JPH0769036A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To simplify design work or manufacturing work of a unit case, and improve the working efficiency in cooler unit installing work by preventing excessive electric power consumption of a blower motor when an evaporator is not installed. CONSTITUTION:A coolerless unit 3 is composed of a unit case 9 in which an evaporator 2 can be installed and a heating register unit 10 fitted by recesses and projections to a connector arranged on an outer wall surface of this unit case 9. An electric resistance is put in a heating resistance circuit enclosed in the heating register unit 10 so as to reduce supply voltage more to a blower motor by a reduced air quantity by a pressure loss of the evaporator 2 than in a cooling resistance circuit enclosed in a cooling register unit 13. In the case where a cooler unit 12 is installed, when the evaporator 2 is installed in the unit case 9, a required process is only to fit the cooling register unit 13 by recesses and projections to the connector instead of the heating register unit 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner in which a duct is a unit case capable of mounting the evaporator even when the evaporator is not mounted.

[0002]

2. Description of the Related Art Conventionally, in a vehicle air conditioner including a blower unit, a cooler unit, and a heater unit, a hollow duct is installed instead of the unit case of the cooler unit when the evaporator is not mounted. This hollow duct has been abandoned when the evaporator was installed, but in recent years, the problem of waste treatment,
Due to cost reduction, an increasing number of vehicle air conditioners have replaced the hollow duct with a unit case of a cooler unit.

As described above, when the unit case to which the evaporator can be attached is used, the ventilation resistance of the air flowing through the unit case into the vehicle compartment by the blower becomes smaller than that when the evaporator is attached. Therefore, the power consumption of the blower motor becomes excessive, which may damage the blower motor. Therefore, as a conventional technique, there has been one in which an electric resistance is inserted in a blower drive circuit to reduce the output of a blower motor, but with such a configuration, an evaporator is attached when installing a cooler unit such as an evaporator. In addition to the work, it is necessary to remove the electric resistance placed in the blower drive circuit, resulting in a problem of extremely poor work efficiency.

In order to solve the above-mentioned problems, for example, as shown in Japanese Utility Model Publication No. 56-39688 and FIG. 8, the blower blows air into the unit case 101 without an evaporator. A coolerless unit 100 for a vehicle air conditioner has been proposed in which throttle means such as a throttle plate 102 that restricts passage of air is installed.

[0005]

However, in the conventional coolerless unit 100, as shown in FIG. 8, it is necessary to study the shape of the fixing groove 103 for fixing the diaphragm plate 102 to the unit case 101. However, there is a problem that the design work of the unit case 101 and the diaphragm plate 102 becomes complicated because there is a need to examine the shape of the diaphragm plate 102 itself.

Further, since the fixing groove 103 is required to be provided for the unit case of the cooler unit which is currently flowing, it is necessary to modify the mold for the unit case, so that the unit case is manufactured. There was a problem that the cost increased.

The present invention can prevent excessive power consumption of the blower motor when the evaporator is not attached, simplify the design work and manufacturing work of the unit case, and improve the work efficiency of the evaporator installation work. It is an object of the present invention to provide a vehicle air conditioner capable of improving the air conditioning.

[0008]

According to the present invention, a unit case to which an evaporator can be attached, a blower for generating an air flow toward the vehicle interior in the unit case, and a blower for the blower according to a supply voltage are provided. A blower motor that changes a rotation speed, and a vehicle air conditioner in which a cooler register unit including a cooler resistance circuit that changes a supply voltage to the blower motor when the evaporator is attached is installed. When mounted, instead of the cooler register unit, a coolerless resistor that has a built-in coolerless resistance circuit that changes the supply voltage to the blower motor and reduces the supply voltage to the blower motor as compared to the cooler resistance circuit The technical means of using the unit was adopted.

[0009]

According to the present invention, the supply voltage to the blower motor becomes smaller when the evaporator is not attached than when the evaporator is attached. Therefore, when the evaporator is not attached, the blower rotates to move the inside of the unit case into the passenger compartment. Even if the ventilation resistance of the air flowing toward the blower becomes small, the power consumption of the blower motor when the evaporator is not attached does not become excessive.

Since it is not necessary to install a diaphragm means such as a diaphragm plate in the unit case, it is not necessary to consider the shape of the diaphragm plate or the shape of the fixing groove of the diaphragm plate. Therefore, when the evaporator is not attached, The unit case design work is simplified. Furthermore, since the cooler unit that can be equipped with an evaporator is currently in use as a unit case, it can be used as it is even when the evaporator is not installed, so there is no need to modify the mold of the unit case. Manufacturing work is simplified.

