JPH0794205B2 - Register air flow adjustment mechanism - Google Patents

Description

TECHNICAL FIELD The present invention relates to an air volume adjusting mechanism for adjusting an air volume to a register mounted on an instrument panel or the like of an automobile.

[Prior Art] Conventionally, as this type of air flow rate adjusting mechanism, there is a mechanism including a tubular main body case mounted on the upstream side of a register and a flat plate-like damper rotatably supported in the main body case. . In this air volume adjusting mechanism, by rotating the damper, it is possible to open and close the flow passage in the main body case to adjust the air volume to the register.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technique, when the damper is slightly opened to reduce the air volume to the register, when the air passes through the gap between the inner surface of the main body case and the damper. However, there was a problem that abnormal noise was generated in the gap.

The present invention has been made in view of the above-described circumstances, and an object thereof is to reliably prevent generation of abnormal noise when the damper is rotated to open the flow passage in the main body case. It is to provide a mechanism for adjusting the air flow rate of a register that is capable of

[Means for Solving the Problems] In order to achieve the above object, according to the present invention, a damper for adjusting an air volume to the register is rotated in a flow passage in a cylindrical main body case that is mounted on an upstream side of the register. The flow rate of the register is supported so that the flow passage is closed when the peripheral edge of the damper abuts the inner surface of the main body case, and the flow passage is opened when the damper is rotated from that state. In the mechanism, on the inner surface of the main body case, at a position near the downstream side of the portion where the peripheral edge of the damper abuts when the flow passage is closed, and near the rotational trajectory drawn by the peripheral edge of the damper, The gist of the present invention is an air flow rate adjusting mechanism of a register provided with a protrusion for preventing a straight flow of wind flowing downstream along the inner surface of the main body case.

[Operation] By adopting the above configuration, when the damper is rotated to form a gap between the inner surface of the main body case and the damper, the wind introduced into the air volume adjusting mechanism passes through this gap, and thereafter,
Although it is supplied to the register, the wind that flows through the gap to the downstream side does not flow straight to the register side along the inner surface of the main body case, but impinges on the protrusion provided on the inner surface of the main body case to prevent straight movement. . As a result, it is considered that generation of abnormal noise when passing through the gap is suppressed.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a register 1 mounted on an instrument panel or the like of a vehicle includes a rectangular tubular air duct 2 having open front and rear ends, and a barrel 3 rotatably supported in the air duct 2. And adjusts the direction of the wind W introduced from the rear (the left side in FIG. 1) which is the upstream side,
It is designed to be blown out forward from the blower duct 2.

As shown in FIGS. 1 and 2, an air volume adjusting mechanism 4 for adjusting the flow rate of the air W to the register 1 is attached to the rear portion of the register 1. The air volume adjusting mechanism 4 includes a main body case 5 having a substantially rectangular tube shape with both front and rear end surfaces opened, and a front end portion thereof is connected to a rear end portion of the blower duct 2. Inside the main body case 5 is a flow passage 6 for the wind W. In order to adjust the air flow to the register 1 by opening and closing the flow passage 6, a rectangular plate-shaped damper 7 having substantially the same shape as the opening shape is arranged in the main body case 5. A pair of shafts 8 provided on both left and right sides of 7 are rotatably supported by the main body case 5. The damper 7 can be rotated by operating an operation member (not shown) provided in the register 1.

An annular groove 9 is formed around the entire periphery of the damper 7.
The sponge elastic member 10 is fitted in the annular groove 9. The outer peripheral portion of the elastic member 10 is slightly exposed from the pair of holding portions 11 on both sides of the annular groove 9, and this exposed portion elastically contacts the inner surface of the main body case 5. Therefore, as shown by the solid line in FIG. 1, when the damper 7 is brought into a substantially vertical state, the flow passage 6 is closed and the damper 7 is rotated in the clockwise direction as shown by the chain double-dashed line in FIG. When it is turned to, the flow passage 6 is opened and opened.

