JPH0536208U - Cooling system - Google Patents

Abstract

(57) [Summary] [Objective] To provide a cooling device capable of reducing noise due to vibration and improving heat dissipation efficiency of a heat exchanger [Configuration] The cooling device 19 of the present invention includes a fan 25 and an air introduction A hollow rotary shaft 41 that has a port 47 formed in at least one side and that is rotated by the rotational driving force of the electric motor 27;
A blade main body 45 which is multi-staged on the hollow rotary shaft 41
A fan blade 57 formed on the surface of the blade main body 45, and air introduced from an air introduction port 47 formed on the outer periphery of the hollow rotary shaft 41 facing the inner end of the fan blade 57 into the fan. It is characterized in that it is composed of a groove 53 discharged toward the blade 57.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling device including a heat exchanger including a hollow tube through which a refrigerant passes and a fan that cools the heat exchanger.

[0002]

[Prior Art]

 FIG. 3 shows the cooling device 1 disclosed in Japanese Utility Model Laid-Open No. 1-145936. In FIG. 1, the cooling device 1 includes a casing 7 in which the air intake duct 3 and the air exhaust duct 5 are communicated with each other, a cylindrical condenser 9 arranged in the casing 7, and an inside of the condenser 9. A pair of centrifugal multi-blade fans 11 (so-called “sirocco fans”) in which a plurality of fan blades are formed, and a motor 13 which is arranged at an intermediate position between these multi-blade fans 11 and drives the multi-blade fan 11 to rotate. It consists of and. Further, the condenser 9 is provided with a refrigerant inlet 15 to which the refrigerant is supplied and a refrigerant outlet 17 from which the refrigerant is discharged.

In the cooling device 1, the refrigerant having undergone heat exchange in an air conditioner (not shown) flows into the condenser 9 through the refrigerant inlet port 15 and, after passing through the condenser 9, returns to the air conditioner (not shown) from the refrigerant outlet 17 again. Is discharged. At this time, the refrigerant passing through the condenser 9 is cooled by the air blown from the multiblade fan 11 rotating by the driving force of the motor 13 to the condenser 9. Air for blowing air from the multi-blade fan 11 is sucked into the casing 7 from the air suction duct 3 and discharged from the discharge duct 5 to the outside.

Further, the condenser 9 is formed in a cylindrical shape, and the pair of multi-blade fans 11 arranged inside the condenser 9 is also formed in a cylindrical shape, so that the cooling device 1 as a whole can be made compact. It is possible to reduce the space required for the cooling device even when it is installed in the engine room.

[0005]

However, if the condenser 9 is formed in a cylindrical shape to make it compact, the multi-blade fan 11 arranged inside the condenser 9 is also cylindrical and elongated. However, it is difficult to form a long multi-blade fan.

Further, even if the length of the multi-blade fan 11 is increased, the wind speed significantly decreases at the position of 15 to 20% of the fan blade total length on the air intake side of the fan blade, and the heat radiation of the capacitor 9 is reduced. Efficiency is reduced.

Further, if the length of the multi-blade fan 11 is increased, the rigidity of the multi-blade fan 11 is insufficient and the rotating shaft of the multi-blade fan 11 and the blades vibrate, which causes noise.

Therefore, in order to avoid making the multi-blade fan 11 longer, it is conceivable to dispose the motor 13 at the center of the condenser 9 as shown in FIG. 3, but in this case, the capacitor 9 is arranged. There is a part that is not exposed to the wind, and the heat dissipation performance is further reduced.

Further, the multi-blade fan 11 has a large swirl component, and the flow of air leaving the fan blade largely tilts with respect to the radial direction and interferes with the condenser 9 to increase resistance, resulting in deterioration of heat dissipation performance. There was a problem.

Therefore, an object of the present invention is to provide a cooling device capable of reducing noise due to vibration and improving heat radiation efficiency of a heat exchanger.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a fan, a hollow rotary shaft having an air inlet formed in at least one side thereof, which is rotated by a rotational driving force of an electric motor, and blades which are multi-staged on the hollow rotary shaft. The main body, the fan blade formed on the surface of the blade main body, and the air introduced from the air inlet formed on the outer periphery of the hollow rotary shaft facing the inner end of the fan blade are directed toward the fan blade. The feature is that it is composed of grooves that are discharged.

