JP2009192147A - Cooling unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling unit, keeping the temperature in an electric component chamber to a low temperature even if the interior temperature is high to continue the cooling operation by operating a cooling unit while cooling an inverter circuit in the electric component chamber. <P>SOLUTION: A compressor 7, a condenser 8 and an evaporator 11 are connected to one another to form a refrigerating cycle 6, the evaporator is housed in a cooling chamber 19 formed of heat insulating wall bodies 17, 18 and having a cooling fan 20, a blowoff air duct 30 for the cold air and a return air duct 28, and the compressor and the condenser are disposed in a machine room 5. The electric component chamber 35 housing electric components such as a circuit board 37 is disposed at the uppermost part of the body, and some of the cold air flowing through the blowoff air duct in the cooling chamber 19 is introduced into the electric component chamber. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a configuration of a cooling unit that cools an object to be cooled by supplying cold air.

  2. Description of the Related Art Conventionally, there is a cooling unit that is connected to a cabinet device such as a refrigerated storage that stores and refrigerates food and the like, and cools and keeps the inside of the cabinet at a predetermined temperature (for example, see Patent Document 1).

  On the other hand, the present applicants, in the case of taking a nap in a relatively small object to be cooled, for example, a vehicle such as a truck or a passenger car, is not refrigerated by a car air conditioner in which the engine is idling. The cycle is unitized and made compact, and these installation spaces are made as small as possible so that they are installed in the car with good installation stability, and the limited space is cooled by blowing cold air regardless of the external ambient temperature. Invented a cooling unit with high cooling performance that forms a comfortable sleeping environment, and has filed as Japanese Patent Application No. 2007-164893.

As shown in FIG. 7, the cooling unit (51) connects a compressor (57), a condenser (58), and an evaporator (61) to form a refrigeration cycle (56). 61) is housed in a cooling chamber (69) formed by a heat insulating wall (67), and a compressor (57) and a condenser (58) are disposed in the machine chamber (55), and the cooling chamber By placing (69) on the upper part of the machine room (55), the refrigeration cycle (56) was unitized and made compact, and the installation space was made as small as possible to improve installation stability. is there.
JP 2006-329554 A

  However, when the cooling unit (51) having the above-described configuration is installed and operated in a truck in summer, for example, the temperature inside the room in which the cooling unit (51) is installed is in a sealed vehicle. However, there is a possibility that the temperature becomes higher than 50 ° C., for example. In that case, the temperature in the electrical compartment (85) disposed at the top of the cooling unit (51) also becomes high, and the cooling capacity is insufficient only by the operation of the blower fan installed in the room. In this case, the DC-AC inverter circuit disposed in the circuit is overheated and broken.

  Therefore, when the in-vehicle temperature exceeds 50 ° C., the cooling unit (51) must be stopped to protect the DC-AC inverter from destruction. In order to maintain the operation of the cooling unit, It is necessary to install a separate inverter cooling device and control device, and there is a problem that the configuration is complicated and the cost is increased.

  The present invention has been made paying attention to the above points. By operating the cooling unit while cooling the inverter circuit in the electrical equipment room, the electrical equipment room temperature is kept at a low temperature even when the room temperature is high. An object of the present invention is to provide a cooling unit capable of continuing the cooling operation.

  In order to solve the above problems, a cooling unit according to the present invention includes a compressor, a condenser, and an evaporator connected to form a refrigeration cycle, and the evaporator is formed of a heat insulating wall, and a cooling fan and cold air blowing air. And a compressor and a condenser are disposed in the machine room, and an electrical room for housing electrical components such as a substrate is disposed at the top of the main body. A part of the cold air flowing through the air passage is introduced into the electrical equipment chamber.

  According to the present invention, since a part of the cold air flows into the electrical equipment chamber with the operation of the cooling unit, it is not necessary to stop the cooling unit even if the room is in a high temperature atmosphere, and a separate cooling means is provided. The inverter circuit can be effectively cooled and prevented from being destroyed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1 which is a cross-sectional view from the front of the cooling unit (1) and FIG. 2 which is a side cross-sectional view of FIG. 1, a horizontally long box-shaped outer shell is formed by a thin steel plate outer plate (2). It is formed and the central part in the height direction is divided into upper and lower spaces by a heat insulating partition wall (3).

