JP4016368B2 - Vehicle roof mounted air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner of a type in which a capacitor unit is mounted on the roof of a vehicle.
[0002]
[Prior art]
As an air conditioner mounted on a vehicle roof, a technique disclosed in Japanese Patent Application Laid-Open No. 61-257317 is known. As shown in FIG. 3, the condenser unit 1 of this air conditioner employs a structure (vertical arrangement) in which a plurality of condensers 4 are arranged in the vehicle traveling direction and external air is allowed to pass laterally. 4 is an electric circuit diagram of a main part for controlling the energization of the capacitor fan 5. When the cooler is activated and the capacitor relay switch 7 is turned on, the capacitor fan 5 is connected to the battery 8 and the capacitor fan 5 is activated. Is activated, and the outside air is passed through the condenser 4 in the lateral direction.
However, in recent years, for the purpose of thinning and cost reduction, a structure (horizontal arrangement) has been adopted in which the condenser 4 is integrated and horizontally arranged to allow outside air to pass from top to bottom (FIG. 1). reference).
[0003]
[Problems to be solved by the invention]
In the case of many horizontal capacitor arrangements in recent years, foreign objects such as fallen leaves that have fallen on the roof of the vehicle may block the suction port A of the condenser 4 while the vehicle is stopped or parked. When the cooler is started in this state, the fallen leaves and the like are sucked into the suction port A by the negative pressure of the fan, and thus a problem that the fallen leaves and the like are not blown away even when the vehicle travels occurs. As described above, when the fallen leaves or the like are sucked into the suction port A during the operation of the cooler and the suction port A is blocked, the capacity of the capacitor is deteriorated due to the decrease in the air volume, which may increase the high pressure. For this reason, in the case of horizontal arrangement of capacitors, there is a problem that a high-risk work is required to climb the rooftop of a vehicle using a ladder or the like and remove fallen leaves.
[0004]
OBJECT OF THE INVENTION
The present invention has been made in view of the above circumstances, and the purpose of the capacitor unit itself adopting a horizontal capacitor arrangement is to automatically blow off foreign matters such as fallen leaves of the capacitor suction port at the start-up, and the capacitor suction port An object of the present invention is to provide a roof-mounted air conditioner for vehicles that does not have a problem of being blocked.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, the roof-mounted air conditioner for vehicles is arranged horizontally only when the vehicle is stopped or parked by reversely rotating the condenser fan by the switching means only at the initial start-up time for a certain period of time after the start-up. Foreign matter such as fallen leaves that have fallen into the suction port of the condenser is blown off by the operation of the condenser fan. After a certain period of time , the condenser fan is rotated forward by the switching means, so that the outside air passes from the top to the bottom of the condenser, but the foreign matter at the suction port is blown away, so there is no reduction in the volume of the condenser wind. No problems such as reduced performance occur.
In addition, since foreign objects such as fallen leaves at the condenser suction port are blown off by reverse rotation of the fan at startup, climbing with a ladder or the like on the roof of the vehicle to eliminate or reduce work frequency with high risk of removing foreign substances such as fallen leaves Can do.
[0006]
By employing the second aspect, including lengthening the reverse rotation time easily occurs timing of deciduous, it can cope with timing and the environment used.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. 1 is a schematic cross-sectional view of the capacitor unit, and FIG. 2 is an electric circuit diagram of the main part of the control means.
The capacitor unit 1 shown in this embodiment is mounted on the roof of a bus vehicle, and a capacitor 4, a capacitor fan 5, etc. are arranged between upper and lower cases 2 and 3.
[0008]
The capacitor 4 is thin and is disposed in the horizontal direction at the center of the upper and lower cases 2 and 3 so that outside air passes in the vertical direction.
The condenser fan 5 is disposed on both sides of the condenser 4, and normally sucks outside air from the suction port A on the upper surface of the condenser 4 and discharges the outside air passing through the condenser 4 from the outlet B above the fan. Is provided.
[0009]
The condenser fan 5 is energized and controlled by the control means 6. The control means 6 operates the condenser fan 5 during the cooler operation, and is provided so as to drive the condenser fan 5 to rotate backward for a predetermined time (short time) at the initial stage of the cooler activation. FIG. 2 shows an electric circuit for driving the condenser fan 5 to rotate in the reverse direction.
This electric circuit includes a capacitor relay switch 7 that is turned on when the cooler is started, and a fan reverse relay switch 9 (corresponding to switching means) that reverses the positive / negative connection between the capacitor fan 5 and the battery 8. The reverse relay switch 9 is turned on for a predetermined time by a timer circuit (not shown) when the cooler is activated.
[0010]
The operation according to the present invention will be described. When the cooler is activated, the capacitor relay switch 7 is turned on, and the fan reverse relay switch 9 is turned on for a predetermined time. Thereby, the condenser fan 5 is reversely driven for a certain time only at the initial stage of the cooler activation.
When the condenser fan 5 is driven in reverse rotation, the outside air flows upward from the bottom of the condenser 4, and foreign matters such as fallen leaves that have fallen into the suction port A of the condenser 4 while the vehicle is stopped or parked are blown away.
[0011]
After a certain period of time has elapsed, the fan reverse relay switch 9 is turned off, and only the capacitor relay switch 7 is turned on. The condenser fan 5 rotates normally and allows outside air to pass from above to below the condenser 4. At this time, since the foreign matter in the suction port A is blown away, the air volume of the condenser 4 does not decrease, and the capacitor 4 does not cause a problem such as a decrease in capacity.
Moreover, in order to automatically blow off foreign matter such as fallen leaves of the suction port A when the cooler is started, climbing the top of the bus vehicle using a ladder or the like to eliminate the work frequency with high risk of removing foreign matters such as fallen leaves from the suction port A, Or it can be reduced.
[0012]
The predetermined time during which the condenser fan 5 is rotated in reverse at the time of startup may be variably provided by setting means such as a timer relay .
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a capacitor unit (embodiment).
FIG. 2 is an electric circuit diagram of a main part of the control means (embodiment).
FIG. 3 is a schematic cross-sectional view of a capacitor unit (conventional embodiment).
FIG. 4 is a main part electric circuit diagram of a control means (conventional embodiment).
[Explanation of symbols]
1 Capacitor unit 4 Capacitor 5 Capacitor fan 6 Control means 9 Fan reverse relay switch (switching means)

Claims (2)

A capacitor unit mounted on the roof of the vehicle, including a horizontally disposed capacitor in which the direction of passage of outside air is directed upward and downward, and a capacitor fan that generates an outside air flow downward from above the capacitor;
Switching means for switching the rotation direction of the condenser fan,
Only at the initial stage of startup at the time of startup , reverse the condenser fan for a certain period of time after startup ,
The constant after the time, the vehicle roof-mounted air conditioning apparatus according to claim and Turkey rotated forward the condenser fan by the switching means. In the vehicle roof-mounted air conditioner according to claim 1,
A roof-mounted air conditioner for a vehicle, comprising setting means for setting the predetermined time for rotating the condenser fan in reverse .

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