JP4632838B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device having a blower for ventilating a heat exchanger of a refrigeration cycle.

  Conventionally, in a cooling device such as a showcase, a refrigeration cycle compressor or condenser (heat exchanger) is installed on the unit base that forms the bottom of the machine room, and the condenser is further provided on the unit base. A blower for ventilation (condenser blower) is installed (for example, see Patent Document 1). In this case, the blower is composed of a motor and a fan (fan blade) attached to the rotation shaft of the motor. The fan is attached to the bracket, and the bracket is fixed to the upper surface of the unit base. It was installed.

  FIG. 5 shows the structure of such a conventional cooling device. In this figure, 100 is a unit base, and 2 is a condenser as a heat exchanger of a refrigeration cycle disposed on the unit base 100. Reference numeral 3 denotes a blower, which includes a motor 4 and a fan 6 attached to the tip of a rotating shaft 5 of the motor 4. The motor 4 is fixed to a bracket 7, and the bracket 7 is fixed to the upper surface of the unit base 100. Reference numeral 101 denotes a fan casing disposed on the unit base 100 on the blower 3 side of the condenser 2, and the fan 6 is disposed in a true circular fan hole of the fan casing 101.

In this case, the bracket 7 stands upright from the unit base 100, and the motor 4 of the blower 3 is attached to the bracket 7 so that the rotation shaft 5 thereof is perpendicular to the bracket 7. Therefore, the rotary shaft 5 is in a horizontal state parallel to the unit base 1. On the other hand, the fan casing 101 is vertically mounted on the unit base 100, and thus the rotation shaft 5 of the blower 3 is oriented perpendicular to the fan casing 101.
Japanese Patent Laid-Open No. 9-145245

  Here, a play in the thrust direction (axial direction) is provided on the rotating shaft 5 of the motor 4 of the blower 3. Therefore, when the ventilation resistance of the condenser 2 and the torque balance between the fan 6 and the motor 4 are in a certain balance, the base end portion of the rotating shaft 5 opposite to the fan 6 collides with the bearing due to this play. As a result, there is a problem that the generated noise becomes intense.

  This can be solved by breaking the balance. On the other hand, in this type of cooling device, the ventilation resistance changes throughout the operation period due to the clogging of the condenser 2 and the aging of the motor. In such a case, it is difficult to completely prevent noise. However, if the balance is structurally broken, it is possible to cope with a case where the ventilation resistance changes as described above.

  For this purpose, there are methods such as changing the torque of the motor 4 or changing the balance with the motor 4 by changing the fan 6, but all of them increase the cost and the overall balance including the heat exchange capability. As a result, it is not preferable.

  The present invention has been made to solve the conventional technical problem, and provides a cooling device that prevents or suppresses noise generated from a blower for ventilating a heat exchanger with a simple structure. With the goal.

According to a first aspect of the present invention, there is provided a cooling device including a blower for passing air through a heat exchanger of a refrigeration cycle, wherein the blower is attached to a motor and a tip of a rotating shaft of the motor, and a predetermined fan. The unit is composed of a fan disposed in the casing , the heat exchanger and the fan casing are disposed on the unit base, and the blower is installed on the unit base via the bracket, and the bottom surface of the bracket is in contact with the unit. By forming a protrusion on the base that contacts the fan side of the bottom of the bracket, or a recess where the bottom of the bracket on the side opposite to the fan falls, the motor can be raised on the fan side of the rotating shaft. Thus, it is provided so as to be inclined at a predetermined angle with respect to a direction orthogonal to the fan casing .

According to a second aspect of the present invention , there is provided a cooling device comprising a blower for ventilating a heat exchanger of a refrigeration cycle, the blower being attached to a motor and a tip of a rotating shaft of the motor, and a predetermined fan The fan is arranged in the casing, the heat exchanger and the fan casing are arranged on the unit base, and the blower is installed on the unit base via the bracket, and the bottom surface of the bracket that abuts on the unit base. By forming a convex part on the fan side, or by denting the whole part on the opposite side of the fan on the bottom of the bracket, the motor should be oriented in the direction perpendicular to the fan casing in a manner that the fan side of the rotating shaft is raised. It is provided so as to be inclined at a predetermined angle.

