KR102014022B1 - Control apparatus for sensing frost and defrosting in refrigeration cycle - Google Patents

Abstract

The present invention is a case installed outside; A body installed inside the case; A cooling fan installed at the front of the case and driven by the fan motor to suck and circulate air from the rear to the front; A refrigerant pipe disposed in a zigzag closed loop inside the main body to circulate the refrigerant; And an evaporator having a plurality of endothermic fins disposed inside the main body and disposed in the orthogonal direction to the refrigerant pipe so that the refrigerant pipe is coupled through and cooled by the refrigerant to exchange heat with the outside. The device is made of a bracket installed in the rear of the case; A velocity sensor coupled to the bracket and disposed to face a portion where the refrigerant pipe and the heat absorbing fin are installed, measuring a passage speed of the air sucked into the case, and transmitting a measured value to the controller; A controller which receives the measured value measured by the speed sensor, detects a drop generated in the refrigerant pipe or the heat absorbing fin by comparing with a reference value, and transmits a defrost signal to the defrosting device when the drop is detected; And a defrost apparatus for receiving a defrost signal from the controller to remove the defrost generated in the evaporator.

Description

Dropping detection and defrosting devices for refrigeration cycles {CONTROL APPARATUS FOR SENSING FROST AND DEFROSTING IN REFRIGERATION CYCLE}

The present invention relates to a dropping detection and defrosting device of the refrigeration cycle, and more particularly, to detect the frost formed on the evaporator by using the passage speed of the air sucked into the evaporator, and to detect the dropping of the refrigeration cycle to remove it And a defrosting device.

Generally, a freezer is installed to freeze and store an object to lower the temperature by absorbing heat inside the freezer using a coolant supplied at a low temperature in a liquid state.

As shown in FIG. 1A, the refrigerator 1 has a compressor 2, a condenser 3, an expansion valve 4, and an evaporator 5 as essential components, and the high temperature and high pressure compressed in the compressor 2 are included. The refrigerant vapor is cooled in the condenser (3) to liquefy, stored in the receiver and expanded in the expansion valve (4), and when the refrigerant evaporates in the evaporator (5) by the heat of evaporation to absorb the heat inside the freezer to increase the temperature It has a refrigeration cycle of freezing to freeze stored articles. In addition, an oil separator 6 is installed between the compressor 2 and the condenser 3, and a receiver 7 is installed between the condenser 3 and the expansion valve 4, and an evaporator 5 and A liquid separator 8 may be installed between the compressors 2.

In addition, the compressor 2 absorbs heat inside the freezer while passing through the evaporator 5 to compress the refrigerant gas having a high temperature, and the condenser 3 has a high temperature and high pressure compressed by the compressor 2. It condenses to lower the temperature of the refrigerant to liquefy, the expansion valve (4) is to supply the refrigerant liquefied by the condenser (3) to the evaporator, the evaporator (5) is installed inside the freezer to liquid By using the refrigerant supplied at a low temperature of the state to absorb the heat inside the freezer to lower the temperature.

In this case, as shown in FIG. 1B, the evaporator 5 includes a case 5a of the main body, and a plurality of thin endothermic fins 5b having excellent heat transfer efficiency are uniformly spaced inside the case 5a. The refrigerant pipe 5c, which is fixedly installed, is piped in the form of a closed loop of zigzag and penetrated to each of the heat absorbing fins 5b, thereby being forced together with the compressed refrigerant generated from the compressor. When the refrigerant circulated and passing through the refrigerant pipe 5c passes through the portion where the heat absorbing fins 5b are installed, the heat absorbing fin is formed while heat is exchanged between the heat absorbing fins 5b cooled by the coolant and the air surrounding them. 5b) is to be frozen by the principle that the temperature of the space is installed is rapidly lowered.

However, in the refrigerator, dew forms on the surface of the endothermic fin during heat exchange between the endothermic fin of the evaporator cooled by the circulation of the refrigerant and the surrounding air, and the dew freezes due to the low temperature of the endothermic fin. Will form frost.

