JPH10246541A - Anti-frosting device of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent for a long time a frosting from being produced in a heat exchanger in the case that the heat exchanger is used as an evaporator. SOLUTION: This device is comprised of a heat exchanger 1, a blower 2, a refrigerant temperature sensor 3 for use in sensing a refrigerant temperature, a plurality of angle variable air direction setting plates 4a to 4c along a flow of air at the upstream side of the heat exchanger 1, motors 5a to 5c for air direction setting plates for driving the air direction setting plate 4a to 4c, and a control section 6 for comparing a refrigerant evaporating temperature value detected by the refrigerant temperature sensor 3 with a predetermined set value, judging it and outputting a control signal to a motor 5 for an air direction setting plate. Then, the air direction setting plates 4a to 4c are operated to cause air passing through an entire surface of the heat exchanger 1 to be fed to a certain part of the heat exchanger, an air speed of the air passing through the heat exchanger is increased, a heat exchanging efficiency at air side is decreased and a rate of reduction of the refrigerant temperature is made low, resulting in that a growth of frosting at the device can be inhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frost prevention device for an air conditioner.

[0002]

2. Description of the Related Art A general air conditioner capable of cooling and heating is shown in FIG.
As shown in FIG. 3, a compressor 101 for compressing and discharging a refrigerant
An oil return device 102 for returning the oil discharged together with the refrigerant to the compressor 101; a four-way valve 103 for switching the flow of the refrigerant during the cooling / heating operation; and an outdoor heat exchanger 10
4, an indoor heat exchanger 105, a pressure reducing mechanism 106 for reducing the pressure of the high-pressure gas refrigerant, an outdoor heat exchanger refrigerant temperature sensor 107 for measuring the refrigerant temperature, and an indoor heat exchanger refrigerant temperature sensor 108. Configuration. In the cooling operation, the high-temperature and high-pressure refrigerant from the compressor 101 passes through the oil return device 102 and the four-way valve 103, and is condensed by exchanging heat with the outdoor heat exchanger 104 (condenser). After that, the pressure is reduced by the pressure reducing mechanism 106, evaporated by the indoor heat exchanger 105 (evaporator), and the low-temperature and low-pressure refrigerant returns to the compressor 101. In the heating operation, the compressor 101
High-temperature and high-pressure refrigerant from the tank passes through the oil return device 102 and the four-way valve 103, and enters the indoor heat exchanger 105 (condenser).
Is condensed by heat exchange in Then, the pressure reducing mechanism 10
6, the refrigerant is evaporated in the outdoor heat exchanger 104 (evaporator) and the low-temperature and low-pressure refrigerant returns to the compressor 101 to function as an air conditioner capable of cooling and heating. However, if the heating operation is continued for a long time when the outside air temperature is low, frost adheres to the surface of the outdoor heat exchanger 104, and the heating capacity is significantly reduced. Therefore, a defrosting operation is required to remove the frost. . Therefore, the outdoor heat exchanger refrigerant temperature sensor 1
07, the refrigerant temperature of the outdoor heat exchanger 104, which is measured and falls below the set temperature K1, when the four-way valve 10
By performing the defrosting operation by switching the path 3, the high-temperature and high-pressure refrigerant flows through the outdoor heat exchanger 104, and the frost that has reached the outdoor heat exchanger 104 is melted, and the refrigerant temperature of the outdoor heat exchanger 104 is reduced. Is higher than the set temperature K2, the four-way valve 103
Is switched again to return to the original heating operation. Therefore,
Particularly, when the outside air temperature is low, the operation is frequently switched to the defrosting operation during the heating operation, so that there is a problem that a stable heating capacity cannot be provided. However, it is set temperature K1 <set temperature K2.

In recent years, a typical conventional frost prevention device for an air conditioner for solving such a problem has been disclosed in Japanese Utility Model Laid-Open Publication No.
-104910. FIG. 24 shows a frost prevention device for this air conditioner.

[0004] As shown in FIG.
9, a suction grill 110, a blower 111, a plurality of wind direction guide plates 113 having a plurality of radii of curvature in the horizontal direction with respect to the wind direction of the wind flowing through the heat exchanger 112 between the blower 111 and the heat exchanger 112. The wind coming out of the blower 111
4 is connected to the wind direction guide plate 113.
And concave portions having substantially the same curvature.

In the above configuration, when the heat exchanger 112 is used as an evaporator, the wind sucked from the suction grill 110 portion is supplied to the wind direction guide plate 113 having a plurality of curvature radii parallel to the heat exchanger 112. , This wind direction inner plate 113
Since the wind uniformly guides the surface of the heat exchanger 112 by the guidance of the wind direction guide wall 115 having substantially the same curvature as the above, it is possible to prevent early frost formation on the heat exchanger 112.

[0006]

In such a conventional frost prevention device for an air conditioner, when the heat exchanger 112 is used as an evaporator during a heating operation, the surface is uniformly blown by wind, so The temperature distribution of the exchanger 112 is made uniform and frost formation at an early stage can be prevented, but frost formation on the heat exchanger 112 cannot be prevented for a long time.

[0007] Further, there is a problem that the heating capacity is significantly reduced due to frost formation, and it is required to prevent the heating capacity from decreasing.

An object of the present invention is to solve the above-mentioned problems and to prevent frost formation on the heat exchanger when the heat exchanger is used as an evaporator for a long time, and to prevent a decrease in heating capacity due to frost formation. And

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, an apparatus for preventing frost formation of an air conditioner according to the present invention has a heat exchanger, a blower, a refrigerant temperature sensor for measuring refrigerant temperature, and a heat exchanger. A plurality of wind direction setting plates that can change the angle along the flow of wind on the windward side, a motor for the wind direction setting plate that drives the wind direction setting plate, and a predetermined evaporation temperature value of the refrigerant detected by the refrigerant temperature sensor. And a control unit for comparing and judging the set value and outputting a control signal to the motor for the wind direction setting plate.

According to the present invention, the control signal output from the control unit when the heat exchanger is used as an evaporator is
By operating the wind direction setting plate, the wind passing through the entire surface of the heat exchanger is guided to a certain heat exchanger, and the wind speed of the wind passing through the heat exchanger increases to increase the airflow. Side heat exchange efficiency is reduced. Therefore, as the evaporating capacity of the heat exchanger decreases, the cycle balance collapses and the condensing capacity also decreases, moving to a cycle with a lower output than before.
An frost prevention device for an air conditioner that can inhibit the growth of frost by reducing the rate of decrease in the refrigerant temperature for stabilization is obtained.

The second means is a heat exchanger, a blower, a refrigerant temperature sensor for measuring a refrigerant temperature, and a blower which is present in an air passage and moves in the longitudinal direction of the heat exchanger to partially cut off the air flow. An air path changing plate for changing the air path, an air path changing plate motor for driving the air path changing plate, a bypass air path that opens and closes with the movement of the air path changing plate, and a refrigerant detected by the refrigerant temperature sensor. A control unit is provided for comparing and judging an evaporating temperature value with a predetermined set value and outputting a control signal to the air path changing plate motor.

According to the present invention, when the heat exchanger is used as an evaporator, the airflow path changing plate is moved by a control signal output from the control unit, so that the airflow changing plate passes through the entire surface of the heat exchanger. By guiding a part of the wind that had flowed to the bypass air path, the air flow passing through the heat exchanger decreased, the heat exchange as an evaporator decreased, and the cycle balance collapsed as the evaporating capacity declined The defrosting prevention device of the air conditioner, which can inhibit the growth of frost by slowing down the rate of decrease in the refrigerant temperature in order to move and stabilize to the cycle with lower power than before as the condensation capacity also decreases, can get.

The third means includes a heat exchanger, a blower, a refrigerant temperature sensor for measuring the temperature of the refrigerant, and a plurality of wind direction setting plates on the windward side of the heat exchanger, the wind direction setting plates being capable of changing the angle along the flow of wind. A wind direction setting plate motor for driving the wind direction setting plate, a wind direction changing plate that is present in the air path and moves in the longitudinal direction of the heat exchanger to partially cut off the air flow and change the air path, A wind path changing plate motor for driving the air path changing plate, a bypass air path that opens and closes in accordance with the movement of the air path changing plate, and a predetermined set value and an evaporation temperature value of the refrigerant detected by the refrigerant temperature sensor. A control unit for comparing and judging and outputting a control signal to the motor for the wind direction setting plate and the motor for the air flow path changing plate is provided.

