JP4952529B2 - Heating element storage box cooling device - Google Patents

Description

  The present invention is a box structure installed outdoors, and has a heating element such as an electronic component inside, which generates a large amount of heat and requires cooling even in winter, and the performance and life are greatly affected by temperature. In particular, the present invention relates to a cooling device and a noise reduction method thereof.

  In recent years, higher performance of electronic components and higher density of electronic components with respect to the control board have progressed, and the amount of heat generated from the control board has increased dramatically. Along with this, the temperature in the box tends to rise, and the operation guarantee and product life of the electronic components on the control board are greatly affected by the temperature in the box. For this reason, it is impossible to ensure reliability unless the temperature in the box is cooled below a certain level. On the other hand, with increasing installation of heating element storage boxes in urban areas and the like, it is desired to reduce the noise of equipment.

  2. Description of the Related Art Conventionally, a heating element housing box cooling device that cools this type of box by pneumatic heat exchange is known to be installed in the box (see, for example, Patent Document 1).

  Hereinafter, the configuration of the heating element storage box cooling device will be described with reference to FIGS. 14 and 15. As shown in FIG. 14, the heating element storage box cooling device 101 includes an internal air passage 107 that takes in and returns the air from the heating element storage box to the inside of the case 102, and an outdoor air passage that takes in outside air and discharges it to outside air. 108, an inside air blower 103 for conveying the air in the inside air air passage 107, an outside air blower 104 for carrying the air in the outside air air passage 108, and an intersection of the two air passages, a thin plate is bent in a corrugated shape, Are formed at equal intervals, and both end portions in the longitudinal direction are alternately connected by a bridging portion, and a plurality of alternately arranged inside air side rectangular channels 109 and outside air side rectangular channels 110 are arranged. The heat exchange element 105 for exchanging sensible heat between the outside air and the inside air, and the electronic components in the heating element storage box operate properly even when the heating element storage box is used at a low temperature in a cold region. Heat for heating the air in the air path And a coater 106.

Further, as shown in FIG. 15, the heating element storage box cooling device 101 is attached to the openable door 112 of the heating element storage box 111.
JP 2001-156478 A

  In such a conventional heating element storage box cooling device, since the outside air blower communicates with the outside air intake port, there is a possibility that noise emitted from the outside air blower, which is the main generation source, is directly emitted outside the machine.

  Moreover, although vibration is mentioned as one factor of noise generation, it may lead to generation | occurrence | production of a big vibration by the fixing method and the intensity | strength of a fixing member of an internal air blower and an external air blower.

  Also, if there is a decrease in the air volume or unevenness in the state of ventilation to the heat transfer plate, the rotational speed of the internal air blower or the external air blower must be increased to ensure cooling capacity, which may lead to increased noise. .

  The present invention solves such a conventional problem, and is provided with a silencer for suppressing noise, and also reduces vibration, increases air volume, and makes the ventilation state to the heat exchange element uniform. An object of the present invention is to provide a cooling device that suppresses noise.

  In order to achieve the above object, the heat exchanger of the present invention takes in the air from the heating element storage box and also circulates it back into the heating element storage box, and the outside air wind that takes in the outside air and discharges it to the outside air. The outside air blower that has a path and conveys air in the outside air path, the inside air blower that carries air in the inside air path, and the sensible heat of the outside air and the inside air are exchanged at the intersection of the outside air path and the inside air path. A bell mouth having a heat exchange element, a heater disposed between the inside air blower and the heat exchange element, and an opening having a diameter concentrically equal to or larger than the orifice of the outside air blower between the box outside air suction port and the outside air blower A member having a shape is communicated and provided as a silencer.

  Another means is that a cushioning material is disposed inside the sound deadening member.

  Another means is that a U-shaped notch is provided in the lower part of the muffling member to form a drainage hole communicating with the outside of the box.

  Another means is that the muffling member is joined to the notch portion provided in the element arrangement member for arranging the heat exchange element by the upper convex portion provided at the upper portion, and is attached to the bottom surface of the box body by the lower convex portion provided at the lower portion. It fits with the arranged mortar-shaped drain pan, and the annular projection provided around the front opening is fitted into the outside air suction opening of the box.

