JP6128490B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device in which a machine room is formed below a heat insulating box, and a compressor, a condenser, a condenser fan, and an electrical box are provided in the machine room.

  Conventionally, in a cooling device such as this kind of low-temperature showcase, a machine room is formed below the heat insulation box, and a compressor, a condenser, a condenser blower, etc. constituting the refrigerant circuit of the refrigeration apparatus are installed in the machine room doing. In addition, an electrical box containing a circuit board for controlling the compressor and the like is also provided in the machine room. Then, by operating the condenser blower, air is sucked from the outside, the condenser and the compressor are air-cooled, and the electrical box is also air-cooled to cool the internal heating elements (for example, Patent Documents) 1).

  By the way, in recent years, compressors that use an inverter to control the rotational speed have become mainstream. In that case, the size of the control circuit board is increased, the size of the electrical box that accommodates the circuit board is increased, and the amount of heat generated from the heat generating element is increased. In addition, a heat radiating fin (heat sink) is attached to the circuit board and the heat radiating fin is air-cooled to take heat from the heat generating element.

JP 7-280413 A JP 2011-208908 A

  In the cooling storehouse in which the machine room is configured on the upper side as in Patent Document 2, the size of the electrical box is not a problem. However, as in Patent Document 1, the machine room is configured on the lower side of the heat insulating box. In a low temperature showcase, etc., the height of the machine room cannot be secured. Therefore, in the arrangement of the circuit board in a standing state as in Patent Document 2, the height dimension of the electrical box is too large and installed in the machine room. Can not do.

  In addition, since the air that is ventilated to the heat radiating fins is also air that has passed through a condenser or a compressor, the temperature is relatively high, especially in a low-temperature showcase where the machine room is under the heat insulation box, etc. There was also a problem that the heating element could not be sufficiently air-cooled.

  The present invention has been made to solve the conventional technical problems, and smoothly cools the heating elements in the electrical box disposed in the machine room formed under the heat insulating box. It is an object of the present invention to provide a cooling device that can perform the above.

  In order to solve the above problems, a cooling device according to the present invention includes a compressor, a condenser, a condenser blower, and an electrical box provided in a machine room formed on the lower side of a heat insulating box. A circuit board disposed in a horizontal or substantially horizontal state in the box, a heat sink provided in a heat conduction relationship with the heat generating element below the heat generating element provided on the circuit board, and the heat sink An electrical box blower arranged on the lower side, an air discharge port formed in the base of the machine room corresponding to the electrical box blower, an air suction port formed in the base, and from this air suction port It is equipped with an air path to the air discharge port through the heat sink and the electrical box blower in sequence, and by operating the electrical box blower, the air below the base is sucked from the air suction port and passed around the heat sink in the wind path After the air outlet Characterized by discharging the base downwards.

  According to a second aspect of the present invention, there is provided a cooling device including a filter for removing dust in the air sucked from the air suction port in the above invention.

  According to a third aspect of the present invention, there is provided the cooling device according to the first aspect, wherein the filter is erected between the air inlet and the electrical box with a predetermined distance from the electrical box, and is substantially the same height as the height of the electrical box. It is characterized by having dimensions.

  According to a fourth aspect of the present invention, there is provided a cooling device provided on the base in the above invention, comprising a base member constituting a part of the air passage inside, an electric box mounted on the base member, and the electric box inside the base member A blower is installed, and the filter is held with a gap between the holding member and one side of the base member, which is provided over the edge excluding the lower edge of one side of the electrical box. In addition, an opening is formed on one side of the base member.

  According to the present invention, in the machine room formed on the lower side of the heat insulation box, in the cooling device provided with the compressor, the condenser, the condenser blower, and the electrical box, the circuit board is horizontally placed in the electrical box, Alternatively, since the circuit board is arranged in a substantially horizontal state, even when the circuit board is enlarged due to the inverter of the compressor or the like, it can be arranged without any trouble in the machine room.

  Furthermore, a heat sink is provided below the heat generating element provided on the circuit board in a heat conduction relationship with the heat generating element, and an electric box blower is disposed below the heat sink, corresponding to the electric box blower. The air outlet is formed in the base of the machine room, the air passage from the air inlet formed in the base to the heat sink and the blower for the electrical box is sequentially formed, and the air path leading to the air outlet is configured. Since the air below the base is sucked from the air suction port and passed around the heat sink in the air passage, it is discharged from the air discharge port to the bottom of the base, so the compressor and condenser are not air-cooled air The heating element of the circuit board can be effectively cooled by the air separately sucked by the electric box blower through the heat sink.

