JPS5819053Y2 - Temperature control device for automotive air conditioners - Google Patents

Description

[Detailed description of the invention] The present invention relates to a temperature control device for an automobile air conditioner, and in particular, when the cooler is used, the temperature of cold air is adjusted according to the heat exchange amount of the evaporator, while when the heater is used, the air is controlled by opening the air mix door. The present invention relates to a temperature control device for a parallel type automobile air conditioner, which adjusts the temperature of hot air by heating it with a heater core according to the temperature.

BACKGROUND ART Air mix type air conditioners have been well known as air conditioners for automobiles.

In this air mix system, during both cooling and heating, the cold air that has passed through the evaporator is guided into the air mix chamber by adjusting the air volume by adjusting the opening degree of the air mix door, and is heated by the heater core in the air mix chamber. By mixing it with hot air, the temperature of the blown air is adjusted according to the mixing ratio of cold air and hot air, so the air mix chamber has a large volume and requires a large space when installed in a car. It is necessary.

Therefore, small cars and the like are usually equipped with a parallel type car air conditioner such as the one according to the present invention.

In other words, when it is a cooler, the temperature of the cold air is adjusted according to the amount of heat exchanged by the evaporator, while when it is a heater, the temperature of the hot air is adjusted by heating the air with a heater core according to the opening degree of the air mix door. .

Therefore, in this parallel system, the temperature control device includes a cold air temperature adjustment device (for example, a temperature-sensitive switch member) that adjusts the temperature of the cold air cooled by the evaporator, and a cold air temperature adjustment device (for example, a temperature-sensitive switch member) that adjusts the temperature of the hot air heated by the heater core. For this reason, conventionally, two operating members (eg, temperature control levers) for operating these temperature regulating means have been provided.

For this reason, there have been problems in that the operating surface of the instrument panel, particularly in small automobiles, takes up a large space, has a complicated structure, and has complicated temperature control operations.

Therefore, the present invention has been made in view of the above-mentioned problems, and it is possible to operate the temperature-sensitive switch device of the cold air temperature control device and the air mix door of the hot air temperature control device using a single operating member. It is an object of the present invention to provide a temperature control device for an automobile air conditioner, which eliminates the above-mentioned conventional drawbacks.

That is, the present invention provides a first air passage having an evaporator, a second air passage branching from the first air passage and having a heater core, a vent door for switching between the first and second air passages, and the second air passage. an air mix door installed on the upstream side of the heater core in the passage to adjust the flow rate of air passing through the heater core; a temperature-sensitive switch device installed near the downstream of the evaporator to adjust the temperature of the cold air cooled by the evaporator; It is characterized by comprising a connecting rod for changing the operating point of the temperature-sensitive switch device, a connecting rod for changing the opening degree of the air mix door, and a single operating member for interlocking both the connecting rods. be.

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

In FIG. 1, reference numeral 1 denotes a first air passage into which air outside the vehicle interior (outside air) or air within the vehicle interior (inside air) is introduced.
An internal/external air switching door 2 for switching the introduction of air into the air passage 1 is provided, and the other end communicates with a chest outlet 4 opened in an instrument panel 3.

An evaporator 5 is interposed in the first air passage 1, and a compressor 7 and a condenser 8 are connected to the evaporator 5 via a refrigerant pipe 6 to form a refrigeration cycle circuit in which refrigerant circulates. 5, the air is cooled by heat exchange using the latent heat of vaporization.

The compressor 7 is driven by the engine 9 via a transmission mechanism 10, and the transmission mechanism 10 is provided with an electromagnetic clutch 11. When the electromagnetic clutch 11 is turned on, transmission of engine rotational force is connected to connect the compressor 7. On the other hand, when the electromagnetic clutch 11(7) is OFF, the transmission is disconnected and the compressor 7 is inactivated.

Furthermore, a blower 1 is provided downstream of the evaporator 5 in the first air passage 1 for blowing the air that has passed through the evaporator 5.
2 are arranged.

13 is a second air passage branched from the floor 12 downstream of the first air passage 1, and the other end of the second air passage 13 is a defroster outlet 14 opened near the lower end of the windshield and a defroster outlet 14 opened near the floor. Foot outlet 15
A floor door 16 is provided at the foot outlet 15 to open and close the foot outlet 15, and when the floor door 16 is opened, air from the second air passage 13 is directed to the foot outlet 15 and the defroster outlet 14. On the other hand, when the floor door 16 is closed, the air from the second air passage 13 is blown out only to the defroster outlet 14.

