JPH04976Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a blower device for an automobile, and more particularly, to an improvement of a blower device for an automobile provided with an air passage for cooling a blower motor.

[Conventional technology]

Generally, an air conditioner for an automobile uses a blower provided inside to powerfully blow inside or outside air to perform cooling or heating. That is, as shown in FIG. 4, a cowl duct 2 is provided below a cowl top grille 1 of an automobile, and forms an outside air intake port 3. An inside/outside air switching box 4 is provided below the cowl duct 2, and an air intake door 5 is pivotally mounted inside the inside/outside air switching box 4. A blower case 6 is provided below the inside/outside air switching box 4, and a blower blade 7 is provided within the blower case 6, and the blower blade 7 is rotationally driven by a motor 8. A cooling pipe 9 forming an air passage for cooling the motor 8 is provided below the blower case 6, and takes in a portion of the conditioned air generated by the rotation of the blower blades 7 to cool the motor 8. 8 to cool it by blowing air into the inside (see Utility Model Application Publication No. 1986-860). Note that the reference numeral 11 in the figure is a front window glass.

[Problems with conventional technology]

By the way, in the conventional automobile blower device configured as described above, the air intake port 10 of the cooling pipe 9 is always open, and when the blower blade 7 is operating, the motor is always closed. 8
Since it was configured to allow cooling air to flow into the interior, it would become overcooled in the winter, causing a change in the coefficient of friction between the brushes of the motor 8 and the commutator, which could generate abnormal noise. In addition, powder snow in winter and raindrops in rainy weather enter the motor 8 together with the blown air, causing rust to occur inside the motor 8. Furthermore, along with the air, floating objects such as dust and fluff enter through the air intake port 10 and tend to accumulate inside the motor 8, and if dust or the like adheres between the brushes and the commutator, electricity will no longer be conductive. In some cases, the motor 8 became unable to rotate.

Therefore, the technical problem of this invention is to introduce cooling air to the motor only when necessary, to prevent the generation of abnormal noise from the motor, to prevent rust from forming inside the motor, and to ensure that the motor rotates. The object of the present invention is to provide a possible blower device for an automobile.

[Technical means of the present invention]

In order to achieve this technical problem, in the present invention, when the air passage is in the closed state, the air passage is blocked to prevent the introduction of cooling air to the motor, and when the air passage is in the open state, the air passage is opened to provide cooling to the motor. A valve for introducing air is provided in the air passage, and it is detected whether the temperature of the motor is above a predetermined value, and when the temperature is above the predetermined value, the valve is opened, and when the temperature is below the predetermined value, the valve is closed. A control circuit is provided to control the state.

[Effect]

Therefore, in the present invention, the air passage is closed at all times by a valve provided in the air passage, and when the motor temperature rises, the air passage is opened upon receiving an instruction from the control means; This introduces cooling air into the motor.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings. Incidentally, elements that are the same as those in the prior art are given the same reference numerals and explanations will be omitted.

As shown in FIG. 1, in the automobile blower device 12 according to the present embodiment, a valve 14 is provided at the air intake port 13 of the cooling pipe 9 forming an air passage.
The valve 14 is configured to be opened and closed by an actuator 16 comprising a solenoid valve 15. That is, the actuator 16 is connected to a battery 17 and a temperature switch 18 (e.g., a bimetallic switch) that constitutes the control device disposed on the surface of the motor 8, thereby forming an actuator operating circuit 19. . Therefore, in the automobile blower device 12 according to the present embodiment, when the internal temperature of the motor 8 rises and reaches a predetermined temperature or higher, the temperature switch 18 is turned on and the actuator operating circuit 19 is turned on. A current flows through. and,
The solenoid valve 15 operates against the urging force of the spring 20 to open the valve 14, and the air intake port 13 is opened. Therefore, cooling air flows in from the air intake port 13, passes through the cooling pipe 9, and flows into the motor 8. When the surface temperature of the motor 8 falls below a certain temperature, the temperature switch 18 is turned OFF, power supply to the actuator operating circuit 19 is stopped, and the solenoid valve 15 is turned off.
is returned to its original position by the biasing force of the spring 20, and the valve 14 closes the air intake port 13.