In addition, as the refrigerating cycle is repeated as time passes, the thickness of the frost formed on the surface of the heat absorbing fin becomes thicker and the gap between the fins becomes narrower. This may adversely affect the compressor, such as the occurrence of liquid compression, and may cause malfunction of the refrigerator.

Therefore, a defrosting operation is required to remove frost formed on the refrigerant pipe and the endothermic fin of the evaporator, which is partially inserted into the endothermic fin of the evaporator and then heated. Defrosting method using electric heater, Defrosting method using hot gas to circulate the compressor by using hot gas of high temperature and high pressure, Defrost water injection to force spray of defrosting water by pumping by placing nozzle on the upper side of evaporator There are methods by various defrosting apparatuses such as the defrosting method used.

In addition, as a control method for performing the defrosting operation, a timer is installed in the defrosting device to control defrosting at regular intervals, or the defrosting device is controlled to be operated when the thickness of the defrost is measured by a dew condensation sensor numerically. As described in the measurement defrosting method, Patent Document 1, there is a method for performing the defrosting operation at the time of energizing by sensing the current flow of the dropping and the sensing member generated in the endothermic fin of the evaporator.

However, the method of controlling to defrost at regular cycles is to operate the defrosting system automatically at a fixed time regardless of the thickness or quantity of the drop, so that unnecessary defrosting takes place, resulting in an increase in the internal temperature and deterioration of the quality of the stored object. Energy loss, defrosting is incomplete, and the accumulation of droppings may cause the evaporator to be broken down or the piston may be damaged by the liquid compression of the compressor, and the maintenance and repair costs may be excessively shortened by shortening the component life of the defrosting device. there is a problem.

In addition, the defrost control method by measuring the accumulated thickness of the dew condensation sensor has a problem that it is difficult to control in accordance with various weather conditions at the installation site of the evaporator or the structure of the heat exchanger, in particular, the optical narrowness of the gap between the fins.

In addition, the method of sensing defrost generated on the heat absorbing pin and the sensing member and conducting defrosting during energization is not performed because electricity is not well communicated with the defrost having the form of solid ice. There is a problem that it is difficult to detect and difficult to perform an effective defrosting operation.

In addition, there is a conventional technology in which the defrosting operation is performed by detecting the dropping by the signal of the sensor by installing a number of sensors in the evaporator, but as a result of the technical problem often occurs sensor malfunction as a result of difficult installation There is.

Republic of Korea Patent Registration No. 10-1403120 (Jun. 3, 2014)

The present invention has been made to solve all the above-described problems, by using a speed sensor for measuring the wind speed of the air sucked into the evaporator, it is possible to detect the droplets accumulated on the evaporator in the refrigeration cycle and to remove them efficiently. Its purpose is to provide a defrost detection and defrosting device for a refrigeration cycle.

The present invention in order to solve the above problems is installed outside; A body installed inside the case; A cooling fan installed at the front of the case and driven by the fan motor to suck and circulate air from the rear to the front; A refrigerant pipe disposed in a zigzag closed loop inside the main body to circulate the refrigerant; And an evaporator having a plurality of endothermic fins disposed inside the main body and disposed in the orthogonal direction to the refrigerant pipe so that the refrigerant pipe is coupled through and cooled by the refrigerant to exchange heat with the outside. The device is made of a bracket installed in the rear of the case; A velocity sensor coupled to the bracket and disposed to face a portion where the refrigerant pipe and the heat absorbing fin are installed, measuring a passage speed of the air sucked into the case, and transmitting a measured value to the controller; A controller which receives the measured value measured by the speed sensor, detects a drop generated in the refrigerant pipe or the heat absorbing fin by comparing with a reference value, and transmits a defrost signal to the defrosting device when the drop is detected; And a defrost apparatus for receiving a defrost signal from the controller to remove the defrost generated in the evaporator.