According to the present invention, when the heat exchanger is used as an evaporator, the wind path changing plate and the wind direction setting plate are linked by a control signal output from the control section,
Most of the wind that had passed through the entire surface of the heat exchanger before was led to the bypass airway, and other winds could be led to some of the heat exchanger parts, so that the amount of heat exchange in the heat exchanger As the evaporating capacity decreases, the cycle balance collapses and the condensing capacity decreases, and the rate of decrease in the refrigerant evaporation temperature slows down because the cycle moves and stabilizes to a lower output cycle. A frost prevention device for an air conditioner that can inhibit the formation of frost on the air conditioner portion can be obtained.

The fourth means comprises a heat exchanger, a blower, a refrigerant temperature sensor for measuring the temperature of the refrigerant, and a plurality of wind direction setting plates on the windward side of the heat exchanger which can change the angle along the flow of wind. A wind direction setting plate motor for driving the wind direction setting plate, a plurality of temperature sensors between the heat exchanger and the blower on each leeward side of the wind direction setting plate, and a refrigerant evaporation temperature value detected by the refrigerant temperature sensor. It is provided with a control unit for comparing with a predetermined set value, making a judgment based on the detected value of the temperature sensor, and outputting a control signal to the motor for the wind direction setting plate.

According to the present invention, when the heat exchanger is used as an evaporator, the wind direction setting plate is operated in conjunction with the wind direction setting plate so as to guide the wind to a portion where the temperature is highest among the detection values of the temperature sensor. By guiding the wind to a certain leeward side of the heat exchanger 1 in a proper order, the rate of decrease in the evaporation temperature of the refrigerant becomes slow, and the frost prevention device of the air conditioner that can inhibit the growth of frost is provided. can get.

The fifth means comprises a plurality of the wind direction setting plates of the fourth means which can change the angle.

According to the present invention, when the heat exchanger is used as an evaporator, the temperature detection values of the temperature sensors are compared to specify the MAX point in each stage, and the MA value is determined.
By moving the wind direction setting plates in conjunction with each other to guide the wind to the X point, the wind is guided to some leeward side with the heat exchanger in the optimal order, and the rate of decrease in the evaporation temperature of the refrigerant is reduced. An frost prevention device for an air conditioner that can inhibit the formation of frost is obtained.

The sixth means is a heat exchanger, a blower, a refrigerant temperature sensor for measuring the temperature of the refrigerant, an air path cutoff screen on the windward side of the heat exchanger, and a rail for moving the air path cutoff screen. A driving device for an air passage blocking screen for driving the same, and comparing and judging an evaporation temperature value of the refrigerant detected by the refrigerant temperature sensor with a predetermined set value, and transmitting a control signal to the driving device for the air passage blocking screen. It has a control unit for outputting to the device.

According to the present invention, when the heat exchanger is used as an evaporator, the wind path shut-off screen is moved to guide the wind to a part of the heat exchanger, thereby reducing the evaporation temperature of the refrigerant. A frost prevention device for an air conditioner, which can reduce the ratio and inhibit the growth of frost, can be obtained.

A seventh means is provided with a plurality of the air passage blocking screens of the sixth means.

According to the present invention, when the heat exchanger is used as an evaporator, the air passage blocking screen is moved to guide the wind to a part of the heat exchanger, thereby reducing the decrease in the refrigerant evaporation temperature. A frost prevention device for an air conditioner, which can reduce the ratio and inhibit the growth of frost, can be obtained.

The eighth means is provided with an air path blocking screen which can be folded and stored in a folded shape instead of the air path blocking screen of the sixth and seventh means.

According to the present invention, when the heat exchanger is used as an evaporator, the air passage blocking screen is moved to guide the wind to a part of the heat exchanger, thereby reducing the decrease in the refrigerant evaporation temperature. A frost prevention device for an air conditioner, which can reduce the ratio and inhibit the growth of frost, can be obtained.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a heat exchanger, a blower, a refrigerant temperature sensor for measuring a refrigerant temperature, and a plurality of wind direction setting plates on the windward side of the heat exchanger which can change the angle along the flow of wind. Comparing and judging an evaporating temperature value of the refrigerant detected by the refrigerant temperature sensor with a predetermined setting value, and outputting a control signal to the motor for the air direction setting plate. With a control unit that performs
When the heat exchanger is used as an evaporator, by operating the wind direction setting plate by a control signal output from the control unit,
By guiding the wind passing through the entire surface of the heat exchanger to a part of the heat exchanger, the wind speed of the wind passing through the heat exchanger increases and the heat exchange efficiency on the air side decreases. Therefore, as the evaporating capacity of the heat exchanger decreases, the cycle balance collapses and the condensing capacity also decreases, and the rate of refrigerant temperature decrease slows down to move and stabilize the cycle to a lower output cycle than before. It has the effect of inhibiting the formation of frost.

A heat exchanger, an air blower, a refrigerant temperature sensor for measuring the temperature of the refrigerant, and an air passage existing in the air passage and moving in the longitudinal direction of the heat exchanger to partially cut off the air flow and change the air passage. A change plate, an air passage change plate motor that drives the air passage change plate, a bypass air passage that opens and closes with the movement of the air passage change plate, and a vaporization temperature value of the refrigerant detected by the refrigerant temperature sensor. It is provided with a control unit for comparing and judging a set value and outputting a control signal to the motor for the air path changing plate, and by moving the air path changing plate when the heat exchanger is used as an evaporator. By guiding a portion of the wind that has passed through the entire surface of the heat exchanger to the bypass air passage, the amount of air passing through the heat exchanger decreases, and the amount of heat exchange as an evaporator decreases. Therefore, as the evaporation capacity of the heat exchanger is reduced, the cycle balance is lost and the condensation capacity is also reduced. It has the effect of inhibiting the growth of frost.

[0027]

【Example】

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 1, the heat exchanger 1 exchanges heat of air taken into the air conditioner, and discharges the air by a blower 2. A refrigerant temperature sensor 3 for measuring a refrigerant temperature of the heat exchanger 1, a plurality of wind direction setting plates 4a, 4b, 4c on the windward side of the heat exchanger 1 which can change the angle along a flow of wind, and the wind direction setting Plates 4a, 4b, 4c
Are provided with wind direction setting plate motors 5a, 5b and 5c for driving the motors. Further, a judgment is made by comparing the evaporation temperature value of the refrigerant detected by the refrigerant temperature sensor 3 with a predetermined set value, and a control signal is transmitted so as to operate the wind direction setting plates 4a, 4b, 4c in conjunction with each other. Setting plate motors 5a, 5
A control unit 6 for outputting the signals to b and 5c is provided.

FIG. 2 shows the operation pattern of the wind direction setting plates 4a, 4b, 4c. The pattern A guides the wind only to the leeward portion of the wind direction setting plate 4a, and the wind is directed only to the leeward portion of the wind direction setting plate 4b. There are a B pattern, a C pattern for guiding the wind only to the leeward portion of the wind direction setting plate 4c, and a D pattern (initial state) for uniformly distributing the wind over the entire surface of the heat exchanger 1.

The operation of the above configuration will be described with reference to FIG. When the heat exchanger 1 is used as an evaporator, frost forms on the surface of the heat exchanger 1, and when it begins to grow, the refrigerant evaporation temperature of the heat exchanger 1 decreases. When the detected refrigerant evaporation temperature value is set temperature K1> refrigerant evaporation temperature value> set temperature K2 and wind direction setting plates 4a, 4a,
When b and 4c are in the initial state (D pattern in FIG. 2), the control signal output from the control unit 6 causes the wind direction setting plate 4
By operating the a, 4b, and 4c in the pattern A of FIG. 2, the wind that has been passing through the entire surface of the heat exchanger 1 is guided to the heat exchanger portion on the leeward side of the wind direction setting plate 4a. The wind speed of the wind passing through the heat exchanger increases, and the heat exchange efficiency on the air side decreases. Accordingly, as the evaporating capacity of the heat exchanger 1 decreases, the cycle balance collapses, and the condensing capacity also decreases. In order to move and stabilize the cycle to a lower output cycle than before, the formation of frost formation on the heat exchanger part is increased. Can be inhibited. When the elapsed time in that state exceeds the set time T1, the control signal output from the control unit 6 causes the wind direction setting plate 4
By changing the patterns a, 4b, and 4c from the pattern A in FIG. 2 to the pattern B, the wind that has been guided to the heat exchanger portion on the leeward side of the wind direction setting plate 4a until then is exchanged on the leeward side of the wind direction setting plate 4b. Can be led to the container part. Thereafter, the wind direction setting plates 4a, 4a whose angles can be changed by a control signal from the control unit 6
By operating b and 4c in conjunction, it is possible to guide the wind to a certain part of the heat exchanger 1 in order, and to inhibit the formation of frost on the remaining heat exchanger part.