FIG. 3 is a partial cross-sectional view showing an enlarged upper half of the main body case 5 and the damper 7. In this figure, the thickness of each sandwiching portion 11 of the damper 7 is T1, the thickness of the elastic member 10 is T2, the length from the center O of the shaft 8 to the upper end of the sandwiching portion 11 is L1, and the center O of the shaft 8 to the elastic member 10 of the elastic member 10. Assuming that the length to the upper end is L2 and the distance from the center O of the shaft 8 to the upper inner surface of the main body case 5 is D1, in this embodiment, T1 = 1 mm, T2 = 2 mm, L1 = 24 mm, L2 = 29 mm, D1 = 27
It is mm.

As shown in FIGS. 1 and 3, when the damper 7 is rotated counterclockwise in the upper inner surface and the lower inner surface of the main body case 5 to be in the closed state, the damper 7 further rotates. A laterally long stopper 12 is integrally formed to prevent the above and lock in the closed state. The upper and lower stoppers 12 are a contact surface 12a perpendicular to the inner surface of the main body case 5 so that the elastic member 10 of the damper 7 abuts, and an inclined surface that gently inclines rearward or forward from the contact surface 12a. It is formed in a triangular shape from 12b, and in this embodiment, the height H of both contact surfaces 12a is set to 2 mm.

Upper stopper 12 on the inner surface of the upper part of the main body case 5
In the vicinity of the downstream side of the above, which is near the rotation locus T drawn by the upper side edge of the damper 7, there are provided protrusions 13 having a rectangular cross section in the left and right directions. From the viewpoint of preventing the generation of abnormal noise, it is preferable to set the distance D2 from the contact surface 12a of the stopper 12 to the rear surface of the protrusion 13 to 10 to 30 mm, and in the present embodiment, this distance D2 is set to 19 mm. Set.

The protrusion 13 is formed by adhering a polyethylene foam band 14 to the inner surface of the main body case 5 with a sponge double-sided tape 15 over the entire width in the left and right direction. In FIGS. 2 and 3, if the front-back width of the protrusion 13 is w1, the height is h, and the left-right length is 1, w1 = 6 mm, h = 2 mm, and l = 90 mm in this embodiment.

Next, the operation and effect of this embodiment configured as described above will be described.

When the damper 7 is in a substantially vertical state and the elastic member 10 is in contact with the contact surfaces 12a of the upper and lower stoppers 12, the flow passage 6 in the main body case 5 is fully closed. Therefore, the wind W introduced into the air volume adjusting mechanism 4 is blocked by the damper 7,
It is not supplied into register 1.

When the damper 7 is slightly rotated in the clockwise direction in FIG. 1 from the above state, a gap G is formed between the elastic member 10 of the damper 7 and the inner surface of the main body case 5, and the damper 7 is introduced into the air volume adjusting mechanism 4. The wind W passes through this gap G and is supplied to the register 1. At this time, unlike the prior art, no abnormal noise is generated in the gap G portion. In this embodiment, this is a position in the vicinity of the downstream side of the upper stopper 12 and is provided with elongated protrusions 13 on the left and right at a portion near the rotation locus T drawn by the upper side edge of the elastic member 10 of the damper 7. Therefore, as described above, the wind W passing through the gap G does not flow straight forward along the inner surface of the main body case 5, but the projection 13 temporarily blocks the flow. As a result, it is considered that generation of abnormal noise when passing through the gap G is suppressed.

