KR100586150B1 - Outdoorunit equipped with Device for Preventing reverse rotation of Motor Shaft - Google Patents

Abstract

A one-way clutch is provided on the rotating shaft of the driving motor for driving the cooling fan to prevent the reverse rotation of the cooling fan by the reverse wind blowing from the outside. The outdoor unit is provided with a rotating shaft reverse rotation prevention device,

To this end, the present invention, in order to increase the cooling efficiency of the compressed refrigerant after being introduced from the indoor unit, in the outdoor unit for an air conditioner for rotating the cooling fan to the drive motor for forced ventilation of the outside air to the condenser, on the axis of rotation of the drive motor A one-way clutch is provided to rotate only in the driving direction of the driving motor and prevent reverse rotation. Accordingly, even when the reverse wind blows from the outside at the beginning of the driving, the cooling fan inside and outside the outdoor unit can be quickly rotated in the driving direction of the driving motor. .

Air conditioner, outdoor unit, motor, cooling fan, one-way clutch, reverse rotation prevention device

Description

Outdoor unit equipped with Device for Preventing reverse rotation of Motor Shaft}

1 is a view showing the configuration of an outdoor unit equipped with a conventional reverse rotation prevention device,

2a and 2b is a forward operation state of the reverse rotation prevention device of Figure 1,

3 is a reverse operation state diagram of the reverse rotation prevention device of FIG.

4 is a view showing an outdoor unit equipped with a rotation shaft reverse rotation prevention device of the motor of the present invention,

5 is an enlarged cross-sectional view showing a state in which the motor and the reverse rotation prevention device of FIG. 4 are coupled;

Figure 6a is a forward operating state of the reverse rotation prevention device of Figures 4 to 5,

6B is a reverse operation state diagram of the reverse rotation prevention device of FIGS. 4 to 5.

<Explanation of symbols for the main parts of the drawings>

400: compressor 401: condenser

402: cooling fan 403: drive motor

404: rotating shaft 405: one-way clutch

406: housing

The present invention relates to an outdoor unit of an air conditioner, and more particularly, by preventing the cooling fan of the outdoor unit from rotating in reverse, so that the cooling fan is quickly moved in the driving direction of the drive motor at an early stage of driving of the outdoor unit. The present invention relates to an outdoor unit provided with a rotating shaft reverse rotation prevention device of a motor that can rotate.

In general, an air conditioner compresses a gaseous refrigerant at a high temperature / high pressure with a compressor, cools the compressed gaseous refrigerant at a high temperature / high pressure in a condenser, and then cools the cooled refrigerant to a low temperature / low pressure in a predetermined expansion valve. The process of changing and vaporizing the evaporator takes the heat around the evaporator and lowers the temperature of the surrounding air.

Such an air conditioner is an integrated air conditioner installed in a window or the like by integrating cooling and heat dissipation functions according to the configuration of a unit, and an indoor unit including an evaporator is installed in one space, and an outdoor unit including a compressor and a condenser is installed in the other space. It can be distinguished into a separate air conditioner.

Here, looking at the split type air conditioner in more detail, when the evaporator included in the indoor unit lowers the temperature of the ambient air by the heat of evaporation of the refrigerant, the temperature around one side of the indoor unit is lowered than the surroundings. In addition, the compressor and the condenser of the outdoor unit are cooled after changing the gaseous refrigerant, which has passed through the evaporator of the indoor unit, to a high temperature / high pressure as described above. In order to increase the cooling efficiency of the refrigerant, a predetermined cooling fan and the cooling are provided on one side of the outdoor unit. A drive motor for rotating the fan is mounted, and the cooling fan is rotated by the drive motor to forcibly pass external relatively low temperature air to the condenser to cool the refrigerant.

However, in the configuration in which the outdoor unit is simply provided with only a driving motor and a cooling fan, when the reverse wind blows toward the cooling fan while the driving motor is not driven, the cooling fan rotates in a direction opposite to the driving direction of the driving motor. Therefore, it is difficult to quickly rotate the cooling fan in the driving direction of the driving motor in the early stage of driving of the air conditioner.