According to the present invention, if the drop is formed in the evaporator to a predetermined thickness, the flow of air sucked into the inside decreases and the passage speed of the air decreases, thus detecting the drop by the speed sensor and accurately detecting the drop of the evaporator. Defrost can be removed and defrost is made by sending the defrost signal at the optimum defrost timing.If the operating time is set or the temperature of the heat absorbing fin rises above the reference value, the defrosting operation can be terminated to save energy and freeze the freezer. The efficiency is improved.

In addition, by eliminating the incomplete defrosting to prevent the breakage of the evaporator and the occurrence of liquid compression of the compressor, the failure rate is reduced, the product reliability is increased, the parts life of the freezer is increased, maintenance and repair costs are reduced.

In addition, the structure is simple and easy to install, the position of the speed sensor can be adjusted, can be applied to the structure of various evaporators, it can perform accurate drop detection and efficient defrost operation.

Figure 1a is a view showing the configuration of a general refrigeration cycle, Figure 1b is a view showing the configuration of a general evaporator.
Figure 2a is a perspective view of an evaporator according to an embodiment of the present invention, Figure 2b is a side cross-sectional view of the evaporator.
3 is an overall configuration diagram of the accumulation detection and defrosting device of the refrigeration cycle according to an embodiment of the present invention.
Figure 4 is a perspective view of the drop detection and defrosting device of the refrigerating cycle installed in the evaporator according to an embodiment of the present invention.
5 is a perspective view of a drop detection and defrosting device of the refrigeration cycle installed in the evaporator according to another embodiment of the present invention.
6 is a state diagram used in the image detection according to an embodiment of the present invention.

Hereinafter, with reference to the drawings will be described in detail with reference to specific embodiments for carrying out the accumulation detection and defrosting device of the refrigeration cycle according to the present invention.

The dropping detection and defrosting device of the refrigeration cycle according to the present invention is to detect the frost formed on the evaporator by using the passage speed of the air sucked into the evaporator and to remove it, as shown in FIG. 1A. The refrigeration cycle of) comprises a compressor (2), a condenser (3), an expansion valve (4) and an evaporator (5) as components, the compressor (2) passes through the evaporator (5) to absorb heat inside the freezer To compress the refrigerant gas having a higher temperature, and the condenser 3 condenses the liquid to lower the temperature of the refrigerant of the high temperature and high pressure compressed by the compressor 2 to condense it. The refrigerant liquefied by the condenser (3) is supplied to the evaporator, the evaporator (5) is installed inside the freezer to absorb the heat of the inside of the freezer using a refrigerant supplied at a low temperature of the liquid state It will lower the road.

2A and 2B, the evaporator 5 is installed at the front of the case 5a, the main body 5-1 installed inside the case, and the case 5a. A cooling fan 5b which is driven by the air) and sucks and circulates the air from the rear to the front, and a refrigerant pipe 5c in which the refrigerant is circulated by being disposed in a closed loop of a zigzag form inside the main body 5-1. And a plurality of endothermic fins 5d provided inside the main body 5-1 and disposed in the orthogonal direction to the coolant pipe 5c so that the coolant pipe 5c is penetrated and cooled by a coolant to exchange heat with the outside. It is made to include.

As shown in FIG. 3, the dropping detection and defrosting device of the refrigeration cycle of the present invention is largely a bracket 10, a speed sensor 20, a controller 30, an operating means 40, a defrosting device 50 and It may be configured to include all or part of the thermocouple 60.

Referring to FIG. 4, the bracket 10 is installed at the edge of the rear of the case to support the speed sensor 20 coupled thereto.

The speed sensor 20 is coupled to the bracket so as to extend toward the portion where the refrigerant pipe 5c and the endothermic fin 5d are installed, and the air sucked into the main body 5-1 from the rear of the evaporator 5 It measures the passing speed passing toward the front and the measured value is transmitted to the controller (30).