  In particular, an electrical equipment box blower is arranged below the heat sink of the circuit board arranged horizontally or substantially horizontally, and an air discharge port is formed in the base of the machine room corresponding to the electrical equipment box blower. An air suction port is formed to suck air from below the base of the machine room, cool the heat sink, and then discharge to the bottom of the base. Therefore, the air flow in the air passage should be smooth. In addition, the heating element can be cooled without any trouble even when a wall or another device is installed in contact with the side surface of the cooling device.

  On the other hand, a lot of dust is contained in the air below the base. If a filter for removing dust in the air sucked from the air suction port is provided as in the invention of claim 2, the bottom of the base will be provided. Even when the air is sucked, it is possible to eliminate or suppress the inconvenience that the heat sink and the electrical box blower are clogged.

  In this case, the filter according to the invention of claim 3 is erected between the air inlet and the electrical box with a predetermined distance from the electrical box, and has a height dimension substantially equal to the height of the electrical box. By doing so, it is possible to prevent the filter itself from being clogged at an early stage.

  Further, at that time, as in the invention of claim 4, a base member constituting a part of the air passage is provided on the base, an electrical box is mounted on the base member, and an electrical box blower is disposed in the base member. And holding the filter with a gap between the holding member and one side of the base member provided over the edge excluding the lower edge of one side of the electrical box, and the base member, By forming an opening on one side, it is possible to realize both holding of the filter and formation of the air passage with a relatively simple configuration.

It is a front view of the low temperature showcase as an Example of the cooling device of this invention. It is a side view of the low-temperature showcase of FIG. FIG. 3 is a perspective enlarged view of the X1 portion of the low temperature showcase of FIG. 2. FIG. 2 is a perspective enlarged view of a portion X2 of the low temperature showcase of FIG. It is a plane sectional view of the machine room part of the low-temperature showcase of FIG. It is the figure which removed the electrical equipment box of FIG. It is the figure which removed the air blower for electrical equipment boxes of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a front view of a low-temperature showcase 1 as an embodiment of the cooling device of the present invention, FIG. 2 is a side view of the low-temperature showcase 1, and FIG. 3 is a perspective enlarged view of a portion X 1 of the low-temperature showcase 1 in FIG. 4 is a perspective enlarged view of a portion X2 of the low temperature showcase 1 of FIG. 1, and FIGS. 5 to 7 are plan sectional views of a machine room portion of the low temperature showcase 1. FIG. 6 is a view in which the electrical box 16 is removed from FIG. 5, and FIG. 7 is a view in which the electrical box blower 31 is removed from FIG.

  In each figure, a low-temperature showcase 1 is used for displaying and storing products such as ice cream while being cooled (frozen) in a convenience store, for example, and is a horizontally-long rectangular heat insulating box 2 having an open upper surface. It is composed of A storage chamber 3 is configured in the heat insulating box 2, and the storage chamber 3 is set at a predetermined temperature (refrigeration temperature) by a cooler (not shown) and a cool air circulation blower that form a well-known refrigerant circuit of the refrigeration apparatus R described later. To be cooled.

  Side plates 4 and 4 made of a transparent plate material (transparent acrylic resin plate) are erected on both sides of the opening of the heat insulating box 2. The side plates 4 and 4 have a substantially mountain shape in which the front side is inclined and the rear side is vertical, and a metal top plate 6 is attached between the upper ends of the side plates 4 and 4. A rear plate 7 is attached between the rear edge of the top plate 6 and the opening rear edge of the heat insulation box 2, and a transparent plate material (between the front edge of the top plate 6 and the opening front edge of the heat insulation box 2 is provided. Sliding door type doors 8 (four sheets) made of a transparent glass plate are fitted.

  The door 8 is slidably fitted to a rail formed on the opening front edge of the top plate 6 and the heat insulating box 2, and the storage chamber 3 can be opened and closed by moving the door 8 in the left-right direction. It is possible to deliver internal products. Further, an illuminating lamp (fluorescent lamp or the like) 10 for illuminating the interior of the storage chamber 3 is attached below the top plate 6.

  On the other hand, a machine room 11 is formed below the heat insulating box 2. The bottom surface of the machine room 11 is composed of base angles 12A and 12B on both sides and a base 12 consisting of a unit base 12C extending between the front angles thereof, and the refrigerant circuit of the refrigeration apparatus R is placed on the unit base 12C. The compressor 15, the condenser 13, and the condenser blower 14 (two units) are provided, and an electrical box 16 is provided on the base angle 12 </ b> A on the left side, and is located in the machine room 11.

