JP2020045010A - Vehicle air conditioning unit - Google Patents

Abstract

In a vehicle air conditioning unit including a rotary damper, vibration of an elastomer portion is prevented when the rotary damper has a small opening degree.
An air conditioning unit for a vehicle including a fan-shaped rotary damper, wherein the rotary damper has a fan-shaped base portion (2b) viewed from a direction along a rotation axis and a circumferential direction centered on the rotation axis. An elastomer portion 2c provided at an end portion of the base portion 2b and a rib 2d protrudingly provided at an end portion of the elastomer portion 2c opposite to the base portion 2b in a circumferential direction around the rotation axis. Have.
[Selection diagram] Fig. 1

Description

  The present invention relates to a vehicle air conditioning unit.

  The vehicle air-conditioning unit supplies conditioned air whose temperature and the like have been adjusted into the vehicle interior. This vehicle air-conditioning unit includes an air-conditioning unit that adjusts the temperature of air and the like, and a blowing unit that supplies air to the air-conditioning unit. Patent Literature 1 below discloses an inside / outside air switching device mounted on a blower unit that switches between inside air and outside air using a rotary damper. This inside / outside air switching device switches between inside air and outside air by selectively closing / opening the outside air inlet and the inside air inlet using a rotary door that rotates around a predetermined rotation axis. Installed in the box and supplied to the car. As described above, the vehicle air conditioning unit may be provided with the rotary damper for adjusting the air flow.

JP-A-11-192831

  The rotary damper as described above has a fan-shaped base member as viewed from a direction along the rotation axis. Also, if necessary, in order to improve the shielding property in the gap between the rotary damper and the inner wall surface of the case, a flexible flange is provided on an end of the base in the circumferential direction around the rotation axis. Has an elastomer section.

  However, when the rotary damper is minutely opened, the velocity of the air flowing into the base material from the outside is high, and the pressure in the vicinity of the elastomer portion is not stabilized, which may cause the elastomer portion to vibrate. is there. When the elastomer portion vibrates in this manner, a vibration sound is generated, which causes abnormal noise.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to prevent a vibration of an elastomer portion when a rotary damper has a small opening degree in a vehicle air conditioning unit including a rotary damper.

  The present invention provides a vehicle air conditioning unit including a fan-shaped rotary damper as a means for solving the above-described problem, wherein the rotary damper has a fan-shaped base member viewed from a direction along a rotation axis, and An elastomer portion provided at an end of the base material portion in a circumferential direction about the axis, and an elastomer portion provided at an end opposite to the base material portion of the elastomer portion in a circumferential direction about the rotation axis. And a rib provided to protrude so as to surround the air opening provided in the portion.

  According to the present invention, the elastomer portion is provided at the end of the base portion, and the rib is provided so as to protrude from the elastomer portion. For this reason, when the rotary damper has a minute opening, the flow of air near the elastomer portion can be slowed down by the air flow being hindered by the rib, and the pressure fluctuation near the elastomer portion can be suppressed. Therefore, according to the present invention, it is possible to prevent the elastomer portion from vibrating, and to prevent generation of abnormal noise.

It is a principal part sectional view of the inside and outside air switching unit with which the air-conditioning unit for vehicles in one embodiment of the present invention is provided. It is a principal part enlarged view which shows the modification of the inside / outside air switching unit with which the air conditioning unit for vehicles in one Embodiment of this invention is provided.

  Hereinafter, an embodiment of a vehicle air conditioning unit according to the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a main part of an inside / outside air switching unit A included in the vehicle air conditioning unit of the present embodiment. As shown in this figure, the inside / outside air switching unit A includes a main body casing 1, an inside / outside air switching damper 2 (rotary damper), and a filter 3. Although not shown, a fan casing containing a blower fan is provided at a lower portion of the main body casing 1. Such an inside / outside air switching unit A is provided as a part of a blower unit arranged in a part on a passenger seat side below an instrument panel in a front part of a vehicle compartment of an automobile, and supplies air supplied to an air conditioning unit to the outside air. It is a device that switches between the inside and the inside.

  The main casing 1 is a resin molded body and includes an inside air inlet 1a, an outside air inlet 1b, and a damper shut rib 1c. The inside air introduction port 1 a is an opening for introducing vehicle interior air (inside air), and is provided at an upper portion of the main body casing 1. The outside air inlet 1b is an opening for introducing outside air, and is arranged above the main body casing 1 adjacent to the inside air inlet 1a.

  The damper shut rib 1c is a portion where the inside / outside air switching damper 2 is brought into contact when closing the inside air introduction port 1a, and is provided in a substantially horizontal posture near a lower portion of the inside air introduction port 1a. It is provided to protrude in the direction. The damper shut rib 1c is disposed adjacent to the opposite side of the outside air inlet 1b, and functions as a stopper that regulates a rotation range of the inside / outside air switching damper 2 toward the outside air inlet 1b.

  The inside / outside air switching damper 2 is a resin molded body like the main body casing 1, and has a shape obtained by cutting a bottomed cylinder body whose both ends are closed by a predetermined angle range (less than 90 ° as shown) around the central axis. Have been. The inside / outside air switching damper 2 is rotated around a rotation axis provided in a direction perpendicular to the plane of FIG. 1 to selectively open and close the inside air inlet 1a and the outside air inlet 1b. The door. The inside / outside air switching damper 2 is rotatably supported by the main body casing 1 by the shaft portion 2a being rotatably engaged with a rotation support portion formed on the main body casing 1.

