CN107289156A - Device for preventing negative pressure backflow - Google Patents

Abstract

The present invention provides a device for preventing negative pressure backflow, which includes a base, one end of the base is provided with at least one air inlet, the air inlet penetrates the other end of the base, a support portion and a first connecting portion are provided at a predetermined position of the base; a closed body, one end of the closed body is provided with a second connecting portion, the second connecting portion is connected to the first connecting portion to close the other end of the air inlet, the other end of the closed body is provided with an air outlet, the support portion penetrates the air outlet and the air outlet is fitted with the support portion, thereby effectively preventing deformation and preventing negative pressure backflow.

Description

With anti-negative pressure backflow device

technical field

The invention relates to a device for preventing negative pressure backflow, especially a device that can effectively prevent negative pressure backflow through a closed body, and can also effectively support the closed body by means of a support part to prevent deformation of the closed body.

Background technique

Generally, in order to effectively prevent the backflow of gas or liquid, a check valve is often installed at the inlet of the gas or liquid, so as to effectively prevent the backflow of gas or liquid. The head of the reverse valve will be in a triangular shape, and there is an opening at the top of the triangle to effectively prevent the reverse flow. However, if the air return pressure is too high, the return pressure will continue to press the two sides of the opening, which will easily cause deformation The phenomenon of leakage.

Therefore, in view of the above-mentioned shortcoming, existing people on the market now have " HIGH PRESSURES DUCKBILL VALVE AND INSERT (high-pressure duckbill valve and insert) " of U.S. Patent Publication No. US8276616B2, as shown in Figure 1, it comprises a duck Spout body 11, a base 12 and a support body 13, this duckbill body 11 one end is provided with an air outlet 111, and this support body 13 is arranged on this duckbill body 11 inside to support the two sides of this duckbill body 11 inside, In order to effectively strengthen the strength of the duckbill body 11;

However, since the support body only supports two sides inside the duckbill body, the air outlet provided on the duckbill body and part of the duckbill body cannot be effectively and stably supported by the support body.

Contents of the invention

Therefore, in view of this, the present inventor invented a negative pressure backflow prevention device, thereby effectively achieving the effects of preventing deformation and negative pressure backflow, so as to eliminate the shortcomings of existing products and improve their efficacy.

For reaching the above-disclosed purpose, the main technical solutions provided by the present invention include:

A device for preventing negative pressure backflow, which includes a base, one end of the base is provided with at least one air inlet, the air inlet penetrates the other end of the base, a support portion and a the first link; and

A closed body, one end of the closed body is provided with a second connecting part, the second connecting part is connected with the first connecting part to close the other end of the air inlet, the other end of the closed body is provided with an air outlet, and the supporting part passes through The air outlet passes through the air outlet and is attached to the supporting part.

The above-mentioned base, wherein, the base and the sealing body are further installed inside a guiding body, and the gas can be effectively guided to a predetermined position through the guiding body.

The above-mentioned closed body, wherein the closed body has a hollow space inside.

The enclosure as described above, wherein the enclosure comprises a triangle, rectangle or trapezoid.

The above-mentioned base, wherein, the center of the base is provided with the supporting part and the first connecting part.

The base as above, wherein the base comprises a circle, a triangle, a rectangle or a star.

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments are listed below with illustrations.

Description of drawings

Fig. 1 is a sectional view of the prior art.

Fig. 2 is a perspective view of the present invention.

Figure 3 is an exploded view of the present invention.

Fig. 4 is a sectional view of the present invention.

Fig. 5 is an exploded diagram of the use state of the present invention.

Fig. 6 is a schematic diagram of the use state of the present invention.

Fig. 7 is a schematic diagram of the air intake of the present invention.

Fig. 8 is a schematic diagram of preventing backflow in the present invention.

Fig. 9 is a diagram of an embodiment of the present invention.

Fig. 10 is a diagram of an embodiment of the present invention.

[Description of Reference Signs]

11 Duckbill

111 Air outlet

12 base

13 support body

2 pedestals

21 air inlet

22 Support

23 First link

3 closures

31 Second link

32 air outlet

4 guide gas.

detailed description

In order to make it easier for your examiners to understand the content of the present invention and the effects that can be achieved, the specific embodiments are listed in conjunction with the diagrams, and the details are as follows:

Please refer to Figures 2 to 4, which are three-dimensional appearance views, exploded views and cross-sectional views of the present invention. As shown in the figures, the present invention mainly includes a base 2, and at least one air inlet 21 is provided at one end of the base 2. The air inlet 21 penetrates the other end of the base 2, and the center of the base 2 is provided with a support portion 22 and a first connecting portion 23;

A closed body 3, the closed body 3 has a hollow space inside, and one end of the closed body 3 is provided with a second connecting portion 31, and the second connecting portion 31 is connected with the first connecting portion 23 to close the air inlet 21. The other end of the closure body 3 is provided with an air outlet 32 , the support portion 22 penetrates the air outlet 32 and the air outlet 32 fits the support portion 22 .

Please refer to FIG. 5 to FIG. 8 , which are the exploded view of the use state, the schematic view of the use state, the schematic view of the air intake and the schematic view of preventing backflow of the present invention. As shown in the figure, the base 2 and the closing body 3 are installed on a guide body 4 Inside, when the air inlet 21 provided at one end of the base 2 introduces a gas, because the first connecting portion 23 and the second connecting portion 31 are connected to close the other end of the air inlet 21, the gas can only be Lead out from the air outlet 32 provided at the other end of the closed body 3. On the contrary, if the gas wants to enter from the air outlet 32, because the air outlet 32 fits with the support part 13, the gas can only The flow escapes to the outside of the closed body 3, and cannot enter the inside of the closed body 3. Moreover, because the support portion 13 can effectively support the air outlet 32, even if the gas backflow causes negative pressure and squeezes the air outlet 32, The air outlet 32 will not be deformed due to being unable to bear its pressure, so that the effects of preventing deformation and negative pressure backflow can be effectively achieved.

Please refer to FIG. 9 to FIG. 10 , which are diagrams of embodiments of the present invention. As shown in the figures, the present invention can be composed of trapezoidal, square, triangular or other geometric shapes, so as to achieve the same effect as the present invention.

The above is only the best embodiment of the present invention, and should not limit the scope of the present invention; Still belong to the scope that the patent of the present invention covers.

Claims (6)

1. A device for preventing negative pressure backflow, characterized in that it comprises: A base, one end of the base is provided with at least one air inlet, the air inlet penetrates the other end of the base, a support part and a first connecting part are provided at a predetermined position of the base; and A closed body, one end of the closed body is provided with a second connecting part, the second connecting part is connected with the first connecting part to close the other end of the air inlet, the other end of the closed body is provided with an air outlet, and the supporting part passes through The air outlet passes through the air outlet and is attached to the supporting part. 2. The negative pressure backflow preventing device according to claim 1, wherein the base and the sealing body are further installed inside a guiding body, and the gas can be effectively guided to a predetermined position through the guiding body. 3. The negative pressure backflow prevention device as claimed in claim 2, wherein the enclosure has a hollow space inside. 4. The negative pressure backflow preventing device according to claim 3, wherein the closing body comprises a triangle, a rectangle or a trapezoid. 5 . The negative pressure backflow preventing device as claimed in claim 1 , wherein the support portion and the first connecting portion are disposed at the center of the base. 6 . 6. The negative pressure backflow preventing device as claimed in claim 5, wherein the base comprises a circle, triangle, rectangle or star shape.