JPS6218484Y2 - - Google Patents

Description

[Detailed description of the invention] This invention incorporates a vehicle air conditioner, especially a cooler unit, and the refrigerant in this cooler unit.
The present invention relates to a vehicle air conditioner that can be used as a heat pump by performing reverse circulation during vehicle interior heating.

Vehicles equipped with an air conditioner usually perform heating by guiding engine cooling water to a heater core, sending air to the heater core, where heat is exchanged, and warm air is blown into the interior. There is. However, this method had the disadvantage that the coolant temperature did not rise because the engine did not warm up sufficiently when the engine was started, and it took a considerable amount of time for the heating effect of the heater core to appear. During this time, the refrigerant in the cooler cycle was forced to flow backwards. An example of such an air conditioner that can be switched to a heat pump is the one shown in Figure 1 (a similar example is the one shown in Utility Model Opening in 1983). -There is a publication No. 102607).

This is an air intake box A that forms an air intake port 8 and has a blower 7 installed inside.
Then, the air passing through the evaporator 9, heater core 6, and evaporator 9 is transferred to the temperature control lever 2.
The air conditioning unit 4 has an air mixer door 5 that distributes the air to the heater core passage or the bypass passage by operating the air conditioning unit 4, and has an air outlet 35 facing into the vehicle interior. The air mix door 5 is a control panel 1 located near the passenger seat of the vehicle.
The temperature control lever 2 is connected to the temperature control lever 2 via a cable 3, and when the temperature control lever 2 is moved to the hot side, the heater core passage is opened, while when the temperature control lever 2 is moved to the cool side, the heater core passage is closed and bypassed. I'm trying to keep the passage open. The evaporator 9 includes a compressor 10, a condenser 13, and liquid tanks 12 and 16 disposed on both sides of the condenser 13.
and two expansion valves 15 and 17 that expand refrigerant flowing in opposite directions are connected to form a cooler cycle. Each expansion valve 15, 17 is a check valve 14, 1 that regulates the flow of fluid in mutually opposite directions.
8 in parallel to each other in the cooler cycle. During normal cooling operation, the compressor 10
The high-temperature, high-pressure refrigerant compressed in is sent to the condenser 13, where the refrigerant is cooled to the condensation point and reduced to a high-pressure liquid, and then sent to the expansion valve 17, which rapidly expands the refrigerant to lower the temperature. A low-pressure gas is used to perform a cooling action in the evaporator 9. On the other hand, a four-way valve 11 is connected between the inlet pipe line 32 and the outlet pipe line 33 of the compressor 10,
By electrically or mechanically switching this four-way valve 11, the inlet pipe line 32 and the outlet pipe line 33
Each of these can be selectively connected to the evaporator side pipe line 34 or the condenser side pipe line 31. This changes the flow of refrigerant in the cooler cycle from the flow shown in Figure 2 to the first flow.
It can be used as a heat pump by reversing the flow as shown in the figure. In the cycle shown in FIG.
It becomes high temperature and high pressure, and flows into the evaporator 9. Here, heat exchange is performed with the outside air, and warm air is sent to the air outlet 35.

However, in such conventional heat pump switching type vehicle air conditioners, during heating operation, the air mix door 5 opens the heater core passage in conjunction with the operation of the temperature control lever 2. The air that has become warm after passing through 9 will inevitably pass through heater core 6. However, at this time, since the engine has not warmed up, there is not enough high-temperature cooling water in the heater core 6, and the air warmed by the evaporator 9 is absorbed by the heater core 6, causing the temperature to drop. However, there was a problem in which the immediate warming effect of the heat pump operation was reduced.

The present invention was developed by focusing on these conventional problems, and its purpose is to close the heater core passage in the air mix door 5 when the heat pump operation switch is turned on, regardless of the set position of the temperature control lever. A door operation section is provided to operate the door.
When the heat pump is operating, the air warmed by the evaporator is sent directly to the air outlet, while when the heat pump is not operating, the air mix door returns to the position corresponding to the temperature control lever position, allowing smooth heating of the vehicle interior and normal heating operations. An object of the present invention is to improve heating efficiency in a vehicle interior by providing a vehicle air conditioning system that can perform heating.