  The other means is characterized in that the inside air blower and the heater are fixed to the same plate and fixed as an integral part to a vertically adjacent surface which is not the same surface of the box by means of detachable means.

  Another means is characterized in that a space is provided between the integral part and the inner surface of the box.

  The other means is characterized in that a bowl-shaped member that is in contact with the upper surface of the heat exchange element is provided on the inner upper portion of the outside air outlet of the box.

  Moreover, the outside air blower attachment member which has the surface without the opening parallel to the main plate of a blade | wing is arrange | positioned by other means on the both right and left sides of an outside air blower.

  In addition, another means is provided with an outside air blower having an inducer that rotates with the blade at the blade inlet portion with the blade outlet facing backward in the rotation direction.

  Further, the other means is that the axial cross-sectional area from the inner diameter part of the blade or a point between the inner diameter part and the outer diameter side to the outer diameter part is not the same, and a large amount of air flows to the main plate side and the pressure is increased. In addition, a fan having a shape twisted toward the outer peripheral portion so that the main plate side outlet angle gradually decreases toward the side plate side outlet angle is provided.

  According to the present invention, a bell mouth-shaped member having an opening having a diameter that is concentric and equal to or larger than the orifice of the outside air blower is communicated between the box outside air suction port and the outside air blower, and is provided as a silencer. Further, it is possible to provide a heating element storage box cooling device that suppresses noise.

  In addition, it is possible to improve the cooling capacity and reduce the number of rotations of the fan by providing an outside air blower having an inducer that rotates with the blade at the blade entrance, with the blade outlet facing backward in the rotation direction. Further, it is possible to provide a heating element storage box cooling device that suppresses noise.

  Also, the cross section of the blade from the inner diameter part of the blade or the point between the inner diameter part and the outer diameter side to the outer diameter part is not the same in the axial direction, and the main plate side outlet is adapted to the state where a large amount of air flows and pressure is increased on the main plate side. By providing the fan having a shape twisted toward the outer peripheral portion so that the angle gradually decreases toward the side plate side outlet angle, it is possible to provide a heating element storage box cooling device that suppresses noise.

  Moreover, the heat generating body storage box cooling device which suppressed the noise can be provided by arrange | positioning the shock absorbing material to the silencer formed by making the orifice and the bell mouth-shaped member communicate from the box outside air suction port to the outside air blower.

  In addition, it has a U-shaped notch in the lower part and is joined with the orifice of the outside air blower to provide a silencer that forms a drain hole that leads to the outside of the box, so that water can be supplied from the silencer while maintaining the air volume. A heating element storage box cooling device having a function of draining can be provided.

  In addition, it can be joined to the notch provided in the member for arranging the heat exchange element, can be fitted with a mortar-shaped drain pan arranged on the bottom of the box at the bottom, and the projection arranged in a circle on the front By providing a silencer that can match the outside air suction opening of the box, it is possible to provide a heating element storage box cooling device that can easily position and fix the silencer and protect the inlet edge.

  Moreover, by fixing the inside air blower and the heater to the same plate and fixing them as removable parts to a vertically adjacent surface that is not the same surface of the box body, the heating element storage box that suppresses vibration and reduces noise A cooling device can be provided.

  In addition, by providing a space between the integrated part and the inner surface of the box, it is possible to provide a heating element storage box cooling device that suppresses noise.

  In addition, by providing an outside air blower mounting member with an opening that is parallel to the main plate of the blades on both the left and right sides of the outside air blower, the cooling capacity is improved by the rectifying action, and the rotation speed of the fan can be reduced. Thus, a heating element storage box cooling device that suppresses noise can be provided.

  The cooling device according to claim 1 of the present invention is configured such that a bell mouth-shaped member having an opening having a diameter that is concentric with and equal to or larger than the orifice of the outside air blower is communicated between the box outside air suction port and the outside air blower. Since the opening of the bell mouth shaped member is equal to or more than the opening of the orifice, the noise released from the outside air blower is reduced to the noise of the outside air blower and the bell mouth shape. Resonance can be silenced by communicating the member from the box outside air suction port to the outside air blower, and the outside air blower is arranged on the long air path side of the heat exchange element, resulting in higher pressure loss than the short air path side. It is possible to increase the amount of air blown to the long air passage side, make the air speed of the air flowing through each air passage of the heat exchange element closer to uniform, improve the cooling capacity, and reduce the rotation speed It has the effect that it can be.