In addition, in the case of applying a BLDC motor (Brush DC motor), which has been increasingly used in Japan and the like as the drive motor, a permanent magnet is mounted on the rotor and a coil is wound on the stator. Due to the structural characteristics of the BLDC motor, if a reverse wind blows toward the cooling fan in a state in which the BLDC motor is not operated, the cooling fan is reversed due to the reverse wind, and the rotating shaft of the motor is reversed, thus being mounted on the rotor. The permanent magnet is rotated in reverse to generate reverse electromotive force in the coil wound on the stator, and an electric current generated by the generated reverse electromotive force is difficult to predict due to the generated reverse electromotive force, thereby causing an electric damage to the drive circuit of the BLDC motor. It was.

In addition, when a hybrid induction motor (HIM: hybrid induction motor) applied by the same applicant as the applicant of the present invention is applied as a drive motor, the hybrid induction motor is a motor of a type without a driving circuit. For this reason, the electrical characteristics of the drive circuit due to the unpredictable current generated during reverse rotation of the rotary shaft can be prevented due to the structural characteristics of the hybrid induction motor, which will be described later in the configuration of the invention. The problem that it is difficult to quickly rotate the cooling fan in the driving direction of the drive motor initially remains a problem to be solved.

In the outdoor unit to which the BLDC motor is applied, a technique for mounting the reverse rotation preventing device in the outdoor unit is disclosed in Japanese Patent Laid-Open No. 2002-235934 to solve the above problem, which will be briefly described with reference to FIG. 1. .

1 is a view showing the configuration of an outdoor unit for an air conditioner equipped with a conventional reverse rotation prevention device, as shown in this, the compressor 101 is a high-temperature / high pressure refrigerant in the gas state introduced from the indoor unit (not shown) And the condenser 102 cools the refrigerant at a high temperature / high pressure through the compressor 101, where the cooling fan 104 is rotated by the motor 103 to increase the cooling efficiency of the refrigerant. Then, the air sucked from the outside passes through the condenser 102 to increase the cooling efficiency of the refrigerant. In addition, the reverse rotation prevention device 105 allows the cooling fan 104 to rotate normally in the driving direction of the motor 103 in a state where the outdoor unit is normally operated. Prevent reverse rotation of 104). In addition, the above components are preferably installed and supported in the housing 100 to increase the cooling efficiency of the refrigerant.

Here, the reverse rotation prevention device 105 will be described in more detail with reference to FIGS. 2A, 2B and 3.

First, Figures 2a to 2b is a view showing a forward operating state of the reverse rotation prevention device of Figure 1, as shown in this, when the motor 103 is normally driven and the wind blows from the outdoor unit to the outside of the outdoor unit The cooling fan 104 in which the wind blowing out of the outdoor unit pressurizes the reverse rotation prevention device 105 to the outside of the outdoor unit, and the one side protrusion 201 of the reverse rotation prevention device 105 rotates by the wind pressure. The cooling fan 104 is free to rotate so that the cooling fan 104 is free from the rotation range of the cooling fan 104.

On the contrary, if reverse wind blows from the outside in a state where the motor 103 is not driven, as shown in FIG. 3, the reverse wind exerts pressure on the reverse rotation preventing device 105 in the outdoor unit inward direction. The other side protrusion 202 of the reverse rotation prevention device 105 is caught by the stopper 200 forming a part of the housing 100 by the wind pressure, and the one side protrusion 201 moves within the rotation range of the cooling fan 104. Done. As a result, the other side projection 202 is caught in the stopper 200 while the counterwind is blowing, thereby keeping the one side projection 201 continuously within the rotation range of the cooling fan 104, It is to prevent the reverse rotation of the cooling fan 104 during the reverse wind.

Here, the one side protrusion 201 has a length sufficient to stay within the rotation range of the cooling fan 104 during the reverse wind, and the other side protrusion 202 is enough to be caught by the stopper 200 during the reverse wind It is natural to have enough length.

However, in such a configuration, even when the motor 103 is driven, the cooling fan 104 cannot freely rotate when a backwind having a pressure larger than the wind pressure generated by the cooling fan 104 blows from the outside. In addition, due to the structure of the reverse rotation prevention device 105 protruding to the outside there was a problem such as not beautiful in appearance.

The present invention was developed to solve such a problem, and an object of the present invention is to rapidly rotate a cooling fan in the driving direction of a driving motor in the initial stage of driving of an air conditioner.

Another object of the present invention, when applying the BLDC motor as the drive motor, to prevent the electrical damage of the drive circuit due to the current generated by the power generation phenomenon due to the reverse rotation of the cooling fan.