FIG. 4 is a flowchart showing a control method used by the control unit 6 according to the present invention. First, when the operation switch of the air conditioner is turned on, from the start which is the seventh step, in the eighth step, the wind direction setting plates 4a, 4a
An operation command for the D pattern, which is the initial state of b and 4c, is output to the wind direction setting plate motors 5a, 5b and 5c. In the ninth step, the process proceeds to the detection of the evaporation temperature of the refrigerant obtained by the refrigerant temperature sensor 3. In the tenth step, the evaporation temperature of the refrigerant is compared with the set temperature K1, and when the evaporation temperature of the refrigerant is lower than the set temperature K1, Proceeding to the twelfth step, the process returns to the tenth step if the evaporation temperature of the refrigerant is higher than the set temperature K1. In the eleventh step, the evaporating temperature of the refrigerant is compared with the set temperature K2. If the evaporating temperature of the refrigerant is higher than the set temperature K2, the process proceeds to the twelfth step. If the evaporating temperature of the refrigerant is lower than the set temperature K2, the fifteenth step is performed. Proceeding to a step, a four-way valve de-ice operation command is output. First
In the two steps, it is determined whether or not a wind direction setting plate operation command other than the command to the D pattern in the initial state has been issued. If the command has been issued, the process proceeds to the thirteenth step.
If no command has been issued, proceed to the 16th step,
An operation command for changing the wind direction setting plate to the A pattern is output. In the thirteenth step, the elapsed time from when the wind direction setting plate pattern change command is issued is compared with the set time T1, and if the elapsed time is longer than the set time T1, the process proceeds to the fourteenth step, where the wind direction setting plate 4a, 4b, 4c are changed to the B pattern if the current pattern is the A pattern, to the C pattern if the B pattern, or to the A pattern if the C pattern, and to the wind direction setting plate motors 5a, 5b,
5c. If the elapsed time is shorter than the set time T1, the process returns to the ninth step. When the operation switch is turned off, END is set in the seventeenth step. However, the set temperature K1> the set temperature K2.

In the embodiment, an operation command for changing the wind direction setting plate to the A pattern is output in the sixteenth step. However, instead of changing the wind direction setting plate to the A pattern, a B pattern or a C pattern is output. May be changed so that no difference is produced in the operation and effect.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIGS.

As shown in FIG. 5, the heat exchanger 1 exchanges heat of air taken into the air conditioner, and discharges the air by a blower 2. A refrigerant temperature sensor 3 for measuring the refrigerant temperature of the heat exchanger 1, and an air path changing plate 18a which is present in the air path and moves in the longitudinal direction of the heat exchanger 1 to partially cut off the air supply and change the air path. , 18b and the wind path changing plate 18
a, 18b for driving the air path changing plate
9b, and bypass air paths 20a, 20b that open and close as the air path change plates 18a, 18b move.

Further, a judgment is made by comparing the evaporating temperature value of the refrigerant detected by the refrigerant temperature sensor 3 with a predetermined set value, and a control signal is issued so that the air path change plates 18a and 18b are operated in conjunction with each other. Motor 19a, 19 for wind path change plate
b is provided with a control unit 21 for outputting the result to the control unit b.

The operation of the above configuration will be described with reference to FIG. When the heat exchanger 1 is used as an evaporator, frost forms on the surface of the heat exchanger 1, and when it begins to grow, the refrigerant evaporation temperature of the heat exchanger 1 decreases. If the detected refrigerant evaporation temperature value is set temperature K1> refrigerant evaporation temperature value> set temperature K2 and air path change plates 18a, 1
8b has not yet moved, the motor 19a for the airway changing plate moves to move the airway changing plate 18a by the control signal output from the control unit 21, and the airway changing plate 18
is moved toward the center of the heat exchanger 1, a part of the wind that has been passing through the entire surface of the heat exchanger 1 is guided to the bypass air passage 20 a, so that the air volume passing through the heat exchanger portion As the heat exchange capacity of the evaporator decreases, the cycle balance collapses as the evaporating capacity decreases, and the condensing capacity also decreases. Partial frost growth can be inhibited.

If the elapsed time in that state exceeds the set time T2, the control unit 21 outputs a control signal to move the air flow path changing plate 18a to its original position, thereby closing the bypass air flow path 20a and simultaneously turning off the air flow path. Change plate 18b to heat exchanger 1
, The bypass air path 20b is opened, and the wind that has been guided to the bypass air path 20a can be guided to the bypass air path 20b. Thereafter, by using the bypass air passage 20a and the bypass air passage 20b alternately, the amount of heat exchange in the heat exchanger 1 is reduced, and the rate of decrease in the evaporation temperature of the refrigerant becomes slower. The formation of frost can be inhibited.

FIG. 7 is a flowchart showing a control method used by the control unit 21 according to the present invention. First, when the operation switch of the air conditioner is turned on, the process proceeds from the start, which is the seventh step, to the detection of the evaporation temperature of the refrigerant obtained by the refrigerant temperature sensor 3 in the ninth step, and the evaporation temperature of the refrigerant in the tenth step. The set temperature K1 is compared. If the evaporating temperature of the refrigerant is lower than the set temperature K1, the process proceeds to an eleventh step. If the evaporating temperature of the refrigerant is higher than the set temperature K1, the process returns to the ninth step. In the eleventh step, the evaporating temperature of the refrigerant is compared with the set temperature K2. If the evaporating temperature of the refrigerant is higher than the set temperature K2, the process proceeds to the 22nd step. Proceed to step 15 to output a four-way valve de-ice operation command. In a twenty-second step, it is determined whether or not a wind path change plate movement command has been issued.
Proceed to step 3 and if no command has been issued
Proceeding to a step, a command to move the air path changing plate 18a is output to the air path changing plate motor 6a. In the 23rd step, the elapsed time from when the wind path changing plate movement command is issued is compared with the set time T2, and if the elapsed time is longer than the set time T2, the process proceeds to the 24th step to change the moving wind path. A command to move the plate to the original position and a command to move the non-moved air path changing plate toward the center of the heat exchanger 1 are output to the air path changing plate motors 19a and 19b. If the elapsed time is shorter than the set time T2, the process returns to the ninth step. When the operation switch is turned off, END is set in the seventeenth step. However, set temperature K1> set temperature K
2.

In the embodiment, the air path changing plate 18a is moved in the 24th step.
The air path changing plate 18b may be moved instead of a, so that there is no difference in the operation and effect.

(Embodiment 3) Next, Embodiment 3 of the present invention will be described with reference to FIGS.

As shown in FIG. 8, the heat exchanger 1 is for exchanging heat of the air sucked into the air conditioner, and the air is discharged by the blower 2. A refrigerant temperature sensor 3 for measuring the refrigerant temperature of the heat exchanger 1, and a plurality of wind direction setting plates 4a, 4a on the windward side of the heat exchanger 1 which can change the angle along the flow of wind.
b, 4c, wind direction setting plate motors 5a, 5b, 5c for driving the wind direction setting plates 4a, 4b, 4c, and partially moving by moving in the longitudinal direction of the heat exchanger 1 in the air path. Airway change plates 18a, 18b that cut off the airflow and change the airway
Motors 19a and 19b for driving the air flow path change plates 18a and 18b;
8b, bypass air paths 20a and 20b that open and close with the movement of 8b
It has. Further, the judgment is made by comparing the evaporating temperature value of the refrigerant detected by the refrigerant temperature sensor 3 with a predetermined set value, and the wind path changing plates 18a, 18b and the wind direction setting plates 4a, 4b, 4c are linked. There is provided a control unit 26 that outputs control signals to the air path changing plate motors 19a and 19b and the wind direction setting plate motors 5a, 5b and 5c to operate.