  In addition, the cooling device according to the second aspect has a buffer material disposed inside the sound deadening member, and has an effect that the resonance noise reduction can be enhanced by the buffer material.

  In addition, the cooling device according to claim 3 is provided with a U-shaped notch in the lower part of the sound deadening member and formed a drainage hole leading to the outside of the box body, thereby maintaining the air volume of the outside air blower, and the sound deadening device of the outside air blower. It has the effect | action that the water which stayed in the silencer can be discharged | emitted outside through the drainage hole formed by joining an orifice.

  According to a fourth aspect of the present invention, in the cooling device of the fourth aspect, the muffler member is joined to the notch portion provided in the element arrangement member in which the heat exchange element is arranged by the upper convex portion provided in the upper portion, and the lower convex portion provided in the lower portion. Fits into a mortar-shaped drain pan located on the bottom of the box, and an annular projection provided around the front opening fits into the outside air suction opening of the box, allowing easy positioning and fixing In addition, the edge of the outside air suction opening of the box can be protected.

  Further, the cooling device according to claim 5 fixes the inside air blower and the heater to the same plate, and fixes the inside air blower by an detachable means on a vertically adjacent surface which is not the same surface of the box as an integral part. The axial vibration and horizontal vibration can be reduced, and the number of parts can be reduced because there is no need for the mounting plate for each main part, and the inner fan and heater can be maintained at the same time by attaching and detaching them as an integral part. Has the effect of being able to.

  In addition, the cooling device according to claim 6 has a space between the integral part and the inner surface of the box, so that it becomes a double wall surface, thereby improving the sound insulation effect and reducing the noise emitted from the inside air blower. It can be measured, and by routing the wiring of the heater and blower in the space, contact of the wiring to the heater that is a heat generating part and the blower that is an operating part can be avoided, and safety can be improved. Has an effect.

  In addition, the cooling device according to claim 7 is provided with a bowl-shaped member in contact with the upper surface of the heat exchange element on the inner upper part of the outside air outlet of the box, so that the vibration is reduced because the box is reinforced. And it has the effect | action that a heat exchange element can be fixed reliably by contacting a heat exchange element upper surface.

  Further, the cooling device according to claim 8 is an arrangement in which an outside air blower mounting member having an opening that is parallel to the main plate of the blades is arranged on both the left and right sides of the outside air blower, and the discharge air of the outside air blower is attached to the mounting member. Noise can be reduced by the rectifying action caused by flowing along the plane of the air, and the cooling capacity can be improved by the rectifying action, and the rotational speed of the fan can be reduced.

  The cooling device according to claim 9 is an apparatus in which an outside air blower having an inducer that rotates with the blade is disposed at the blade entrance portion with the blade outlet facing backward in the rotation direction. The air blowing action to the long air passage side where the pressure loss is higher than the short air passage side of the element can be enhanced, the air speed of the air flowing through each air passage of the heat exchange element can be made close to uniform, and the cooling capacity can be improved and the rotation speed Has the effect of lowering.

  In the cooling device according to claim 10, the axial cross-sectional area from the inner diameter portion of the blade or a point between the inner diameter portion and the outer diameter side to the outer diameter portion is not the same, and a large amount of air flows to the main plate side. By providing a fan having a shape twisted toward the outer peripheral portion so that the main plate side outlet angle gradually decreases toward the side plate side outlet angle according to the state to be performed, the air pressure raising action is performed without resistance to the air flow In addition, since the generation of turbulent vortices is reduced, the noise can be reduced without reducing the air volume.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, an inside air blower 2 is arranged in the upper part of the case 1 to take in air in the heating element storage box and return to the inside of the box to form an inside air air passage for circulating the inside air. In addition, an outside air blower 3 is arranged in the lower part of the case 1 to form an outside air passage that takes in outside air and discharges it to outside air. A heat exchange element 4 for exchanging sensible heat between the outside air and the inside air is provided at the intersection of the inside air passage and the outside air passage. The outside air blower 3 is attached with its suction port directed so as to suck air from the outside air suction port 5 provided in the case 1. Between the outside air inlet 5 and the outside air blower 3, there is provided a silencer member 7 having an opening concentric with the orifice 6 and having a diameter equal to or larger than the opening of the orifice 6. The sound deadening member 7 has a shape in which a cylindrical portion having a diameter equal to or larger than the diameter of the opening of the orifice 6 and an annular flat plate having an opening at the center are joined, and the flat plate side is arranged so as to be combined with the outside air inlet 5 of the case 1. The At the inlet portion of the outside air inlet 5, the muffling member 7 and the orifice 6 form a U-shaped space (a U-shaped space 41) (FIG. 3).