At this time, the speed sensor 20, the fixing piece 21 is provided at one end is fixedly coupled to the bracket 10, the rotating fan 22 is provided at the other end and a plurality of wings are formed cooling fan ( 5b) measures the passing speed of the air flowing through the inside of the evaporator 5 while rotating by the flow of air sucked from the rear of the evaporator 5, and the fixing piece 21 and the rotating fan 22 are connected to the connecting table ( 23, the signal line 24 is connected to the fixing piece 21 so that the measured value of the passing speed is periodically updated and transmitted to the controller 30.

During operation of the refrigeration cycle, the droplets are generated in the refrigerant pipes 5c and the heat absorbing fins 5d of the evaporator 5, and as the thickness of the droplets gradually increases over time, they are sucked by the cooling fan 5b. As the flow of air passing through the inside of the evaporator 5 is lowered, the passage speed of the air is reduced. Therefore, by installing the speed sensor 20 through the bracket 10 in the case 5a on the rear side of the evaporator 5 and measuring the air passing speed, the refrigerant pipe 5c and the endothermic fin of the evaporator 5 ( 5d) can detect the dropping occurs, defrost signal can be sent to the defrosting device 50 at the optimum defrost timing to perform defrosting operation to reduce energy consumption, such as electricity, product quality is improved, The malfunction of the freezer can be prevented.

The controller 30 continuously receives the measured value measured by the speed sensor 20 and continuously detects the drop generated in the coolant pipe 5c or the heat absorbing fin 5d by comparing with a preset reference value, and detecting the drop of water. The defrosting operation is performed by transmitting a defrost signal to the defrosting device 50 to remove the timely image.

To this end, the controller 30 is a control unit 31 for controlling the operation of the fan motor, the speed sensor 20, the defrosting device 50, the thermocouple 60 and the like, the contact signal and the speed sensor 20 of the fan motor Receiver 32 for receiving signals such as the measured value of the thermocouple and the measured value of the thermocouple 60, the display unit 33 on which the measured value measured by the speed sensor 20 is displayed on the screen, Set the timer unit 34 which can be set in advance by setting the delay time and the operation time of the operation, and the reference value for comparing with the measured value measured by the speed sensor 20 for detecting the dropping, and for the end of the defrosting. The reference value setting unit 35 sets a reference value for comparison with the measured value of the thermocouple 60, and compares the measured value and the reference value received from the speed sensor 20 to determine whether or not it is an enemy and receives from the thermocouple 60. Comparison determination unit 36 to determine whether the end of the defrost by comparing the temperature measured value with the reference value And a transmitter 37 for transmitting a defrost signal or an end signal of the defrosting operation to the defrosting device 50 according to the determination of the comparison determining unit 36, and an alarm unit for outputting an alarm signal when an abnormality of the fan motor is detected. 38).

Referring to FIG. 5, the operation means 40 is installed near the bracket 10 at the rear case 5a of the evaporator 5 to move the bracket 10 in both directions, and to position the speed sensor. As the measured values can be obtained at multiple positions while adjusting, accurate drop detection and efficient defrosting operation can be performed, eliminating incomplete defrosting, preventing breakage of the evaporator and occurrence of liquid compression of the compressor, and reducing the failure rate. Increased reliability and longer parts life of the unit reduce maintenance and repair costs.

To this end, the operation means 40 has a pair of fixing rods 42 spaced apart from each other at the rear ends of the case 5a, and a screw rod 43 is disposed between the pair of fixing rods 42 at both ends. The screw rod 43 is coupled through the lower portion of the holder 42, the operating motor 41 is installed on one side of the screw rod 43 and the operating motor 41 is connected to the screw rod 43 to operate the motor The operation of the 41 causes the screw rod 43 to rotate in the forward or reverse direction. In addition, the connecting bar 44 is arranged side by side on the upper side of the screw bar 43 between the pair of fixing brackets 42 at both ends, the connecting bar 44 is coupled to the upper portion of the fixing table 42 and the longitudinal direction therein Along the groove 44a is formed.