FIG. 2 shows a second embodiment of the automobile blower device according to the present invention.

In the automobile blower device 21 according to the present embodiment, the battery 26
The rotational speed of the motor 8 is changed by increasing or decreasing the current from the motor. In the automobile blower device 21 according to the present embodiment, the actuator 16 and the battery 17 are connected to each other by the circuit 28, which controls the circuit 27 for the maximum rotation of the motor 8, without using any of the registers 22, 23, and 24. In between, it is connected to the actuator actuation circuit 19.

Therefore, in this embodiment, when the motor 8 is rotating at maximum speed and the temperature of the motor 8 rises above a certain temperature, the temperature switch 18 is turned ON. Actuator actuation circuit 19 from battery 26 via circuit 28
When a current flows through the solenoid valve 15, the solenoid valve 15 is activated, the valve 14 is opened, and the air intake port 13 is opened. Furthermore, when the motor 8 is cooled down to a predetermined temperature or lower, the temperature switch 18 is turned off.
The actuator operating circuit 19 is not energized and the solenoid valve 15 returns to its original position, so the valve 14 is closed and the air intake port 13 is closed. In addition, in this example,
An example will be explained in which the blower switch 25 forms a circuit that sets the motor at the maximum rotational position, and the temperature switch 18 is formed by an AND circuit so as to energize the actuator 16 when a temperature higher than a predetermined temperature is detected. However, the present invention is not limited to the above-mentioned embodiment, and the actuator 16 may be energized when the blower switch 25 reaches the motor maximum rotation position.

Further, FIG. 3 shows a third embodiment of the present invention. In the automobile blower device 29 according to the present embodiment, the driving part 30 of the air intake door 5 and the opening/closing means 31 of the valve 14 are connected by a connecting means 32 such as a push-pull cable, so that the air intake door 5 Internal air circulation position (position indicated by the broken line in the diagram)
When this happens, the valve 14 is configured to open.

Note that the means for controlling the opening and closing of the valve 14 is not limited to the above embodiments, and the design may be changed as appropriate.

[Effect of idea]

The present invention has the above-mentioned configuration, and does not supply cooling air to the motor all the time, but only when necessary. It becomes supercooled,
It is possible to prevent a situation where abnormal noise occurs. In addition, the air passage for cooling the motor is only opened when necessary, and the air intake port is normally blocked, so powdery snow in winter and raindrops in rainy weather can enter the motor. This can prevent the occurrence of rust. Furthermore, it is possible to prevent floating objects such as dust and fluff from entering the motor, and to ensure that the motor always operates reliably.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing a first embodiment of an automobile blower device according to the present invention, FIG. 2 is a conceptual diagram showing a second embodiment of an automobile blower device according to the present invention, and FIG. 3 is a conceptual diagram showing a second embodiment of an automobile blower device according to the present invention. FIG. 4 is a conceptual diagram showing a conventional blower device for an automobile. 7... Blower (blower blade), 8... Motor, 9... Air passage (cooling pipe), 12, 21,
29...Automotive blower device, 14...Valve.

Claims (1)

[Claims for Utility Model Registration] In a blower device for an automobile having a blower, a motor for rotationally driving the blower, and an air passage for cooling the motor, when the air passage is closed in the closed state, the motor is closed. A valve that prohibits the introduction of cooling air to the motor and opens an air passage to introduce cooling air to the motor when it is in an open state; and a valve that detects whether the temperature of the motor is above a predetermined value, A blower device for an automobile, comprising: a control circuit that controls the valve to be in an open state when the value is lower than a predetermined value, and controls the valve to be in a closed state when the value is below a predetermined value.