JP2008157587A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a cooling effect of an electric component of an air conditioner when the outside air temperature is high. <P>SOLUTION: Outside air introduced from a suction air port 28 cools a compressor inside a machine chamber 26, and warmed outside air is discharged from a machine chamber discharge port 29. On the other hand, outside air introduced from a suction port 30 of an electric component box 24 provided near the suction port 28 flows into the electronic component box 24, cools the electric component 31 and is discharged from a discharge port 32 of the electric component box 24 to a blower chamber 23. Thereby, because the electric component 31 is cooled by outside air that is not heated by a high temperature component of the compressor in the machine chamber, the cooling effect can be maintained when the outside air temperature is high. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air conditioner having an electrical component that requires cooling, such as an inverter.

Conventionally, this type of outdoor unit of an air conditioner uses the negative pressure of a heat exchanger to cool an electrical component with outside air introduced from an intake port and exhausts it to the heat exchanger fan (for example, Patent Document 1). FIG. 3 shows an air conditioner described in the above document. In FIG. 3, the electrical component 10 is cooled by the outside air introduced from the machine room outside air intake 11 by the negative pressure due to the rotation of the heat exchanger blower, and exhausted from the vent 9.
JP 2003-105669 A

  However, in the conventional configuration, the intake port is provided below the machine room in order to prevent rainwater or the like from entering the electrical box disposed above the machine room. Therefore, the outside air that has passed through the air intake vent enters the electrical box after passing around the parts that are particularly hot at high outside temperatures, such as the compressor installed at the bottom of the machine room and the discharge pipe in the machine room. Sometimes the cooling effect of electrical components is reduced. Furthermore, there has been a problem that the temperature of the electrical equipment box rises due to heat transfer due to the temperature rise inside the machine room.

  Further, in the conventional configuration, when the heat exchanger blower is stopped and exhaust is not performed from the vent, rain water that has passed through the main body air outlet or the heat exchanger flows backward from the vent and the inside of the electrical box. It has a problem that it may cause a risk of electrical component failure or electric leakage.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an air conditioner outdoor unit that ensures cooling of electrical components and prevents intrusion of rainwater or the like into an electrical box.

  In order to solve the above-described conventional problems, an air conditioner according to the present invention includes a blower chamber containing a heat exchange blower and an outdoor unit formed by partitioning a machine room containing a compressor and an electrical box. An air inlet that introduces outside air into the machine room due to the negative pressure of the blower for the air, an electrical box exhaust outlet that cools the electrical components inside the electrical box from the air inlet and exhausts it to the fan room, and A machine room exhaust port for cooling the machine room and exhausting it to the blower room is provided.

  As a result, the outside air that is vented to the electrical box is not heated in the machine room, and the temperature rise of the machine room is reduced, so the object is to maintain the cooling effect of the electrical components even at a high outside temperature. .

  In addition, by providing an exhaust port door that opens and closes the electrical box exhaust port, intrusion of rainwater and the like is prevented by closing the exhaust port door when the electrical unit box is not exhausted.

Since the air conditioner of the present invention can vent the outside air to the electrical box without being heated in the machine room, the cooling effect of the electrical components can be obtained even in operation at a high outside temperature where the machine room temperature rises. Intrusion of rainwater or the like can be prevented by closing the exhaust port door when the electrical box is not exhausted.

  1st invention is the outdoor unit which partitioned off and formed the fan room which accommodated the fan for heat exchangers, and the machine room which accommodated the compressor and the electrical equipment box, The outside air was blown into the said machine room by the negative pressure of the said heat exchanger fan. An intake port to be introduced; an electrical box exhaust port that cools the electrical components inside the electrical box from the intake port and exhausts them to the blower chamber; and a mechanical chamber that cools the machine room from the intake port and exhausts it to the blower chamber By providing an exhaust port, the outside air can be ventilated to the electrical box without being heated in the machine room. Can be obtained.

  The second invention is characterized in that, in particular, a heat insulating material is attached to the surface of the electrical equipment box of the first invention, so that an increase in temperature of the electrical equipment box due to heat transfer from the machine room can be suppressed.

  In the third aspect of the invention, in particular, because the exhaust box door is provided at the electrical box exhaust port of the first aspect of the invention, during operation, the exhaust port door is opened and the cooling of the electrical components is ensured by the air introduced from the intake port. By closing the exhaust door when exhaust is not taking place, it prevents rainwater from entering the electrical box mixed with air that flows backward from the exhaust, leading to a dangerous state such as failure of electrical components or electrical leakage. can do.

  In the fourth invention, in particular, the exhaust door of the third invention is made of aluminum, so that the heat of the exhaust box door can be transferred to dissipate heat inside the electrical box, so that the exhaust door is closed. The temperature rise inside the electrical box can be reduced and the frequency of opening the exhaust door can be reduced, and rainwater can enter the electrical box mixed with the air that flows backward from the exhaust port, causing electrical component failures and electrical leakage. It is possible to prevent a dangerous state from being caused.

  In the fifth invention, in particular, the contact surface provided around the exhaust port of the exhaust port door of the third invention is inclined, and the exhaust port door is brought into contact with the contact surface by a vertical force due to gravity. The air blower operates and the negative pressure applied to the exhaust door becomes stronger than gravity, and the exhaust door opens to ensure cooling of the electrical components.When the heat exchanger blower stops, it closes by gravity and flows back to the air from the exhaust port. It is possible to prevent rainwater and the like from entering the electrical equipment box and causing dangerous conditions such as failure of electrical components and electric leakage.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a schematic sectional view from the front of an outdoor unit of an air conditioner according to the first embodiment of the present invention, and FIG. 2 is an enlarged view of the vicinity of the electrical box in FIG.