In order to confirm this, the air volume W of 120 m ³ / hour is supplied to the air volume adjusting mechanism 4 shown in FIGS. 1 to 3 described above, and the damper 7 in the fully closed state is rotated to make the main body case 5 The flow passage 6 was slightly opened so that the gap G between the inner surface and the damper 7 was 2 mm, and the noise at the A characteristic at this time was measured with a sound level meter (Rion sound level meter "NA-60"). The resulting frequency characteristic is shown in FIG. FIG. 5 shows the measurement result of the air flow rate adjusting mechanism 4 in which the polyethylene foam band 14 is not attached to the inner surface of the upper portion of the main body case 5. In these figures, the horizontal axis represents frequency [Hz] and the vertical axis represents noise [dB]. From these measurement results, in the air volume adjusting mechanism 4 in which the protrusion 13 is not provided, the noise peak is
While the average level of the noise generated at 1250 Hz is as high as 58.2 dB, the peak of the noise is 1600 in this embodiment provided with the protrusion 13.
It can be seen that it occurs at Hz and the average level of the noise has dropped to 40.8 dB.

As described above, according to the present embodiment, no abnormal noise is generated when the damper 7 is rotated to slightly open the flow passage 6 in the main body case 5, so that an unpleasant noise due to ventilation is heard by the occupants of the vehicle. There is no.

Moreover, since the protrusion 14 can be easily formed by attaching the polyethylene foam band 14 to the inner surface of the upper portion of the main body case 5, it is possible to easily add the abnormal noise preventing function to the air volume adjusting mechanism of the conventional configuration. .

Note that the present invention is not limited to the configuration of the above-described embodiment, and may be arbitrarily modified within the scope not departing from the spirit of the invention as follows, for example.

(1) As the protrusion 13, a synthetic resin plate or a rubber plate other than the polyethylene foam band 14 may be used and attached to the inner surface of the main body case 5. In addition, the protrusion 13 is attached to the main body case 5.
It may be integrally formed on the inner surface.

(2) The cross-sectional shape of the protrusion 13 may be changed to a shape other than a quadrangle, such as a semicircle, an ellipse, or a pentagon. At this time, it is preferable that the wind W smoothly flows so that the protrusion 13 cannot be seen from the front of the register 1.

As described above in detail, according to the present invention, when the damper is rotated to open the flow passage in the main body case, the gap formed between the peripheral edge of the damper and the inner surface of the main body case is eliminated. It is possible to reliably prevent abnormal noise from being generated by the wind passing through and going straight to the downstream side so that the user of the register does not hear any unpleasant noise. The portion can be easily provided to the air volume adjusting mechanism having the conventional structure to add the function of preventing abnormal noise.

[Brief description of drawings]

The drawings show an embodiment embodying the present invention. FIG. 1 is a sectional view showing a state in which an air volume adjusting mechanism is mounted on a register, FIG. 2 is a perspective view of the air volume adjusting mechanism, and FIG. Partial sectional views showing the upper half of the damper in an enlarged manner, and FIGS. 4 and 5 are graphs showing the results of measuring the noise level with respect to frequency. 1 ... Register, 5 ... Main body case, 6 ... Flow passage, 7
...... Damper, 12 …… Stopper, 13 …… Projection.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Application Laid-Open No. 61-105211 (JP, A) Japanese Patent Application No. 62-184080 (Japanese Utility Model Publication No. 1-88344) The specification and the drawings attached to the application A microfilm (JP, U) of which the contents were photographed A microfilm (JP, U, U) of the specification and drawings attached to the application for the actual application Sho 62-186564 (Actual Kaihei 1-91835). )

Claims (1)

[Claims] 1. A damper (7) for adjusting an air volume to the register (1) is rotated in a flow passage (6) in a cylindrical main body case (5) mounted on the upstream side of the register (1). When the damper (7) is rotatably supported and the peripheral edge of the damper (7) abuts the inner surface side of the main body case (5), the flow passage (6) is closed and the damper (7) is rotated from that state. In the air flow rate adjusting mechanism of the register that opens the flow passage (6), the peripheral surface of the damper (7) contacts the inner surface of the main body case (5) when the flow passage (6) is closed. The wind (W) flowing straight to the downstream side along the inner surface of the main body case (5) is located in the vicinity of the rotation path (T) drawn by the peripheral edge of the damper (7) near the downstream side of the contacting portion. An air flow rate adjusting mechanism for a register, characterized in that a protrusion (13) for hindering the air flow is provided.