Then, the moving block 11 is formed in the lower portion of the bracket 10, the moving block 11 is fastened through the screw rod 43, the rotation of the screw rod 43 according to the operation of the operating motor 41 It is installed so that movement in both directions is possible. In addition, the auxiliary block 12 is formed on the upper portion of the bracket 10, the auxiliary block 12 is fastened to the moving groove (44a) can move together when the moving moving block 11, the moving block 11 ) And the auxiliary block 12 is connected to the connecting bar (13). As described above, the bracket 10 may move slowly without shaking while the auxiliary block 12 is supported by the connecting bar 44 while the moving block 11 is coupled to the screw rod 43. The connected speed sensor 20 is also firmly supported so that a more accurate measurement value can be measured.

When the defrosting device 50 receives the defrosting signal from the controller 30, the defrosting device 50 performs the defrosting operation until the end signal reaches the defrosting device. The defrosting device 50 stores the accumulated defrosting on the refrigerant pipe 5c or the endothermic fin 5d of the evaporator 5. Remove As a means for this, the electric heater is inserted into the refrigerant pipe 5c or the endothermic fin 5d of the evaporator 5 and then heated, or the compressor 2 is circulated using hot gas of high temperature and high pressure. For example, devices for forcibly spraying defrost water by pumping by placing a nozzle on the upper side of the evaporator 5 may be used. Since the defrosting device 50 is a commonly known means used, a detailed description thereof will be omitted. .

The thermocouple (T / C, 60) is installed in the case (5a) of the evaporator (5), the thermometer to measure the temperature using the thermoelectric power, by joining one end of the two metal wires After forming the temperature-contacting point, the temperature-contacting point is placed on the heat absorbing fin 5d as the part to be measured, and the temperature of the measurement part can be known by measuring the thermoelectric power with the other end of the cold junction as the reference temperature. In this case, a converter for converting a voltage generated by the temperature into a DC signal may be provided. The thermocouple 60 generates a voltage signal according to the temperature of the heat absorbing fin 5d, which is a measurement part, and the voltage signal is converted by the converter and transmitted to the controller 30, and the controller 30 receives a signal from the converter. When the temperature of the heat absorbing fin 5d is higher than or equal to the reference value, the signal is raised above the reference value, and the end signal of the defrosting operation is transmitted to the defroster 50 to terminate the defrosting operation.

Hereinafter, with reference to the drawings will be described an embodiment with respect to the action of the drop detection and defrosting device of the refrigeration cycle according to the present invention.

First, the bracket 10 is fixedly coupled to one side of the rear side of the case 5a of the evaporator 5 by a fixing member or movably coupled to the operating means 40, and the speed sensor 20 is fixed to the bracket 10. The speed sensor 20 is arranged to extend toward a portion where the refrigerant pipe 5c and the heat absorbing fin 5d are installed, and connects the signal line 24 of the speed sensor 20 to be connected to the controller 30. Install. In addition, the thermocouple 60 is installed on one side of the back of the case 5a of the evaporator 5, but one end of two kinds of metal wires is joined to form a temperature contact point, and then placed on the heat absorbing fin 5d. Prepare the thermoelectric power by measuring the cold junction at one end as the reference temperature.

Thereafter, the controller 30 starts a refrigeration cycle to start the freezing operation of the freezer 1, and the air is sucked from the rear of the evaporator 5 so that the refrigerant pipe 5c and the heat absorbing fin 5d are installed. After passing through, the air is discharged toward the front to circulate the air. As the refrigerant 1 is used, the refrigerant is forcedly circulated together with the compressed air generated from the compressor 2 to cool down while passing through the refrigerant pipe 5c. As the heat exchange occurs between the heat absorbing fins 5d and the surrounding air, the temperature inside the refrigerator is lowered, and thus the refrigeration is performed. As time passes, the refrigerant pipe 5c or the heat absorbing fins 5d are subjected to heat exchange. Dew is formed on the surface of the coolant, and the dew freezes by the low temperature of the coolant pipe 5c and the heat absorbing fins 5d to form a frost, and the thickness thereof becomes thicker, so that the coolant pipe 5c or the heat absorbing fins 5d are formed. Liver between) The pole becomes narrower, and the accumulated image accumulated in a predetermined thickness is implanted on the refrigerant pipe 5c or the heat absorbing fin 5d.