The operation of the above configuration will be described with reference to FIG. When the heat exchanger 1 is used as an evaporator, frost forms on the surface of the heat exchanger 1, and when it starts to grow, the evaporation temperature of the refrigerant in the heat exchanger decreases. The detected refrigerant evaporation temperature detection value is equal to the set temperature K1>
Refrigerant evaporation temperature detection value> Set temperature K2 and wind direction setting plate 4
a, 4b, and 4c are in the initial state (D pattern in FIG. 2) and when the air path change plates 18a and 18b have not yet moved, the air path change plate 18 is controlled by a control signal output from the control unit 26.
In order to move b, the air path changing plate motor 19b moves, moving the air path changing plate 18b toward the center of the heat exchanger 1 and operating the wind direction setting plates 4a, 4b, 4c in the pattern A in FIG. By doing so, most of the wind that had passed through the entire surface of the heat exchanger 1 was guided to the bypass air passage 20b,
Since other winds can be guided to the heat exchanger portion on the leeward side of the wind direction setting plate 4a, the amount of heat exchange in the heat exchanger 1 decreases, and the cycle balance collapses as the evaporation capacity decreases, and condensing occurs. As the capacity decreases and moves to a cycle with a lower output than before, the rate of decrease in the evaporation temperature of the refrigerant becomes slower, and the growth of frost formation on the heat exchanger can be inhibited.

If the elapsed time in that state exceeds the set time T3, the control unit 26 outputs a control signal to move the air flow path changing plate 18b to its original position, thereby closing the bypass air flow path 20b and simultaneously turning off the air flow path. Change plate 18a to heat exchanger 1
By opening the bypass air passage 20a by moving it in the center direction, and changing the wind direction setting plates 4a, 4b, and 4c from the pattern A in FIG. 2 to the pattern C, the bypass air passage 20b and the wind direction setting plate 4a The wind guided to the leeward heat exchanger can be guided to the leeward heat exchanger of the bypass air passage 20a and the wind direction setting plate 4c. Thereafter, the heat exchanger 1 by using the bypass wind path 20a and the leeward heat exchanger part of the wind direction setting plate 4c and the bypass air path 20b and the leeward heat exchanger part of the wind direction setting plate 4a alternately. Therefore, the rate of decrease in the evaporating temperature of the refrigerant becomes slower and the growth of frost can be inhibited.

FIG. 10 is a flowchart showing a control method used by the control unit 26 according to the present invention. First, when the operation switch of the air conditioner is turned on, from the start which is the seventh step, the wind direction setting plate 4a which is the eighth step,
An operation command for the D pattern, which is the initial state of 4b and 4c, is output to the wind direction setting plate motors 5a, 5b and 5c. Ninth
Proceeding to the detection of the evaporation temperature of the refrigerant obtained by the refrigerant temperature sensor 3 as a step, the evaporation temperature of the refrigerant is compared with the set temperature K1 in a tenth step, and if the evaporation temperature of the refrigerant is lower than the set temperature K1, the eleventh step When the evaporating temperature of the refrigerant is higher than the set temperature K1, the process returns to the ninth step. In the eleventh step, the evaporating temperature of the refrigerant is compared with the set temperature K2, and the evaporating temperature of the refrigerant is set at the set temperature K2.
If it is higher than 2, the process proceeds to step 22; if the evaporation temperature of the refrigerant is lower than the set temperature K2, the process proceeds to step 15 to output a four-way valve de-ice operation command. In the 22nd step, it is determined whether or not a wind path change plate movement command has been issued, and if the command has been issued, the process proceeds to the 27th step,
If no command has been issued, proceed to step 29,
A command to move the air path changing plate 18b is output to the air path changing plate motor 19b, and an operation command to change the air direction setting plate to the pattern A in FIG. In the twenty-seventh step, the elapsed time from when the wind path change plate movement command is issued is compared with the set time T3. If the elapsed time is longer than the set time T3, the process proceeds to the twenty-fourth step,
A command to move the moving air path changing plate to the original position and a command to move the non-moving air path changing plate toward the center of the heat exchanger 1 are output to the air path changing plate motors 19a and 19b. In the 28th step, wind direction setting plates 4a, 4b,
If the current pattern is the pattern A, the operation command for changing the pattern 4c to the pattern C or to the pattern A if the pattern is the pattern C is output to the wind direction setting plate motors 5a, 5b, 5c. If the elapsed time is shorter than the set time T3, the ninth
Returned to step. When the operation switch is turned off, END is set in the seventeenth step. However, the set temperature K1> the set temperature K2.

In the embodiment, the air path changing plate 18b is moved in the 29th step.
The air path changing plate 18a may be moved instead of 8b, and the sixteenth step is replaced with the wind direction setting plate operation command to the C pattern, but there is no difference in the operation effect.

(Embodiment 4) Next, Embodiment 4 of the present invention will be described with reference to FIG. 2 and FIGS.

As shown in FIG. 11, a heat exchanger 1 is for exchanging heat between air sucked into an air conditioner,
To discharge the air. A refrigerant temperature sensor 3 for measuring the refrigerant temperature of the heat exchanger 1, and a plurality of wind direction setting plates 4 a on the windward side of the heat exchanger 1 which can change the angle along the flow of wind.
4b, 4c, motors 5a, 5b, 5c for the wind direction setting plates for driving the wind direction setting plates 4a, 4b, 4c, and the heat exchanger 1 on the downwind side of each of the wind direction setting plates 4a, 4b, 4c.
And a plurality of temperature sensors 30a, 30b, 3
0c. Further, a comparison is made between a refrigerant evaporation temperature value detected by the refrigerant temperature sensor 3 and a predetermined set value,
At the same time, judgment is made based on the magnitudes of the detection values of the temperature sensors 30a, 30b, 30c, and a control signal is sent to the wind direction setting plate motor 5 so that the wind direction setting plates 4a, 4b, 4c operate in conjunction with each other.
A control unit 31 for outputting the signals to a, 5b, and 5c is provided.

The operation of the above configuration will be described with reference to FIG. The detection values of the temperature sensors 30a, 30b, and 30c are denoted by Ka, Kb, and Kc, respectively. When the heat exchanger 1 is used as an evaporator, frost forms on the surface of the heat exchanger 1, and when it begins to grow, the refrigerant evaporation temperature of the heat exchanger 1 decreases, and the refrigerant temperature sensor 3 Is the set temperature K1> the detected value of the evaporation temperature of the refrigerant>
When the set temperature K2 and the detection values of the temperature sensors 30a, 30b, 30c are Ka>Kb> Kc, and the wind direction setting plates 4a, 4b,
When 4c is in the initial state (D pattern of the operation pattern in FIG. 2), the wind direction setting plates 4a, 4b, and 4c are controlled by the control signals output from the control unit 31 to the temperature sensors 30a, 30b,
The wind direction setting plate 4 is set to Ka having the highest temperature among the detected values of 30c.
wind direction setting plates 4a, 4b, 4 so as to guide the wind to the leeward part of a
By operating c in the pattern A of FIG. 2, the wind that has been passing through the entire surface of the heat exchanger 1 is led to the heat exchanger portion on the leeward side of a certain wind direction setting plate, so that the heat exchange is performed. The wind speed of the wind passing through the vessel increases, and the heat exchange efficiency on the air side decreases. Accordingly, as the evaporating capacity of the heat exchanger 1 decreases, the cycle balance collapses, and the condensing capacity also decreases. In order to move and stabilize the cycle to a lower output cycle than before, the formation of frost formation on the heat exchanger part is increased. Can be inhibited.