A cooling device according to a third aspect of the present invention is characterized in that in each of the above inventions, the fan hole of the fan casing in which the fan is located has an elliptical shape or an elliptical shape that is long in the vertical direction.

According to the invention of claim 1, in the cooling device provided with a blower for ventilating the heat exchanger of the refrigeration cycle, the blower comprises a motor and a fan attached to the tip of the rotating shaft of the motor, The fan is disposed in a predetermined fan casing, and the motor is provided such that the rotation axis thereof is inclined at a predetermined angle with respect to a direction orthogonal to the fan casing. The balance between the ventilation resistance of the heat exchanger and the fan and motor torque can be lost. Thereby, the noise generated from the blower can be reduced.

In addition, since the fan side of the motor rotation shaft is arranged to be higher, the end of the motor rotation shaft on the side opposite to the fan is always operated in contact with the bearing due to this inclination. Become. As a result, it is possible to prevent noise generated when the end of the rotating shaft opposite to the fan collides with the bearing.

In this case, the heat exchanger and the fan casing are arranged on the unit base, and the blower is installed on the unit base via the bracket, and the fan base on the bottom surface of the bracket is placed on the unit base where the bottom surface of the bracket contacts. Since the convex part that abuts the part or the concave part where the bracket bottom of the part on the opposite side of the fan falls, the rotating shaft is inclined with respect to the direction perpendicular to the fan casing with a very simple structure Is possible. In particular, in this case, since there is no need to process a bracket in particular, versatility is also increased.

According to the second aspect of the present invention, in the cooling device provided with a blower for ventilating the heat exchanger of the refrigeration cycle, the blower is composed of a motor and a fan attached to the tip of the rotating shaft of the motor. The fan is disposed in a predetermined fan casing, and the motor is provided such that the rotation axis thereof is inclined at a predetermined angle with respect to the direction orthogonal to the fan casing. In contrast, the balance between the ventilation resistance of the heat exchanger and the fan and motor torque can be disrupted. Thereby, the noise generated from the blower can be reduced.

Similarly, since the fan side of the rotating shaft of the motor is arranged to be higher, the end of the rotating shaft of the motor opposite to the fan is always in contact with the bearing due to this inclination. It will be. As a result, it is possible to prevent noise generated when the end of the rotating shaft opposite to the fan collides with the bearing.

In this case, the heat exchanger and the fan casing are disposed on the unit base, and the blower is installed on the unit base via the bracket, and a convex portion is provided on the fan side portion of the bottom surface of the bracket that contacts the unit base. Since the entire portion opposite to the fan on the bottom surface of the bracket is formed, the rotating shaft can be inclined with respect to the direction orthogonal to the fan casing with a very simple structure.

Further, by making the fan hole of the fan casing in which the fan is located as described in claim 3 an oval or ellipse that is long in the vertical direction, the fan casing is inclined with the inclination of the fan shaft and the rotating shaft. It is possible to satisfactorily surround the surroundings without touching. Thereby, deterioration of ventilation performance can also be prevented.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a side view of a cooling device 10 to which the present invention is applied. The cooling device 10 of the embodiment is installed in a machine room of a cooling storage such as a low-temperature showcase (not shown). In this figure, 1 is a unit base and 2 is an example of a heat exchanger of a refrigeration cycle. It is a condenser. Reference numeral 3 denotes a blower, which includes a motor 4 and a fan (blower blade attached perpendicularly to the rotation shaft 5) 6 attached to the tip of the rotation shaft 5 of the motor 4.