[0012]

[Action]

 According to the present invention, the air introduced from the air introduction port passes through the hollow rotary shaft, is discharged from the groove toward the fan blade of the blade main body, and flows along substantially the radial direction of the fan blade to generate heat. The air is blown toward the inside of the exchanger. As a result, the heat exchanger releases heat and the refrigerant exchanges heat.

In the fan of the present invention, since the air flows in the substantially radial direction of the fan blade, it does not interfere with the heat exchanger and increase the resistance, and the air is efficiently blown to the heat exchanger. Thereby, the amount of air blown toward the heat exchanger is increased, and the static pressure is improved.

Further, since the blade area is increased by providing the fan blades on the hollow rotary shaft in multiple stages, this also increases the air volume. Therefore, the heat dissipation efficiency of the heat exchanger can be improved.

Further, since the blade main body is provided in multiple stages on the hollow rotary shaft, the rigidity of the blade main body can be enhanced, and noise due to vibration can be reduced.

[0016]

【Example】

 Next, an embodiment of the cooling device according to the present invention will be described with reference to FIGS. A cooling device 19 is shown in FIG. In the figure, the cooling device 19 includes a cylindrical heat exchanger 23 supported by a pair of side plates 21, a fan 25 arranged inside the cylindrical heat exchanger 23, and a rotational drive of the fan 25. And an electric motor 27 for operating. In FIG. 1, the arrow A direction indicates the flow of air supplied from the air introduction duct 51, and the arrow B direction indicates the flow of air during heat exchange.

The heat exchanger 23 is arranged outside the one side plate 21a and is connected to the refrigerant inlet side annular tank 31 communicating with the refrigerant inlet pipe 29. The heat exchanger 23 is arranged outside the other side plate 21b and the refrigerant outlet side. The refrigerant outlet side annular tank 35, which communicates with the pipe 33, and the tube 37, which communicates the refrigerant inlet side annular tank 31 and the refrigerant outlet side annular tank 35, are sent from the refrigerant inlet pipe 29 to the refrigerant inlet annular tank 31. The generated refrigerant passes through the tube 37 and is sent to the refrigerant outlet side annular tank 35, and is blown by the fan 25 and cooled while being discharged from the refrigerant outlet pipe 33.

The fan 25 has one end connected to the drive shaft 27 a of the electric motor 27 and the other end rotatably supported by the bearing support 39 of the one side plate 21 a, and the hollow rotary shaft 41. It is composed of a plurality of blade main bodies 45 fixed in multiple stages by screws 43 of 41, and the hollow rotary shaft 41 is rotated by the rotational driving force of the electric motor 27 so that the blade main bodies 45 are rotated. ..

An air inlet 47 is formed on the other end of the hollow rotary shaft 41. From this air introduction port 47, the air supplied by the air introduction duct 51 connected to the outer mounting portion 49 of the side plate 21 and sent into the inside of the tube 37 is introduced. In addition, a plurality of grooves 53 are formed on the outer circumference of the hollow rotary shaft 41. From this groove 53, the air introduced inside from the air introduction port 47 is discharged toward the surface of the blade main body 45. Further, a weir 55 that locally reduces the inner diameter of the hollow rotary shaft 41 is formed inside the hollow rotary shaft 41. The weir 55 restricts the flow of air introduced from the air introduction port 47 into the hollow rotary shaft 41 to the rear side.

As shown in FIG. 2, the vane body 45 has a plurality of spiral fan blades 57 protruding from a conical slope. The end of the fan blade 57 on the side of the hollow rotary shaft 41 faces the groove 53, and is formed so as to extend from the groove 53 toward the outer periphery while bending toward the opposite side with respect to the rotation direction. As a result, the air discharged from the groove 53 flows outward through the vicinity of the inclined surface of the blade body 45 (generally in the radial direction of the hollow rotary shaft 41).