If the elapsed time in that state exceeds the set time T4, the temperature sensor 3
The wind direction setting plates 4a, 4b, 4c are set to A to A in FIG. 2 so as to guide the wind to the portion having the highest temperature among the detected values of 0a, 30b, 30c.
By moving in conjunction with one of the C patterns, the wind can be guided to a certain leeward side of the heat exchanger 1 in an optimal order. Thereafter, according to the control signal from the control unit 31, the wind direction setting plates 4a, 4b, and 4b guide the wind to the portion having the highest temperature among the detection values of the temperature sensors 30a, 30b, and 30c.
By moving 4c in conjunction with each other, the wind is guided to a certain leeward side of the heat exchanger 1 in an optimal order, the rate of decrease in the evaporation temperature of the refrigerant becomes slow, and the growth of frost formation can be inhibited.

FIG. 13 is a flowchart showing a control method used by the control unit 31 according to the present invention. First, when the operation switch of the air conditioner is turned on, from the start which is the seventh step, the wind direction setting plate 4a which is the eighth step,
An operation command for the D pattern, which is the initial state of 4b and 4c, is output to the wind direction setting plate motors 5a, 5b and 5c. Ninth
Proceeding to the detection of the evaporation temperature of the refrigerant obtained by the refrigerant temperature sensor 3 as a step, the evaporation temperature of the refrigerant is compared with the set temperature K1 in a tenth step, and if the evaporation temperature of the refrigerant is lower than the set temperature K1, the eleventh step When the evaporating temperature of the refrigerant is higher than the set temperature K1, the process returns to the ninth step. In the eleventh step, the evaporating temperature of the refrigerant is compared with the set temperature K2, and the evaporating temperature of the refrigerant is set at the set temperature K2.
If it is higher than 2, the process proceeds to a twelfth step. If the evaporation temperature of the refrigerant is lower than the set temperature K2, the process proceeds to a 15th step to output a four-way valve de-ice operation command. In the twelfth step, it is determined whether or not a wind direction setting plate operation command other than the command to the D pattern in the initial state has been issued. If the command has been issued, the process proceeds to the thirteenth step, and no command has been issued. In this case, the process proceeds to the 33rd step. In the thirteenth step, the elapsed time from when the wind direction setting plate pattern change command is issued is compared with the set time T4. If the elapsed time is longer than the set time T4, the process proceeds to the thirty-third step, where the temperature sensors 30a, 30b , 30c to determine the point of MAX. In the 34th step, a wind direction setting plate 4 is provided to guide the wind to the MAX point.
a, 4b and 4c are changed to any of the patterns A to C in FIG.
Output to If the elapsed time is shorter than the set time T4, the process returns to the ninth step. Operation switch is O
When the FF is performed, END is set in the 17th step. However,
Set temperature K1> set temperature K2.

Fifth Embodiment Next, a fifth embodiment of the present invention will be described with reference to FIG. 2 and FIGS.

As shown in FIG. 14, the heat exchanger 1 is for exchanging heat with the air sucked into the air conditioner.
To discharge the air. A refrigerant temperature sensor 3 for measuring the refrigerant temperature of the heat exchanger 1; and a plurality of wind direction setting plates 35 on the windward side of the heat exchanger 1 which can change the angle along the flow of wind.
a, 35b, 35c, 35d, 35e, 35f, and a plurality of stages, and the wind direction setting plates 35a, 35b, 35c, 35d,
Wind direction setting plate motor 36 for driving 35e, 35f
a, 36b, 36c, 36d, 36e, 36f and wind direction setting plates 35a, 35b, 35c, 35d, 35e, 35
A plurality of temperature sensors 37a, 37b, 37c, 37d, 37 between the heat exchanger 1 and the blower 2 on each lee side of f.
e, 37f. In addition, the refrigerant temperature sensor 3 compares the evaporation temperature value of the refrigerant detected with the refrigerant temperature sensor 3 with a predetermined set value, and at the same time, the temperature sensors 37a, 37b, 37c, 37
Judgment is made based on the magnitudes of the detected values of d, 37e, and 37f, and the wind direction setting plates 35a, 35b, 35c, 35d, 35e, 35
The control signals are transmitted to the wind direction setting plate motors 36a, 36b, 36c, 36d, 36e, 36 so that the motors f operate in conjunction with each other.
A control unit 38 for outputting to f is provided.

The operation of the above configuration will be described with reference to FIG. Temperature sensors 37a, 37b, 37c, 37d, 3
The detected values of 7e and 37f are calculated as Ka, Kb, Kc and K, respectively.
d, Ke, and Kf. When the heat exchanger 1 is used as an evaporator, frost forms on the surface of the heat exchanger 1, and when it begins to grow, the evaporation temperature of the refrigerant in the heat exchanger decreases,
The detected value of the evaporation temperature of the refrigerant detected by the refrigerant temperature sensor 3 is set temperature K1> the detected value of the evaporation temperature of the refrigerant> the set temperature K
2 and temperature sensors 37a, 37b, 37c, 37d, 3
The detection values of 7e and 37f are Ka>Kb> Kc in the upper stage, Kd <Ke <Kf in the lower stage, and the wind direction setting plates 35a and 35 in the upper stage.
b, 35c and lower wind direction setting plates 35d, 35e, 35f
In both cases, in the initial state (pattern position D of the operation pattern in FIG. 2), the upper wind direction setting plates 35a, 35b, and 35c are moved to the position A pattern of the operation pattern in FIG. By moving the lower wind direction setting plates 35d, 35e, and 35f in conjunction with the arrangement position C pattern of the operation pattern in FIG. 2, the wind that has passed through the entire surface of the heat exchanger 1 until then is changed. 35
By guiding to the heat exchanger portion on the leeward side of f, the wind speed of the wind passing through the heat exchanger portion increases, and the heat exchange efficiency on the air side decreases. Therefore, as the evaporating capacity of the heat exchanger 1 decreases, the cycle balance collapses and the condensing capacity also decreases, and the frost formation of the heat exchanger part grows to move and stabilize the cycle to a lower output cycle than before. Can be inhibited. If the elapsed time in that state exceeds the set time T5, the control unit 3
8, the upper temperature sensor 3
The wind direction setting plate 35 guides the wind to a portion where the temperature is the highest in the detection values of 7a, 37b and 37c and a portion where the temperature is the highest in the detection values of the lower temperature sensors 37d, 37e and 37f.
By operating a, 35b, 35c, 35d, 35e, and 35f to any of the arrangement positions A to C of the operation pattern in FIG. 2, the wind can be guided to a part of the heat exchanger 1 in an optimal order. . Thereafter, in response to a control signal from the control unit 38, the upper temperature sensors 37a, 37b, 3
7c, and the wind direction setting plates 35a, 35b, 35 so as to guide the wind to the portion having the highest temperature among the detection values of the lower temperature sensors 37d, 37e, 37f.
By moving c, 35d, 35e, and 35f in conjunction with each other, the wind is guided to a part of the leeward side of the heat exchanger 1 in an optimal order, the rate of decrease in the evaporation temperature of the refrigerant becomes slow, and the growth of frost is reduced. Can be inhibited.

FIG. 16 is a flowchart showing a control method used by the control unit 38 according to the present invention. First, when the operation switch of the air conditioner is turned on, the wind direction setting plates 35a, 35b, 35c, 35d, 35e, and 35 are set in the upper and lower stages of the 39th step from the start of the seventh step.
The operation command to the arrangement position D pattern of the operation pattern of FIG. 2 which is the initial state of f is transmitted to the wind direction setting plate motors 36a and 36.
b, 36c, 36d, 36e, 36f. Ninth
Proceeding to the detection of the evaporation temperature of the refrigerant obtained by the refrigerant temperature sensor 3 as a step, the evaporation temperature of the refrigerant is compared with the set temperature K1 in a tenth step, and if the evaporation temperature of the refrigerant is lower than the set temperature K1, the eleventh step When the evaporating temperature of the refrigerant is higher than the set temperature K1, the process returns to the ninth step.