To achieve this purpose, the present invention includes a lever member 28 connected to the temperature control lever 2, a stopper 19 that engages with the lever member 28 and rotates the air mix door, and the stopper 19 and the air mix door 5. A lever member 27 whose one end is fixedly connected to the air mix door 5 constitutes a first door operation section, and rotates the air mix door 5 in the heater core passage opening direction during heating operation. The string member 21 that connects the other end of the lever member 27 and the actuator 22 constitutes a second door operation section, and when the heat pump is operated, the air mix door is moved in the heater core passage closing direction regardless of the temperature control lever position. 5 to the elastic member 20
It operates against the action of

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a diagram schematically showing a portion of the air mix door 5 in an embodiment of the present invention. In the vehicle air conditioner according to this embodiment, the air mix door 5 is fixed to a shaft 30 attached to the box or heater core 6 of the air conditioning unit 4 and is rotatable together with the shaft 30. On the other hand, a hole 36 is drilled in a portion of the air mix door 5 that is coaxial with the shaft 30, and one end of the hole 36 is connected to a first temperature control lever 2 via a cable 3 that can be operated in both push and pull directions.
A rotating shaft 29 of the lever 28 is rotatably fitted to the air mix door 5. The base end of the rotating shaft 29 of the first lever 28 has a rectangular or other square-shaped engaging part 37, and the stopper 19 has a locking hole 38 opposite to the engaging part 37. It is rotatably attached together with the lever 28 of No. 1. The stopper 19 engages with the first lever 28 while stopping the air mix door 5 via the elastic member 20.
is connected to. As the elastic member 20, a coil spring is used in this embodiment, and one end of this coil spring is connected to a part of the stopper 19, and the other end is connected to a locking fitting 40 installed on the surface of the air mix door 5. and the first lever 28
The stopper 19 and the elastic member 20 constitute a first door operation section that opens and closes the air mix door 5 in accordance with the operation of the temperature control lever 2. Note that the elastic member 20 is not limited to a coil spring as shown in the figure, but other members such as a band made of rubber material may also be used.

Further, one end of a second lever 27 is fixed to the shaft 30 on the side opposite to the first lever 28 with respect to the air mix door 5, so that it can rotate together with the shaft 30 and the air mix door 5. One end of the string member 21 is tied to the other end of the second lever 27, and the other end is connected to the actuator 22. The actuator 22 includes a vacuum solenoid 23 as shown in FIG.
An operation type can be used, and the vacuum solenoid 23 can be electrically switched. Unlike the cable 3 described above, the string member 21 is made of nylon thread or other tensile material, and as the actuator 22 contracts, the second lever 27
While pulling one end of the actuator to rotate it, no operating force is transmitted to the second lever 27 during the expansion operation of the actuator. The string member 21 and the second lever 27 constitute a second door operating member, and the opening degree of the air mix door 5, that is, the set position of the temperature control lever 2, is controlled by the operation of the second door operating member. Regardless of this, the air mix door 5 can be rotated in the direction of arrow S in FIG.

The rotation operation of the air mix door 5 by the second door operation section starts as the heat pump of the cooler cycle incorporating the evaporator 9 and the like is operated. Therefore, this vehicle air conditioner has a control circuit incorporating an air conditioner switch 25 that can switch between cooler operation and heat pump operation in order to link the second door operating section with the heat pump switching operation. This control circuit includes a power source 39, an input terminal 25a connected to the power source 39, a cooler operating terminal 25b selectively connectable to the input terminal 25a, and a heat pump operating terminal 25.
The vacuum solenoid 23 and the electromagnetic solenoid 24 are connected in parallel to the heat pump operating terminal 25c of the air conditioner switch 25 via a relay 26. Both the cooler operating terminal 25b and the heat pump operating terminal 25c are connected to the compressor 10,
The compressor 10 is activated when the air conditioner switch 25 is placed in any of the above operating states. On the other hand, the heat pump operation terminal 25c
The vacuum solenoid 23 connected to the vacuum solenoid 23 is connected to the actuator 22 through a vacuum circuit, and the output terminal of the electromagnetic solenoid 24 is operatively connected to the four-way valve 11 connected to the inflow and outflow pipes 32 and 33 of the compressor 10. . The vacuum solenoid 23 and the electromagnetic solenoid 24 are set to open the actuator 22 to the atmosphere and place the four-way valve 11 in a state of forming a cooler cycle, as shown in FIG. 4, when the heat pump is not in operation.

In a vehicle air conditioner having such a configuration,
When the air conditioner switch 25 is now switched to the cooler operating side, the compressor 10 is operated and the refrigerant in the cooler cycle is cooled and circulated, and the air that has passed through the evaporator 9 becomes cold air and heads toward the outlet 35. Therefore, by operating the temperature control lever 2, the occupant can appropriately adjust the temperature inside the vehicle. For example, when the temperature control lever 2 is moved from the hot side to the cool side as shown in FIG. The air mix door 5 is rotated in the direction of the arrow S in the figure by the actuation of the stopper 19 which can be rotated. This restricts the flow of cold air through the heater core passage, thereby promoting cooling of the vehicle interior. Conversely, temperature control lever 2
When the is moved from the cool side to the hot side, this moving operation is transmitted to the stopper 19 via the cable 3 and the first lever 28 in the opposite direction to the above case.
The stopper 19 attempts to rotate in the direction away from the air mix door 5 around the rotating shaft 29.
In this case, the elastic member 20 between the stopper 19 and the air mix door 5 acts on the air mix door 5 to rotate the air mix door 5 in the direction opposite to the arrow S in the figure.

