KR20220098603A - Blower - Google Patents

Abstract

The present invention relates to a blower. The blower includes: a housing including an inlet sucking air and an outlet discharging the air; a heater heating by being arranged in the housing; a fan arranged in the upper part of the heater and causing the flow of the air to the heater; a temperature sensor installed in the housing and measuring the temperature of the heater; a switch electrically connected to the heater and supplying or blocking power to the heater; and a control unit blocking power supply to the heater for a first time when the temperature measured by the temperature sensor is equal to or higher than a setting temperature, and controlling operation of the switch in a first cycle supplying the power to the heater for a second time. The control unit blocks the power supply to the heater for a third time when the temperature measured by the temperature sensor in the first cycle is equal to or higher than the setting temperature. The control unit also changes the first cycle to a second cycle supplying the power to the heater for a fourth time to control the operation of the switch. A ratio of the first time to the second time is less than the ratio of the third time to the fourth time. The blower can effectively prevent overheating of the heater.

Description

blower {BLOWER}

The present invention relates to a blower, and more particularly, to a blower for preventing overheating of a heater through on-off control of a switch.

A blower refers to a blower that pressurizes gas by the rotational movement of the fan. The heater may be built into the blower to heat the air sucked into the blower by the fan, and the blower may provide warm air to a user or the like.

Meanwhile, Korean Patent No. 10-1693154 discloses a hot air blower that prevents overheating of equipment by controlling the discharge amount of air heated by a heater. However, since the operation of the heater is maintained at a high temperature, there is a problem in that it is easy to cause thermal deformation of the configuration around the heater. In addition, when the air intake port is blocked by an external factor such as an obstacle, there is a problem in that the heater is overheated when a sufficient amount of air to prevent overheating of the heater does not flow into the hot fan.

In addition, Korean Patent No. 10-1982781 discloses a control method for periodically turning on/off the power of an electric range for cooking food. However, there is a problem that several foods cannot be cooked by a single control method in that the power on-off cycle for a specific capacity of a specific food must be set in advance. There is a problem that cannot cope with overheating.

In addition, the conventional means for preventing overheating through the power-off control has a problem in that the performance of the blower is deteriorated because the temperature of the heater is reduced below the minimum temperature for ensuring performance due to the power-off control.

1. Registered Patent Publication No. 10-1693154

2. Registered Patent Publication 10-1982781

An object of the present invention is to provide a blower capable of preventing overheating of a heater.

Another object of the present invention is to provide a blower capable of preventing overheating of a heater in response to an amount of air introduced into the blower or a change in temperature of the heater.

Another object of the present invention is to provide a blower that prevents overheating of the heater and secures the minimum amount of heat of the heater.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A blower according to an embodiment of the present invention for achieving the above technical problem is a housing having an inlet through which air is sucked and an outlet through which air is discharged, disposed inside the housing, a heater capable of generating heat, air to pass through the heater If the temperature measured by the fan, the temperature sensor installed in the housing to measure the temperature of the heater, a switch electrically connected to the heater to supply or cut off power to the heater, and the temperature sensor is higher than the set temperature , a control unit for controlling the switch in a first cycle of supplying power to the heater for a first time and supplying power to the heater for a second time period, wherein the control unit includes the temperature sensor within the first cycle If the measured temperature is equal to or greater than the set temperature, controlling the operation of the switch in a second cycle of supplying power to the heater for a third time in the first cycle and supplying power to the heater for a fourth time, , the ratio of the first time to the second time is less than the ratio of the third time to the fourth time.

In order to achieve the above technical object, if the temperature measured by the temperature sensor within the second period is less than or equal to the minimum temperature, the controller supplies power to the heater for a fifth time, and supplies power to the heater for a sixth time The driving of the switch may be controlled in a third period of cutting off the supply, and a ratio of the fourth time to the third time may be smaller than a ratio of the fifth time to the sixth time.

In order to achieve the above technical task, the temperature sensor measures the rate of change of temperature with respect to time, and the controller is configured to measure the rate of change of the temperature with respect to time, and the control unit is the first period to increase the second time compared to the first time when the rate of change is smaller than the reference rate of change. can be changed

In order to achieve the above technical object, when the measured rate of change is greater than a reference rate of change, the controller may change the first period to increase the first time compared to the second time.