In the eleventh step, the evaporating temperature of the refrigerant is compared with the set temperature K2. If the evaporating temperature of the refrigerant is higher than the set temperature K2, the process proceeds to the twelfth step, where the evaporating temperature of the refrigerant is lower than the set temperature K2. In this case, the process proceeds to the fifteenth step to output a four-way valve de-ice operation command. In the twelfth step, it is determined whether or not a wind direction setting plate operation command other than the command to the arrangement position D pattern of the operation pattern in FIG. Proceed to step 40, and if no command has been issued, proceed to step 41. In the fortieth step, the elapsed time from when the wind direction setting plate pattern change command is issued is compared with the set time T5, and the elapsed time is compared with the set time T5.
If it is longer, the process proceeds to step 41, where the temperature sensor 3
By comparing the detected temperature values of 7a, 37b, 37c, 37d, 37e, and 37f, the MAX point in each stage is specified. In the forty-second step, the wind direction setting plates 35a, 35b, 35c, 35 are set so as to guide the wind to the MAX point.
d, 35e, and 35f are the arrangement positions A of the operation pattern in FIG.
To C patterns, the operation commands are sent to the wind direction setting plate motors 36a, 36b, 36c, 36d, 36.
e, 36f. The elapsed time is the set time T5.
If shorter, the process returns to the ninth step. When the operation switch is turned off, END is set in the seventeenth step. However, the set temperature K1> the set temperature K2.

In the above configuration, a plurality of wind direction setting plates 3
5a, 35b, 35c, 35d, 35e, 35f and temperature sensors 37a, 37b, 37c, 37d, 37e, 3
7f, the temperature sensors 37a, 37b, 37
Comparing the temperature detection values of c, 37d, 37e and 37f,
The wind direction setting plates 35a, 35b, and 35 specify the MAX point in each stage and guide the wind to the MAX point.
By moving c, 35d, 35e, and 35f in conjunction with each other, the wind is guided to a part of the leeward side of the heat exchanger 1 in the optimum order, so that the rate of decrease in the evaporation temperature of the refrigerant becomes slower, and the frost formation is reduced. Growth can be inhibited.

Sixth Embodiment Next, a sixth embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 17, a heat exchanger 1 is for exchanging heat of the air sucked into the air conditioner.
To discharge the air. A refrigerant temperature sensor 3 for measuring the refrigerant temperature of the heat exchanger 1, and an air path cutoff screen 43 provided on the windward side of the heat exchanger 1.
3, a rail 44 for assisting the movement of the air passage 3, and a drive device 45 for the air passage blocking screen for driving the air passage blocking screen 43. In addition, the controller determines the comparison by comparing the evaporating temperature value of the refrigerant detected by the refrigerant temperature sensor 3 with a predetermined set value, and sends a control signal to move the air path blocking screen 43 to the driving apparatus for the air path blocking screen. A control unit 46 for outputting the data to the control unit 45 is provided.

The operation of the above configuration will be described below. A region where the core length of the heat exchanger 1 is divided into three equal parts is a refrigerant temperature sensor 3
Area C, area B, and area A from the side.
When the heat exchanger 1 is used as an evaporator, frost forms on the surface of the heat exchanger 1, and when it begins to grow, the refrigerant evaporation temperature of the heat exchanger decreases and is detected by the refrigerant temperature sensor 3. When the set temperature K1> the evaporating temperature value of the refrigerant> the set temperature K2> and the air path cutoff screen 43 is in the initial state where the heat exchanger 1 is not shut off at all, the output is output from the control unit 46. By the control signal, the wind path cutoff screen 43 moves on the rail to a position where both the area B and the area C are cut off, so that the wind that has been passing through the entire surface of the heat exchanger 1 until then is moved to the leeward side of the area A. In this case, the wind speed of the wind passing through the heat exchanger increases, and the heat exchange efficiency on the air side decreases. Therefore, heat exchanger 1
As the evaporation capacity decreases, the cycle balance collapses and the condensation capacity also decreases, and the growth and formation of frost on the heat exchanger can be hindered in order to move and stabilize the cycle to a lower output cycle than before. .

If the elapsed time in this state exceeds the set time T6, the control signal output from the control unit 46 moves the wind path cutoff screen 43 on the rail to a position where only the area C is cut off. The wind that has been guided to the heat exchanger portion on the leeward side of the area A can be guided to the heat exchanger portion on the leeward side of the area A and the area B. Thereafter, the control unit 4
By the control signal from 6, the air path blocking screen 43
The wind is guided to a part of the heat exchanger 1 by moving on the rail to the initial state (there is no cutoff area), a position where both the area B and the area C are cut off, and a position where only the area C is cut off. And the rate of decrease becomes slow, and the growth of frost formation can be inhibited.

FIG. 18 is a flowchart showing a control method used by the control unit 46 according to the present invention. First, when the operation switch of the air conditioner is turned on, from the start, which is the seventh step, in the 47th step, a command to move the air conditioner to the initial state in which the heat exchanger 1 does not shut off the heat exchanger 1 at all in the 47th step. It outputs to the drive device 45 for a shielding screen. In the ninth step, the process proceeds to the detection of the evaporation temperature of the refrigerant obtained by the refrigerant temperature sensor 3. In the tenth step, the evaporation temperature of the refrigerant is compared with the set temperature K1, and if the evaporation temperature of the refrigerant is lower than the set temperature K1, Proceed to step 11,
If the evaporation temperature of the refrigerant is higher than the set temperature K1, the process returns to the ninth step. In the eleventh step, the evaporating temperature of the refrigerant is compared with the set temperature K2. If the evaporating temperature of the refrigerant is higher than the set temperature K2, the process proceeds to a forty-eighth step. Proceed to step 15 to output a four-way valve de-ice operation command. In a forty-eighth step, the current elapsed time of the air passage blocking screen 43 is calculated. In a forty-ninth step, the current elapsed time of the airflow shielding screen 43 is compared with the set time T6.
Proceeding to the step, if the current state is the initial state, move to the position where both the area B and the area C are cut off. If the current state is the state where both the area B and the area C are cut off, move to the position where only the area C is cut off. If only C is blocked, an operation command is output to the drive unit 45 for moving the air passage screen so as to move the air passage screen 43 to the initial state.
If the elapsed time is shorter than the set time T6, the process returns to the ninth step. When the operation switch is turned off, END is set in the seventeenth step. However, the set temperature K1
> Set temperature K2.

In the embodiment, the air passage blocking screen 4
3 is moved in the longitudinal direction with respect to the entire surface of the heat exchanger 1, but the air passage blocking screen 43 may be installed so as to move in the vertical direction with respect to the entire surface of the heat exchanger 1.
There is no difference in the effects.

Further, the entire surface of the heat exchanger 1 is divided into three equal parts to form an area A, an area B, and an area C.
Although the moving position of 3 has been determined, it goes without saying that instead of dividing the entire surface of the heat exchanger 1 into three equal parts, four or five equal parts may be used.

(Embodiment 7) Next, Embodiment 7 of the present invention will be described with reference to FIGS.

As shown in FIG. 19, the heat exchanger 1 is for exchanging heat between the air sucked into the air conditioner,
To discharge the air. A refrigerant temperature sensor 3 for measuring the refrigerant temperature of the heat exchanger 1, a plurality of air path cutoff screens 51a and 51b on the windward side of the heat exchanger 1, and a rail 52 for assisting the movement thereof; ,
Driving device 53 for an air passage blocking screen for driving 51b
a, 53b.

Further, a judgment is made by comparing the evaporating temperature value of the refrigerant detected by the refrigerant temperature sensor 3 with a predetermined set value, and a control signal is issued to move the air path cutoff screens 51a and 51b. A control unit 54 for outputting to the road-blocking screen driving devices 53a, 53b is provided.

The operation of the above configuration will be described below. A region where the core length of the heat exchanger 1 is divided into three equal parts is a refrigerant temperature sensor 3
Area C, area B, and area A from the side.
When the heat exchanger 1 is used as an evaporator, frost forms on the surface of the heat exchanger 1, and when it starts to grow, the evaporation temperature of the refrigerant in the heat exchanger decreases. When the detected refrigerant evaporation temperature value is set temperature K1> refrigerant evaporation temperature value> set temperature K2 and air path cutoff screen 51
When a and 51b are in the initial state in which the heat exchanger 1 is not shut off at all, the control signal output from the control unit 54
By moving on the rails to the position where the air path cutoff screens 51a and 51b block both the area B and the area C, the wind that has passed through the entire surface of the heat exchanger 1 until then is moved to the heat on the leeward side of the area A. By guiding the heat to the exchanger, the wind speed of the wind passing through the heat exchanger increases, and the heat exchange efficiency on the air side decreases. Accordingly, as the evaporating capacity of the heat exchanger 1 decreases, the cycle balance collapses, and the condensing capacity also decreases. In order to move and stabilize the cycle to a lower output cycle than before, the formation of frost formation on the heat exchanger part is increased. Can be inhibited. If the elapsed time in that state exceeds the set time T7, the control unit 5
According to the control signal output from 4, the air path cutoff screens 51a and 51b move on the rail to a position where both the area A and the area C are cut off, and can be guided to the heat exchanger portion of the area B. Thereafter, in response to a control signal from the control unit 54, the air path cutoff screens 51a and 51b move along the rail to a specific position in conjunction with each other to guide the wind to a part of the heat exchanger 1, and the evaporation temperature of the refrigerant. And the rate of decrease becomes slow, and the growth of frost formation can be inhibited.