  The inside / outside air switching damper 2 includes a fan-shaped base portion 2b viewed from a direction along the rotation axis, and an elastomer portion 2c provided at an end of the base portion 2b in a circumferential direction around the rotation axis. And a rib 2d protrudingly provided at an end of the elastomer portion 2c on the side opposite to the base portion 2b in the circumferential direction around the rotation axis.

  The inside of the base member 2 b is hollow, and guides the inside air flowing from the inside air inlet 1 a or the outside air flowing from the outside air inlet 1 b toward the filter 3. The elastomer part 2c is provided along the edge of the base part 2b, and is provided so as to project from the edge of the base part 2b toward the outside of the base part 2b. The elastomer portion 2c is flexible, and seals the gap between the inside / outside air switching damper 2 and the damper shut rib 1c by being pressed against the damper shut rib 1c.

  The rib 2d is disposed closer to the shaft portion 2a than the elastomer portion 2c so as not to interfere with the damper shut rib 1c when the elastomer portion 2c contacts the damper shut rib 1c. For this reason, when the elastomer portion 2c is in contact with the damper shut rib 1c or when the elastomer portion 2c is arranged close to the damper shut rib 1c, the rib 2d is located at a position opposite to the tip of the damper shut rib 1c. They are arranged facing each other with a slight gap.

  The filter 3 is provided at the bottom of the main casing 1 and removes dust contained in outside air or inside air. The filter 3 is made of, for example, corrugated filter paper or porous urethane foam.

  In the inside / outside air switching unit A configured as described above, when the inside / outside air switching damper 2 closes the inside air inlet 1a by an actuator (not shown), the air inside the vehicle flows into the inside of the main body casing 1 from the inside air inlet 1a. As a result, the inside air is supplied to the air conditioning unit via the filter 3.

  On the other hand, in the inside / outside air switching unit A configured as described above, when the inside / outside air switching damper 2 closes the inside air inlet 1a by an actuator (not shown), the air outside the vehicle enters the inside of the main body casing 1 from the inside air inlet 1a. Flow in. As a result, outside air is supplied to the air conditioning unit via the filter 3.

  At the time of cooling / heating use, the inside air inlet 1a may be slightly opened so that a part of the inside air can be taken in, even from the outside air introduction mode, from the viewpoint of energy efficiency and the like. In such a case, the posture of the inside / outside air switching damper 2 is maintained so that a slight gap is formed between the elastomer portion 2c and the damper shut rib 1c.

  At this time, since the gap between the elastomer portion 2c and the damper shut rib 1c is small, the inside air tends to increase the speed and pass through the gap between the elastomer portion 2c and the damper shut rib 1c. Here, in the present embodiment, since the ribs 2d are provided, the air flow trying to pass through the gap between the elastomer portion 2c and the damper shut rib 1c is obstructed by the ribs 2d, and the flow velocity decreases.

  Thus, according to the vehicle air conditioning unit of the present embodiment, the elastomer portion 2c is provided at the end of the base portion 2b, and the rib 2d is provided so as to protrude from the elastomer portion 2c. Therefore, when the inside / outside air switching damper 2 has a minute opening, the flow of air near the elastomer portion 2c can be slowed down by the air flow being hindered by the rib 2d, and the pressure fluctuation near the elastomer portion 2c can be suppressed. can do. Therefore, according to the vehicle air-conditioning unit of the present embodiment, it is possible to prevent the elastomer portion 2c from vibrating, and to prevent generation of abnormal noise.

  As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to the above embodiments. The shapes, combinations, and the like of the respective constituent members shown in the above-described embodiments are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

  FIG. 2 is an enlarged view including the vicinity of the rib 2d. As shown in this figure, a reinforcing rib 2e projecting radially outward of the inside / outside air switching damper 2 from the end of the rib 2d may be provided. By adopting such a configuration, it is possible to reinforce the rib 2d without changing the outer shape and basic settings of the elastomer portion 2c.

  Further, the rotary damper in the present invention is not limited to the inside / outside air switching damper 2 but may be another rotary damper such as an air mix damper.

  DESCRIPTION OF SYMBOLS 1 ... Body casing, 1a ... Inside air introduction port, 1b ... Outside air introduction port, 1c ... Damper shut rib, 2 ... Inside / outside air switching damper (rotary damper), 2a ... Shaft part, 2b ... Base material Part, 2c ... elastomer part, 2d ... rib, 2e ... reinforcing rib, 3 ... filter, A ... inside / outside air switching unit

Claims (1)

An air conditioning unit for a vehicle including a fan-shaped rotary damper,
The rotary damper is
A fan-shaped base member viewed from a direction along the rotation axis,
An elastomer portion provided at the end of the base portion in the circumferential direction around the rotation axis,
An air conditioning unit for a vehicle, comprising: a rib protruding from an end of the elastomer portion in a circumferential direction about the rotation axis, the end being opposite to the base portion.

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