On the other hand, while the heater core 6 is not sufficiently warmed up,
In order to use the cooler unit as a heat pump, when the air conditioner switch 25 is switched to the heat pump operation side from the state shown in FIG. 4 to the state shown in FIG. Vacuum solenoid 23 and electromagnetic solenoid 24
start operating at the same time. This electromagnetic solenoid 2
4 rotates the four-way valve 11 and switches the connections between the inlet and outlet pipes 32 and 33 of the compressor 10. As a result, the refrigerant flowing through the compressor 10 etc. circulates in the opposite direction to that during cooling, and the high temperature and high pressure refrigerant flows into the evaporator 9, so the air passing through the evaporator 9 turns into warm air and heads towards the outlet 35. . On the other hand, the operation of the vacuum solenoid 23 applies vacuum force to the actuator 22, causing the actuator 22 to contract.
This contraction operation is transmitted to the second lever 27 via the string member 21, and rotates the second lever 27 and the air mix door 5, which is fixedly connected thereto, in the direction of arrow S in the figure about the shaft 30. . This rotational movement of the air mix door 5 becomes an independent and relative rotational movement with respect to the first lever 28 and the stopper 19, and as a result of this rotation of the air mix door 5, the elastic member 20 is stretched by a tensile action. This closes the heater core passage.
The hot air passing through the evaporator 9 when the heat pump is operating goes directly to the air outlet 35 through the bypass passage. Furthermore, when the air conditioner switch 25 is switched to put the heat pump inactive, the vacuum solenoid 23 and the electromagnetic solenoid 24 are turned off to put the cooler unit in the cooler cycle state, and the actuator 22 is operated to expand. Although the operation of the actuator 22 is not transmitted to the second lever 27 and the air mix door 5 by the string member 21, it is not transmitted to the second lever 27 and the air mix door 5.
is rotated back to the position before the start of the heat pump operation by the action of the elastic member 20. The cooler unit is normally used as a heat pump in this way immediately after the engine starts, when the heater core 6 has not yet warmed up sufficiently, and by keeping the heater core passage closed during this time, warm air is is prevented from being cooled by the heater core 6, and an immediate warming effect can be achieved by operating the heat pump.

As described above, in the present invention, the first door operating section rotates the air mix door in the heater core passage opening direction during heating operation, and the second door operating section controls the temperature when heating is performed by the heat pump immediately after engine startup. Regardless of the lever setting position, the air mix door is rotated to close the heater core passage and cut off the flow of hot air to the heater core, and the hot air generated by the operation of the heat pump is cooled by the cold heater core. Since the air directly flows out from the air outlet into the vehicle interior, the interior of the vehicle can be heated instantly, and the normal heating operation can be performed smoothly. As a result, the efficiency of heating the interior of the vehicle can be improved.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a state in which a vehicle air conditioner equipped with a cooler unit capable of switching heat pump operation is used in heat pump operation, and Fig. 2 is a diagram showing the cooler unit part of the vehicle air conditioner when the cooler is in operation. , Fig. 3 is an exploded perspective view of the air mix door in one embodiment of the present invention, Fig. 4 is a diagram showing the operating state of the air mix door of the air conditioner of the present invention when the cooler is operating, and Fig. 5 is a diagram showing the operation of the heat pump. FIG. 3 is a diagram illustrating the operating state of the air mix door of the air conditioner of the present invention at the time; 2... Temperature control lever, 5... Air mix door, 6... Heater core, 9... Evaporator, 10... Compressor, 20... Elastic member, 21... String member, 22... Actuator, 27... Second... Lever, 28...first lever.

Claims (1)

[Scope of utility model registration request] It has an evaporator 9, a heater core 6, and an air mix door 5 that distributes air from the evaporator 9 to a heater core passage or a bypass passage by operating a temperature control lever 2,
In an air conditioner that can be used for heating as a heat pump by circulating the refrigerant in the cooler unit in the opposite direction to that during cooling operation and supplying it to the evaporator 9, the lever member 28 connected to the temperature control lever 2 and the lever member 28 connected to the temperature control lever 2 are provided. A stopper 19 that engages with the lever member 28 to rotate the air mix door.
The elastic member provided between the stopper 19 and the air mix door 5 constitutes a first door operating section, which rotates the air mix door 5 in the direction of opening the heater core passage during heating operation, and also allows one end of the air mix door 5 to open. Fixedly connected lever member 2
7 and a string member 21 connecting the other end of the lever member 27 and the actuator 22.
An air conditioner for a vehicle, which constitutes a door operating section of the vehicle, and operates the air mix door 5 in the heater core passage closing direction against the action of the elastic member 20, regardless of the temperature control lever position when the heat pump is operated. .