JP5131030B2 - Blower unit for vehicle air conditioner - Google Patents

Description

  The present invention relates to a blower unit of a vehicle air conditioner, and more particularly to a blower unit of a vehicle air conditioner provided with an auxiliary inside air introduction port for taking in part of the inside air when outside air is introduced.

  As an air intake system for a vehicle air conditioner, there are an inside air circulation mode for taking in air in the vehicle and an outside air introduction mode for taking in outside air. The switching of the air intake system is performed by opening and closing the inside air introduction port and the outside air introduction port with an inside / outside air switching door provided in the blower unit in the dash panel of the vehicle. When heating the passenger compartment, the outside air introduction mode is usually selected for reasons such as preventing fogging of the window glass.

  By the way, there is a problem that the vehicle interior cannot be heated sufficiently when operated in the outside air introduction mode when the outside air is very low temperature. For this reason, in particular, the vehicle air conditioner for cold districts is provided with an auxiliary inside air introduction port for taking in part of the relatively warm inside air even in the outside air introduction mode. There exists a thing described in patent document 1 as an air blower unit of a vehicle air conditioner provided with such an auxiliary | assistant internal air introduction port.

JP 2000-247129 A

  In the blower unit of the vehicle air conditioner described in Patent Document 1, the auxiliary inside air introduction port is disposed on the bottom surface of the case between the flow path connecting the outside air introduction port and the blower, and opens and closes the auxiliary inside air introduction port. And a cover member arranged to cover the door member for this purpose. However, in the blower unit of this vehicle air conditioner, when the negative pressure generated in the case is relatively small, the door member does not open sufficiently, and as a result, a sufficient amount of air from the auxiliary inside air introduction port cannot be secured. It was. Further, since a fixing part or a cover member for fixing the door member to the case is necessary, there are many components and there is a problem in terms of cost.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a low-cost air blower unit for a vehicle air conditioner that can sufficiently secure the amount of air introduced from the auxiliary inside air introduction port. .

  The present invention provides a blower unit of a vehicle air conditioner described in each claim as a technical means for achieving the above-described problems.

  The invention described in claim 1 includes a casing (15) in which an outside air introduction port (12), an inside air introduction port (13), and an auxiliary inside air introduction port (14) are formed in different parts, and an outside air introduction port ( 12) and an inside / outside air switching door (16) for opening and closing the inside air introduction port (13), and a blower (11) for sucking air from the outside air introduction port (12), the inside air introduction port (13) and the auxiliary inside air introduction port (14) ) And an auxiliary internal air introduction door (17) for opening and closing the auxiliary internal air introduction port (14), which is pivoted to the casing (15) so as to be opened by the negative pressure generated in the casing (15) by the blower (11). In the air blower unit of the vehicle air conditioner provided with the auxiliary internal air inlet door (17) provided, the dynamic pressure of the airflow flowing from the outside air inlet (12) to the fan (11) is released by the negative pressure. So as not to act on the auxiliary inside air inlet door (17), an auxiliary inside air inlet (14) and the auxiliary inside air inlet door (17) is characterized in that it is arranged in the casing (15). As a result, the auxiliary inside air inlet door (17) is not affected by the flow from the outside air inlet (12), so that it can be reliably opened even when the negative pressure generated in the casing (15) is relatively small. It becomes possible.

  In the second aspect of the invention, the auxiliary inside air introduction port (14) is a position that is opened by the operation of the blower (11) even when the outside air introduction port (12) is closed, and the outside air introduction port ( The auxiliary internal air inlet door (17) is not subjected to the dynamic pressure of the airflow introduced from the outside air inlet (12) by being arranged at a position farther from the blower (11) than 12), that is, an upstream position. Open surely.

  In the invention according to claim 3, the casing (15) has a side surface (155s) substantially perpendicular to the suction direction (A) of the blower (11), and the auxiliary indoor air inlet (14) is the casing (15). Are formed on a substantially vertical side surface (155 s). Thereby, the flow of air from the auxiliary internal air introduction port (14) flows in without being bent, and thus flows with low resistance, thereby further ensuring the opening of the auxiliary internal air introduction port door (17).