  According to such a configuration, the sound wave radiated from the outside air blower 3 and incident on the U-shaped space 41 formed by the silencer 7 and the orifice 6 is reflected from the wall surface of the U-shaped space 41. Noise reduction can be achieved by causing resonance mute.

  In addition, as shown in FIG. 2, a cushioning material 21 may be provided on the inner surface of the muffler member 7. As a material of the buffer material 21, urethane is used. According to this configuration, the noise reduction effect as a whole can be improved and the noise can be reduced by the sound absorption effect by the buffer material 21 and the resonance noise reduction effect of the U-shaped space 41. Further, the cushioning material may not be urethane.

  Further, as shown in FIG. 3, a U-shaped notch 22 is provided at the lower part of the muffling member 7. The U-shaped notch 22 is connected to a hole provided in a mortar-shaped drain pan 23 disposed on the bottom surface of the box at the bottom, and forms a drainage channel 24 that leads to the outside of the box. With this configuration, when the heating element storage box is installed outdoors and rainwater enters the silencer member 7 from the outside air suction port 5, it can be easily discharged out of the machine through the drainage channel 24.

  As shown in FIGS. 4 and 5, the muffler member 7 has an upper convex portion 42 for fixing the upper portion, a lower convex portion 43 for fixing the lower portion, and an annular portion that swells around the opening toward the outside air inlet 5. A protrusion 26 is provided. The upper convex part 42 fits into the notch part 28 provided in the element arrangement member 27 for arranging the heat exchange element. The lower convex part 43 fits into the concave part 29 provided in the mortar-shaped drain pan 23 arranged on the bottom surface of the box. The annular protrusion 26 can be fitted into the end of the outside air inlet 5. With such a configuration, the muffling member 7 can be easily positioned and fixed. Furthermore, since the annular protrusion 26 is installed so as to fit into the outside air inlet 5, the edge portion of the outside air inlet 5 is not directly exposed to rainwater, and thus can play a role of rust prevention.

(Embodiment 2)
6 is a schematic view of the blower 8 with an inducer, FIG. 7 is a schematic exploded view showing the heat exchange element 4, and FIG. 8 is a schematic sectional view of the installation of the blower 8 with an inducer.

  As shown in FIG. 6, the blower 8 with an inducer includes a side plate 10 having a bell mouth that is a suction port 9, a blade 11 and a main plate having an outlet angle of less than 90 degrees and an inducer 13 near the inlet. 12. The air sucked from the suction port 9 flows to the outer peripheral side along the blade 11, but by attaching the inducer 13, the inlet air is further attracted and boosted, and the air blowing action toward the main plate 12 side can be enhanced. In such a blower 8 with an inducer, a large amount of air is supplied to the main plate 12 side.

  As shown in FIG. 7, the heat exchange element 4 is formed by laminating a large number of heat transfer plates A14 and heat transfer plates B15 each having an L-shaped air passage formed by vacuum molding of a polystyrene sheet. An independent indoor air passage 16 and outdoor air passage 17 are formed by the laminated heat transfer plates, and are integrated by thermally welding the outer surfaces thereof. (In the figure, for simplicity, only four heat transfer plates are shown as exploded views.) In addition, the L-shaped air passages (the indoor side air passage 16 and the outdoor side air passage 17) are exhausted from the heat exchange element. The closer to the exit surface, the shorter the air path length, and the longer the air path length is, the longer the air path length becomes, so there is a difference in the pressure loss in each air path.