Further, when the evaporator is installed, the work of installing the evaporator in the unit case and the coolerless register unit having the built-in coolerless resistor circuit necessary for changing the airflow of the blower are replaced by the blower airflow. The cooler is configured by the simple work of installing a cooler register unit that has a built-in resistor circuit for the cooler necessary to change the.

[0012]

【Example】

[Configuration of Embodiment] Next, a vehicle air conditioner of the present invention will be described based on an embodiment shown in FIGS. 1 to 5.
Here, FIG. 1 is a view showing an air conditioner for an automobile, and FIG. 2 is a view showing a coolerless unit and a cooler unit thereof.

The air conditioner for a vehicle adjusts the temperature in the vehicle compartment by heating the blower unit 1 for blowing air into the vehicle compartment, the coolerless unit 3 not equipped with the evaporator 2, and the air blown into the vehicle compartment. Heater unit 4
It has and. Here, the evaporator 2 constitutes a refrigeration cycle together with the compressor, the condenser, the receiver, and the box-type expansion valve 11, and is a heat exchanger for exchanging heat between the refrigerant and the air to cool the air.

The blower unit 1 includes a blower case 5 forming a windward duct, an inside / outside air switching damper (not shown) rotatably mounted in the blower case 5, and an air flow toward the vehicle compartment. It is composed of a blower 6, a blower motor 7 for rotating the blower 6, and the like.

The blower case 5 contains air inside the vehicle (inside air).
An inside air inlet (not shown) for introducing the air and an outside air inlet (not shown) for introducing the air (outside air) outside the vehicle are formed. The opening ratio of these inlets is adjusted by an inside / outside air switching damper. The blower 6 sucks air from either the inside air introduction port or the outside air introduction port, which is opened, and blows the air into the passenger compartment. Blower motor 7
Is for rotating the blower 6 at a rotation speed according to the supply voltage controlled by the blower drive circuit 8.

The coolerless unit 3 includes a unit case 9 forming an intermediate duct, and the unit case 9
Heating register unit 10 mounted on the outer wall of a building
Consists of. The unit case 9 is composed of an upper case 9a and a lower case 9b which are vertically divided into two parts, and are assembled and fixed by fasteners (not shown) such as screws and clamps. The heating register unit 10 is provided in the upper case 9
It may be installed in either a or the lower case 9b.

Here, at the time of the cooler, as shown in FIGS. 1 and 2, the upper case 9a and the lower case 9b are divided, and the evaporator 2 provided with the box-shaped expansion valve 11 is mounted,
Attach the drain hose 2a to the unit case 9. Then, the cooling register unit 13 is replaced with the heating register unit 10. In this embodiment, the cooler unit 12 is composed of the evaporator 2, the unit case 9, the box type expansion valve 11, the drain hose 2a, and the cooling register unit 13, and the unit case 9 has a recent problem of waste disposal and cost reduction. Is also used as the coolerless unit 3 and the cooler unit 12.

The heater unit 4 includes a heater case 14 forming a leeward duct, a heater core 15 arranged in the heater case 14, and two air mix dampers 1 rotatably mounted near the heater core 15.
It is composed of 6 etc. The heater case 14 is formed with a defroster outlet 17, a face outlet 18, a side face outlet 19, and a foot outlet 20, and the outlets 17 to 20 are opened and closed by an outlet damper (not shown). It

The heater core 15 is a heat exchanger that heats the engine cooling water and the air flowing in the heater case 14 by exchanging heat with each other. The two air mix dampers 16 adjust the amount of air passing through the heater core 15 and the amount of air bypassing the heater core 15, and each of the air outlets 17 to 17.
The temperature of the air blown from 20 is adjusted.

Next, the blower drive circuit 8 will be described in detail with reference to FIGS. Blower drive circuit 8
As shown in FIG. 3, it is composed of a battery 21, an air flow rate changeover switch 22 of the blower 6, and a heating register unit 10 mounted on the vehicle.

The air volume changeover switch 22 is attached to an operation panel (not shown) provided in front of the interior of the automobile. The air volume changeover switch 22 has a Hi contact 2
3, the Me contact 24, the Lo contact 25, or an OFF contact (not shown) to connect the blower 6 to the air volume level of the strong wind (Hi mode), medium wind (Me mode), weak wind (Lo mode), and stop ( This switch is fixed to either OFF).

The heating register unit 10 is a coolerless register unit of the present invention, and has a heating resistor circuit 27 built in a register box 26 (see FIG. 2). The heating register unit 10 has a Hi terminal 28, M connected to a Hi contact 23 of an air volume changeover switch 22.
Me terminal 29 connected to the e-contact 24, Lo terminal 30 connected to the Lo contact 25, and V connected to the battery 21.
It has an external connection terminal such as a terminal (ground terminal) 31 and has a structure in which a connector (not shown) provided on the outer wall surface of the unit case 9 is fitted in an uneven shape.

