JPH0644723Y2 - Air flow backflow prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to an air flow backflow prevention device in which the structure of the fixed portion of the backflow prevention valve is improved.

(Prior Art) Generally, a vehicle such as an automobile has a structure in which a backflow prevention device for airflow shown in FIG. 3 is attached to an air blowout portion of a ventilation device for discharging air in the vehicle interior to the outside. Has been done. In FIG. 3, 1 is a blower duct, 2 is an air intake side opening of the blower duct 1, and 3 is an air outlet of the blower duct 1. Further, a stepped valve holding member 4 shown in FIG. 4 is attached to the air suction side opening 2 of the blower duct 1. The valve holding member 4 connects a pair of valve holding portions 5 and 6 vertically arranged substantially parallel to each other and a lower end portion of the upper-stage valve holding portion 5 and an upper end portion of the lower-stage valve holding portion 6. Connecting part 7
Are provided respectively. Furthermore, this valve holding member 4
Air inlets 8 ... Are formed in the upper stage valve holding part 5 and the lower stage valve holding part 6, respectively. As shown in FIG. 5, check valves 9 and 10 made of an elastic material such as rubber are provided on the inner surfaces of the valve holding portions 5 and 6 of the respective stages of the valve holding member 4. . In this case, the upper end of the upper check valve 9 is fixed to the upper end side of the air suction port 8 of the upper valve holding part 5, and the upper end of the lower check valve 10 is lower valve. Air suction port 8 of holding part 6
It is fixed to the upper end of. Then, for example, the air discharged from the vehicle compartment due to the driving of the blower fan (not shown) is blown from the outside of the valve holding member 4 through the air inlets 8 into the blower duct 1 as shown by the arrow in FIG. In the case of a normal air flow that flows into the side, the free end side of the check valves 9 and 10 opens inward by the wind pressure of this air flow, and the air ducts 1 of the blower duct 1 are opened through the respective air suction ports 8. The airflow flowing into the inside is exhausted from the air outlet 3 to the outside through the air duct 1. Further, when the air flow backflows in the blower duct 1, the free pressure side of the backflow prevention valves 9 and 10 is held by the wind pressure of the backflowing airflow to hold the upper side valve holding part 5 and the lower side valve holding part 5 of the valve holding member 4. The air suction ports 8 are closed by being pressed against the parts 6, respectively, and the air flow that flows backward in the blower duct 1 is prevented from being blown out toward the vehicle interior through the air suction ports 8. ing.

By the way, in the conventional structure, the valve holding member 4 is provided with a substantially L-shaped constituent member 11 in which the upper-stage valve holding portion 5 and the connecting portion 7 are integrally formed of a plastic material such as polypropylene. The upper end of the lower valve holding portion 6 of another component made of a plastic material is fixed to the front end of the connecting portion 7 of the L-shaped component 11 by means such as adhesion or welding. Further, a plurality of support protrusions 12 for supporting the fixed ends of the check valves 9, 10 are provided at the upper end of the upper valve holding portion 5 and the upper end of the lower valve holding portion 6 of the L-shaped component 11, respectively. , 13 ... are provided. When the upper backflow prevention valve 9 is attached, the support projections 12 of the upper valve holding portion 5 are inserted into the insertion holes 9a on the fixed end side of the backflow prevention valve 9 while the support projections 12 ... The tip portion is crushed by means such as caulking, or fixed by means such as rivet fixing.
Further, at the time of mounting the lower check valve 10 on the lower side, before fixing the upper end of the lower valve holding portion 6 to the L-shaped component 11, the respective support projections 13 ... It is inserted into the insertion hole 10a on the side of the fixed end of 10 and, in this state, the upper end of the lower valve holding portion 6 is fixed to the L-shaped component 11, so that the front end of the L-shaped component 11 The fixed end portion side of the check valve 10 is sandwiched between the upper end portion of the lower stage side valve holding portion 6.

However, in the above-mentioned conventional structure, the L-shaped component member 11 and the lower stage side valve holding portion 6 are formed by separate parts, and therefore, when manufacturing the valve holding member 4, they are bonded or welded. However, there is a problem in that the complicated work is required for joining and the cost increases. Further, at the time of welding work between the L-shaped component member 11 of the valve holding member 4 and the lower stage side valve holding part 6 or when attaching the upper side check valve 9, the tips of the respective support projections 12 of the upper side valve holding part 5 ... There was a risk that toxic gas would be emitted from the plastic material during the work of calcining the part. Further, there is a possibility that the lower check valve 10 on the lower side may come off from the respective support projections 13 of the lower valve holding portion 6.

