JPS6223809A - Vehicle air-conditioning device - Google Patents

Abstract

PURPOSE:To reduce the resistance of ventilation during maximum air-blasting, and to lower noise, by projecting a resistor for controlling the drive voltage of a blower in order to adjust the amount of air blasting, into a blasting air passage in accordance with the control operation of the voltage to cool the resistor. CONSTITUTION:In an air-conditioning device, a blower 3, an evaporator 4a and a heater core 5 are disposed, in the mentioned order from the upstream side, in a ventilation passage 1 having inside and outside suction ports 26, 27 at one end thereof. In the above-mentioned arrangement, there is arranged a rotatable stay 15 formed with flat sections 15a, 15b in L-like shapes which may be selectively made in close contact with an opening 28a formed in a part of scroll casing 28 for storing the blower 3. A resistor 8 for controlling the drive voltage of the blower 3 is attached on the flat section 15a of this stay 15. Further, upon setting of the maximum air-blasting amount, a solenoid valve 19 is changed over to operate a drive mechanism 9 including a diaphragm device 18 so that the stay 15 is reversed to project the resistor 18 outward.

Description

[Detailed description of the invention] (Industrial field of application) The present invention is an air conditioner for an axle (hereinafter referred to as an air conditioning bag).
In particular, the present invention relates to a type of air conditioner that adjusts the amount of light to be sent by controlling the drive voltage to the feeder using a resistor.

(Prior art) Vehicle air conditioning systems selectively operate inside and outside the vehicle. 411il'l'l'l'l'l'l'l'l'l'l'l'l'l'l'l'l'l'l'l 'l'l 'l'l 'l'l 'l'l 'l 'l 'l 'l 'l 'l 'l 'l 'l 'l '1 '1 'j It performs indoor air conditioning. In the case of an air blower equipped with an air blower using an electric sweater as a driving source, a resistor is installed (-) to control the driving voltage of the motor through the voltage drop across the resistor. Adjusting the air volume. When the voltage drops due to this resistor, heat is generated, and for this reason, in conventional air conditioners of this type, a resistor is installed in the ventilation path, and the resistance increases. A configuration was adopted in which the resistor was cooled by air flowing through the Ii circuit.

(Problems to be Solved by the Invention) However, in the above configuration, the voltage drop (-1) does not occur and therefore the heat dissipation is poor. Since the resistor is located in the ventilation path even when the Ti1 machine is at its maximum airflow, this resistor increases the ventilation resistance, causing an increase in the work of the blower fF, lIM, and a corresponding increase in the layer height. . Roughly,
Resistors tend to disrupt high-velocity airflow and create noise.

In view of these conventional problems, the present invention provides heat dissipation of a resistor.
(The purpose is to provide an air conditioner that sufficiently secures 1 and has a low bed height.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides
It is equipped with a ventilation path that selectively communicates with the outside, an air conditioning device including a blower disposed within the ventilation path, and a resistor that controls the drive power to the blower to adjust the amount of air blown. In addition, a resistor is installed in the air conditioning system for a vehicle, and a resistor is installed in the ventilation path at the entrance and exit part 1, and a drive mechanism that operates -C in response to the voltage control operation of the resistor to drive this resistor is installed. According to the above structure of the present invention, the resistor is cooled only when the voltage control operation is performed. It is projected into the ventilation passage by the drive mechanism, and the generated heat can be cooled down in 11 minutes by the air flow inside the ventilation passage. On the other hand, when the voltage control [1 operation is performed, the resistor is moved outside the ventilation path to reduce the ventilation resistance of the ventilation path, and the noise is not increased. .a3.When air is being blown outside of people's homes, ventilation resistance increases due to the protrusion of the resistor into the ventilation duct, but since the air flow velocity is relatively slow, the ventilation performance and noise control are affected. 1, but the effect on 4T is slight and not a problem.