  The motor 4 is fixed to a bracket 7, and the bracket 7 is fixed to the upper surface of the unit base 1. Reference numeral 8 denotes a fan casing provided on the blower 3 side of the condenser 2, and the condenser 2 and the fan casing 8 are also disposed on the upper surface of the unit base 1. In this case, the condenser 2 and the fan casing 8 are installed in a direction orthogonal to the unit base 1, that is, in a vertical direction, and a fan hole 9 described later is formed in the fan casing 8. 6 is arranged.

  In this case, the motor 4 of the blower 3 is attached to the bracket 7 so that the rotation shaft 5 is in a direction orthogonal to the bracket 7. Further, as shown in FIG. 2, a convex portion 1A is formed on the upper surface of the unit base 1 at a position where the bottom surface of the bracket 7 abuts. The convex portion 1A is formed at a position that contacts the end of the bottom surface of the bracket 7 on the fan 6 side (fan casing 8 side), so that the bracket 7 is perpendicular to the unit base 1 in the vertical direction (horizontal direction). The fan 6 side is highly inclined at an angle θ with respect to the mounting direction) and is mounted on the unit base 1.

  Thus, since the bracket 7 is attached to the unit base 1 while being inclined, the rotation shaft 5 oriented in a direction orthogonal to the bracket 7 is also inclined with the fan 6 side being raised by an angle θ relative to the unit base 1. It will be. Further, the fan 6 is inclined with respect to the unit base 1 by an angle θ so that the rotary shaft 5 is inclined in this way so as to be parallel to the bracket 7.

  On the other hand, since the fan casing 8 is also mounted vertically on the unit base 1, the rotating shaft 5 is in a state where the fan 6 side is raised by an angle θ with respect to the direction orthogonal to the fan casing 8 (horizontal direction). Will be inclined. For this reason, the fan 6 is also inclined in the direction away from the fan casing 8 by an angle θ with respect to the fan casing 8. Therefore, the fan hole 9 of the fan casing 8 has an elliptical shape (or may be elliptical) in which the vertical dimension A is larger than the horizontal dimension B (long in the vertical direction) as shown in FIG. Thus, the fan 6 is surrounded by the fan hole 9 with a substantially uniform gap.

  With the above configuration, when the motor 4 of the blower 3 is operated, the rotary shaft 5 is rotated. Thereby, the fan 6 attached to it rotates and sucks air from the direction of the condenser 2. Thereby, the condenser 2 is ventilated as indicated by an arrow in FIG. 1 and air-cools the high-temperature refrigerant flowing inside.

  In this case, the rotating shaft 5 of the motor 4 has play in the thrust direction (axial direction), but as described above, the motor 4 is inclined at an angle θ with respect to the direction in which the rotating shaft 5 is orthogonal to the fan casing 8. Therefore, the fan 6 is inclined with respect to the fan casing 8, and the balance between the ventilation resistance of the condenser 2 where the noise becomes intense and the torque of the fan 6 and the motor 4 can be broken. Thereby, the balance which generate | occur | produces a noise between the base end of the rotating shaft 5 of the air blower 3 and a bearing can be destroyed, and it becomes possible to reduce a noise.

  In particular, since the rotating shaft 5 is inclined with respect to the unit base 1 (horizontal direction) so that the fan 6 side becomes higher as described above, the base end of the rotating shaft 5 opposite to the fan 6 is in contact with the bearing. It will be in a state as it is. Accordingly, the base end of the rotating shaft 5 is separated from the bearing by the rotation, and then approaches and collides with the bearing, and the noise generated by repeating it is effectively eliminated.

  In this case, if the inclination angle θ is too large, the performance for ventilating the condenser 2 will deteriorate. Therefore, θ is greater than 0 ° and in a range of 10 ° or less (0 ° <θ ≦ 10 °), preferably 4 ° or more and 6 ° or less (4 ° ≦ θ ≦ 6 °). In the embodiment, θ = 5. Experiments have confirmed that noise can be prevented without causing the deterioration of the ventilation resistance.