  In FIG. 1, the outdoor unit 21 is divided into a blower chamber 23 having a heat exchanger blower 22 and a machine room 26 having an electrical box 24 and a compressor 25.

The air exchanged by the rotation of the heat exchanger blower 22 is blown out from the blower outlet 27, and the blower chamber 23 becomes negative pressure, so that the outside air is introduced into the machine chamber 26 from the intake port 28, and the compressor 25 is cooled. Outside air is exhausted from the machine room exhaust port 29 to the blower room 23. On the other hand, the outside air introduced from the electrical box intake port 30 provided near the intake port 28 is ventilated into the electrical box 24 and enters the electrical box 24 to cool the electrical component 31 and from the electrical box exhaust port 32 to the blower chamber 23. Is exhausted. The exhaust door 33 is made of aluminum, has a horizontal shaft on the upper end surface of the door so that the exhaust port 32 can be opened and closed, is installed so as to be able to swing toward the blower chamber 23 side, and is provided around the exhaust port 31. The surface is inclined and is in contact with the contact surface by a vertical force due to gravity. The solid line in FIGS. 1 and 2 swings and the exhaust port 31 is open, and the broken line is closed.

  The heat insulating material 34 is attached to the surface of the electrical equipment box 24 and insulates heat transfer from the machine room 26 to the electrical equipment box 24.

  About the air conditioner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. First, when the outdoor unit 21 is stopped, the heat exchanger blower 22 and the compressor 25 are stopped. At this time, there is no air flow from the electrical box 24 to the blower chamber 23, and the exhaust port door 33 is pressed against and contacts the contact surface of the exhaust port 32 by gravity. Accordingly, the exhaust port 32 is in a closed state, and the wind and rain are strong, and even if air containing rainwater flows backward from the blower outlet 27 and enters the blower chamber 23, it does not enter the electrical box 24.

  Next, when the outdoor unit 21 is operated, the heat exchanger blower 22 rotates and the blower chamber 23 has a negative pressure, and the machine chamber 26 and the electrical box are in communication with the intake port 28, so that it is equal to the atmospheric pressure. Therefore, the exhaust port door 33 swings toward the blower chamber due to this pressure difference, and the exhaust port 32 opens. During operation, even if rainwater enters the blower chamber from the heat exchange side (not shown), the intrusion of rainwater into the electrical box 24 does not occur because the exhaust is exhausted from the electrical box 24 to the blower chamber side. The outside air introduced from the intake port 28 cools the compressor in the machine room 26, and the warm outside air is exhausted from the machine room exhaust port 29. Thereby, the temperature rise in the machine room is reduced.

  On the other hand, the outside air introduced from the electrical box intake port 30 provided near the intake port 28 is ventilated into the electrical box 24 and enters the electrical box 24 to cool the electrical component 31 and from the electrical box exhaust port 32 to the blower chamber 23. Is exhausted. Thereby, since an electrical component is cooled with the open air which is not heated with high temperature components, such as a compressor, in a machine room, the cooling effect in high external temperature is securable. Furthermore, the temperature rise in the machine room is reduced by ventilation, and heat insulation is attached to the surface of the electrical box that contacts the machine room, so the impact of the temperature rise in the machine room on the temperature rise of the electrical box is reduced. it can.

  As described above, in the present embodiment, since the outside air can be ventilated to the electrical equipment box without being heated in the machine room, the cooling effect of the electrical components is obtained even in the operation of the high outside air temperature in which the machine room temperature rises. It is possible to prevent deterioration of electrical components and improve the life and reliability.

  In addition, by closing the exhaust door when the exhaust is not being performed from the electrical box, it is possible to prevent the intrusion of rainwater, etc., and to prevent a dangerous state such as failure of electric parts or electric leakage. it can.

  As described above, since the air conditioner according to the present invention is provided with an exhaust port separately in the electrical box and the machine room, the machine room equipped with electrical components is likely to become hot at a high outside temperature. It can also be applied to applications.

Sectional schematic diagram of the outdoor unit of the air conditioner in Embodiment 1 of the present invention Enlarged view of the vicinity of the electrical box in FIG. Cross-sectional view of a conventional air conditioner outdoor unit

Explanation of symbols

22 Heat Exchanger 24 Electrical Box 25 Compressor 28 Air Intake Port 29 Machine Room Exhaust Port 31 Electrical Component 32 Electrical Unit Box Exhaust Port 33 Exhaust Port Door 34 Insulating Material

Claims (5)

A blower chamber containing a heat exchange fan, and an outdoor unit formed by partitioning a machine room containing a compressor and an electrical box, and an intake port for introducing outside air into the machine room by the negative pressure of the heat exchange fan; An electrical box exhaust port that cools the electrical components inside the electrical box from the intake port and exhausts it to the blower chamber, and a machine room exhaust port that cools the machine room from the intake port and exhausts it to the blower chamber Air conditioner characterized by that. 2. The air conditioner according to claim 1, wherein a heat insulating material is attached to the surface of the electrical equipment box. 2. The air conditioner according to claim 1, further comprising an exhaust door that opens and closes the electrical box exhaust. The air conditioner according to claim 3, wherein the exhaust door is made of aluminum. The air conditioner according to claim 3, wherein the contact surface provided around the electrical box exhaust port is inclined, and the exhaust port door is in contact with the contact surface by a vertical force due to gravity.