The heating resistance circuit 27 is the coolerless resistance circuit of the present invention, and controls the air volume of the blower 6 to Hi.
It is a circuit that switches to any one of the mode, the Me mode, and the Lo mode, and includes electrical resistances 32 to 34 connected in series, and a thermal fuse 35 connected between the electrical resistances 32 and 33.

The electric resistance 32 is the register box 36 of the cooling register unit 13 shown in FIG. 4 (see FIG. 2).
The supply voltage to the blower motor 7 is made smaller than that of the cooling resistance circuit 37 incorporated therein. It should be noted that the electric resistance value of the electric resistance 32 is equal to the amount of air flow reduction due to the pressure loss of the evaporator 2 when the cooler is not used.
It is calculated based on FIGS. 5 and 6. FIG. 5 shows motor characteristic data showing the relationship between the rotation speed of the blower motor 7 and the current value, and FIG. 6 shows blower characteristic data showing the relationship between the pressure loss of the evaporator 2 and the air volume of the blower 6.

The temperature fuse 35 melts and cuts off the heating resistance circuit 27 when the temperature of the heating resistance circuit 27 rises abnormally, such as when the blower motor 7 is locked. Here, the cooling resistance circuit 37 of the cooling register unit 13 is wired in the same manner as the heating resistance circuit 27 except that the electric resistance 32 is not connected.
Therefore, in the cooling resistance circuit 37, the same functional objects are given the same numbers as the heating resistance circuit 27. The cooling resistor unit 13 is the cooler resistor unit of the present invention, and the cooling resistor circuit 37 is the cooler resistor circuit of the present invention.

[Operation of Embodiment] Next, the operation of the vehicle air conditioner 1 of this embodiment will be briefly described with reference to FIGS. 1 to 3.

When the blower 6 is operated in the Hi mode by connecting the air volume changeover switch 22 to the Hi contact 23,
i contact 23 and Hi terminal 2 of heating register unit 10
8 are connected. As a result, the battery voltage (for example, 12 V) of the battery 21 is reduced by the electric resistance 32 of the heating resistance circuit 27 and supplied to the blower motor 7, and the blower 6 is operated in the Hi mode (strong wind).

Further, the air volume changeover switch 22 is set to the Me contact 2
4 and the blower 6 is operated in the Me mode, the Me contact 24 and the Me of the heating register unit 10 are connected.
The terminal 29 is connected. As a result, the battery voltage of the battery 21 (for example, 12 V) is reduced by the electric resistances 32 and 33 of the heating resistance circuit 27 and supplied to the blower motor 7, and the blower 6 is operated in the Me mode (medium wind).

Further, when the blower 6 is operated in the Lo mode by connecting the air volume changeover switch 22 to the Lo contact 25, the Lo contact 25 and the L of the heating register unit 10 are connected.
The o terminal 30 is connected. As a result, the battery voltage of the battery 21 (for example, 12 V) is reduced by the electric resistances 32 to 34 of the heating resistance circuit 27 and supplied to the blower motor 7, and the blower 6 is operated in the Lo mode (weak wind).

At this time, when the evaporator 2 is not installed in the unit case 9 and the unit case 9 for the cooler unit 12 is used, the blower 6 is operated and the ventilation resistance of the air flowing into the vehicle compartment is increased. Becomes smaller.
However, in this embodiment, the blower motor 7 is adjusted so that the amount of air flow reduction due to the pressure loss of the evaporator 2 is about the same.
The electric resistance 32 for lowering the supply voltage to the heating resistance circuit 2
7, the power consumption of the blower motor 7 does not become excessive.

Also, the evaporator 2 and the drain hose 2
a, box-type expansion valve 11 and cooling register unit 13
When the cooler unit 12 consisting of is mounted in the unit case 9, the evaporator 2 and the box-shaped expansion valve 11
And the cooling register unit 13 in place of the heating register unit 10 is fitted into the connector provided on the outer wall surface of the unit case 9 in a concavo-convex manner. As a result, there is a concern that the air volume of the blower 6 will decrease due to the pressure loss due to the installation of the evaporator 2 in the unit case 9. However, as shown in FIG.
Since the electric resistance 32 is not initially included in the cooling resistance circuit 37 of No. 3, the work efficiency is improved.

[Effects of the Embodiment] As described above, in the automobile air conditioner 1, the supply voltage to the blower motor 7 becomes smaller when the evaporator 2 is not attached than when the evaporator 2 is attached. Even if the ventilation resistance of the air in the unit case 9 becomes small, the power consumption of the blower motor 7 does not become excessive and damage to the blower motor 7 can be prevented.