(Embodiments) Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

FIG. 1 is a schematic diagram showing the overall configuration of an embodiment of a vehicle air conditioner according to the present invention, in which a ventilation passage 1 is constructed by connecting a plurality of casings made of heat-resistant resin or the like. This ventilation passage 1
Inside and outside air suction ports 26,27 are provided at one end, and an inside/outside air switching damper 2 for opening and closing both of these suction ports 26,27 is provided. On the other hand, at the other end of the ventilation passage 1, there are provided a plurality of lower blow-off lowers a, 7b, and 7G, and a mode switching damper 7 for switching these blow-off ports.
). Furthermore, in the ventilation path between the suction 1126.27 and the air outlets f17a, 7b, and 7c, air conditioning equipment such as a blower 3, a vaporizer 4 for dehumidification and cooling, and a heater core 5 for heating are installed in order from the upstream side. Also, adjacent to the heater core 5, cold air and warm air M
An air mix damper 6 is installed to adjust the M ratio and control the temperature of air blown into the vehicle interior. In the case of this embodiment, the resistor 8 for controlling the drive voltage of the blower 3 is
Together with the drive mechanism 9, it is arranged adjacent to the blower 3, and FIG. 2 shows its detailed configuration in an enlarged manner.

In this embodiment, the configuration of the air conditioner is a so-called full air conditioner type, but the present invention is not limited to this type, and may be a semi-air conditioner type or a configuration with only a heater core. Further, the configuration regarding the air conditioning operation and control may be the same as that of a conventional air conditioner, so the overall configuration of the air conditioner will not be described in further detail here.

=6- In FIG. 2, reference numeral 25 indicates the internal air intake port 26:
and outside air intake 1] 27;
The damper 2 is arranged in the inside/outside air switching box 25 so as to rotate about the shaft 2a to switch/open/close the inside air and outside air suction ports 26, 27. On the downstream side of this inside/outside air switching box 25, a spacer casing 28 is installed to house a blower 3 consisting of a centrifugal multi-blade fan 10 and a motor 11. A bell mouth-shaped connection port 29 is installed in the communication part with the casing 28)
It is being

The resistor 8.8' is fixed to one flat part 15aJ: of a heat-resistant resin stay 15 whose cross section is shaped like a letter 1,
It is connected to the fan speed changeover switch 12 via a flexible lead wire so that it can move together with the stay 15. As shown in detail in FIG. 5, the stay 15 has both flat portions 15a.

15b is formed into a shape that tightly fits into an opening 28a provided in the scroll casing 28, and is rotatably attached to the scroll casing 28 via a shaft 16a fixed near the L-shaped bent portion 15c. supported. Further, a gear 16 is fixed to this shaft "16a, and a conversion gear 17 that is rotatable about a shaft 17a supported by a scroll casing 28 meshes with this gear 16.
The stay 15 rotates within the opening of the scroll casing 28 as the conversion gear 17 rotates.

In addition to the gear 16 and conversion gear 17 mentioned above, the drive mechanism 9 includes a diaphragm device 18 and a solenoid valve 19 connected to the diaphragm device.

The diaphragm device 18 includes a diaphragm connected to one end of the conversion gear 17 by a rod 18a, while the solenoid valve 19 is supplied with the intake negative pressure of the vehicle engine through a conduit 20 and the atmospheric pressure through a conduit 20a. ing. Solenoid valve 19
is controlled by a fan speed selector switch 12,
The diaphragm device 18 has a structure that switches its internal circuit to introduce negative intake pressure or atmospheric pressure into the diaphragm device 18 in accordance with this control. Therefore, when negative intake pressure or atmospheric pressure is introduced by the operation of the solenoid valve 19, the diaphragm of the diaphragm device 18 reciprocates in the left-right direction in FIG. 2, and this reciprocating displacement is transmitted via the rod 18a. , rotationally drives the conversion gear 17.