FIG. 20 is a flowchart showing a control method used by the control unit 54 according to the present invention. First, when the operation switch of the air conditioner is turned on, from the start which is the seventh step, in the 47th step, a movement command to an initial state in which the air path cutoff screens 51a and 51b do not block the heat exchanger 1 at all is issued. Airway blocking screen drive 5
3a and 53b. Proceeding to the ninth step of detecting the evaporation temperature of the refrigerant obtained by the refrigerant temperature sensor 3,
In a tenth step, the evaporating temperature of the refrigerant is compared with the set temperature K1, and if the evaporating temperature of the refrigerant is lower than the set temperature K1, the first
Proceeding to one step, return to the ninth step if the evaporation temperature of the refrigerant is higher than the set temperature K1. Also, the eleventh
In the step, the evaporating temperature of the refrigerant is compared with the set temperature K2, and if the evaporating temperature of the refrigerant is higher than the set temperature K2, the fourth
Proceeding to step 8, if the evaporating temperature of the refrigerant is lower than the set temperature K2, proceeding to step 15 to output a four-way valve de-ice operation command. In a forty-eighth step, the current elapsed time of the air path cutoff screens 51a and 51b is calculated.
In the fifty-fifth step, the air path blocking screen 51
The current elapsed times a and 51b are compared with the set time T7, and if the elapsed time is longer than the set time T7, the process proceeds to a step 56. If the current status is the initial state, the process proceeds to a position where both the area B and the area C are shut off. If the current state is a state in which both the area B and the area C are blocked, the position of the area A and the area C is blocked. To the position where both are blocked, to the position where only area C is blocked if the current condition is that both area A and area B are blocked, to the position where only area A is blocked if the current condition is that only area C is blocked. If only the area A is shut off, an operation command is issued so as to move the air path blocking screens 51a and 51b to the initial state.
3b. If the elapsed time is shorter than the set time T7, the process returns to the ninth step. When the operation switch is turned off, END is set in the seventeenth step. However, the set temperature K1> the set temperature K2.

In the embodiment, the air path blocking screen 5
1a and 51b are moved in the longitudinal direction with respect to the entire surface of the heat exchanger 1. However, the air passage blocking screens 51a and 51b are moved so as to move in the vertical direction with respect to the entire surface of the heat exchanger 1.
b may be provided, and there is no difference in the operation and effect.

Further, the entire surface of the heat exchanger 1 is divided into three equal parts to form area A, area B, and area C.
Although the moving positions of 1a and 51b are determined, it goes without saying that instead of dividing the entire surface of the heat exchanger 1 into three equal parts, four or five equal parts may be used.

Embodiment 8 Next, Embodiment 8 of the present invention will be described with reference to FIGS.

As shown in FIG. 21, the heat exchanger 1 is for exchanging heat between the air sucked into the air conditioner,
To discharge the air. A refrigerant temperature sensor 3 for measuring the refrigerant temperature of the heat exchanger 1, and a plurality of air path cutoff screens 57 a and 57 b which are folded and housed on the windward side of the heat exchanger 1 to assist movement thereof. Rails 58 and drive devices 59a and 59b for the air path blocking screen that drive the air path blocking screens 57a and 57b. Further, it is determined by comparing the evaporating temperature value of the refrigerant detected by the refrigerant temperature sensor 3 with a predetermined set value, and a control signal for moving the air path blocking screens 57a and 57b is transmitted to the air path blocking screen. Drive device 5
A control unit 60 for outputting to 9a and 59b is provided.

The operation of the above configuration will be described below. A region where the core length of the heat exchanger 1 is divided into three equal parts is a refrigerant temperature sensor 3
Area C, area B, and area A from the side.
When the heat exchanger 1 is used as an evaporator, frost forms on the surface of the heat exchanger 1, and when it starts to grow, the evaporation temperature of the refrigerant in the heat exchanger decreases. When the detected refrigerant evaporation temperature value is the set temperature K1> the refrigerant evaporation temperature value> the set temperature K2 and the air passage blocking screen 57
a, 57b in an initial state in which the heat exchanger 1 is not blocked at all (a state in which the heat exchanger 1 is completely folded and housed in a pleated shape)
In the case of, the airflow cutoff screens 57a and 57b are switched between the area B and the area C by the control signal output from the control unit 60.
By moving on the rail to the position that blocks both
The wind that had passed through the entire surface of the heat exchanger 1 until then
In this case, the wind speed of the wind passing through the heat exchanger increases, and the heat exchange efficiency on the air side decreases.

Accordingly, as the evaporating capacity of the heat exchanger 1 decreases, the condensing ability also deteriorates, and the cycle balance is lost. Growth can be inhibited.
When the elapsed time in that state exceeds the set time T8, the control signal output from the control unit 60 moves the air path cutoff screens 57a and 57b on the rail to a position where both the area A and the area C are cut off, It can be led to the heat exchanger part of area B. Thereafter, the control unit 6 is activated at every set time T8.
By controlling from 0, the air path cutoff screens 57a, 57a
b moves the rail to a specific position in conjunction with it, thereby guiding wind to a part of the heat exchanger 1, slowing down the rate of decrease in the evaporation temperature of the refrigerant, and inhibiting growth of frost. .

FIG. 22 is a flowchart showing a control method used by the control unit 60 according to the present invention. First, when the operation switch of the air conditioner is turned on, from the start which is the seventh step, in the 47th step, a command to move to the initial state in which the air path cutoff screens 57a and 57b do not block the heat exchanger 1 at all is issued. Airway blocking screen drive 5
9a and 59b. In the ninth step, the process proceeds to detection of the evaporation temperature of the refrigerant obtained by the refrigerant temperature sensor 3,
In the tenth step, the evaporating temperature of the refrigerant is compared with the set temperature K1. If the evaporating temperature of the refrigerant is lower than the set temperature K1, the process proceeds to the eleventh step. If the evaporating temperature of the refrigerant is higher than the set temperature K1, the process proceeds to the ninth step. To return. Also, the first
In one step, the evaporating temperature of the refrigerant is compared with the set temperature K2. If the evaporating temperature of the refrigerant is higher than the set temperature K2, the fourth step is performed.
Proceeding to step 8, if the evaporating temperature of the refrigerant is lower than the set temperature K2, proceeding to step 15 to output a four-way valve de-ice operation command. In a forty-eighth step, the current elapsed time of the air path cutoff screens 57a and 57b is calculated.
In the fifty-fifth step, the air path blocking screen 57
The current elapsed times a and 57b are compared with the set time T8, and if the elapsed time is longer than the set time T8, the process proceeds to a step 56. If the current status is the initial state, the process proceeds to a position where both the area B and the area C are shut off. If the current state is a state in which both the area B and the area C are blocked, the position of the area A and the area C is blocked. To the position where both are blocked, to the position where only area C is blocked if the current condition is that both area A and area B are blocked, to the position where only area A is blocked if the current condition is that only area C is blocked. If only the area A is shut off, an operation command is issued to move the air path cutoff screens 57a, 57b to the initial state.
9b. If the elapsed time is shorter than the set time T8, the process returns to the ninth step. When the operation switch is turned off, END is set in the seventeenth step. However, the set temperature K1> the set temperature K2.

In the embodiment, the air path cutoff screens 57a, 57a,
7b is moved in the longitudinal direction with respect to the entire surface of the heat exchanger 1. However, even if the air path blocking screens 57a and 57b are installed so as to move in the vertical direction with respect to the entire surface of the heat exchanger 1, Well, there is no difference in the effects.