  On the rigid bottom plate (4) that forms the bottom of the outer plate (2), a compressor (7) that compresses and discharges the refrigerant that forms part of the refrigeration cycle (6), and the discharged high-temperature and high-pressure A condenser (8) that receives the refrigerant to dissipate heat and condenses, and a heat dissipating fan (9) that cools high-temperature components such as these condensers (8) are installed to form a machine room (5).

  As shown in FIG. 3, the refrigeration cycle (6) is compressed by connecting the compressor (7), the condenser (8), the capillary (10) as a decompressor, and the evaporator (11) in an annular shape. The refrigerant is circulated by driving the machine (7) and evaporated by the evaporator (11) to generate cold air. As shown in FIG. 4 which is a transverse sectional view in the machine room (5), the weight The compressor (7), which is an object, is biased to one side in the width direction on the bottom plate (4) and fixed thereto via a vibration absorbing cushion body (12).

  A rectangular parallelepiped condenser (8) in which a meandering bent refrigerant pipe is fitted into a large number of fins to reduce the depth dimension is formed in a suction opening (13) formed on the front surface of the outer plate (2). A filter (14) is provided between the suction opening (13) and the condenser (8) to shield dust and the like.

  A heat dissipating fan (9) that is driven in synchronism with the operation of the compressor (7) is disposed in the casing (15) on the back surface of the condenser (8). The condenser (8) is cooled by suction from the inside, and the heat-exchanged air is discharged from the exhaust port (16) on the back of the outer plate (2) to the outside of the unit.

  At this time, as described above, since the compressor (7) is biased to the side portion in the machine room (5), the compressor (7) is not directly subjected to the cooling action by the heat radiating fan (9). In addition to preventing the evaporation temperature from decreasing, the heat dissipation fan (9) and the compressor (7) are arranged so that they do not overlap in the depth direction, thereby reducing the depth of the machine room (5). I am trying to make it.

  The space above the heat insulating partition wall (3) is a cooling chamber (19) provided with a heat insulating side wall (17) such as foamed polystyrene and an upper heat insulating wall (18) around the heat insulating partition wall (3). As shown in the cross-sectional view, in the substantially central portion, an evaporator (a part of the refrigeration cycle that receives the refrigerant from the condenser (8) and evaporates it to generate cold air). 11) is placed upright.

  Similarly to the condenser (8), the evaporator (11) has a rectangular parallelepiped with a reduced depth from a meandering bent refrigerant pipe and a large number of fins fitted to the refrigerant pipe. A cooling fan (20) and a casing (21) made of a sirocco fan whose diameter is narrower than the width dimension of the evaporator (11) are juxtaposed to the evaporator (11) on the plane part of the heat insulating partition wall (3). Standing up.

  The upper surface of the heat insulating partition wall (3) corresponding to the mounting portion of the evaporator (11) forms a flange portion (22) inclined downward toward one side, and is attached to the evaporator (11). A drainage port (23) is provided so as to collect the frost melting water to be led to the evaporating dish (24) provided at the upper part of the compressor (7) in the lower machine chamber (5).

  In the upper part of the side wall located slightly forward of the standing position of the evaporator (11) in the cooling chamber (19), the inside of the cold storage (25) arranged opposite to the object to be cooled, for example, the heat insulating side wall (17) Open the return port (27) of the cold air connected to the return duct (26) from the outlet, and go from the evaporator (11) to the casing (21) of the cooling fan (20) via the return air channel (28) I have to. Cold air is supplied from the casing (21) of the cooling fan (20) into the low-temperature storage (25) through a blowout air passage (30), a cold air blowout port (31), and a discharge duct (29) connected thereto. I'm trying to cool this.

  At this time, the cold air return port (27) and the cold air outlet port (31) are shifted to positions in which the axial centers of the heat insulating side wall (18) of the cooling chamber (19) do not coincide with each other in the vertical height direction and the depth direction. Accordingly, the two openings (27) and (31) can be disposed sufficiently apart from each other, and the depth dimension of the cooling unit (1) is reduced.

