cooled down. The operation shown in FIG. 6 is performed after the end of the initial large thermal power operation, and the operation is performed so as to reach the set temperature in a short time.

  Furthermore, it is determined whether or not the room temperature has reached the set temperature when a predetermined time t1 has elapsed from the start of re-operation, and the control of FIG. 5 or FIG. Decide whether to continue or change control.

  With the above control, the room can be warmed quickly, and after the room has warmed up to around the set temperature, the offset can be corrected to prevent overheating, so the effects of room size and outside temperature are taken into account. You can get comfortable heating.

  In this embodiment, the explanation is made by using a combustion device such as an oil fan heater as an example. However, the present invention is not limited to this, and heating load control is performed according to the difference between the set temperature and the room temperature, such as an air conditioner. It is also used in other hot air heaters that perform.

4 Thermal power control means (heating load control means)
5 Timekeeping means 11 Temperature setting switch (Temperature setting means)
12 Temperature sensor (temperature detection means)

Claims (5)

  A hot air heater comprising temperature detecting means for detecting a room temperature, temperature setting means for setting a heating room temperature, and heating load control means for calculating and controlling a heating load stage from the difference between the set temperature and the detected temperature The initial maximum heating load operation is performed when the operation with the maximum heating load for a predetermined time or more from the start of operation is performed, and the heating load control means is configured to start the current operation from the temperature rise gradient in the previous initial maximum heating load operation. A warm air heater characterized by determining an offset amount to be increased or decreased to the number of heating load stages, and correcting the offset amount to be increased or decreased to the number of heating load stages at a predetermined cycle after the initial maximum heating load operation is completed.   A time measuring means for measuring the operation time and the operation stop time, and the heating load control means, when the detected temperature does not reach the set temperature by the predetermined time t1 from the start of operation, 2. The warm air heater according to claim 1, wherein the offset amount to be added to the number of heating load stages is increased, and the correction period of the offset amount is also shortened.   The heating load control means determines the size of the room in which the hot air heater is installed according to whether or not the temperature increase gradient in the previous initial maximum heating load operation exceeds a predetermined temperature, and the determination result and operation The offset amount to be added to the number of heating load stages is determined from a preset offset amount pattern by a combination of a difference between the set temperature at the start and the detected temperature. The hot air heater described.   The heating load control means continues the control for correcting the offset amount performed before the previous operation stop when the heating load control means is restarted before the predetermined time t2 has elapsed since the previous operation stop. Item 4. The hot air heater according to any one of Items 1 to 3.   When the heating load control means is restarted after a predetermined time t3 longer than the predetermined time t2 has elapsed since the previous stop of operation, the heating load control means is compared with the heating load compared with the case of restarting before the predetermined time t3 has elapsed. The hot air heater according to any one of claims 1 to 4, wherein an offset amount to be added to the number of stages is increased and a cycle for correcting the offset amount is also shortened.

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