At this time, the speed sensor 20 measures the passage speed of the wind passing through the air sucked into the rear from the rear of the evaporator 5 toward the front, and the measured value of the passage speed is periodically updated and transmitted to the controller 30. do. After the dropping occurs in the refrigerant pipe 5c or the endothermic fin 5d of the evaporator 5 during operation of the refrigeration cycle, the thickness of the dropping layer F becomes thicker as time passes. As the flow of air passing through the inside is reduced, the passage speed of the air decreases, and the controller 30 continuously receives the measured value of the passage speed from the speed sensor 20 and displays it on the display unit 33. When the measured value is smaller than the reference value compared to the preset reference value, it is detected that the dropping is detected and defrosting operation is necessary, and the controller 30 stops the freezing operation by stopping the operation of the cooling fan 5b to remove the dropping. Then, the defrosting signal is transmitted to the defrosting device 50 so that the defrosting operation is performed.

In this case, the controller 30 transmits the defrost signal to the defrosting device 50 only when the operation signal of the fan motor is received by the receiver 32 and the fan motor is normally operated. The defrosting operation can be set only after a normal air passing speed is generated with a delay time of about a minute. If the air passing speed is detected as 0 m / s within the delay time, it is determined that the fan motor is abnormal. Alarm signal is output through (38) to not perform defrosting operation. In addition, during the defrosting operation, the time of the defrosting operation set in advance in the timer unit 34 ends, or generates a voltage signal according to the temperature of the heat absorbing pin 5d, which is a measurement portion of the thermocouple 60, and the voltage signal is transmitted to the converter. The controller 30 receives the signal from the converter and determines that the temperature of the heat absorbing fin 5d is greater than or equal to the reference value, and the transmitter 37 transmits the end signal of the defrosting operation to the defrosting device 50. ) To complete the defrosting operation. After the defrosting operation is completed, the refrigerator 1 is operated by switching to the freezing operation.

Eventually, the dropping detection and defrosting device of the refrigerating cycle according to the present invention detects the dropping by the speed sensor because when the dropping is formed in the evaporator to a predetermined thickness, the flow of air sucked into the inside decreases and the passage speed of the air decreases. Defrost can be accurately detected by the evaporator, and it can be removed, and defrosting is performed by sending the defrost signal at the optimum defrost timing, and the operation time is set or the defrosting operation is terminated when the temperature of the heat absorbing fin rises above the reference value. It can save energy, improve the refrigeration efficiency of the freezer, and also solve the incomplete defrosting to prevent the breakage of the evaporator and the occurrence of liquid compression of the compressor, reduce the failure rate to increase product reliability and increase the life of parts of the freezer And the maintenance and repair costs are reduced, and the structure is simple and easy to install. It can adjust the position, can be applied to the structure of various evaporators, it is possible to perform accurate drop detection and efficient defrost operation.

In the present invention, the above embodiment is only one example, and the present invention is not limited thereto. Anything that has substantially the same configuration as the technical idea described in the claims of the present invention and achieves the same effect is included in the technical scope of the present invention.

1. freezer 2. compressor
3. Condenser 4. Expansion Valve
5. Evaporator 5-1. main body
5a. Case 5b. Cooling fan
5c. Refrigerant pipe 5d. Endothermic fin
6. Oil separator 7. Fluid receiver
8. Liquid separator 10. Bracket
11. Moving block 12. Secondary block
13. Connecting rod 20. Speed sensor
21. Fixed piece 22. Rotating fan
23. Connecting rod 24. Signal line
30. Controller 31. Controller
33. Display unit 34. Timer unit
40. Actuating means 41. Actuating motor
42. Retention Base 43. Screw Rod
44. Connection bar 44a. Home
50. Defroster 60. Thermocouple
F. Enemy

Claims (6)

