JPS5816415Y2 - Evaporator case structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a case structure for an evaporator in an automatic single-phase air conditioning unit.

Normally, an air conditioning unit for an automobile has an inside/outside air introduction section and an inside/outside air switching damper installed inside the air conditioning unit. ) Air conditioning is possible by introducing air into the vehicle, and the air introduction system is designed to allow natural ventilation by introducing outside air while driving, as well as forced ventilation by a blower.

In addition, when a heating unit and a cooling unit are installed together, the cooling unit is connected to the inside and outside air introduction section so that the inside and outside air introduction section can also be used for blower ventilation with one blower. Typically, a heating unit including a blower is further connected to the heating unit, an example of which is shown in FIG.

In the figure, an inside/outside air introduction unit 1 that switches between inside and outside air is connected to a cooling unit 2 and a heating unit 3.
are connected in series.

The inside/outside air introduction unit 1 includes an inside/outside air switching damper 14 installed inside an inside/outside air introduction duct (10) having an outside air inlet 11, an inside air inlet 12, and an outlet 13 to be connected to the outside air inlet of the vehicle. The cooling unit 2 includes a cooling evaporator 23 installed inside an evaporator case 20 having an inlet 21 and an outlet 22.

Further, the heating unit 3 includes a blower 32 built in a case 30 having an inlet 31, and also includes a cold/hot switching damper and a heating coil (both not shown).

Of course, the case 30 is provided with a cold air outlet and a hot air outlet (both not shown), and during cooling operation, refrigerant is supplied to the evaporator 23 and cooled air is discharged from the cold air outlet into the vehicle interior, and heating operation is performed. A heat source is supplied to the heating coil, and the air ventilated through the evaporator 23, which is not supplied with refrigerant, is warmed and discharged into the vehicle from the hot air outlet.

By the way, recently, as shown in FIG. 2, a secondary air inlet 24 has been installed on the windward side of the evaporator 23 in the evaporator case 20.
has been proposed.

This secondary air inlet 24 is particularly suitable for the blower 32 during cooling operation.
This is intended to improve the cooling capacity by increasing the amount of air taken in by the blower 32, and this effect is achieved because the pressure inside the case 20 becomes smaller than the pressure outside the case when the blower 32 ventilates the air.

However, in the case of natural ventilation by introducing outside air, the pressure inside the case becomes higher than the pressure outside the case, so outside air leaks through the secondary air inlet 24, and in the case of simply introducing outside air, there is no problem. Although there is no problem, there is a drawback that relatively cold outside air leaks, especially during heating operation, reducing the heating ability and causing discomfort to the passenger.

An object of the present invention is to enable an evaporator case having a secondary air inlet to prevent leakage of outside air from the secondary air inlet in the case of natural ventilation by introducing outside air with a simple structure.

In the present invention, a damper is provided in the evaporator case to open and close the secondary air inlet according to the pressure difference between the inside and outside of the case.

Examples of the present invention will be described below.

FIG. 3 is a view showing an embodiment of the present invention, and is a view showing the secondary air inlet 24 portion of the evaporator case 20 from the inside of the case.

In the figure, in this embodiment, a damper 25 is provided inside the case 20 so that the secondary air inlet 24 can be opened and closed.

This damper 25 is a film-like flexible root, and only the upper edge thereof is fixed, so that it is easily bent by the pressure difference between the inside and outside of the case 20 to open and close the secondary air inlet 24.

That is, when ventilation is performed by the blower, the pressure inside the case 20 becomes smaller than the pressure outside the case, so the damper 25 receives pressure toward the inside of the case and opens the secondary air inlet 24. Conversely, when natural ventilation is performed by introducing outside air, the pressure inside the case 20 becomes greater than the pressure outside the case, and the secondary air inlet 24 receives pressure toward the outside of the case. block.

By using such a damper 25, during cooling/heating operation using blower ventilation, air inside the vehicle is sucked in from the secondary air inlet 24 as well, thereby increasing the air volume.

The initial objective of improving heating and cooling capacity was achieved;
During natural draft cooling/heating operation by introducing outside air, the secondary air inlet 24 is closed, so there is no leakage of outside air into the interior of the vehicle, and problems such as reduction in heating and cooling ability and discomfort to fellow passengers can be solved.

FIG. 4 shows another embodiment of the invention.

The damper 25' is a light and thin plate member, and its upper edge is attached to the case 20 by a hinge 26 so that it can be easily rotated about the hinge 26.

In this example as well, when the pressure inside the case 20 is smaller than the pressure outside the case, the damper 25' rotates to open the secondary air inlet 24 in response to pressure toward the inside of the case. Conversely, if the pressure inside the case 20 becomes greater than the pressure outside the case, the secondary air inlet 24 is operated to block the secondary air inlet 24 due to the pressure directed to the outside of the case.

In this way, the present invention utilizes the pressure difference between the inside and outside of the case to open and close the damper relative to the secondary air inlet, so there is no need for ancillary mechanisms such as knobs to switch the damper, making it simple and easy to operate. The features of the secondary air inlet can be fully utilized with an inexpensive structure.

[Brief explanation of the drawing]

Fig. 1 shows a cross-sectional view with the structure of a conventional automotive air conditioning unit partially omitted, Fig. 2 shows a conventional cooling unit from the air inlet side, and Figs. 3 and 4 show a conventional cooling unit. The first aspect of the present invention, respectively. FIG. 7 is a diagram showing main parts of the second embodiment from inside the case. In the figure, 1 is an outside air introduction unit, 2 is a cooling unit, 3 is a heating unit, 11 is an outside air introduction port, 1
2 is an inside air inlet, 14 is an inside/outside air switching damper, 20 is an evaporator case, 23 is a cooling evaporator, 24 is a secondary air inlet, 25 and 25' are dampers, 26 is a hinge, and 32 is a blower.

Claims (1)

[Scope of Claim for Utility Model Registration] An evaporator case for an automobile air conditioning unit, which has a secondary air inlet, in the secondary air inlet in the case. The evaporator is characterized in that a damper is provided which is activated by a pressure difference between the inside and outside of the case, and the damper operates to open the secondary air inlet when ventilation is performed by a blower, and closes the secondary air inlet during natural ventilation by introducing outside air. Dexterity case structure.