In order to achieve the above technical problem, an air flow meter for measuring the flow rate of air flowing to the heater by the fan is installed downstream of the suction port, and the controller is configured to control the second flow rate when the measured flow rate is smaller than the reference flow rate. The first period of the heater may be changed to increase the first time compared to the time.

In order to achieve the above technical problem, the switch may be provided as a silent relay for reducing noise generated in the driving process.

In order to achieve the above technical object, the temperature sensor may be in contact with an area adjacent to the outlet among the surfaces of the heater.

In order to achieve the above technical task, an intake air temperature sensor is installed downstream of the intake port to measure the temperature of the air introduced into the intake port, and the control unit determines that the temperature measured by the intake air temperature sensor is smaller than the standard temperature, The amount of power supplied to the heater may be controlled to increase.

In order to achieve the above technical problem, when the temperature measured by the intake air temperature sensor is greater than the standard temperature, the controller may control the amount of power supplied to the heater to decrease.

The blower control method according to an embodiment of the present invention for achieving the above technical problem includes the steps of supplying power to a heater to heat the heater, measuring the temperature of the heater with a temperature sensor, the temperature measured by the temperature sensor controlling the power supplied to the heater in a first cycle of cutting off power supply to the heater for a first time period and supplying power to the heater for a second time period when is equal to or greater than the set temperature, within the first cycle Measuring the temperature of the heater with a temperature sensor and if the temperature of the heater measured by the temperature sensor within the first period is equal to or higher than the set temperature, cut off the power supply to the heater for a third time and for a fourth time and controlling the power supplied to the heater in a second period of supplying power to the heater, wherein the ratio of the first time to the second time is greater than the ratio of the third time to the fourth time. small.

In order to achieve the above technical task, measuring the temperature of the heater with the temperature sensor within the second period and if the temperature of the heater measured by the temperature sensor within the second period is less than or equal to the minimum temperature, a fifth time and controlling the power supplied to the heater in a third period of supplying power to the heater during a period of time and cutting off the power supply to the heater for a sixth time, and the ratio of the fourth time to the third time. may be less than a ratio of the fifth time to the sixth time.

In order to achieve the above technical task, the temperature sensor measures the rate of change of the temperature of the heater with respect to time and if the rate of change measured by the temperature sensor is less than the reference rate of change, the second time is increased compared to the first time It may include changing the first period so as to

In order to achieve the above technical problem, when the rate of change measured by the temperature sensor is greater than the reference rate of change, the first period may be changed to increase the first time compared to the second time.

In order to achieve the above technical problem, the step of measuring the flow rate of air passing through the heater and if the measured flow rate is less than the reference flow rate, change the first period to increase the first time compared to the second time can

In order to achieve the above technical task, measuring the temperature of the air flowing into the heater and if the temperature of the air flowing into the heater is lower than the standard temperature, increasing the amount of power supplied to the heater can

In order to achieve the above technical problem, when the temperature of the air introduced into the heater is greater than the standard temperature, the method may include reducing the amount of power supplied to the heater.

The blower according to an embodiment of the present invention can prevent overheating of the heater by periodically shutting off the power supplied to the heater through a switch.

In addition, it is possible to effectively prevent overheating of the heater by resetting the cutoff period of power supplied to the heater based on the air volume and the rate of change in temperature of the heater.

In addition, by resetting the power-off cycle to the heater so that the temperature of the heater is maintained at or above the minimum temperature, deterioration of the performance of the blower can be prevented.

In addition, there is an effect of preventing local overheating of the heater by contacting the temperature sensor to the hottest area among the surfaces of the heater.

1 shows a perspective view of a blower according to a first embodiment of the present invention.
FIG. 2 is a right sectional view of the blower of FIG. 1 .
3 is a perspective view of a heater according to a first embodiment of the present invention.
4 is a top view of a heater according to a second embodiment of the present invention.
5 and 6 are block diagrams of a control method according to the first embodiment of the present invention.
7 is a graph showing the temperature measured by the temperature sensor.
8 is experimental data showing the temperature measured by the temperature sensor.

The suffixes "unit" and "unit" for the components used in the following description are given or used in consideration of ease of writing the specification only, and do not have a meaning or role distinct from each other by themselves.