  The low-temperature storage (25) as the object to be cooled serves as a storage room for refrigerated food inside the heat insulation box, and opens or closes a door provided at the front opening to take out or store the indoor cold storage product. Although it is a storage for business use or home use that is stored and used, the object to be cooled is not limited to this, and the cooling unit and the object to be cooled cannot be integrated due to their form and installation space. It may be a cooling mat used on the floor, or a spot cooler intended to be used for air cooling of a small room or a part of the room. In consideration of the case where these objects to be cooled are used outdoors, the power source is not limited to the AC power source, and a battery may be used.

  Since the casing (21) is narrower than the evaporator (11), the lateral outer surface of the casing (21) in which the cooling fan (20) is arranged has a rectangular parallelepiped of the outer plate (2). The heat insulation wall (17) is recessed inward from the outer shape of the shape to form a recess (32). The pipe (33) from the evaporator (11) is led to this recess (32) A piping space connecting the compressor (7) from the machine room (5) and the extension pipe (34) from the condenser (8) is used. As described above, the pipes from both the cooling chamber (19) and the machine room (5) are connected by using the concave portion (32) as a piping space, so that a connection space is provided in the external space of the outer plate (2). There is no need to prevent expansion of the external dimensions of the cooling unit (1) itself.

  With the above configuration, when the compressor (7) in the cooling unit (1) is operated, the refrigerant from the condenser (8) evaporates in the evaporator (11) to generate cold air. Cooling fan (20) sends cooling object from cooling air outlet (31) to low temperature storage (25) and other objects to be cooled, and after circulating through storage room, cooling air return port (27) to cooling chamber (19) It is made to flow into an internal evaporator (11), and cool air circulation which cools and blows out again is performed.

  The upper part of the heat insulating wall (17) on the upper surface of the cooling chamber (19) is long and cylindrical in the width direction for accommodating the DC-AC inverter (36) in which the transformer (38) is arranged on the PC board (37). The electrical equipment chamber (35) formed in the above is disposed, and an operation panel (39) is disposed on the front surface thereof to control the operation of the cooling unit (1). Furthermore, when the cooling unit (1) is for in-vehicle use, etc., the DC-AC inverter (36) disposed in the electrical room (35) is overheated when the temperature is higher than 50 ° C., and the circuit is broken. For the purpose of protecting from destruction, a blower fan (40) is provided, and the inverter circuit is air-cooled by operating so that the vehicle interior temperature does not exceed 50 ° C.

  Thus, the cool air blowing passage (30) in the cooling chamber (19) and the electrical component chamber (35) are communicated by the communication pipe (41) so that air can be circulated. As shown in FIG. 6 which is an enlarged view of a corresponding portion, the communication pipe (41) is formed of a synthetic resin in the same manner as the blowout air passage (30), and is not connected to the blowout air passage (30). It is formed of a tube with a small area, one end of which is connected to the upper wall of the blowout air passage (30) and opened in the blowout air passage (30), and the other end is the bottom of the electrical compartment (35) It is connected to a wall and opened near the blower fan (40) inside.

  When the cooling unit (1) is operated, a part of the cold air flowing from the blowout air passage (30) in the cooling chamber (19) to the low-temperature storage (25) as the object to be cooled is connected to the communication pipe (41). The cold air that has been introduced into the electrical compartment (35) through the air and flows into the electrical compartment (35) is caused to flow backward in the electrical compartment (35) by the blower fan (40), and the DC-AC inverter (36) This is effectively cooled by passing through the portion and discharged outward from the vent (42) drilled in the back.

  The blower fan (40) may be an external fan as described above, or may be a fan built in the DC-AC inverter (36).

  At this time, the communication pipe (41) connected to the blowing air passage (30) side has its tip projecting into the air passage, and the tip shape is cut obliquely downward, and its opening faces the windward side. In this way, a part of the cold air blown from the cooling fan (20) to the low temperature storage (25) side can be taken into the communication pipe (41) and smoothly supplied to the electrical compartment (35). it can.

  In addition, the form of the communication pipe (41) is not limited to the above, but by forming a bent part or an engaging part to the connecting part along the air flow, Cold air can be taken in efficiently, and attachment to the bottom wall of the blowout air channel (30) and the electrical equipment room (35) can be facilitated.