A heater core 17 is disposed within the second air passage 13, and the heater core 17 is connected to the radiator 18 and the engine 9.
The engine cooling water passage 19 is connected to the engine cooling water passage 19 through which engine cooling water is circulated between the heater core 1 and the heater core 1 through an inflow side and an outflow side cooling water pipe 20.
7, and the air is heated by a heater core 17 using this engine cooling water as a heat source.

Reference numeral 21 denotes a water cock interposed in the middle of the inflow side cooling water pipe 20, which controls the flow rate of engine cooling water flowing into the heater core 17.

Further, 22 indicates the first air passage 1 and the second air passage 1.
3. When the vent door 22 is closed by operating a mode lever (not shown), the first air passage 1 is opened and the second air passage 13 is closed. When opening 22, vent door 2
2, the downstream first air passage 1 is closed and the second air passage 1 is closed.
3 to open the first and second air passages 1, 13.
This is to switch between.

Further, reference numeral 23 denotes a temperature-sensitive switch device provided near the evaporator 5. As shown in FIG. It consists of a pressure diaphragm type temperature sensing device 24 that operates in the above cases, and a thermoswitch 25 that is opened and closed by the temperature sensing device 24 and linked to the electromagnetic clutch 11, and the temperature sensing device 24 is connected to the first air passage. It has an operating point adjustment knob 27 that can be slid up and down to adjust the operating point (i.e., the set temperature sensing value) of the pressure pipe 26 and temperature sensing device 24 facing near the downstream of the evaporator 5 of No. 1. When the thermo switch 25 is closed due to the operation of the temperature sensing device 24, the electromagnetic clutch 11 is turned ON to operate the compressor 7, and the evaporator 5 performs heat exchange to cool the air. When the thermo switch 25 is opened, the electromagnetic clutch 11 is turned OFF, the operation of the compressor 7 is stopped, heat exchange by the evaporator 5 is stopped, and the operating point adjustment knob 2 is turned off.
7, the temperature of the cold air cooled by the evaporator 5 is adjusted by adjusting the operating point of the temperature sensing device 24.

Further, 28 is an air mix door provided in the second air passage 13, and the air mix door 28
is provided to divide the second air passage 13 into a heater core passage 13a that communicates with the heater core 17 and a bypass passage 13b that bypasses the heater core 17. position,
b position and C position) depending on the heater core passage 13. a
Air flow rate (air volume) to (or bypass passage 13b)
For example, in position a, all the air is diverted to bypass passage 1.
3b, branched to both reverse paths 13a and 13b at position b, and adjusted to flow all the air to the heater core passage 13a at position C, so that the hot air from the heater core 17 and the bypass passage 13b are adjusted downstream of the heater core 17. The temperature of the hot air heated by the heater core 17 is adjusted by mixing the air with the cold air.

On the other hand, 29 is a temperature control operation lever provided on the instrument panel 3, etc., and as shown in FIG.
A wire 31 is connected to the temperature control operating lever 29, and the other end of the wire 31 is connected to the air via a connecting rod 32. It is connected to the mix door 28, and controls the opening and closing of the air mix door 28 in conjunction with the operation of the temperature control operating lever 29. When the temperature control operating lever 29 is in the CoLD position, the air mix door 28 is moved to the a position, that is, in the full position. Air bypass passage 1
3b, the air mix door 28 is opened as the temperature control operating lever 29 is rotated toward the HOT position, and the temperature control operating lever 2 is opened.
When 9 is in the HOT position, move the air mix door 28 to C.
The temperature control operating lever 29 is provided with a pin 33 protruding from the temperature control operating lever 29, and an engagement groove that engages with the pin 33. 34 is swingably provided, and the retaining groove 34 has a circular arc groove 34a formed concentrically with respect to the pivot shaft 30 of the temperature control operation lever 29, and the circular arc groove 34a.
a long groove 34 that is continuous with and extends in a direction away from the pivot shaft 30;
A wire 36 is connected to the intermediate lever 35, and the other end of the wire 36 is connected to the operating point adjustment knob 27 of the temperature sensing device 24 via a swinging link 37, CoLD the temperature control operation lever 29.
When the pin 33 is rotated from the position to the HOT position to a certain position, the engagement groove 340 matches the locus of the pin 33.
By sliding in the arcuate groove 34a, the intermediate lever 35 does not rotate, and therefore the operating point adjustment knob 27 does not move.
When the temperature control operation lever 29 is rotated from the fixed position to the HOT position, the pin 33 engages with the long groove 34b of the engagement groove 34, causing the intermediate lever 35 to rotate counterclockwise. The operating point adjustment knob 27 is moved downward by rotation of the intermediate lever 350 to raise the operating point (set temperature value) of the temperature sensing device 24, thereby increasing the operating temperature of the temperature sensing switch device 23; As described above, by operating the temperature control operating lever 29, the operating start point of the temperature-sensitive switch device 23 is delayed from the operating start point of the air mix door 28, and both of them are 23.2.
8 are configured to be adjusted in conjunction with each other.

