# US 2018/0320796 A1 · Negative pressure backflow prevention apparatus

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- Number: US 2018/0320796 A1
- Document ID: US20180320796A1
- Status: Published application
- Kind: A1
- Application number: 15/587,383
- Filed: 2017-05-04
- Published: 2018-11-08
- Earliest claimed: 2017-05-04
- Inventors: Ming-Te Hung; Kun-Sheng Huang
- Web page: https://patentgrep.com/patent/US20180320796A1

## CPC

- F16K 15/147: {the closure elements having specially formed slits or being of an elongated easily collapsible form}
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

A negative pressure backflow prevention apparatus includes a base having one end formed of at least one air inlet, a supporting portion and a first connecting portion arranged at predefined locations of the base; the least one air inlet penetrating into another end of the base; and a sealing member having one end formed of a second connecting portion and another end formed of an air outlet; and the second connecting portion and the first connecting portion connected to each other in order to seal another end of the air inlet; the supporting portion penetrating through the air outlet and attached onto the air outlet and the supporting portion. Accordingly, the negative pressure backflow prevention apparatus of the present invention is able to achieve the effects of preventing deformations of the apparatus and preventing negative backflows.

## Claims

### Claim 1

A negative pressure backflow prevention apparatus, comprising:
a base having one end formed of at least one air inlet, a supporting portion having a proximal end mounted to the base and extending from the base in a given direction to define an opposite distal end, and a first connecting portion arranged at predefined locations of the base; the at least one air inlet penetrating into another end of the base to define an inlet opening; and
a sealing member having one end formed of a second connecting portion and another end formed of an air outlet; the second connecting portion and the first connecting portion connected to each other in order to seal said another end of the air inlet; and the supporting portion penetrating through the air outlet;
wherein the sealing member comprises an intermediate section extending from the second connecting portion in a direction toward and jointing with the air outlet such that the air outlet is supported by the intermediate section to selectively engage with the distal end of the supporting portion and wherein the intermediate section is kept consistently away from the supporting portion between the proximal end and the distal end of the supporting portion to define an internal hollow space inside the sealing member for receiving an ingress flow of fluid through the inlet opening.

### Claim 2 (depends on 1)

The negative pressure backflow prevention apparatus according to claim 1, wherein the base and the sealing member are further installed at an internal of an air guide in order to effectively guide a gas to a predefined location via the air guide.

### Claim 3

(canceled)

### Claim 4 (depends on 1)

The negative pressure backflow prevention apparatus according to claim 1, wherein a vertical cross-sectional profile the sealing member has a shape of any one of a triangle, a rectangle and a trapezoid.

### Claim 5 (depends on 1)

The negative pressure backflow prevention apparatus according to claim 1, wherein a center of the base is formed of the supporting portion and the first connecting portion.

### Claim 6 (depends on 5)

The negative pressure backflow prevention apparatus according to claim 5, wherein a horizontal cross-sectional profile of the base has a shape of one of a circle, a triangle, a rectangle and a star.