  In addition, a damper (43) is provided in the communication pipe (41) to freely open or shield the communication path, and the room temperature around the cooling unit (1) is detected to reach a predetermined temperature, for example, 40 ° C. Then, the air passage is opened, and the air passage is controlled to be shielded at a predetermined temperature or lower, thereby preventing overheating of the DC-AC inverter (36) and protecting the inverter circuit, and the room temperature is lower than the predetermined temperature. In this case, since all of the cold air blown from the blowout air passage (30) can be supplied to the low temperature storage (25), the cooling can be effectively performed.

  With the above configuration, even if the room temperature where the cooling unit (1) is installed is in a high temperature state, a part of the cold air flows into the electrical room (35) as the cooling unit (1) is operated. Without providing a cooling means, the temperature inside the electrical compartment (35) can be maintained at a low temperature, the circuit of the DC-AC inverter (36) can be cooled to prevent destruction, and the room temperature is a high temperature, for example, near 60 ° C. Even if it becomes, since it is not necessary to stop a cooling unit (1), a cooling operation can be continued and a cooling target object can be cooled.

  In the above embodiment, the cooling chamber (19) is disposed above the machine chamber (5). However, the present invention is not limited to this, and the machine chamber (5) is disposed above the cooling chamber (19). In this case, the communication pipe (41) is a long body extending from the electrical equipment chamber (35) to the cooling chamber (19) through the machine room (5). In the case where the object to be cooled is placed near the floor, such as a cooling mat, since the cooling air outlet (31) is drawn out from the cooling chamber (19) at the lower part of the cooling unit (1). The connection configuration becomes easy and the heat loss is small, so that the efficiency of transmitting cool air can be improved.

It is sectional drawing from the front of the cooling unit which shows one Embodiment of this invention. It is a sectional side view of FIG. It is a schematic block diagram of the refrigerating cycle arrange | positioned in FIG. It is a cross-sectional view of the lower machine room part in FIG. It is a cross-sectional view of the upper cooling chamber part in FIG. It is an enlarged view of the communicating pipe part of FIG. It is sectional drawing from the front of the conventional cooling unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling unit 2 Outer plate 3 Heat insulation partition wall 4 Bottom plate 5 Machine room 6 Refrigeration cycle 7 Compressor 8 Condenser 9 Heat radiation fan
11 Evaporator 13 Suction opening 14 Filter
17 Insulated side wall 18 Upper insulated wall 19 Cooling chamber
20 Cooling fan 21 Casing 25 Low temperature storage
26 Return duct 27 Return port 28 Return air path
29 Discharge duct 30 Air outlet 31 Air outlet
35 Electrical room 36 DC-AC inverter 37 PC board
38 Transformer 39 Operation panel 40 Blower fan
41 Communication pipe 42 Ventilation hole 43 Damper

Claims (6)

  A compressor, a condenser, and an evaporator are connected to form a refrigeration cycle, and the evaporator is housed in a cooling chamber formed of a heat insulating wall body and having a cooling fan, a cool air blowing air passage, and a return air passage, and compressed. A machine and a condenser are placed in the machine room, and an electrical room that houses electrical components such as boards is placed at the top of the main unit, and a part of the cool air flowing through the blowout air passage in the cooling room is introduced into the electrical room. A cooling unit characterized by that.   The cooling chamber and the electrical equipment chamber are communicated by a communication pipe, one end of the communication pipe is connected to the upper wall of the blowout air passage and opened in the blowout air passage, and the other end is the bottom wall of the electrical equipment room in which the blower fan is installed The cooling unit according to claim 1, wherein the cooling unit is opened in the vicinity of the blower fan inside.   The cooling unit according to claim 1 or 2, wherein the cool air flowing into the electrical equipment chamber cools the inverter circuit unit and flows out from a vent formed on the opposite side of the inflow opening.   A damper for controlling ventilation is provided in the communication pipe, and the air passage is opened when the room temperature around the cooling unit exceeds a predetermined temperature, and the air passage is shielded when the temperature is lower than the predetermined temperature. 4. The cooling unit according to any one of 3.   The cooling unit according to any one of claims 1 to 4, wherein the cooling chamber is arranged in an upper part of the machine room.   The cooling unit according to any one of claims 1 to 4, wherein the cooling chamber is arranged in a lower part of the machine room.

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