  In the invention according to claim 4, the casing (15) includes the main body (153) and the protruding portion (155) protruding from the main body (153) in the direction opposite to the suction direction (A) of the blower (11). The projecting portion (155) has an end surface (155s) facing the blower (11), and the end surface (155s) forms a substantially vertical side surface (155s). Thereby, even when water infiltrates from the outside air inlet (12), the invaded water is prevented from reaching the auxiliary inside air inlet (14). Moreover, since the protrusion part (155) has a smaller cross-sectional area than the main body part (153), the effect that the occupied volume of the casing (15) is reduced is also obtained.

  In the invention according to claim 5, the substantially vertical side surface (155s) of the casing (15) extends substantially vertically. Thereby, since the rotational force which acts so that it may close based on the dead weight of auxiliary | assistant internal air introduction door (17) becomes small, the openability of auxiliary | assistant internal air introduction door (17) can further be improved.

  In the invention according to claim 6, the casing (15) includes a protrusion (156) protruding from the inner surface of the casing (15), and the auxiliary inside air inlet door (17) receives the protrusion (156). The auxiliary inside air inlet door (17) is supported by the protrusion (156) in the support hole (171) and rotates. Thereby, the structure for supporting and rotating the auxiliary inside air inlet door (17) can be provided simply and inexpensively without additional parts.

  In addition, the code | symbol in the bracket | parenthesis of each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

  FIG. 1 shows an embodiment of the present invention, and is a longitudinal sectional view in an outside air introduction mode of a blower unit 10 for switching and introducing inside air or outside air in a vehicle air conditioner. Although the air downstream side from the blower unit 10 is not shown in FIG. 1, an evaporator is disposed on the air downstream side, and the air blown downstream by the blower 11 is cooled while passing through the evaporator. It is blown out into the passenger compartment. The evaporator is connected to a compressor (not shown), a condenser, an expansion valve, and the like so that the refrigerant flows, and constitutes a known refrigeration cycle.

  The blower unit 10 shown in FIG. 1 is normally disposed on the passenger seat side below the instrument panel at the front of the interior of the automobile. The blower unit 10 includes a casing 15 in which an outside air introduction port 12, an inside air introduction port 13, and an auxiliary inside air introduction port 14 are formed, an inside / outside air switching door 16 that opens and closes the outside air introduction port 12 and the inside air introduction port 13, and auxiliary inside air. An auxiliary inside air inlet door 17 that opens and closes the inlet 14 and a blower 11 including a blower fan 18 and a blower motor 19 are provided. The auxiliary inside air introduction port 14 is formed as an opening having a smaller area than the inside air introduction port 13.

  The casing 15 is formed by joining an upper case 151 and a lower case 152 made of a plastic material, and includes a substantially rectangular parallelepiped body portion 153 having a bottom surface 153b inclined slightly downward to the right from the horizontal, and the upper case 151. The main body portion upper surface 153u is formed with an outside air introduction duct portion 154 protruding upward from the periphery of the outside air introduction port 12 and a protrusion portion 155 protruding leftward from the left end portion of the main body portion 153. The blower fan 18 of the blower 11 is disposed at the right end of the main body 153 of the casing 15 with the suction port 18a facing the auxiliary internal air introduction port 14, and as a result, the blower suction direction is indicated by an arrow A in the figure. It is determined so that the horizontal right direction. A rectangular inside air inlet 13 shown by a broken line in FIG. 1 is formed on the side surface 153s of the main body 153 formed by the upper and lower cases 151 and 152 by being covered by the inside / outside air switching door 16 in FIG. A rectangular auxiliary inside air introduction port 14 is formed on the left end surface 155 s of the protrusion 155 formed by the lower case 152, and the auxiliary inside air introduction door is located inside the protrusion 155 above the auxiliary inside air introduction port 14. 17 is held pivotably and is shown in FIG. 1 at an opening angle of about 60 degrees. The end surface 155s of the protrusion is a substantially vertical surface inclined about 5 degrees from the vertical, and the edge of the outside air inlet 12 and the center of the auxiliary inside air inlet 14 are separated by a distance d. Moreover, the dimension of the level | step difference of the bottom face 153b of a main-body part and the bottom face 155b of the protrusion part 155 is represented by h.

