JPH0134784Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) This invention relates to a direction change backflow prevention device, and more particularly to an improvement of a direction change backflow prevention device used for gases such as air.

(Background of the invention) The present inventors previously proposed a direction change backflow prevention device having the structure shown in FIG. This direction change backflow prevention device is composed of a main body 1, a backflow prevention membrane 2 made of rubber or synthetic resin elastic material having a wedge-shaped opening/closing valve 2b with a dividing line 2a formed at the tip, a direction changer 3, and a lid body 4. When the gas flows in from the vent A of the main body as shown in FIG. For gas flowing in from the opening/closing valve 2b, the gas is allowed to flow into the lid body 4 through the hole 3b of the direction changer 3, and is further discharged to the outside through the vent c of the lid body.
The opening and closing of the on-off valve 2b was performed by the pressure of gas flowing in from the outside. However, when gas flows in as shown in Figure 3, if the pressure of the gas is too high, the deformation of the on-off valve 2b may be too large or local deformation may occur, resulting in complete failure. It may not be possible to seal it tightly,
Furthermore, if the gas pressure is too low, the sealing may be incomplete, making it impossible to completely change direction and prevent backflow.

(Purpose of the invention) This invention was made in view of the above points,
An object of the present invention is to provide a direction change backflow prevention device that can more completely change the direction of gas and prevent backflow regardless of the pressure of incoming gas.

(Structure of the invention) FIG. 4 is an exploded view of one embodiment of the direction change backflow prevention device according to the invention, and FIG. 5 is a longitudinal cross-sectional view of the assembled state.

As shown in the figure, the direction change backflow prevention device according to the invention is composed of a main body 5, a backflow prevention membrane support 6, a backflow prevention membrane 7, a direction changer 8, and a lid 9, the shapes of which are as follows.

The main body 5 is made of synthetic resin, has a cylindrical part 10 communicating with the outside at the side, and has a container shape with an opening at the upper part 11, and has a threaded part 12 and an annular support protruding inward at the upper part of the inner peripheral surface. It has a section 13.

The backflow prevention membrane support 6 is made of synthetic resin, has a plurality of holes 14 in the center and a plurality of engagement protrusions 15 around the periphery, and is placed on the annular support portion 13 of the main body 5 and connected to the upper part 11 of the main body 5. It consists of plate-shaped bodies that fit together.

The backflow prevention membrane 7 is made of elastic rubber or synthetic resin, has a brim, and resembles a cap shape with a concave center, and has dividing lines 16 radially extending from the center. a plurality of on-off valves 1 corresponding to the holes 14 of the backflow prevention membrane support;
It is divided into 7 parts, and has an engaging recess 18 around the bottom that engages with the engaging protrusion 15 of the backflow prevention membrane support. The engagement recess 18 is formed so that, when engaged with the engagement protrusion 15, the on-off valve 17 of the backflow prevention membrane and the hole 14 of the backflow prevention membrane support are aligned.

The direction changer 8 is made of synthetic resin, and has an annular body 20 formed around a cylindrical part 19 , a plurality of holes 21 and a threaded part 22 are formed in the annular body 20 , and the cylindrical part 19 is formed from a circular body 20 . Lower part 19a protruding downward
and an upper part 19b protruding above the annular body 20, a plurality of ribs 23 are formed between the outer peripheral surface of the lower part 19a and the back surface of the annular body 20, and the upper part 19b
An annularly protruding sealing portion 24 is formed at the base of the holder.

The lid 9 is made of synthetic resin and has a cylindrical portion 25 on the side that communicates with the outside, and an opening 26 at the top. The diameter of the opening 26 is large enough to allow insertion of the cylindrical portion 19 of the direction changer, and the end of the opening 26 has an annular projection 27 that projects toward the main body.

Next, the assembly of the direction change backflow prevention device made of the above-mentioned components will be explained.

(a) Attaching the backflow prevention membrane support 6 into the main body 5 The backflow prevention membrane support 6 is placed on the annular support part 13 formed inside the main body 5, and the backflow prevention membrane support 6 is installed inside the main body 5. Attach 6.

(B) Attaching the backflow prevention membrane 7 to the main body 5 The backflow prevention membrane 7 is placed on the backflow prevention membrane support 6 with the engagement protrusion 15 and the engagement recess 18 engaged. At this time, an on-off valve 17 formed in the anti-reflux membrane 7 is located directly above the hole 14 formed in the anti-reflux membrane support 6 .

(c) Attaching the direction changer 8 to the main body 5 The direction changer 8 is screwed to the upper part of the main body 5, and the direction changer 8 is thereby attached to the main body 5.
At this time, the collar-shaped portion 28 of the backflow prevention membrane 7 is tightened by the backflow prevention membrane support 6 and the direction changer 8, and the backflow prevention membrane 7 and the main body 5 are sealed at that portion.

(d) Attaching the lid 9 to the main body 5 The upper part 19b of the cylindrical portion of the direction changer 8 is fitted into the opening 26 of the lid 9, and the lid 9 is attached to the main body 5. Then, at this attachment part, that is, the contact part between the main body 5 and the lid 9, the main body 5 and the lid 9
is sealed by mere adhesion, adhesion, or welding. In addition, the lid 9 and the direction changer 8 are arranged so that the annular protrusion 27 of the lid 9 and the sealing part 24 of the direction changer 8 are in close contact with each other.
This close contact area is sealed. Therefore, the space a surrounded by the upper surface of the direction changer 8 and the surface of the lid 9 communicates with the outside only through the cylindrical portion 25 of the lid 9. Note that the lid 9 and the direction changer 8 are not sealed tightly by the annular protrusion 27 and the sealing part 24, but the opening 26 of the lid 9 is connected to the upper part 19b of the cylindrical part of the direction changer 8. It is also possible to do it in close contact with the outer wall.