For this purpose, the present invention, in the outdoor unit for an air conditioner for forced air to the outside condenser by rotating the cooling fan to the drive motor to increase the cooling efficiency of the compressed refrigerant after being introduced from the indoor unit,

The one-way clutch is provided on the rotation shaft of the drive motor so that the rotation shaft rotates only in the driving direction of the drive motor and prevents reverse rotation.

Hereinafter, with reference to the accompanying drawings will be described in detail the outdoor unit provided with a rotation shaft anti-rotation device of the motor of the present invention.

4 is a view showing the configuration of an outdoor unit equipped with a reverse rotation prevention device of the rotating shaft of the motor of the present invention, as shown in this, the refrigerant in a predetermined gas state introduced through a predetermined pipeline from the indoor unit compressor 400 ) Is compressed to high temperature / high pressure, the refrigerant compressed by the compressor 400 is cooled by the condenser 401, and the refrigerant is circulated through a method of transferring the cooled refrigerant back to the indoor unit through a predetermined pipeline. In order to increase the cooling efficiency of the refrigerant, the cooling fan 402 is mounted on the rotating shaft 404 of the driving motor 403 and rotated to allow external cool air to pass through the condenser 401. In the non-driven state, in order to prevent the cooling fan 402 from rotating in the reverse direction from the outside in the direction of the cooling fan 402, the drive motor 403 is rotated. The shaft 404 is provided with a one-way clutch 405 in a reverse rotation preventing device on.

Herein, the driving motor will be described first, and in the following description of the present invention, a case in which a hybrid induction motor (HIM) is used as the driving motor will be described and described, but other motors other than the hybrid induction motor will be described. For example, various types of motors, such as a brushless DC motor (BLDC Motor) and an induction motor, may also be used as driving motors.

 Next, the operation, configuration and coupling relationship of the driving motor 403 and the one-way clutch 405 which is a reverse rotation preventing device in the present invention will be described in more detail with reference to FIG. 5. A cross-sectional view showing a state in which the driving motor 403 and the one-way clutch 405 that is the reverse rotation prevention device are coupled. As an example, the one-way clutch 405 is provided on the rotation shaft thereof. The stator 500 is coupled to the inside of the housing 505, and a rotation shaft 404 for transmitting the rotational force of the driving motor 403 to the cooling fan 402 is located at the center of the motor housing 505. The induction rotor 502 coupled to the 404 and rotating in accordance with the change of the magnetic flux around the outside is installed such that its outer circumference faces the inner circumference of the stator 500, and the outer circumference of the induction rotor 502 and the stator 500. Free rotation in the space between the inner circumference of the A magnet (FRM: Free Rotating Magnet, 501) is installed to be spaced apart from the outer circumferential surface of the induction rotor 502 and the inner circumferential surface of the stator, respectively, by a predetermined distance, and the magnet supporting portion 503 for supporting the free rotating magnet 501. ) Is coupled to one side of the free rotating magnet 501, a predetermined bearing portion 504 is provided on the contact surface of the magnet support portion 503 and the rotary shaft 404 and the contact surface of the rotary shaft 404 and the housing 505 Is installed to allow the rotating shaft 404 to rotate freely. In addition, at least one portion of the rotation shaft 404 is installed such that the one-way clutch 405 is supported by the motor housing 505 as a reverse rotation prevention device for preventing reverse rotation of the rotation shaft 404.

Here, although only the one-way clutch 405 is supported on the motor housing 505 and provided on the rotation shaft 404 inside the motor housing 505, it is to be mounted anywhere on the rotation shaft 404. Can be. For example, it is also possible to mount the one-way clutch 405 on the rotation shaft 404 outside the housing 505 of the motor, and to allow the one-way clutch 405 to be supported by the outdoor unit housing 406.