In addition, when it is determined that a detailed description of a related known technology may obscure the gist of the embodiment invented in this specification in describing the embodiments disclosed herein, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments invented in the present specification, and the technical idea invented in this specification is not limited by the accompanying drawings, and is included in the spirit and scope of the present invention. It is to be understood as including all modifications, equivalents and substitutions.

Terms including ordinal numbers such as first, second, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “coupled” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is mentioned that a certain element is "directly connected" or "directly coupled" to another element, it should be understood that the other element does not exist in the middle.

The singular expression may include the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as “may include” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification is present, and one or more It should be understood that this does not preclude the possibility of addition or presence of other features or numbers, steps, operations, components, parts, or combinations thereof.

Referring to FIG. 1 , the blower 1 includes a housing 10 having an inlet 11 through which air is sucked and an outlet 15 through which air is discharged, and a heater 20 disposed inside the housing 10 and capable of generating heat. ) may be included.

The housing 10 may have an inlet 11 and an outlet 15 formed therein. The bet may be sucked through the suction port 11 , and the suctioned bet may be discharged into the room through the discharge port 15 . The inlet 11 may be formed on the lower outer surface of the housing 10 . It is not limited to the front or rear by the suction port 11 is formed in the form surrounding the outer surface, it is possible to suck the bet in the entire horizontal direction. The discharge port 15 may be formed in the form of an elongated slit. It is possible to discharge the bet sucked in a larger area through the discharge port 15 extending in the longitudinal direction.

The heater 20 may heat the bet sucked into the suction port 11 . When power is supplied to the heater 20, the heater 20 generates heat at a high temperature, and the heater 20 heats the sucked bet by heat exchange with the sucked bet. The heater 20 may be provided as a sheath heater.

1 and 2, the blower (1) is installed downstream of the inlet 11, the intake air temperature sensor (12) for measuring the temperature of the air (a) flowing into the inlet (11), a heater (20) A fan 30 for pressurizing air (a) to pass through, a motor 31 connected to the fan 30 to transmit driving force, a fixing part 24 for fixing the heater 20 to the housing 10, a suction port ( 11) installed downstream and may include an air flow meter 25 for measuring the flow rate of air (a) flowing to the heater 20 by the fan 30 .

The intake air temperature sensor 12 may measure the temperature of the air (a) sucked into the blower 1 through the suction port 11 . The temperature of the air (a) flowing into the blower (1) may change due to an external factor such as a change of season or an air conditioning means outside the blower (1). If the amount of heat generated by the heater 20 is controlled based on the temperature information measured by the intake air temperature sensor 12 , the temperature of the discharged air (a) can be constantly maintained in response to the temperature of the intake air (a).

The fixing part 24 may be coupled to both ends of the heater 20 to fix the heater 20 to the inside of the housing 10 . The fixing part 24 may include a first bracket 24a and a second bracket 24b. Each of the first bracket 24a and the second bracket 24b may fix the heater 20 in the housing 10 by connecting the housing 10 and the heater 20 . In addition, a circuit connected to the heater 20 through the first bracket 24a or the second bracket 24b may pass.

The air volume meter 25 may measure the flow rate of the air (a) flowing to the heater 20 . When the suction port 11 is blocked by an obstacle or the like, the flow rate of the air (a) sucked into the blower 1 may be smaller than the reference flow rate. At this time, since the amount of heat exchange between the heater 20 and the sucked air (a) is reduced due to the decrease in the flow rate, the heater 20 may be overheated and the temperature of the discharged air (a) may rise. Therefore, if the amount of heat generated by the heater 20 is controlled based on the flow rate information measured by the air flow meter 25, overheating of the heater 20 can be prevented, and the temperature of the discharged air a can be maintained constant. .

The fan 30 may be provided as a centrifugal fan, a four-flow fan, an axial fan, or the like. The fan 30 is connected to the motor 31 , and the motor 31 may transmit a driving force to the fan 30 and control the driving of the fan 30 . The fan 30 and the motor 31 may be disposed in the housing 10 . When the motor 31 operates, the fan 30 rotates, and the air (a) is sucked into the suction port 11 by the rotation of the fan 30 . The sucked air (a) is pressurized by the fan 30 , flows to the heater 20 , and is discharged into the room through the outlet 15 . By supplying power to the heater 20 to heat the heater 20 , warm air may be discharged through the outlet 15 .