The operation of the direction change backflow prevention device having the above structure will be explained below.

(a) Outward path (Fig. 6) Gas flowing into the main body 5 from the cylindrical portion 10 of the main body 5 passes through the path as shown by the arrow and passes through the hole 14 of the backflow prevention membrane support 6, and then passes through the backflow prevention membrane 7. The on-off valves 17 are pushed up to form a gap b between each on-off valve 17, through which the flow flows into the cylindrical part 19 of the direction changer 8, and then the upper part 1 of the cylindrical part 19 flows into the cylindrical part 19 of the direction changer 8.
It flows out from 9b. At this time, the backflow prevention membrane 7 is supported by the lower part 19a of the cylindrical portion of the direction changer 8 and the ribs 23, thereby resisting the gas pressure from the main body side, and therefore the backflow prevention membrane 7 ensures smooth flow of gas without significant deformation.

(b) Return path (Fig. 7) The gas flowing in from the cylindrical part 19 of the direction changer 8 presses the center part of the backflow prevention membrane 7 and closes the on-off valve 1.
7 is brought into close contact with the periphery of the hole 14 of the backflow prevention membrane support 6, thereby making the hole 14 of the backflow prevention membrane support 6
After that, it follows the path as shown by the arrow, passes through the hole 21 of the direction changer 8, and flows into the lid body 9.
It flows out from the cylindrical portion 25. Since the backflow prevention membrane 7 is shaped like a mortar as described above, the gas flowing in from the cylindrical part 19 of the direction changer tends to concentrate in the center of the backflow prevention membrane 7, and therefore backflow is prevented in this part. The membrane 7 is strongly pressed, and as a result, the on-off valve 17 comes into close contact with the periphery of the hole 14 of the backflow prevention membrane support 6. The above-mentioned pot shape, ease of deformation due to the opening/closing valve 17 being formed by inserting a score line in the backflow prevention membrane 7, and the flat surface around the hole 14 of the backflow prevention membrane support ,
Even a small amount of inflowing gas will reliably close the holes 14 of the backflow prevention membrane support. In addition, even if a large amount of gas enters and the backflow prevention membrane 7 is strongly pressed, the contact surface between the on-off valve 17 and the backflow prevention membrane support 6 is flat, so irregular deformation and close contact will not occur. There is no gap between the on-off valve 17 and the periphery of the hole 14 of the backflow prevention membrane support, and no gas leaks.

(Effect of the invention) Since the direction change backflow prevention device according to this invention has the above-mentioned structure, it is not affected by the amount of inflowing gas or the pressure of the gas, and can achieve more complete direction change and backflow prevention. This can be made possible and is useful in practice.

[Brief explanation of the drawing]

Figures 1 to 3 relate to the conventional product, Figure 1 is an exploded perspective view, Figures 2 and 3 are longitudinal sectional views to explain the operation, and Figures 4 to 7 are one embodiment of this invention. Regarding the direction change backflow prevention device, FIG. 4 is an exploded perspective view, FIG. 5 is a longitudinal sectional view of the assembled state, and FIGS. 6 and 7 are longitudinal sectional views illustrating the operation. 5...Main body, 6...Backflow prevention membrane support, 7...
Backflow prevention membrane, 8... Direction changer, 9... Lid body, 1
0... cylinder part, 14... hole, 16... dividing line, 17...
...Opening/closing valve, 19... Cylindrical part, 20... Annular body, 21
... Hole, 25 ... Cylindrical portion, 26 ... Opening.

Claims (1)

[Scope of claims for utility model registration] Main body 5, backflow prevention membrane support 6, backflow prevention membrane 7,
It consists of a direction changer 8 and a lid body 9, (a) the main body 5 has a cylindrical part 10 that communicates with the outside,
(b) The backflow prevention membrane support 6 is a plate-shaped body having a plurality of holes 14 and fitted with the upper part of the main body 5; (c) Backflow prevention The membrane 7 is made of elastic rubber or synthetic resin, has a brim, and resembles a cap shape with a concave central part, and has dividing lines 16 radially extending from the center to define the central part. is divided into a plurality of on-off valves 17 corresponding to the holes 14 of the backflow prevention membrane support; (d) the direction changer 8 forms an annular body 20 around a cylindrical portion 19 with both ends open; This annular body 20 is made up of a plurality of holes 21, (e) the lid body 9 has a cylindrical part 25 that communicates with the outside,
The backflow prevention membrane support 6 is fixed to the upper part of the main body 5, and the backflow prevention membrane 7 is mounted on the backflow prevention membrane support 6 with holes 14 and opening/closing valves. 17, the direction changer 8 is installed covering the backflow prevention membrane 7, the opening 26 of the lid body and the cylindrical part 19 of the direction changer are aligned, and the lid A direction change backflow prevention device in which a lid body 9 is attached with a space communicating with the outside via a cylindrical portion 25 of the lid body between the inner surface around the opening 26 of the body and the upper surface of the direction changer 8.