Further, FIG. 3 shows the operating circuit 38 of the blower 12,
A battery 39, a floor switch 40, and a floor motor 41 that drives the floor 12 are connected in series, and the blower switch 40 has first to third fixed contacts having three resistance values: dog, medium, and small. 40a to 40c, the movable contact 40d is connected to each fixed contact 40a to 40c, and the rotation speed of the motor 41 is controlled in three stages: low, medium, and high.
2 so that the air volume can be adjusted.

Further, a solenoid 11a for the electromagnetic clutch 11 is connected to the intermediate junction 40e of the pro-a switch 40 to form an excitation circuit 42 for the solenoid 11a, and the excitation circuit 42 includes a cooler switch 43 and a thermoswitch 2.
5 are connected in series, and when the thermo switch 25 is closed together with the cooler switch 43 during cooler operation, the solenoid 11
energize a to turn on the electromagnetic clutch 11,
Further, the cooler switch 43 is configured to be open during heating, and closed during dehumidification and heating.

Next, to explain the operation of the above embodiment, when in cooler mode, the cooler switch 43 is closed by operating the mode lever, and the vent door 22 is switched to close the second air passage 13 and open the first air passage 1. When the blower switch 40 is closed in the closed state, the blower 12 is activated to suck outside air or inside air into the first air passage 1 and blow it out from the chest air outlet 4.

At that time, when the temperature of the air that has passed through the evaporator 5 is higher than the set temperature value, which is the operating point of the temperature-sensitive switch device 23, the temperature-sensitive switch device 23 is activated to turn on the electromagnetic clutch 11 and turn on the compressor 7. When activated, a refrigeration cycle circuit is formed, the evaporator 5 cools the air passing through the evaporator 5, and this cold air is blown out from the chest outlet 4 to cool the inside of the car.

When the temperature of the air passing through the evaporator 5 falls below the set temperature sensing value, the temperature sensing switch device 23 becomes inactive and the electromagnetic clutch 11 is turned OFF, causing the evaporator 5 to
Air cooling is stopped.

When the temperature of the air again exceeds the set temperature sensing value, the air is cooled by the evaporator 5, and the above operation is repeated thereafter to maintain the temperature of the cold air blown out from the chest outlet 4 at a constant value at the set value.

The temperature of this cold air can be determined by rotating the temperature control operating lever 29 from the CoLD position to the HOT position, and the temperature-sensitive switch device 23 switches the temperature control operating lever 29 to the CoLD position as shown in the A diagram in FIG. Since the operating characteristic of starting up with a delay from one position to a predetermined position allows the operating point (set temperature sensitive value) to be changed, adjustment operations can be performed freely.

On the other hand, when the heater is on, the cooler switch 43 is turned off.

Then, by operating the mode lever, the cooler switch 4
3 opens, the floor door 16 opens, and the vent door 22
When the blower switch 40 is closed in a state in which the first air passage 1 downstream of the vent door 22 is closed and the second air passage 13 is opened, the blower 12 is activated to blow inside or outside air into the first air passage. The air is sucked into the passage 1 and blown to the second air passage 13 by the blower 12. A part of the air flows through the heater core passage 13a to the heater core 17 by the air mix door 28 and is heated by the heater core 17, while the remaining air is is bypass passage 1
Bypassing the heater core 17 via 3b, the heater core 1
After being air-mixed with the warm air heated by the heater core 17 downstream of the heater core 17, the warm air is blown into the vehicle from the foot outlet 15 and the defroster outlet 14 to heat the interior of the vehicle.