1 to 3 , the blower 1 is installed in the housing 10 and is electrically connected to the temperature sensor 40 for measuring the temperature of the heater 20 and the heater 20 to supply power to the heater 20 . A control unit that receives the temperature information measured by the switch 50 that supplies or cuts off the temperature sensor 40 and controls the switch 50 to periodically cut off the power supplied to the heater 20 based on the received temperature information. (not shown) may be included.

The temperature sensor 40 may measure the temperature change rate of the heater 20 with respect to the temperature and time of the heater 20 . For example, the temperature of the heater 20 is measured twice through the temperature sensor 40 at a predetermined time interval, and the value obtained by dividing the difference between the two measured temperatures by the predetermined time interval is divided by the time interval of the heater 20 It can be calculated as the rate of temperature change of

The switch 50 may be disposed in a power supply circuit connected to the heater 20 . When the switch 50 is driven, the power supply circuit can be opened and closed, and power to the heater 20 can be cut off and supplied through this. Meanwhile, the switch 50 may be provided as a relay. A relay is a device that operates when an input reaches a certain value to open and close other circuits. In particular, the switch 50 may be provided as a silent relay. By installing a silent relay, noise generated during the driving process can be reduced.

The controller (not shown) may receive information on the temperature change rate of the heater 20 with respect to the temperature and time of the heater 20 from the temperature sensor 40 . The controller (not shown) may receive temperature information of the air (a) sucked into the blower 1 from the intake air temperature sensor 12 . The controller (not shown) may receive flow rate information of the air (a) flowing from the wind meter 25 to the heater 20 . The controller (not shown) may set a cut-off period of power supplied to the heater 20 through the received information, and may control the operation of the switch 50 at a set period or a write-in period.

3 and 4 , the temperature sensor 40 may contact the surface of the heater 20 . Alternatively, the temperature sensor 40 may be disposed to be spaced apart from the surface of the heater 20 . The temperature sensor 40 can measure the temperature of the heater 20 more accurately than the case where it is spaced apart from the heater 20 by contacting the surface of the heater 20 .

On the other hand, the heater 20 is heated by receiving power and is cooled by heat exchange with the cold air (a). However, since the cold air (a) flows toward the heater 20 from one side, which is a part of the outside of the heater 20 , the surface of the heater 20 cannot be considered to have a uniform temperature distribution over the entire area. That is, the surface of the heater 20 is formed at a relatively high temperature by exchanging heat with the low-temperature surface 21, which is formed at a relatively low temperature by first exchanging heat with the cold air (a), and the air that has undergone heat exchange with the low-temperature surface 21. It may include a hot surface 22 . In particular, the high-temperature surface 22 may include an ultra-high temperature surface 22a that lastly exchanges heat with the cold air (a) flowing to the heater 20 by being located in a region adjacent to the discharge port 15 .

When the temperature sensor 40 contacts the low temperature surface 21 , the temperature sensor 40 may measure the temperature of the low temperature surface 21 . However, when the temperature of the low temperature surface 21 is lower than the maximum temperature of the allowable heater 20 and the temperature of the high temperature surface 22 is higher than the maximum temperature of the allowable heater 20, the high temperature surface 22 is Overheating may be a problem. Therefore, the temperature sensor 40 can prevent local overheating on the high-temperature surface 22 by contacting the high-temperature surface 22, in particular, in contact with the ultra-high temperature surface 22a formed at the highest temperature in the high-temperature surface 22. By doing so, it is possible to prevent local overheating in the ultra-high temperature surface 22a. By preventing local overheating, it is possible to prevent thermal deformation of the configuration around the heater 20 or malfunction of the mechanism.

The maximum temperature is a temperature that can cause thermal deformation in the surrounding configuration of the heater 20 when it continues for a long time, and may mean a temperature in a state in which the heater 20 is overheated. Therefore, it is necessary to control the power supply and cut-off to the heater 20 so that the temperature of the heater 20 is maintained below the maximum temperature.