(Problems to be Solved by the Invention) In the conventional structure, the L-shaped component member 11 and the lower-stage valve holding portion 6 are formed as separate parts, so these are not manufactured when the valve holding member 4 is manufactured. At the time of welding work between the L-shaped component member 11 of the valve holding member 4 and the lower stage side valve holding portion 6, there is a problem that the troublesome work of joining the two by means such as adhesion or welding is required and the cost becomes high. Or the upper check valve 9
When attaching, the toxic gas is generated from the plastic material during the work of burning the tip portion of each support projection 12 of the upper-side valve holding portion 5, and the lower check valve 10 on the lower-side valve holding portion 6 There was a risk that it would come off the support protrusions 13 ...

This invention was made in view of the above circumstances, and can reduce the number of man-hours during manufacturing work, improve work efficiency, reduce cost, and prevent the generation of toxic gas during manufacturing work. Therefore, it is an object of the present invention to provide an airflow backflow prevention device that can improve safety and can reliably prevent the check valve from falling off.

[Structure of the Invention] (Means for Solving the Problems) In this invention, the valve holding member is rotatably connected between the upper end of the lower valve holding portion and the connecting portion via a thin hinge portion. In addition to being integrally molded, there is a support projection that supports the fixed end of the check valve on the upper end side of the air inlet of the valve holding part of each stage, and the blower that faces the upper end of the upper side valve holding part. Recesses for accommodating the tips of the supporting protrusions are provided in the peripheral portion of the air intake side opening of the duct and the facing portion of the connecting portion that faces the upper end of the lower stage valve holding portion.

(Operation) The valve holding member is rotatably connected between the upper end portion of the lower valve holding portion and the connecting portion via the thin-walled hinge portion to be integrally formed, so that the valve holding member can be separately manufactured. The troublesome work such as gluing or welding the parts is omitted, and the support projection on the upper end side of the air suction port of the upper stage valve holding part is the air suction of the air duct facing the upper end of the upper stage valve holding part. To be accommodated in the recessed portion of the peripheral portion of the side opening, and to accommodate the support protrusion on the upper end side of the lower valve holding portion in the recessed portion of the connecting portion facing the upper end of the lower valve holding portion. Thus, the fixed end portion of the check valve is prevented from falling out of the support protrusion when the valve holding member is attached.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows a schematic structure of a main part of the airflow backflow prevention device shown in FIG. In FIGS. 1 and 2, the same parts as those in FIGS. 3 to 5 are designated by the same reference numerals and the description thereof will be omitted.

That is, the present invention relates to the lower valve holding portion 6 of the valve holding member 4.
Between the upper end of the hinge and the front end of the connecting part 7 is a thin hinge part.
An integrally formed member 22 rotatably connected via 21 is provided, and fixed end portions of the check valves 9 and 10 are provided on the upper end side of the air suction ports 8 of the valve holding portions 5 and 6 of each stage. A plurality of supporting protrusions 23, 24, 24 for supporting are provided, and the supporting protrusions 23 are provided on the side of the facing member (the front end portion of the connecting portion 7 of the blower duct 1 and the valve holding member 4) facing the valve holding portions 5, 6 of each stage. A plurality of recesses 25, 26, for accommodating the tips of the, ... 24 are provided. In this case, the support protrusions 23, 24 of the check valves 9 and 10 are juxtaposed at appropriate intervals along the lateral direction of the valve holding portions 5 and 6 of each stage, and the valve of each stage is The recessed portions 25, 26, on the side of the facing member facing the holding portions 5, 6 are respectively formed at positions corresponding to the installation positions of these support protrusions 23, 24.

Further, the valve holding member 4 has engaging projections on both side edge portions.
4a, 4a (one engaging projection 4a is shown in FIG. 4) are formed, and the lower end portion 4b of the valve holding member 4 has a substantially L shape.
A character-shaped engaging claw 4c is formed. Further, a locking projection 1a (shown in FIG. 3) is formed on the upper end of the air intake side opening 2 of the air duct 1, and both side portions of the air intake side opening 2 of the air duct 1 and Engagement portions that engage with the engagement protrusions 4a, 4a and the engagement claws 4c of the valve holding member 4 are formed at the lower end portion. When the valve holding member 4 is attached to the air suction side opening 2 of the blower duct 1, first, the support projections 23 of the upper stage side valve holding portion 5 of the valve holding member 4 are fixed to the fixed end portion of the check valve 9. Is inserted into the insertion hole 9a on the side, and each of the support protrusions 24 of the lower valve holding portion 6 is ...
Is inserted into the insertion hole 10a on the fixed end side of the check valve 10, and in this state, the lower valve holding portion 6 is bent around the hinge portion 21 from the state shown in FIG. 2 to the state shown in FIG. After that, the engaging protrusions 4a, 4a and the engaging claws 4c of the valve holding member 4 are engaged with the respective engaging portions on both sides and the lower end of the air blowing duct 1, and finally, the engaging protrusions of the air blowing duct 1 are engaged. 1a is engaged with the upper end of the valve holding member 4.