  Here, in the embodiment, the convex portion 1A is provided on the unit base 1 as shown in FIG. 2, but the present invention is not limited to this, and the concave portion where the bottom surface of the bracket 7 on the base end side opposite to the fan 6 of the rotating shaft 5 falls. Even if it is formed on the unit base 1, the same effect can be obtained. In particular, in this case, since it is not necessary to change the structure other than the unit base 1, versatility is increased and the performance of the blower 3 as a whole does not change.

  In addition to the structural change of the unit base 1, the structure on the bracket 7 side may be changed. In this case, for example, if a convex portion 7A projecting downward is formed at the end of the bottom surface of the bracket 7 on the fan 6 side as shown in FIG. Will do. On the contrary, the same effect can be obtained by denting the entire portion of the bottom surface of the bracket 7 opposite to the fan 6.

  Further, in each of the above embodiments, the bracket 7 is inclined with respect to the direction orthogonal to the unit base 1, but not limited thereto, the bracket 7 remains in the direction orthogonal to the unit base 1 (vertical direction), and the fan casing 8. May be inclined at a predetermined angle with respect to a direction (vertical direction) perpendicular to the unit base 1. In this way, the balance between the ventilation resistance of the condenser 2 and the torque of the fan 6 and the motor 4 that make noise intense with a simple structure is lost, and the noise of the blower 3 can be reduced.

  As described above, according to the present invention, it is possible to prevent noise generated when the base end of the rotating shaft 4 of the blower 3 opposite to the fan 6 collides with the bearing with a very simple structure. And since the fan hole 9 of the fan casing 8 is also made into an ellipse (or ellipse) long in the up-down direction, the fan casing 8 does not contact the fan 6 which inclines with the inclination of the rotating shaft 5, The surroundings can be satisfactorily surrounded. Thereby, deterioration of ventilation performance can also be prevented.

  In addition, although the condenser was taken up as an example of a heat exchanger in the Example, this invention is effective not only to it but the cooler of a cooling device.

It is a side view of the cooling device of the present invention. FIG. 2 is an enlarged side view of a bracket lower portion and a unit base of the cooling device of FIG. 1. It is a front view of the fan casing of FIG. It is an expansion side view of the bracket lower part and unit base of other examples of the present invention. It is a side view of the conventional cooling device.

1 Unit base 1A, 7A Convex part 2 Condenser (heat exchanger)
3 Blower 4 Motor 5 Rotating shaft 6 Fan 7 Bracket 8 Fan casing 9 Fan hole 10 Cooling device

Claims (3)

In the cooling device provided with a blower for ventilating the heat exchanger of the refrigeration cycle,
The blower is composed of a motor and a fan attached to the tip of the rotating shaft of the motor and disposed in a predetermined fan casing .
The heat exchanger and the fan casing are disposed on the unit base, and the blower is installed on the unit base via a bracket, and the bottom surface of the bracket is placed on the unit base at a position where the bottom surface of the bracket abuts. By forming a convex portion that abuts on the fan side portion of the fan, or a recess in which the bracket bottom surface of the portion opposite to the fan falls, the motor becomes higher on the fan side of the rotating shaft. A cooling device characterized by being provided so as to be inclined at a predetermined angle with respect to a direction orthogonal to the fan casing . In the cooling device provided with a blower for ventilating the heat exchanger of the refrigeration cycle,
The blower is composed of a motor and a fan attached to the tip of the rotating shaft of the motor and disposed in a predetermined fan casing.
The heat exchanger and the fan casing are disposed on the unit base, and the blower is installed on the unit base via a bracket, and protrudes from the fan side portion of the bottom surface of the bracket that contacts the unit base. Or by denting the entire portion of the bottom surface of the bracket opposite to the fan, so that the motor can be raised with respect to the direction perpendicular to the fan casing in a manner that the fan side of the rotating shaft is raised. And a cooling device provided to be inclined at a predetermined angle. The cooling device according to claim 1 or 2, wherein a fan hole of the fan casing in which the fan is located has an elliptical shape or an elliptical shape that is long in the vertical direction .

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