FIG. 3 shows the dimensions of the electric circuit for adjusting the air flow rate and controlling the drive mechanism in this embodiment. As shown in the figure, the fan speed selector switch 12 changes the feed J11fi to l-1i.
A switching circuit (movable contact 12a, 1-
1i, Me, lo-o terminals) and a fixed contact 121) arranged to energize the coil 21a of the relay 21 when switching to the 1-11 circuit. The movable contact 12a of the changeover switch 12 is grounded via the motor 11, while the LO terminal is connected to the MO terminal via the resistor 8', the Me terminal is connected to the I'i terminal via the resistor 8,
Generally, the l-1i terminal is grounded as indicated by reference numeral 14 via a battery 13. In addition, the solenoid valve 19
is the changeover switch 12 via the contact 21b of the relay 21.
is connected to the Hi terminal of. Therefore, when 10 circuits are selected by the changeover switch 12, the movable contact 12
a is connected to the LO terminal, and an operating circuit for the motor 11 is formed through resistors 8 and 8', and in the case of Me circuit selection, an operating circuit is formed through only resistor 8 to change the terminal voltage of the motor.

When the movable contact 12a of the changeover switch 12 is switched to the H1 terminal, the voltage of the battery 13 acts directly on the motor 11, and at the same time the movable contact 12a contacts the fixed contact 12b, energizing the coil 21a of the relay 21. do. Therefore, contact 21b closes and supplies power to solenoid valve 19, which operates to connect conduit 20 to diaphragm device 18.

Next, the operation of this embodiment having the above configuration will be explained.

FIG. 2 shows the situation when the fan speed selector switch 12 is in either the LO or Me position and the resistor 8° 8' is reducing the voltage.
The explanation will be made assuming that the amount of il, that is, the changeover switch 12 is changed to 10 circuits.

At this time, the operating circuit of the motor 11 is configured in the following order as shown in FIG. The drive voltage, which is lowered by the resistors 8' and 8, is applied between the terminals of the motor 11. On the other hand, in the LOM path, the movable contact 12a is connected to the fixed 1Σ2 point 121). Since there is an open 1 NO C, the coil of relay 21 is not energized and the contact 211
) is open, no power is supplied to the solenoid valve 19, and the solenoid valve 19 is held in an operating position in which atmospheric pressure is introduced into the fluorum device 18. In this state, the die-1 aphram of the diaphragm device 18 is at the leftmost position in FIG. 2, and the stay 15 is held at the rotational position shown in FIG. 2 via the rod 18a1 conversion gear 17 and gear 16.
The resistors 8, 8' protrude into the ventilation path. For this reason, heat generation continues with the voltage drop operation.
8' is cooled by the air flow passing through the ventilation passage with one rotation of the fan 10.

Subsequently, when the selector switch 12 is switched to the 1"1 position and the maximum airflow is selected, in FIG.
By connecting the terminal 11, the ground 14, and the negative side of the battery 13 in this order, an operating circuit 11 is formed. Therefore, the heat generated by the resistor 8.8' is accumulated by 11 points, and at the same time, the movable contact 12a and the fixed contact 12b are closed, and the relay 21
Since the coil 21a) is energized and the contact 211) is closed, power is supplied to the solenoid valve 19 and the diaphragm device 18
Engine intake negative pressure is introduced into the engine. As shown in FIG. 4, the diaphragm of the diaphragm 17 and the ram device 18 is attracted by this intake negative pressure and moves to the right, thereby clockwise rotating the stay 15 via the conversion gear 17 and gear 16. Rotate in the direction. As a result, the resistor 8.8' is rotated out of the scroll casing 28, and at the same time the other flat portion 151 of the stay 15 closes the opening 28a of the scroll casing 28 by 13Jl. In this state, the fan speed selector switch 12 is changed again and the resistors 8 and 8
' is maintained until the voltage drop operation starts, so that the resistors 8 and 8' do not interact with the ventilation resistance of the ventilation path.

FIG. 6 shows the drive 1 IRf of the embodiment of the music according to the present invention, and in the same figure, the same reference numeral 11 is used for the same component as in the previous embodiment. In the drive mechanism of this embodiment, an electric motor 30 is used to rotationally drive the stay 15 instead of the first mechanical drive mechanism of the previously described embodiment. A pulley 31 is fixed to the rotating shaft 16a of the stay 15, and a pulley 32 is also attached to the rotating shaft of the motor 30.
), and a belt 33 is wound between both pulleys to transmit the driving force. In the case of this example, the maximum ventilation
: The motor 30 is rotated in the opposite direction when switching to other air blowing modes. Other configurations may be the same as those of the previous embodiment.