  The inside / outside air switching door 16 is of a plate door type, and is provided on the casing 15 substantially parallel to the blower suction direction A and is driven by a motor or the like (not shown) around a pivot 23 schematically represented by a one-dot chain line. The inside air introduction port 13 is closed in the outside air introduction mode, and the outside air introduction port 12 is closed in the inside air circulation mode.

  In this embodiment, the auxiliary inside air introduction door 17 is made of an elastic plate such as rubber, and is configured to rotate around the upper part to open and close the auxiliary inside air introduction opening 14. FIG. 2 is an exploded perspective view showing a part of the lower case 152 including the casing protrusion 155 and the auxiliary inside air inlet door 17, and FIG. 3 is an enlarged longitudinal sectional view mainly showing the casing protrusion 155. It is a longitudinal sectional view passing through a claw-like protrusion 156 described later. As shown in FIG. 2, two claw-shaped protrusions 156 that protrude substantially vertically upward are formed integrally with the lower case 152 on the inner surface of the upper portion of the auxiliary inside air inlet 14 of the lower case 152. On the other hand, two horizontally long support holes 171 through which the two claw-shaped protrusions 156 can be inserted are formed in the upper portion of the auxiliary inside air inlet door 17. As shown in FIG. 3, the auxiliary internal air inlet door 17 is hooked on the lower case 152 by inserting the claw-shaped protrusions 156 into the two support holes 171. When the blower is not operated, the auxiliary internal air inlet door 17 hangs down by its own weight. The auxiliary inside air inlet 14 is closed. Further, since the auxiliary inside air inlet door 17 is formed of a rubber-like elastic body in this embodiment, when negative pressure is generated in the casing 15, the auxiliary inside air inlet door 17 is rotated counterclockwise by being bent near its upper end. Then, the auxiliary inside air inlet 14 is opened. Even when the auxiliary inside air introduction door 17 is formed of a normal plastic material or metal, the auxiliary inside air introduction door 17 can be rotated around the support hole 171 as a fulcrum. This is possible by appropriately determining the size around the protrusion 156. Further, the upper case 151 is provided with one door stopper 157 at the center that protrudes downwardly from the inner surface thereof in a U-shape. The door stopper 157 is for determining the maximum opening position of the auxiliary inside air inlet door 17.

  Next, the operation of the blower unit 10 of the vehicle air conditioner according to the embodiment of the present invention will be described. When the outside air introduction mode is selected by the vehicle air conditioner, the inside / outside air switching door 16 of the blower unit 10 operates so as to close the inside air introduction port 13, thereby opening the outside air introduction port 12. When the blower 11 is operated, a negative pressure is formed in the casing 15 and outside air is introduced from the outside air inlet 12 as indicated by an arrow B in FIG. 1, while the auxiliary inside air inlet is based on the negative pressure. The door 17 rotates upward until it abuts against the door stopper 157 to open the auxiliary inside air introduction port 14 from which the inside air is introduced as shown by the arrow C. As a result, a relatively small amount of outside air is introduced into the vehicle interior. Inside air is supplied. When the blower 11 is stopped, the auxiliary inside air introduction door 17 rotates downward based on its own weight to close the auxiliary inside air introduction opening 14.

  Next, when the vehicle air conditioner is selected in the inside air circulation mode, the inside / outside air switching door 16 of the blower unit 10 operates so as to close the outside air introduction port 12, and as a result, the inside air introduction port 13 is opened. By operating the blower 11, a negative pressure is formed in the casing 15 and the inside air is introduced from the inside air introduction port 13, while the inside air is also introduced from the auxiliary inside air introduction port 14 as in the outside air introduction mode. Thus, the inside air is circulated and supplied into the passenger compartment.