Referring to FIGS. 6A and 6B, the operation of the outdoor unit provided with the rotation shaft reverse rotation prevention device of the motor of the present invention having the configuration described above, FIG. 6A is a forward operation state diagram of the reverse rotation prevention device. When applied to the drive motor 403, the stator 500 of the drive motor 403 forms a magnetic field, the free rotation magnet 501 is a magnetic field formed by the stator 500 of the attraction and repulsive force In principle, the induction rotor 502 is rotated by the change of the magnetic flux generated as the free rotation magnet 501 rotates at the same speed as the synchronous principle. As a result, the induction rotor ( The rotating shaft 404 coupled to the 502 is to rotate. In this case, the plurality of rollers 602 supported by the plurality of springs 601 of the one-way clutch 405 are recessed provided with sufficient space for the roller 602 to rotate freely by friction with the rotation shaft 404. The rotating shaft 404 is rotated freely by moving to the part 605, so that the cooling fan 402 coupled to one side of the rotating shaft 404 is rotated, and the cooling fan 402 is rotated. Relatively cold air is forced into the condenser 401 to cause the condenser 401 to cool the refrigerant in a high temperature / high pressure state.

Meanwhile, a case in which the outdoor unit is not driven because no power is supplied to the driving motor 403 is illustrated in FIG. 6B, which is a reverse operation state diagram of the reverse rotation preventing device. When the back wind is blown from the outside toward the cooling fan 402 in a state that is not driven, the roller contact of the plurality of rollers 602 of the one-way clutch 405 protrudes toward the center by friction with the rotation shaft 404. By moving to the fixing part 604, the plurality of rollers 602 are firmly sandwiched between the outer ring 603 and the rotating shaft 404, thereby preventing the rotating shaft 404 from rotating in the reverse direction. That is, as shown in FIG. 6B, when the reverse shaft blows from the outside and the rotation shaft 404 tries to rotate in the reverse direction, the plurality of rollers 602 also start to rotate in the reverse direction by friction with the rotation shaft 404. However, in this process, the roller 602 moves from the depression 605 with sufficient clearance toward the roller contact fixing 604 that is not, thereby forming the minimum inner diameter of the outer ring 603. In (), since the roller 602 having a diameter larger than the clearance is inserted between the roller contact fixing part 604 and the play of the rotating shaft 604 to press the rotating shaft 404, the rotating shaft 404 can no longer rotate and stop. do. In the reverse rotation, the roller contact fixing portion 604 is interposed between the inner surface of the outer ring and the outer surface of the rotating shaft, and the roller 602 continues to travel therebetween. Therefore, when the reverse wind blows from the outside, the rotating shaft 404 is prevented from rotating to prevent reverse rotation.

Therefore, the outdoor unit of the air conditioner provided with the reverse rotation prevention device of the present invention sucks the outside air at the same time and forcibly vents the sucked air to the condenser to increase the cooling efficiency of the refrigerant, and blows from the outside when not driven. Prevents the cooling fan from rotating in reverse by the coming wind.

As described above in detail, the outdoor unit of the air conditioner equipped with the reverse rotation prevention device of the present invention prevents the reverse rotation of the cooling fan, thereby rapidly rotating the outdoor unit cooling fan in the driving direction of the driving motor at the initial stage of driving, and driving the fan. In the case of using a BLDC motor as a motor, it is possible to prevent the occurrence of unpredictable current due to the principle of power generation, thereby preventing electrical damage of the motor driving circuit, and removing the protruding portion to the outside, thereby having a beautiful appearance.

Although the invention has been described in detail only with respect to the specific examples described, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims. That is, in this specification, only the configuration for supporting / coupling the one-way clutch to the housing of the driving motor is illustrated and described. However, the one-way clutch may be configured to be supported / coupled to the outdoor unit housing.

Claims (4)

In the outdoor unit for an air conditioner for forcibly venting the outside air to the condenser by rotating the cooling fan with a drive motor to increase the cooling efficiency of the refrigerant compressed after the indoor unit, The outdoor unit having a rotation shaft reverse rotation prevention device of the motor, characterized in that the rotary shaft is rotated only in the driving direction of the drive motor, the one-way clutch to prevent the reverse rotation on the rotation shaft of the drive motor. The method of claim 1, wherein the one-way clutch; Outdoor unit provided with a rotation shaft reverse rotation prevention device of the motor, characterized in that a plurality. The method of claim 1, wherein the one-way clutch; An outdoor unit having a rotation shaft reverse rotation preventing device of a motor, characterized in that located on a rotation shaft inside the drive motor housing. The method of claim 1, wherein the one-way clutch; An outdoor unit having a rotation shaft reverse rotation prevention device of a motor, characterized in that located on a rotation shaft outside the drive motor housing.

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