  In this case, the bottom surface of the heat insulating box 2 has a low rear side (indicated by the low-order part 2A in FIGS. 5 to 7) and a high front side (also in the high-order part 2B) in order to arrange the cooler and the air circulation fan. The condenser 13 is arranged on the right side in the machine room 11 below the high-order part 2B, the condenser fan 14 is attached to the rear side, and the compressor 15 is below the high-order part 2B. It arrange | positions at the left side (side of the condenser 13) toward the inside of the machine room 11 of the side.

  A machine room panel 21 closes the front surface of the machine room 11 so that it can be opened and closed. A plurality of slit-like air inlets 22 are formed in the part corresponding to the condenser 13 of the machine room panel 21, and a plurality of slit-like air outlets 23 are similarly formed in the part corresponding to the compressor 15. Has been. When the condenser blower 14 is operated, air (outside air) is sucked from the air suction port 22 as shown by broken line arrows in FIG. 5 of the machine room panel 21, passes through the condenser 13 and is air-cooled, and then the condenser blower 14 is sucked into.

  The sucked air is discharged rearward from the condenser blower 14 and collides with the rear surface of the lower portion 2A of the heat insulating box 2 so as to change the direction to the left and toward the compressor 15. After passing through the surroundings and air-cooled, the air is discharged from the air outlet 23 of the machine room panel 21. Thereby, the compressor 15 and the condenser 13 in the machine room 11 are air-cooled.

  On the other hand, the electrical box 16 is arranged on the left side (the side opposite to the condenser 13) further toward the compressor 15. Here, the rotation speed of the compressor 15 is controlled by an inverter, and a low-temperature showcase including a heating element 26 such as an inverter circuit for controlling the operation of the compressor 15 at a lower portion in the electrical box 16. One control circuit board 25 is horizontally arranged as shown in FIG.

  In this case, a heat sink 42 is attached to the lower side of the heating element 26 of the circuit board 25 via a heat transfer material 41 as shown in FIG. The heat sink 42 has heat radiating fins. The lower surface of the electrical box 16 is positioned higher than the surrounding surface, but a through hole is formed in the lower surface, and the heat sink 42 protrudes downward from the through hole. The through hole is closed.

  Further, a base member 43 opened on the lower surface is attached on the base angle 12 </ b> A, and the electrical equipment box 16 is attached on the base member 43, and the lower part of the heat sink 42 faces the base member 43. A slit-like air discharge port 29 (an electrical box air discharge port) as shown in FIG. 7 is formed in the base angle 12 A at a position corresponding to the lower side of the heat sink 42, and corresponds to the air discharge port 29. On the base angle 12 </ b> A, the electrical box blowers 31 (two units) are mounted on the lower side of the heat sink 42, and are located in the base member 43. That is, the air outlet 29 corresponds to the electrical box blower 31.

  In addition, a plurality of slit-like air outlets 27 are formed in the middle of the left side wall 16A in the height direction (a position away from the base angle 12A) as shown in FIG. The interior of the electrical box 16 is isolated and blocked from the outside except for the air outlet 27. Further, the base member 43 slightly protrudes to the left side (one side) toward the electrical equipment box 16, and the upper side edge of the electrical equipment box 16 on the left side face (one side face) of the base member 43 and above it. The dust removing filter 28 is detachably held from the front and is positioned between the substantially gate-shaped holding members 44 protruding leftward across the front and rear edges (the edges excluding the lower edge).

  With such a configuration, the filter 28 has a height obtained by combining the heights of the base member 43 and the electrical box 16 from the base angle 12A, that is, approximately the same height as the electrical box 16 attached to the base member 43. The side wall 16 </ b> A of the electrical box 16 is erected at a predetermined interval, and the periphery of this interval is closed by a restraining member 44 and a base member 43.

  A plurality of rectangular air inlets 32 (electrical box air inlets) are formed in the base angle 12A at a position corresponding to the outside (left side) of the filter 28. Therefore, the filter 28 is located between the air inlet 32 and the electrical box 16. In addition, an opening 46 is formed in the left corner (one side corner) of the base member 43, so that the filter 28 and the electrical box 16 are connected to each other from the air suction port 32 through substantially the entire filter 28. A series of air passages 47 that pass through the opening 46, pass through the inside of the base member 43, pass through the periphery of the heat sink 42, the electric box blower 31, and the air outlet 29 are formed.