5 and 7, the step of determining whether the temperature measured by the temperature sensor 40 is equal to or greater than the set temperature (S30), if the temperature measured by the temperature sensor 40 is equal to or greater than the set temperature, during the first time (t1) Blocking the power supply to the heater 20 and controlling the power supplied to the heater 20 in a first cycle P1 of supplying power to the heater 20 for a second time t2 (S50), Step (S50) of measuring the temperature of the heater 20 with the temperature sensor 40 within the first period (P1) and determining whether the temperature measured by the temperature sensor 40 is equal to or greater than the set temperature (S50), the first period (P1) When the temperature measured by the temperature sensor 40 in the inside is equal to or greater than the set temperature, the power supply to the heater 20 is cut off for the third time t3, and power is supplied to the heater 20 for the fourth time t4. It may include a step (S60) of controlling the power supplied to the heater 20 in two cycles (P2), wherein the ratio of the first time (t1) to the second time (t2) is the fourth time (t4) It may be smaller than the ratio of the third time t3 to .

When the user inputs a hot air signal, power is supplied to the heater 20 so that the heater 20 generates heat (S10), and the temperature sensor 40 measures the temperature of the heater 20 while the heater 20 generates heat (S10). It can be done (S20). The controller (not shown) may determine whether the temperature measured by the temperature sensor 40 is equal to or greater than the set temperature through a comparison between the temperature measured by the temperature sensor 40 and the set temperature (S30).

The set temperature may be a value experimentally determined in response to the RPM of the fan 30 , the temperature of the air a flowing to the heater 20 , the flow rate flowing to the heater 20 , and the like.

In particular, the set temperature may be a temperature less than the maximum temperature. Due to the residual heat of the heater 20 and the insensitive temperature sensing of the temperature sensor 40 , the temperature of the heater 20 may rise above the set temperature during the heating process of the heater 20 . However, when the set temperature is less than the maximum temperature, it is possible to prevent a temperature rise that may occur from residual heat of the heater 20 and insensitive temperature sensing of the temperature sensor.

At this time, when the temperature measured by the temperature sensor 40 is measured above the set temperature, the power supplied to the heater 20 may be preferentially cut off. When the power supplied to the heater 20 is cut off, the heater 20 may be cooled by exchanging heat with air flowing to the heater 20 . Thereafter, power may be supplied to the heater 20 so that the warm air is smoothly discharged to re-heat the heater 20 . As described above, by periodically cutting off the power supplied to the heater 20 , it is possible to prevent the heater 20 from being overheated.

That is, when a temperature above the set temperature is measured by the temperature sensor 40, the first time (t1) to cut off the power supply to the heater (20) and to supply power to the heater (20) for a second time (t2) By cutting off and supplying power to the heater 20 in one cycle P1, it is possible to prevent the heater 20 from being overheated (S40).

However, if a temperature equal to or greater than the set temperature is measured even during the first period P1 ( S50 ), the time for shutting off power to the heater 20 may be increased by changing the first period P1 . Accordingly, when a temperature equal to or higher than the set temperature is measured within the first period P1 , the power cut-off time may be increased compared to the power supply time to the heater 20 .

That is, the power supplied to the heater 20 may be controlled in the second cycle P2 in which the power cut-off time compared to the power supply time to the heater 20 is longer than that of the first cycle P1 . By changing the cycle from the first cycle P1 to the second cycle P2, it is possible to prevent the heater 20 from being overheated above the set temperature (S60).

On the other hand, the blower (1) control method comprises the steps of measuring the flow rate of air passing through the heater 20, and when the measured flow rate is less than the reference flow rate, the first time (t1) is increased compared to the second time (t2). Changing the first period (P1), when the measured flow rate is greater than the reference flow rate, changing the first period (P1) to increase the second time (t2) compared to the first time (t1) have.

The reference flow rate may be an arbitrary value determined experimentally in response to the RPM of the fan 30 , the temperature of the heater 20 , the temperature of the air a sucked into the blower 1 , and the like.

When the measured flow rate is smaller than the reference flow rate, the amount of heat exchange between the heater 20 and air is reduced, and thus the heater 20 may be overheated. Therefore, it is possible to prevent overheating of the heater 20 by increasing the power cut-off time compared to the power supply time to the heater 20 . In addition, when the measured flow rate is greater than the reference flow rate, the amount of heat exchange between the heater 20 and the air increases, so that the temperature of the heater 20 may decrease below the minimum temperature. Accordingly, it is possible to prevent deterioration of the performance of the blower 1 by increasing the power supply time compared to the power cut-off time to the heater 20 .