In this embodiment as well, the resistors 8, 8' are projected into the ventilation passage in accordance with the voltage control operation thereof, and are moved out of the ventilation passage when the maximum ventilation occurs.

FIG. 7 shows the main parts of the resistor and drive mechanism of yet another embodiment, in which the resistor 8.8' is fixed on a stay 13=39 with a stopper portion 39a above it. Ru. The stopper portion 39a is formed to serve as a lid for closing the scroll casing 280 [128a] and allows ventilation to the resistor 8.8'. is connected to. The scroll casing 28 has a stay 39 and an iron core 36 at its bottom. A solenoid stay 37 having an eleven-shaped cross section is installed so as to surround the solenoid stay 37.The solenoid stay 37 has a through hole at its bottom and supports a solenoid 35 arranged around the through hole. The stay 39 inserts the iron core 36 into this through hole,
It is slidably supported by the solenoid stay 37.

Also, between the stay 39 and the solenoid stay 37,
The coil spring 38 is inserted and the stay 39 is
It is pressed in one direction -1 toward the coal cushioning 28. In this embodiment, power is supplied to the solenoid 35 during maximum airflow, and the resistors 8 and 8' are connected to the solenoid 35.
It is driven downward in FIG. 7 by the electromagnetic force and moves out of the ventilation path. Also, when flying a kite (other than the maximum), the power supply to the solenoid 35 is reduced to 11-, so the sub-3
9 is pressed by the coil spring 38 and moves upward,
The resistors 8, 8' are made to protrude into the ventilation path. Top) The structure other than the book may be the same as the embodiment shown in FIG.

In the embodiments described so far, the resistor is installed in the scroll casing adjacent to the blower, but the installation position of the resistor is not limited to this. For example, it is also possible to install a resistor in a common path such as the inlet of the air mix damper 6. By projecting the resistor for adjusting the air volume into the ventilation path in response to its voltage control operation and cooling it, the ventilation resistance at maximum air flow that does not require the voltage drop operation of the resistor is reduced, and it is possible to At the same time, it is possible to ensure good cooling performance for the heat generated in the resistor when air is blown.

Therefore, the air blowing performance and noise performance of the air conditioner at the time of maximum air blowing are improved, and its reliability is increased. Further, according to the present invention, these improvements in performance and reliability can be achieved with a simple configuration and only a slight increase in cost compared to conventional air conditioners.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the overall configuration of an air conditioner according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part of the embodiment of FIG. 1, and FIG. The electric circuit diagram used in the embodiment, FIG. 4 is a diagram similar to FIG. 2 showing the resistor moved out of the ventilation path, and FIG. 5 shows the main parts of the drive mechanism of the embodiment of FIG. 1. FIG. 6 is a cross-sectional view of a main part of another embodiment of the present invention, and FIG. 7 is a cross-sectional view of a main part of still another embodiment of the present invention. In the figure, 1... ventilation path, 3... blower,
4... Evaporator, 5... Heater core, 8... Resistor, 9... Drive mechanism.

Claims (4)

[Claims] (1) A ventilation duct that selectively communicates between the inside and outside of the vehicle;
An air conditioner including an air blower disposed in the ventilation passage, and a resistor that controls a driving voltage to the air blower in order to adjust the amount of air blown, and the resistor can be freely moved in and out of the ventilation passage. and a drive mechanism that operates in response to voltage control operation of the resistor to drive the resistor, and cools the resistor by protruding into the ventilation path in response to the voltage control operation. A vehicle air conditioner characterized by: (2) An opening for letting the resistor in and out is provided in the ventilation path, the resistor is placed on a member movably provided with respect to the opening, and the member is mounted on the resistor. The air conditioner for a vehicle according to claim 1, further comprising a portion that closes the opening when the container is moved out of the ventilation path. (3) The amount of air blown by the blower is adjusted in at least three stages: maximum, intermediate, and minimum, and the resistor protrudes into the ventilation path during intermediate and minimum air blowing. The vehicle air conditioner described above. (4) The resistor is a scroll housing the blower.
Claims 1 to 3 disposed in the casing
The vehicle air conditioner described in any one of the preceding paragraphs.