  As shown in FIG. 8, the blower with an inducer 8 is used for the inside air blower and the outside air blower, and the blower is arranged so as to be on the element discharge port side 19 of the heat exchange element to which the blower suction port 18 communicates.

  With such a configuration, the amount of air flow to the long air passage side 20 (the main plate 12 side of the blower) with higher pressure loss than the short air passage side of the heat exchange element is increased (arrow A in the figure), and each air passage of the heat exchange element It is possible to improve the cooling capacity by making the air velocity of the air flowing through the air closer to uniform, and as a result, the rotational speed of the blower can be reduced.

  Further, as shown in FIG. 9, the axial section is not the same from the inner diameter portion of the blade 11 of the inside air blower 2 and the outside air blower 3 or the point between the inner diameter portion and the outer diameter side to the outer diameter portion, and the main plate By providing a fan having a shape twisted toward the outer peripheral portion so that the main plate side outlet angle α sequentially decreases toward the side plate side outlet angle β in accordance with a state in which a large amount of air flows and is pressurized. Since the air pressure can be increased without resistance to the flow and the generation of turbulent vortices can be reduced, noise can be reduced.

(Embodiment 3)
As shown in FIG. 10, the fixed portions 30 arranged at both ends of the inside air blower 2 are connected by the fixing holes 32 arranged at the two U-shaped end portions of the integrally fixed component 31, and the inside air blower 2. A heater 34 having a square-shaped reinforcing member is formed on a non-identical adjacent surface of the box, that is, the side surface 33a and the inside air side wall surface 33b. By attaching, it is possible to reduce the axial vibration and horizontal vibration of the inside air blower 2 that are a cause of noise increase. Further, the number of parts can be reduced, and the inside air blower 2 and the heater 34 can be simultaneously maintained by attaching and detaching them as an integral part.

  As shown in FIG. 11, the integrally fixed component 31 has a hat-shaped (convex) cross section, and is arranged so as to have a double structure in which a space 35 is provided in parallel with the inner surface of the box. Thereby, when the noise from the inside air blower 2 is released from the back of the case, it is released through the double wall surface, so that the noise insulation effect of the noise can be enhanced. Further, by routing the wiring 36 between the heater and the blower in the space 35, it is possible to avoid the contact of the wiring with the heater that is the heat generating portion and the inside air blower 2 that is the operating portion, thereby improving safety.

(Embodiment 4)
As shown in FIG. 12, the heat exchange element is securely fixed by providing a flange-shaped reinforcing portion 38 on the panel fixing member 37 for positioning the heat exchange element disposed at the lower part of the inside air outlet and fixing the panel. In addition, since the area is large, the panel 39 that easily generates vibrations can be firmly fixed, and vibrations that contribute to noise generation can be reduced.

(Embodiment 5)
As shown in FIG. 13, an outside air blower mounting member 44 having a surface having no opening parallel to the main plate of the blades is arranged on both the left and right sides of the outside air blower 3. With this structure, the discharge air from the outside air blower 3 flows along the plane of the mounting member, and a rectifying action is generated to reduce noise.

  The present invention is a box structure that is installed outdoors such as a mobile telephone base station, a simple radio station, etc., and has a heating element such as a communication device inside, and since it generates a large amount of heat, cooling is required even in winter. It is useful for a cooling device for a heating element storage box having a precision device in which temperature, humidity, dust, rainwater, etc. affect performance and life.