Since it is not necessary to install a diaphragm means such as a diaphragm plate in the unit case 9, the shape of the diaphragm plate,
It is not necessary to consider the shape of the fixed groove of the diaphragm plate. Therefore,
Since the design work of the unit case 9 can be simplified, the cost can be reduced. Furthermore, the unit case 9 of the cooler unit 12 in which the evaporator 2 can be currently mounted
However, since it can be used as it is even when the evaporator 2 is not attached, it is not necessary to modify the molding die of the unit case 9. Therefore, the manufacturing work of the unit case 9 can be simplified, and the cost can be further reduced.

Further, the evaporator 2 and the drain hose 2
a, box-type expansion valve 11 and cooling register unit 13
When installing the cooler unit 12 consisting of
The heating register unit 10 having the heating resistance circuit 27 required for switching the air flow rate is replaced with the cooling register unit 13 having the cooling resistance circuit 37 required for switching the air flow rate of the blower 6 without waste. The cooler unit 12 can be attached only by a simple replacement operation.

That is, since it is not necessary to perform the troublesome work of removing the electric resistance put in the blower drive circuit when the cooler unit 12 is installed, the work efficiency of the installation work of the evaporator 2 can be improved, and Cost reduction can be achieved. Furthermore, the air flow reduction due to the pressure loss of the evaporator 2 can be compensated for only by exchanging with the cooling register unit 13.

[Modification] In this embodiment, the electric resistance 32 is inserted in the heating resistance circuit 27, but the coolerless resistance circuit is provided with resistance means such as a power transistor and a variable resistance capable of reducing the voltage. May be.

In this embodiment, the blower pushing type air conditioning unit in which the air flows in the order of the blower unit 1, the coolerless unit 3 and the heater unit 4 is used. A blower suction type air conditioning unit whose position is reversed may be used.

In this embodiment, the unit case 9 of the coolerless unit 3 is divided into two upper and lower cases 9a, 9a.
Although b is used, the shape of the unit case may be freely changed as long as the evaporator 2 can be mounted later. For example, as shown in FIG. 7, an opening 91 may be opened on the side surface of the unit case 9 and the evaporator 2 may be inserted from there. In this case, the opening 91 may be closed with a lid or the like during use.

[0039]

According to the present invention, by using the coolerless resistance circuit which reduces the supply voltage to the blower motor as compared with the cooler resistance circuit when the evaporator is not attached,
Since it is possible to prevent excessive power consumption of the blower motor when the evaporator is not attached, it is possible to prevent damage to the blower motor. Since the design work and the manufacturing work of the unit case can be simplified, the manufacturing cost of the unit case can be reduced.

Further, when installing the evaporator, the cooler can be constructed by performing the work of installing the evaporator in the unit case and the simple work of installing the cooler register unit in place of the coolerless register unit. It is possible to improve the work efficiency of the mounting work.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an air conditioner for an automobile using the present invention.

FIG. 2 is an exploded view showing the vehicle air conditioner of FIG.

FIG. 3 is a circuit diagram showing a blower drive circuit without a cooler.

FIG. 4 is a circuit diagram showing a cooling resistance circuit.

FIG. 5 is a graph showing a relationship between a rotation speed of a blower motor and a current value.

FIG. 6 is a graph showing the relationship between the pressure loss of the evaporator and the air volume of the blower.

FIG. 7 is a configuration diagram showing a modified example of the present invention.

FIG. 8 is a perspective view showing a conventional coolerless unit.

[Explanation of symbols]

2 Evaporator 3 Coolerless unit 6 Blower 7 Blower motor 8 Blower drive circuit 9 Unit case 10 Heating register unit (coolerless register unit) 12 Cooler unit 13 Cooling register unit (cooler register unit) 27 Heating resistor circuit (for coolerless) Resistance circuit) 32 Electric resistance 37 Cooling resistance circuit (cooler resistance circuit)

Claims (1)

[Claims] 1. A unit case to which an evaporator can be attached, a blower for generating an air flow toward the vehicle interior in the unit case, and a blower motor for changing the rotation speed of the blower according to a supply voltage. In a vehicle air conditioner in which a cooler register unit including a cooler resistance circuit that changes a supply voltage to the blower motor is installed when the evaporator is installed, the cooler register unit is installed when the evaporator is not installed. Instead of using the coolerless resistor unit, the coolerless resistor circuit that changes the supply voltage to the blower motor and reduces the supply voltage to the blower motor compared to the cooler resistor circuit is used. Vehicle air conditioner.