  In other words, the upstream portion (part) of the air passage 47 is formed at a distance between the filter 28 and the electrical equipment box 16, and the downstream portion (part) thereof is formed in the base member 43. In each figure, 34 is a caster attached to the four corners of the machine room 11, and a gap is formed between the base 12 and the floor surface by the height of the caster 34.

  When the electrical box blower 31 is operated with the above configuration, air (external air) between the base angle 12A below the base angle 12A and the floor surface from the air suction port 32 of the base angle 12A as shown by an arrow in FIG. ) Is sucked into the machine room 11. The sucked air passes through the filter 28 and enters the interval (air passage 47) between the filter 28 and the side wall 16A of the electrical box 16. At this time, since air passes through the filter 28, dust in the air is captured by the filter 28 and removed. Further, since the air passes through the entire filter 28 having a size corresponding to the height of the base member 43 and the electrical equipment box 16, the filter 28 is not easily clogged.

  The air that enters the space between the filter 28 and the side wall 16A of the electrical box 16 enters the air passage 47 in the base member 43 through the opening 46 formed at the left edge of the base member 43, and around the heat sink 42. After passing and air-cooling it, it is sucked into the blower 31 for electrical box. Thereafter, the sucked air is discharged downward from the electrical box blower 31 and is discharged from the air outlet 29 located below the electrical box blower 31 to the floor surface below the base angle 12A. .

  Thus, the electrical box 16 is disposed in the machine room 11 where the distance between the base 12 (base angle 12A, etc.) and the heat insulation box 2 is small and the height cannot be secured, and the circuit board 25 is placed in the electrical box 16. Even when arranged in a horizontal state, the heat from the heating element 26 of the circuit board 25 is transmitted to the heat sink 42 through the heat transfer material 41, and is released into the air passing through the surroundings. The heating element 26 of the circuit board 25 is smoothly cooled.

  In this case, as described above, the condenser 13 and the compressor 15 are air-cooled by the air separately sucked by the condenser blower 14, so that the heating element 26 of the circuit board 25 in the electrical box 16 is connected to the condenser blower. The air cooling by the electrical box blower 31 is different from the air flow by 14.

  That is, the air that cools the heating element 26 of the circuit board 25 in the electrical box 16 is not the air that has passed through the condenser 13 and has risen in temperature as in the prior art, and thus the heating element 26 of the circuit board 25 in the electrical box 16. Is effectively cooled, and the risk of damage due to overheating is extremely low.

  The air near the floor surface below the base angle 12A contains a lot of dust, but the dust in the air introduced into the air passage 47 for cooling the heat generating element 26 via the heat sink 42 is filtered by the filter 28. Therefore, the heat sink 42 and the electrical box blower 31 are contaminated with dust, and the problem of clogging is eliminated. The relatively high temperature air in the electrical box 16 flows out of the air outlet 27 and is sucked into the blower 31 for electrical box.

  Further, air for cooling the heating element 26 of the circuit board 25 in the electrical box 16 is sucked from below by an air suction port 32 formed in the base angle 12A, and is lowered by an air discharge port 29 similarly formed in the base angle 12A. This eliminates the need to form an air inlet or the like on the side surface of the heat insulation box 2 and so on. Does not occur.

  As described above in detail, in the present invention, the low temperature showcase 1 in which the compressor 15, the condenser 13, the condenser blower 14, and the electrical box 16 are provided in the machine room 11 formed below the heat insulating box 2. In the (cooling device), since the circuit board 25 is horizontally arranged in the electrical box 16, even when the circuit board 25 is enlarged due to the inverter of the compressor 15 or the like, It can be arranged without any trouble.

  Further, a heat sink 42 is provided below the heat generating element 26 provided on the circuit board 25 in a heat conduction relationship with the heat generating element 26, and an electric box blower 31 is disposed below the heat sink 42. An air discharge port 29 is formed in the base angle 12A of the machine room 11 corresponding to the box blower 31, and the air discharge port 32 is sequentially formed from the air suction port 32 formed in the base angle 12A through the heat sink 42 and the electrical box blower 31. 29, the air under the base angle 12 </ b> A is sucked from the air inlet 32 by the operation of the blower 31 for the electrical box, and after passing around the heat sink 42 in the air path 47, Since the discharge is made from the discharge port 29 to the lower side of the base angle 12A, the compressor 15 and the condenser 14 are not air-cooled air, but by the electrical box blower 31. Through the heat sink 42 by the air which is separately sucked, it is possible to effectively cool the heat generating element 26 of the circuit board 25.