Structure diagram of cooling device in Embodiment 1 of the present invention Installation schematic cross-sectional view of the silencer in the first embodiment Lower joint installation schematic sectional view of the silencer in the first embodiment Installation diagram of silencer in Embodiment 1 Assembly drawing of silencer in Embodiment 1 The perspective view of the fan with an inducer in Embodiment 2 Schematic exploded view showing the heat exchange element in the second embodiment Installation schematic sectional view of the blower with an inducer in the second embodiment Front view of centrifugal blower in embodiment 2 Fixed member installation drawing of inside air blower in Embodiment 3 Fixing member shape diagram of inside air blower in Embodiment 3 Arrangement of panel fixing members in embodiment 4 Arrangement diagram of outside air blower attachment member in embodiment 5 Structure of conventional heating element storage box cooling device Installation drawing of conventional heating element storage box cooling device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Inside air blower 3 Outside air blower 4 Heat exchange element 5 Outside air suction port 6 Orifice 7 Silencer member 8 Fan with inducer 9 Suction port 10 Side plate 11 Blade 12 Main plate 13 Inducer 14 Heat transfer plate A
15 Heat transfer plate B
DESCRIPTION OF SYMBOLS 16 Indoor side air path 17 Outdoor side air path 18 Blower suction port 19 Element discharge port side 20 Long air path side 21 Buffer material 22 U-shaped notch 23 Drain pan 24 Drainage channel 26 Annular projection 27 Element arrangement member 28 Notch 29 Recess DESCRIPTION OF SYMBOLS 30 Fixing part 31 Integrated fixing part 32 Fixing hole 33a Side surface 33b Inside air side wall surface 34 Heater 35 Space 36 Wiring 37 Panel fixing member 38 Reinforcement part 39 Panel 41 U-shaped space 42 Upper convex part 43 Lower convex part 44 Outside air blower attachment member α Main plate side exit angle β Side plate side exit angle

Claims (10)

An outside air blower having an inside air passage that takes in air from the heating element storage box and circulates back into the heating element storage box and an outside air passage that takes in outside air and exhausts it to outside air, and conveys the air in the outside air passage Between the outside air blower that conveys the air in the inside air air passage, the heat exchange element that is arranged at the intersection of the outside air air passage and the inside air air passage, and exchanges the sensible heat of the outside air and the inside air, and the outside air blower from the box outside air suction port And a bell mouth-shaped silencer member having an opening having a diameter that is concentric with and equal to or larger than the orifice of the outside air blower. The heating element storage box cooling device according to claim 1, wherein a cushioning material is disposed inside the silencing member. The heating element storage box cooling device according to claim 1 or 2, wherein a U-shaped notch is provided at a lower portion of the silencer member to form a drainage hole communicating with the outside of the box. The muffler member is joined to a notch portion provided in the element arrangement member for arranging the heat exchange element at the upper convex portion provided at the upper portion, and is a mortar shape arranged at the bottom surface of the box body at the lower convex portion provided at the lower portion The heating element storage box cooling device according to any one of claims 1 to 3, wherein an annular projection provided around the front opening is fitted into an outside air suction opening of the box. . The inside air blower and the heater are fixed to the same member, and fixed as a single part to a vertically adjacent surface that is not the same surface of the box by means of detachable means. Heating element storage box cooling device. 6. The heating element storage box cooling device according to claim 5, wherein a space is provided between the integrated part and the inner surface of the box. The heating element storage box cooling device according to any one of claims 1 to 6, wherein a bowl-shaped member is provided on the inner upper portion of the outside air outlet of the box so as to be in contact with the upper surface of the heat exchange element. The heating element storage box cooling device according to any one of claims 1 to 7, wherein an outside air blower mounting member having a surface having no opening parallel to the main plate of the blades is arranged on both left and right sides of the outside air blower. An outside air blower having an inside air passage that takes in air from the heating element storage box and circulates back into the heating element storage box and an outside air passage that takes in outside air and exhausts it to outside air, and conveys the air in the outside air passage A heating element storage box cooling device comprising: an inside air blower that conveys air in the inside air air passage; and a heat exchange element that is disposed at the intersection of the outside air air passage and the inside air air passage to exchange sensible heat between the outside air and the inside air. In either or both of the outside air blower and the inside air blower, a blower having an inducer that rotates backward with a blade at an outlet of the blade and rotates with the blade at a blade entrance portion, and the heat exchange element is 2. The heating element storage box cooling device according to claim 1, wherein each of the air path lengths has an L-shaped air path, and the long air path side of the heat exchange element is disposed on the main plate side of the blower. The cross-sectional area in the axial direction from the inner diameter part of the blade or the point between the inner diameter part and the outer diameter side to the outer diameter part is not the same, and the main plate side outlet angle is set in accordance with the state where a large amount of air flows and pressure is increased on the main plate side. The heating element storage box cooling device according to claim 9, further comprising a fan having a shape twisted toward an outer peripheral portion so as to gradually decrease toward a side plate side outlet angle.