Cooling to circulate the case (5a) provided on the outside, the main body (5-1) installed inside the case (5a) and the case (5a) is driven in front of the case (5a) and driven by a fan motor to suck air from the rear to the front It is arranged inside the fan 5b and the main body 5-1 in the form of a closed loop in a zigzag form and is provided inside the main body 5-1 and the coolant pipe 5c through which the coolant is circulated. Defrost is detected in a refrigerating cycle including an evaporator 5 having a plurality of endothermic fins 5d having a plurality of endothermic fins 5d arranged in an orthogonal direction, through which the refrigerant pipe 5c is coupled through and cooled by a refrigerant to exchange heat with the outside. With the device made up,
A bracket 10 installed at the rear of the case 5a;
It is coupled to the bracket 10 and disposed to face a portion where the refrigerant pipe 5c and the heat absorbing fin 5d are installed, and measure the passage speed of the air sucked into the case 5a, and transmit the measured value to the controller. A speed sensor 20;
A controller that receives the measured value measured by the speed sensor 20 and compares the reference value with the reference value to detect the drop generated in the coolant pipe 5c or the heat absorbing fin 5d, and transmit the defrost signal to the defrosting device upon detection of the drop. 30 and
It includes a defrosting device 50 for receiving a defrost signal from the controller 30 to remove the defrost generated in the evaporator (5),
The speed sensor 20, the fixing piece 21 is fixedly coupled to the bracket 10; A rotating fan 22 having a plurality of blades formed therein and measuring a passage speed of the air while rotating by a flow of air sucked by the cooling fan; It consists of a connecting table 23 for connecting the fixed piece 21 and the rotating fan 22 and a signal line 24 connected to the fixed piece 21,
A pair of fixing stands 42 installed at the rear of the case 5a and installed at both ends of the case 5a; A screw rod 43 disposed between the lower ends of the fixing members 42 and rotated by the operation motor 41; Actuating means comprising a connecting bar 44 is disposed penetrating between the operating motor 41 and the upper end of the fixing table 42 of the both ends installed on one side of the screw rod 43, the moving groove 44a is formed therein. Further includes 40,
The bracket 10 includes a moving block 11 provided at a lower portion thereof, the screw rod 43 penetratingly coupled to move in both directions by the rotation of the screw rod 43; It is provided on the upper side, and includes an auxiliary block 12 that is fastened to the movable groove (44a) and the connecting block 13 for connecting the moving block 11 and the auxiliary block 12,
The controller 30, the control unit 31 for controlling the operation of the fan motor, the speed sensor 20 and the defrosting device; A receiver 32 receiving a signal from the fan motor and the speed sensor 20; A display unit 33 on which a measured value measured by the speed sensor 20 is displayed on a screen; A timer unit 34 for setting a delay time and an operation time of defrosting operation; A reference value setting unit 35 for setting a reference value; A comparison determination unit 36 for comparing the measured value received from the speed sensor 20 with a reference value to determine whether or not an enemy is loaded; In accordance with the determination of the comparison determination unit 36 includes a transmitter 37 for transmitting a defrost signal to the defrosting device 50 and an alarm unit 38 for detecting an abnormality of the fan motor and outputting an alarm signal,
The controller 30 transmits the defrost signal to the defrosting device 50 in a state in which the operation signal of the fan motor is received, and after the start of the refrigeration cycle, gives a predetermined delay time to defrost the normal air passage speed. When the measured value of the speed sensor is lower than the reference value within the delay time, the alarm signal is output over the fan motor and the defrosting operation is not performed. When the preset operation time is reached, the defrosting device ends the defrosting device. Drop detection and defrosting device of the refrigeration cycle, characterized in that for transmitting to.
delete delete delete delete The method of claim 1,
It is installed in the case (5a) of the evaporator (5) is a drop of the refrigeration cycle characterized in that it further comprises a thermocouple 60 for generating a voltage signal according to the temperature of the heat absorbing fin (5d) and transmits to the controller 30 Detection and defrosting device.

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