On the other hand, the blower (1) control method is a step of measuring the temperature of the air flowing into the heater (20), if the temperature of the air flowing into the heater (20) is less than the standard temperature, the amount of power supplied to the heater (20) The step of increasing, if the temperature of the air introduced into the heater 20 is greater than the standard temperature, it may include the step of reducing the amount of power supplied to the heater (20).

The standard temperature may be an experimentally determined value corresponding to the RPM of the fan 30 , the temperature of the heater 20 , the flow rate of the air a flowing to the heater 20 , and the like.

When air below the standard temperature is introduced into the heater 20, warm air may not be discharged even if it is heated by the heater 20, so the amount of power supplied to the heater 20 is increased to discharge warm air from the blower 1 can make it happen In addition, when air having a standard temperature or higher flows into the heater 20, the air overheated by the heater 20 may be discharged. can

6 and 7 , the temperature sensor 40 may measure the temperature of the heater 20 within the second period P2 and determine whether the temperature measured by the temperature sensor 40 is less than or equal to the minimum temperature (S70). ). The controller (not shown) may determine whether the temperature measured by the temperature sensor 40 is equal to or less than the minimum temperature through a comparison between the temperature measured by the temperature sensor 40 and the minimum temperature (S70).

The minimum temperature refers to the minimum temperature of the heater 20 required to secure the warm air performance of the blower 1 . The minimum temperature may be any value experimentally determined in consideration of factors such as the RPM of the fan 30 , the temperature of the heater 20 , and the flow rate to the heater 20 .

If the temperature measured by the temperature sensor 40 is less than or equal to the minimum temperature, power is supplied to the heater 20 for a fifth time t5, and the power supply to the heater 20 is cut off for a sixth time t6. It may include a step (S80) of controlling the power supplied to the heater 20 in three cycles (P3).

As the second cycle P2 in which the power cut-off time is longer than the power supply time to the heater 20 proceeds, the temperature of the heater 20 may be lowered to below the minimum temperature. When the temperature of the heater 20 is lowered below the minimum temperature, the performance of the blower 1 may be deteriorated. In particular, the ratio of the fourth time t4 to the third time t3 may be smaller than the ratio of the fifth time t5 to the sixth time t6. That is, the third cycle P3 is a cycle in which the power supply time is longer than the power cut-off time to the heater 20 compared to the second cycle P2 . By changing the power supply and cut-off cycle from the second cycle (P2) to the third cycle (P3) to make heating longer than cooling the heater 20, it is possible to prevent the temperature of the heater 20 from decreasing below the minimum temperature. can Through this, it is possible to prevent the performance degradation of the blower (1).

8 is a temperature sensor 40 when the controller (not shown) cuts off and supplies power to the heater 20 through the switch 50 to prevent overheating of the heater 20 according to the embodiment of the present invention. It is a graph showing the temperature of the heater 20 measured in.

The first curve (a1) is a curve when the power to the heater 20 is supplied for 51 seconds and the cycle is controlled to cut off for 9 seconds, and the second curve (a2) is when the power to the heater 20 is supplied for 42 seconds. And it is a curve when the control is performed in a period to cut off for 18 seconds, and the third curve (a3) is a curve when the power to the heater 20 is supplied for 35 seconds and controlled in a cycle to cut off for 25 seconds, and the fourth curve ( a4) is a curve when power is supplied to the heater 20 for 30 seconds and controlled in a cycle of shutting off for 30 seconds. Through this, it can be confirmed that overheating of the heater 20 is prevented by the blower 1 control method.

Any or other embodiments of the invention described above are not mutually exclusive or distinct. Certain or other embodiments of the present invention described above may be combined or combined in their respective configurations or functions.

For example, it means that configuration A described in a specific embodiment and/or drawings may be combined with configuration B described in other embodiments and/or drawings. That is, even if the combination between the components is not directly described, it means that the combination is possible except for the case where it is described that the combination is impossible.