Therefore, in the structure described above, an integrally formed member 22 is provided which is connected via the hinge portion 21 between the upper end portion of the lower stage side valve holding portion 6 of the valve holding member 4 and the front end portion of the connecting portion 7. Therefore, when manufacturing the valve holding member 4, it is possible to omit the conventional troublesome work such as adhering or welding the separate parts (the L-shaped component 11 and the lower stage side valve holding portion 6). Therefore, as compared with the related art, it is possible to reduce the number of man-hours during the manufacturing work of the valve holding member 4 to improve the work efficiency, and to reduce the cost. Furthermore, it is possible to prevent the generation of toxic gas during manufacturing work and improve safety. Further, since the tips of the support protrusions 23, 24 of the check valves 9 and 10 are housed in the recesses 25, 26 of the facing member facing the valve holding portions 5 and 6 of each stage, It is possible to reliably prevent the fixed ends of the check valves 9 and 10 from falling off the support protrusions 23, 24, ... When the valve holding member 4 is mounted.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

[Advantages of the Invention] According to this invention, the valve holding member is integrally formed by rotatably connecting the upper end portion of the lower valve holding portion and the connecting portion via a thin hinge. A support protrusion for supporting the fixed end of the check valve is provided on the upper end side of the air suction port of the stage valve holding part, and the air suction side opening of the air duct facing the upper end of the upper stage valve holding part. Since the concave portion for accommodating the tip of the supporting protrusion is provided at each of the peripheral portion and the facing portion of the connecting portion that faces the upper end portion of the lower valve holding portion, the man-hours during the manufacturing work can be reduced, and the work efficiency can be reduced. And the cost can be reduced, and the production of toxic gas can be prevented during the production work to enhance safety, and the check valve can be reliably prevented from falling off.

[Brief description of drawings]

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a schematic structure of a main part of an air flow backflow prevention device, and FIG. 2 is an assembly of a valve holding member. FIG. 3 is a longitudinal sectional view showing the previous state, FIG. 3 is a perspective view showing the appearance of an air flow backflow prevention device, FIG. 4 is a perspective view showing a valve holding member, and FIG. 5 is a view showing a conventional valve holding member. It is a longitudinal cross-sectional view of a part. DESCRIPTION OF SYMBOLS 1 ... Blower duct (opposing member), 2 ... Air suction side opening part, 4 ... Valve holding member, 5 ... Upper stage valve holding part, 6 ... Lower stage valve holding part, 7 ... Connection part, 8 ... Air suction port, 9, 10 ... Check valve, 21 ... Hinge part, 22 ... Integral molded member, 23, 24 ... Support protrusion, 25, 26 ... Recessed part.

Claims (1)

[Scope of utility model registration request] 1. A stepped structure in which a lower end portion of a pair of upper and lower valve holding portions and an upper end portion of a lower side valve holding portion, which are vertically arranged substantially parallel to each other, are connected via a connecting portion. The valve holding member is attached to the air suction side opening of the blower duct, the air holding ports are formed in the valve holding portions of the respective stages of the valve holding member, and the air of the respective stages on the inner surface side of the valve holding member is formed. In a backflow prevention device for an air flow, in which a fixed end portion of a check valve for opening and closing the air suction port is fixed to an upper end portion side of a suction port, the valve holding member is connected to an upper end portion of a lower stage side valve holding portion. And a fixed end portion of the check valve at the upper end portion side of the air suction port of the valve holding portion of each of the stages is rotatably connected via a thin-walled hinge portion. Providing a support protrusion to support and facing the upper end of the upper valve holding part A concave portion for accommodating the tip portion of the support protrusion is provided at a peripheral portion of the air suction side opening of the blower duct and at an opposing portion of the connecting portion that faces an upper end portion of the lower valve holding portion. Characteristic air flow backflow prevention device.