The electric motor 27 is arranged outside the side plate 21b by the motor support portion 59, and the drive shaft 27a penetrates the side plate 21b. The electric motor 27 is driven by electric power supplied from a power source (not shown).

In order to perform heat exchange of the refrigerant by the cooling device 19, the refrigerant is sent from the refrigerant inlet pipe 29 to the refrigerant inlet side annular tank 31, passed through the tube 37, and then passed through the refrigerant outlet side annular tank 35. , Through the refrigerant outlet pipe 33 to an air conditioner (not shown).

When the refrigerant passes through the tube 37, the air blown by the fan 25 cools the refrigerant and exchanges heat. The fan 25 is rotated by rotationally driving the hollow rotary shaft 41 by the electric motor 27, and the air introduced into the hollow rotary shaft 41 from the air introduction port 47 is guided from the groove 53 along substantially the surface of the blade main body 45. The air is blown toward the outer circumference.

As shown in FIG. 2B, the outflow angle (angle with respect to the normal line direction of the blade body) of the air actually discharged from the blade body 45 is determined by the rotational direction M of the hollow rotary shaft 41 and the peripheral speed. When U is the outflow velocity V of the blade body 45, the combined outflow velocity W of the air outflow velocity V of the blade body 45 and the peripheral velocity U is an angle θ with respect to the normal direction.

As described above, according to the present embodiment, the air from the groove 53 flows in the substantially radial direction of the blade main body 45, so that the resistance of the tube 37 does not increase, and the tube 37 can efficiently move to the tube 37. Blown. As a result, the amount of air blown toward the tube 37 is increased and the static pressure is improved. Further, since the blade main body 45 is provided on the hollow rotary shaft 41 in multiple stages, the blade area increases, which also increases the air volume. Therefore, the heat dissipation efficiency of the tube 37 can be improved.

Further, since the blade main body 45 is provided in multiple stages on the hollow rotary shaft 41, the rigidity of the blade main body 45 can be enhanced, and noise due to vibration can be reduced.

Further, since the weir 55 is provided in the intermediate portion of the hollow rotary shaft 41, the amount of air sent to the blade body 45 on the air introducing port 47 side can be secured, and the air flow rate on the air introducing port 47 side can be secured. Can be secured.

Further, in this embodiment, since the electric motor 27 is arranged at one end of the hollow rotary shaft 41, there is no portion where the tube 37 is not exposed to the wind, and the heat dissipation performance of the tube 37 is reduced. There is nothing to do.

Further, since the blade area of the blade main body 45 can be increased, the air volume to the tube 37 is improved, and since the spiral fan blade 57 is formed in the blade main body 45, the fan efficiency is improved. , 10 ~ 15% better than traditional sirocco fan.

In the above embodiment, the air introduction port 47 is provided at one end of the hollow rotary shaft 41, but the air introduction port 47 is not limited to this and may be provided at the other end.

[0031]

[Effect of the device]

 As described above, according to the cooling device of the present invention, it is possible to obtain the excellent effects of reducing noise due to vibration and improving the heat radiation efficiency of the radiator.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a cooling device according to the present invention.

FIG. 2 is a cross-sectional view showing a fan taken along an axial direction and a cross-sectional view taken along a direction orthogonal to the axial direction.

FIG. 3 is a cross-sectional view showing a conventional cooling device.

4 is a cross-sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 19 Cooling device 23 Heat exchanger 25 Fan 27 Electric motor 37 Tube 41 Hollow rotating shaft 45 Blade body 47 Air inlet 53 Groove 57 Fan blade

Claims (1)

[Scope of utility model registration request] 1. A cooling device comprising a heat exchanger made of a hollow tube through which a refrigerant passes, and a fan for blowing air to the heat exchanger, wherein the fan has an air introduction port formed in at least one side. Along with the hollow rotary shaft that is rotated by the rotational driving force of the electric motor, the blade main body that is multi-staged on the hollow rotary shaft, the fan blade formed on the surface of the blade main body, and the inner end portion of the fan blade. A cooling device comprising: a groove formed opposite to each other on the outer circumference of the hollow rotary shaft and configured to discharge air introduced from an air inlet toward a fan blade.