  In particular, an electric box blower 31 is arranged below the heat sink 42 of the circuit board 25 arranged in a horizontal state, and an air discharge port 29 is formed in the base angle 12A of the machine room 11 corresponding to the electric box blower 31. Furthermore, since the air suction port 32 is formed in the base angle 12A, air is sucked from the lower side of the base angle 12A of the machine room 11, and the heat sink 42 is air-cooled and then discharged to the lower side of the base angle 12A. The air flow in the air passage 47 can be made smooth, and the heating element 26 can be cooled without trouble even when a wall or other equipment is installed in contact with the side surface of the low temperature showcase 1. It becomes possible.

  On the other hand, the air below the base angle 12A contains a lot of dust, but since the filter 28 for removing dust in the air sucked from the air suction port 32 is provided, the base angle 12A below Even when the air is sucked, the inconvenience of clogging the heat sink 42 and the electrical box blower 31 can be eliminated or suppressed.

  In this case, the filter 28 is erected between the air suction port 32 and the electrical equipment box 16 with a predetermined distance from the electrical equipment box 16 so that the height of the filter 28 is substantially the same as the height of the electrical equipment box 16. Therefore, it is possible to prevent the filter 28 itself from being clogged at an early stage.

  Further, a base member 43 constituting a part of the air passage 47 is provided on the base angle 12 </ b> A, the electrical box 16 is attached on the base member 43, and the electrical box blower 31 is disposed in the base member 43. In addition, there is an interval between the holding member 44 provided over the edge except for the lower edge of one side (left side) of the electrical box 16 and the one side (left side) of the base member 43. The filter 28 is held, and the opening 46 is formed on one side (left side) of the base member 43. Therefore, both the holding of the filter 28 and the formation of the air passage 47 can be realized with a relatively simple configuration. It becomes possible.

  In the embodiment, the circuit board 25 is disposed in a horizontal state. However, the present invention is not limited to this, and the present invention may be applied to a case where the circuit board 25 is disposed in a substantially horizontal state although it is slightly inclined without departing from the spirit of the present invention. Shall be included.

  Further, in the embodiments, the present invention has been described by taking up a low temperature showcase, but the present invention is not limited thereto, and an electrical equipment box containing a refrigeration apparatus including a compressor and a condenser and a control circuit for controlling them is provided in the machine room. The present invention is effective for various cooling devices.

R Refrigeration equipment 1 Low temperature showcase (cooling equipment)
DESCRIPTION OF SYMBOLS 2 Heat insulation box 3 Storage room 11 Machine room 12 Base 12A Base angle 13 Condenser 14 Condenser 14 Condenser blower 15 Compressor 16 Electrical box 22, 32 Air inlet 23, 29 Air outlet 25 Circuit board 26 Heating element 28 Filter 31 Electrical Box blower 41 Heat transfer material 42 Heat sink 43 Base member 44 Holding member 46 Opening 47 Air passage

Claims (4)

In the cooling chamber provided with a compressor, a condenser, a condenser fan, and an electrical box in the machine room formed on the lower side of the heat insulation box,
A circuit board disposed in a horizontal or substantially horizontal state in the electrical box; and
Under the heat generating element provided on the circuit board, a heat sink provided in a heat conductive relationship with the heat generating element,
An electrical box blower disposed below the heat sink;
An air outlet formed in the base of the machine room corresponding to the electrical box blower;
An air inlet formed in the base;
An air path from the air suction port to the air discharge port through the heat sink, the electrical box blower in turn,
By operating the blower for the electrical box, the air below the base is sucked from the air suction port, passed around the heat sink in the air passage, and then discharged from the air discharge port to the lower side of the base. A cooling device characterized.   The cooling apparatus according to claim 1, further comprising a filter for removing dust in the air sucked from the air suction port.   The filter is disposed between the air suction port and the electrical box with a predetermined distance from the electrical box, and has a height dimension substantially equal to the height of the electrical box. The cooling device according to 1. A base member provided on the base and constituting a part of the air passage inside;
The electrical equipment box is mounted on the base member, the electrical equipment box blower is disposed in the base member, and
On one side of the base member and the holding member provided over the edge excluding the lower edge on one side of the electrical equipment box, the filter is held with a space between the electrical equipment box,
The cooling device according to claim 3, wherein an opening is formed on one side of the base member.

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