The temperature of this warm air can be determined by rotating the temperature control operating lever 29 from the CoLD position to the HOT position, and the air mix door 28 opens with the opening characteristic shown in the B diagram in FIG. In other words, when the air mix door 28 is in position A, all the air flows through the bypass passage 13b and the temperature of the hot air is the lowest, and when the air mix door 28 is in position C, all the air flows through the heater core passage 13b.
It is possible to freely adjust the temperature so that the temperature of the warm air is the highest when it flows through a.

Furthermore, during dehumidification and heating, the cooler switch 43 is turned on.

Then, by operating the mode lever, the cooler switch 4
3 is closed, the floor door 16 is closed, and the vent door 22 is closed.
When the blower 12 is operated while the second air passage 13 is switched to open as in the case of the heater,
The outside air or inside air sucked into the first air passage 1 is dehumidified by the evaporator 5, and the dehumidified air is heated by the heater core 17 in the second air passage 13, and becomes dehumidified warm air from the defroster outlet 14. It is blown out and defrostered.

At this time, as shown in FIG. 4, by delaying the start point of operation of the temperature-sensitive switch device 23 by the temperature control operation lever 29 from the start point of operation of the air bulk store 28, the evaporator 5 uses air due to this delayed operation. Temperature control lever 2 provides maximum dehumidification
It is effectively performed regardless of the operation of 9.

Further, the temperature of the dehumidified hot air can be adjusted by operating the temperature control operating lever 29 in the same manner as when using the heater.

As explained above, according to the present invention, in a parallel type automobile air conditioner, a single operating member interlocks the temperature-sensitive switch device of the cold air temperature control device and the air valve/socket door of the hot air temperature control device. Since the temperature control structure of the automobile air conditioner can be simplified, the temperature control operation is also simple, and there is less space for the temperature control operation surface on the instrument panel, etc. This has the practical advantage of requiring only a small amount of time.

[Brief explanation of the drawing]

The drawings illustrate the embodiment of the present invention; Fig. 1 is an overall schematic explanatory diagram, Fig. 2 is an explanatory diagram of the main part of the mechanism, Fig. 3 is an electric circuit diagram for floor operation, and Fig. 4 is an illustration of the main parts. It is a graph showing the operating characteristics of the temperature switch means and the opening degree characteristics of the air mix door. 1...First air passage, 2...Inside/outside air switching door, 3...Instrument panel, 4
... Chest outlet, 5 ... Evaporator, 6 ... Refrigerant piping, 7 ... Compressor, 8 ... Condenser, 9 ... ... Engine, 10 ... Transmission mechanism, 11 ... Electromagnetic clutch, 11a ... Solenoid, 12 ...
...Proa, 13...Second air passage, 13
a...Takoa passage, 13b...Bypass passage, 14...Defroster outlet, 15.
...foot outlet, 16...floor door,
17... Heater core, 18... Radiator, 19... Engine cooling water passage, 20...
...Cooling water pipe, 21...Water cock,
22...Vent door, 23...Temperature-sensitive switch device, 24...Temperature-sensing device, 25...
...Thermo switch, 26...Pressure pipe, 2T.
...Operating point adjustment knob, 28...Air mix door, 29...Temperature control operation lever, 30...Pivot, 31...Wire , 32...... consecutive rod, 33... pin, 3
4...Engagement groove, 34a...Circular groove, 3
4b...Long groove, 35...Intermediate lever,
36... wire, 37... continuous rod, 3
8... Operating circuit, 39... Battery,
40...Proa switch, 40a-40c...
...Fixed contact, 41...Proa motor,
42... Excitation circuit, 43... Cooler switch, 40d... Movable contact, 40e...
...Intermediate point.

Claims (1)

[Scope of utility model registration request] A first air passage having an evaporator, a second air passage branching from the first air passage and having a heater core, a vent door for switching between the first and second air passages, and the second air passage being installed upstream of the heater core. an air mix door that adjusts the flow rate of air passing through the heater core; a temperature-sensitive switch device that is installed near the downstream of the evaporator and adjusts the temperature of the cold air cooled by the evaporator; and an operating point of the temperature-sensitive switch device. A temperature control device for an air conditioner for an automobile, comprising a connecting rod that changes the opening degree of the air mix door, a connecting rod that changes the opening degree of the air mix door, and a single operating member that interlocks both the connecting rods. .