Further, the entire surface of the heat exchanger 1 is divided into three equal parts to form area A, area B, and area C.
Although the moving positions of 7a and 57b are determined, it goes without saying that instead of dividing the entire surface of the heat exchanger 1 into three equal parts, four or five equal parts may be used.

[0077]

As is clear from the above embodiment, according to the present invention, when the heat exchanger is used as an evaporator, the wind direction setting plate is operated to pass the entire surface of the heat exchanger until then. By guiding the generated wind to a certain heat exchanger portion, the wind speed of the wind passing through the heat exchanger portion increases, and the heat exchange efficiency on the air side decreases. Therefore, as the evaporating capacity of the heat exchanger decreases, the cycle balance collapses and the condensing capacity also decreases, and the rate of refrigerant temperature decrease slows down to move and stabilize the cycle to a lower output cycle than before. Since the growth of frost can be inhibited, the switching interval to the defrosting operation can be lengthened, and an frost prevention device for an air conditioner can be provided which is effective in preventing dissatisfaction due to insufficient heating capacity.

When the heat exchanger is used as an evaporator, the wind path changing plate is moved to guide a part of the wind that has passed through the entire surface of the heat exchanger to the bypass air path. The amount of air passing through the heat exchanger part is reduced, and the amount of heat exchange as an evaporator is reduced. Therefore, as the evaporation capacity of the heat exchanger is reduced, the cycle balance is lost and the condensation capacity is also reduced. Since the growth of frost can be inhibited, the switching interval to the defrosting operation can be lengthened, and an frost formation prevention device for an air conditioner can be provided which is effective in preventing deterioration of the air conditioning feeling during the heating operation.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a frost prevention device for an air conditioner according to a first embodiment of the present invention.

FIG. 2 is an operation pattern diagram of a wind direction setting plate according to embodiments 1, 3, 4, and 5 of the present invention.

FIG. 3 is a sectional view showing an operation state of the frost prevention device for the air conditioner according to the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating a control method of a control unit according to the first embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of a frost prevention device for an air conditioner according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating an operation state of the frost prevention device for the air conditioner according to the second embodiment of the present invention.

FIG. 7 is a flowchart illustrating a control method of a control unit according to the second embodiment of the present invention.

FIG. 8 is a side view showing a configuration of a frost prevention device for an air conditioner according to a third embodiment of the present invention.

FIG. 9 is a cross-sectional view illustrating an operation state of the frost prevention device for the air conditioner according to the third embodiment of the present invention.

FIG. 10 is a flowchart illustrating a control method of a control unit according to a third embodiment of the present invention.

FIG. 11 is a side view showing a configuration of a frost prevention device for an air conditioner according to a fourth embodiment of the present invention.

FIG. 12 is a cross-sectional view illustrating an operation state of an frost prevention device for an air conditioner according to a fourth embodiment of the present invention.

FIG. 13 is a flowchart illustrating a control method of the control unit according to the fourth embodiment of the present invention.

FIG. 14 is a side view illustrating a configuration of a frost prevention device for an air conditioner according to a fifth embodiment of the present invention.

FIG. 15 is a sectional view showing an operation state of the frost prevention device for an air conditioner according to the fifth embodiment of the present invention.

FIG. 16 is a flowchart illustrating a control method of the control unit according to the fifth embodiment of the present invention.

FIG. 17 is a plan view illustrating a configuration of a frost prevention device for an air conditioner according to a sixth embodiment of the present invention.

FIG. 18 is a flowchart illustrating a control method of the control unit according to the sixth embodiment of the present invention.

FIG. 19 is a plan view showing a configuration of a frost prevention device for an air conditioner according to a seventh embodiment of the present invention.

FIG. 20 is a flowchart illustrating a control method of the control unit according to the seventh embodiment of the present invention.

FIG. 21 is a plan view showing a configuration of a frost prevention device for an air conditioner according to an eighth embodiment of the present invention.

FIG. 22 is a flowchart illustrating a control method of the control unit according to the eighth embodiment of the present invention.

FIG. 23 is a refrigeration cycle diagram of a conventional air conditioner.

FIG. 24 is a sectional view showing a configuration of a conventional frost prevention device for an air conditioner.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat exchanger 2 blower 3 refrigerant temperature sensor 4a wind direction setting plate 4b wind direction setting plate 4c wind direction setting plate 5a motor for wind direction setting plate 5b motor for direction setting plate 5c motor for direction setting plate 6 control unit 18a wind direction changing plate 18b wind Road change plate 19a Motor for wind change plate 19b Motor for wind change plate 20a Bypass air passage 20b Bypass air passage 21 Control unit 26 Control unit 30a Temperature sensor 30b Temperature sensor 30c Temperature sensor 31 Control unit 35a Wind direction setting plate 35b Wind direction setting Plate 35c Wind direction setting plate 35d Wind direction setting plate 35e Wind direction setting plate 35f Wind direction setting plate 43 Air path cutoff screen 44 Rail 45 Air path cutoff screen driving device 46 Control unit 51a Air path cutoff screen 51b Air path cutoff screen 53a Air path cutoff screen Drive device 53b Airway blocking screen Use the drive device 54 control unit 57a air passage blocking screen 57b air path blocking screen

Claims (8)

[Claims] 1. A heat exchanger, a blower, a refrigerant temperature sensor for measuring a refrigerant temperature, a plurality of wind direction setting plates on the windward side of the heat exchanger, the angle direction of which can be changed along a flow of wind, and the wind direction. A wind direction setting plate motor for driving the setting plate, and a control for comparing and judging the evaporation temperature value of the refrigerant detected by the refrigerant temperature sensor with a predetermined set value, and outputting a control signal to the wind direction setting plate motor. Anti-frost device for air conditioners with a section. 2. A heat exchanger, a blower, a refrigerant temperature sensor for measuring a refrigerant temperature, and a blower which partially exists in an air passage and moves in the longitudinal direction of the heat exchanger to partially cut off the air flow to cut off the air passage. An air path changing plate to be changed, a motor for the air path changing plate that drives the air path changing plate, a bypass air path that opens and closes as the air path changing plate moves, and an evaporation temperature value of the refrigerant detected by the refrigerant temperature sensor. A frost formation prevention device for an air conditioner, comprising: a control unit for comparing and judging a preset value with a preset value and outputting a control signal to the motor for the airflow path changing plate. 3. An air flow path changing plate which is present in an air path and partially cuts off the air flow by moving in the longitudinal direction of the heat exchanger to change the air path, and an air path changing apparatus for driving the air path changing plate. A plate motor, and a bypass air passage that opens and closes as the air passage change plate moves.
A control unit for comparing and judging the evaporation temperature value of the refrigerant detected by the refrigerant temperature sensor with a predetermined set value, and outputting a control signal to the motor for the wind direction setting plate and the motor for the air flow path changing plate. Item 1. A frost prevention device for an air conditioner according to Item 1. 4. A plurality of temperature sensors between the heat exchanger and the blower on each leeward side of the wind direction setting plate, and a comparison between a predetermined value and an evaporation temperature value of the refrigerant detected by the refrigerant temperature sensor. 4. The frost prevention apparatus for an air conditioner according to claim 1, further comprising: a control unit that determines a detection value of the temperature sensor and outputs a control signal to a motor for a wind direction setting plate. 5. The frost prevention device for an air conditioner according to claim 4, wherein a plurality of wind direction setting plates are provided. 6. A heat exchanger, an air blower, a refrigerant temperature sensor for measuring a refrigerant temperature, an air passage blocking screen on the windward side of the heat exchanger, a rail for moving the air passage blocking screen, A driving device for an air passage blocking screen, which compares and judges a refrigerant evaporation temperature value detected by the refrigerant temperature sensor with a predetermined set value, and outputs a control signal to the driving device for the air passage blocking screen. A frost prevention device for an air conditioner having a control unit that performs the control. 7. The air flow blocking screen according to claim 6, further comprising a plurality of air flow blocking screens, and a control unit for outputting a control signal for resetting an interval between the air flow blocking screens to a drive device for the air flow blocking screen. A frost prevention device for air conditioners. 8. The frost prevention device for an air conditioner according to claim 6, further comprising an air passage blocking screen that is folded and stored in a pleated shape.