The above detailed description should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

1: blower
10: housing
11: intake
15: outlet
20: heater
21, 22: low temperature side, high temperature side
25: wind meter
30: fan
40: temperature sensor
50 : switch

Claims (16)

a housing having an inlet through which air is sucked and an outlet through which air is discharged;
a heater disposed inside the housing and capable of generating heat;
a fan for pumping air through the heater;
a temperature sensor installed in the housing to measure a temperature of the heater;
a switch electrically connected to the heater to supply or cut off power to the heater; and
When the temperature measured by the temperature sensor is equal to or higher than the set temperature, a control unit for controlling the switch in a first cycle of cutting off power supply to the heater for a first time and supplying power to the heater for a second time, and ,
When the temperature measured by the temperature sensor within the first period is equal to or greater than a set temperature, the control unit cuts off power supply to the heater for a third time in the first period, and supplies power to the heater for a fourth time period to control the operation of the switch in a second cycle,
the ratio of the first time to the second time is less than the ratio of the third time to the fourth time. The method of claim 1,
If the temperature measured by the temperature sensor within the second period is less than or equal to the minimum temperature, the control unit supplies power to the heater for a fifth time and cuts off power supply to the heater for a sixth period. control the operation of the switch,
the ratio of the fourth time to the third time is less than the ratio of the fifth time to the sixth time. The method of claim 1,
The temperature sensor measures the rate of change of temperature with respect to time,
When the rate of change is smaller than the reference rate of change, the control unit changes the first cycle to increase the second time compared to the first time. 4. The method of claim 3,
When the measured rate of change is greater than the reference rate of change, the control unit changes the first cycle to increase the first time compared to the second time. The method of claim 1,
An air flow meter for measuring the flow rate of air flowing to the heater by the fan is installed downstream of the suction port,
When the measured flow rate is less than the reference flow rate, the controller changes the first cycle of the heater to increase the first time compared to the second time. The method of claim 1,
The switch is a blower provided with a silent relay for reducing noise generated in the driving process. The method of claim 1,
The temperature sensor is a blower in contact with a region adjacent to the discharge port of the surface of the heater. The method of claim 1,
An intake air temperature sensor is installed downstream of the intake port to measure the temperature of the air introduced into the intake port,
When the temperature measured by the intake air temperature sensor is lower than the standard temperature, the controller controls the amount of power supplied to the heater to increase. 9. The method of claim 8,
When the temperature measured by the intake air temperature sensor is greater than the standard temperature, the controller controls the amount of power supplied to the heater to decrease. heating the heater by supplying power to the heater;
measuring the temperature of the heater with a temperature sensor;
If the temperature measured by the temperature sensor is equal to or greater than the set temperature, controlling the power supplied to the heater in a first cycle of cutting off the power supply to the heater for a first time and supplying power to the heater for a second time ;
measuring the temperature of the heater with the temperature sensor within the first period; and
If the temperature of the heater measured by the temperature sensor within the first period is equal to or higher than the set temperature, the heater is cut off for a third time and power is supplied to the heater for a fourth time. Including the step of controlling the power supplied to the
The ratio of the first time to the second time is smaller than the ratio of the third time to the fourth time. 11. The method of claim 10,
measuring the temperature of the heater with the temperature sensor within the second period; and
If the temperature of the heater measured by the temperature sensor within the second period is less than or equal to the minimum temperature, the heater in a third period of supplying power to the heater for a fifth time and cutting off the power supply to the heater for a sixth time. Including the step of controlling the power supplied to the
The ratio of the fourth time to the third time is smaller than the ratio of the fifth time to the sixth time. 11. The method of claim 10,
The temperature sensor measuring the temperature change rate of the heater with respect to time; and
When the rate of change measured by the temperature sensor is less than the reference rate of change, the blower control method comprising the step of changing the first period to increase the second time compared to the first time. 13. The method of claim 12,
When the change rate measured by the temperature sensor is greater than the reference rate of change, the blower control method comprising the step of changing the first period to increase the first time compared to the second time. 11. The method of claim 10,
measuring a flow rate of air passing through the heater; and
When the measured flow rate is less than the reference flow rate, the blower control method comprising the step of changing the first period to increase the first time compared to the second time. 11. The method of claim 10,
measuring a temperature of air introduced into the heater; and
When the temperature of the air introduced into the heater is lower than the standard temperature, the blower control method comprising the step of increasing the amount of power supplied to the heater. 16. The method of claim 15,
When the temperature of the air introduced into the heater is greater than the standard temperature, the blower control method comprising the step of reducing the amount of power supplied to the heater.

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