  In the embodiment of the present invention, the auxiliary internal air introduction port 14 is arranged at a distance d upstream from the edge of the external air introduction port 12 in the protruding portion 155 of the casing 15, so that the auxiliary internal air introduction door 17 is connected to the outside air introduction port 17. The auxiliary inside air introduction port 14 can be opened without receiving the dynamic pressure of the air flow flowing in from the port 12. Further, when water enters the casing 15 from the outside air inlet 12, the intruded water leaks into the vehicle through the inside air inlet 13 that is spaced apart from the outside air inlet 12 as described above and arranged substantially vertically. There is no.

  In the above-described embodiment, the auxiliary inside air introduction port 14 is formed on a substantially vertical surface. However, in the present invention, the direction of the surface on which the auxiliary inside air introduction port 14 is formed is not limited to the vertical direction. If a negative pressure that overcomes the rotational force in the closing direction based on the weight of the auxiliary inside air inlet door 17 is formed in the casing 15, it may be formed on a horizontal plane, for example.

It is a longitudinal cross-sectional view of the air blower unit of the vehicle air conditioner by embodiment of this invention. It is a disassembled perspective view which shows the lower case and auxiliary | assistant internal air inlet door in the protrusion part of the casing of the said air blower unit. It is an enlarged vertical sectional view of the vicinity of the auxiliary inside air introduction port of the protrusion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Blower unit of vehicle air conditioner 11 Blower 12 Outside air introduction port 13 Inside air introduction port 14 Auxiliary inside air introduction port 15 Casing 16 Inside / outside air switching door 17 Auxiliary inside air introduction door 153 Main body portion 155 Projection portion 155s End surface of projection portion

Claims (6)

A casing (15) in which the outside air introduction port (12), the inside air introduction port (13) and the auxiliary inside air introduction port (14) are formed in different parts, respectively;
An inside / outside air switching door (16) for opening and closing the outside air introduction port (12) and the inside air introduction port (13);
A blower (11) for sucking air from the outside air introduction port (12), the inside air introduction port (13) and the auxiliary inside air introduction port (14);
An auxiliary internal air introduction door (17) for opening and closing the auxiliary internal air introduction port (14), which opens to the casing (15) so as to be opened by the negative pressure generated in the casing (15) by the blower (11). In the air blower unit of the vehicle air conditioner comprising the auxiliary indoor air inlet door (17) pivoted,
The auxiliary internal air introduction port (14) so that the dynamic pressure of the airflow flowing from the outside air introduction port (12) to the blower (11) does not act on the auxiliary internal air introduction door (17) opened by the negative pressure. And the auxiliary inside air inlet door (17) is disposed in the casing (15) ,
The auxiliary inside air introduction port (14) is formed on the side surface of the casing (15) facing the suction port (18a) of the blower (11), and the inside air introduction port (13) and the outside air introduction port (12). Is formed on the side surface of the casing (15) substantially parallel to the suction direction (A) of the blower (11) .   The auxiliary inside air introduction port (14) is a position opened by the operation of the blower (11) even when the outside air introduction port (12) is closed, and is more than the outside air introduction port (12). The blower unit of the vehicle air conditioner according to claim 1, wherein the blower unit is disposed at a position far from the blower (11), that is, at an upstream position. The casing (15) has a side surface (155s) substantially perpendicular to the suction direction (A) of the blower (11),
The blower unit of a vehicle air conditioner according to claim 1 or 2, wherein the auxiliary internal air introduction port (14) is formed on the substantially vertical side surface (155s) of the casing (15). The casing (15) has a main body (153) and a protrusion (155) protruding from the main body (153) in a direction opposite to the suction direction (A) of the blower (11),
The protrusion (155) has an end face (155s) facing the blower (11), and the end face (155s) constitutes the substantially vertical side face (155s). 4. A blower unit of a vehicle air conditioner according to 3.   The blower unit of the vehicle air conditioner according to claim 3 or 4, wherein the substantially vertical side surface (155s) of the casing (15) extends substantially vertically. The casing (15) includes a protrusion (156) protruding from the inner surface of the casing (15),
The auxiliary inside air inlet door (17) includes a support hole (171) for receiving the protrusion (156),
The said auxiliary inside air introduction door (17) is supported by the said projection part (156) in the said support hole (171), and rotates, It is characterized by the above-mentioned. Blower unit for vehicle air conditioner.

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