Patent Application
20150090357
1. Field of the Invention
The present invention relates to a check valve apparatus which can prevent fluids from flowing reversely.
2. Description of the Prior Art
The main object of check valve apparatuses is to allow fluids to flow toward the same direction and to block fluids from flowing reversely through the design of the valve. Please refer to TW 509300 for a conventional check valve apparatus. TW 509300 disclosed an integrally formed rubber body, wherein an end is a round water inlet, the other end is a water outlet with two side bodies gradually slanted forward, two side bodies of the furthest forward end of the water outlet are air tight, a front end of a ring body of the round inlet is formed with two semi-circle water-stopping rings, a step face in the upper part is formed with a ring trough, and two sides are formed with reinforcing bodies so as to prevent water from flowing reversely.
However, when the check valve apparatus blocks water from flowing reversely, the reverse water flow can produce a water pressure. When the water pressure of the reverse water flow is more than the two side bodies of the water outlet can endure, the two side bodies will be deformed. Hence, the water outlet will be open, and the reverse water flow will go through the water outlet and flow back to a water hose; that is, the check valve apparatus lost its function.
The present invention is, therefore, arisen to obviate or at least mitigate the above-mentioned disadvantages.
In view of the above-mentioned disadvantages, the main object of the present invention is to provide a check valve which has excellent effect of back-flow prevention and won't be affected by a water pressure of a reverse flow.
To achieve the main and other objects, the present invention provides a check valve, including a position limiting member, a back-flow preventing member and a lid body.
The position limiting member is formed with a large diameter axle hole and a small diameter axle hole, and a stepped portion is formed between the large and small diameter axle holes. The position limiting member includes a clasping portion.
The back-flow preventing member includes a blocking portion and a fixing portion. The blocking portion is disposed in the large diameter axle hole, and an external diameter of the blocking portion is larger than the small diameter axle hole. The fixing portion is restrictedly assembled with the clasping portion. The lid body is disposed in the large diameter axle hole and has at least one orifice and at least one abutting rib. The abutting rib is abutted against the back-flow preventing member so as to allow the back-flow preventing member to be fixed between the lid body and the position limiting member. The blocking portion is flexible; therefore, when the blocking portion is impacted by an external water source, a gap is formed between an external peripheral verge of the blocking portion and the stepped portion for allowing the large and small diameter axle hole to be communicated with each other. When the blocking portion is impacted by a reverse water source, the external peripheral verge of the blocking portion is abutted against the stepped portion, so the large and small diameter axle holes are non-communicated with each other.
Therefore, no matter how large water pressure the reverse water flow produces, the external peripheral verge of the blocking portion will neither fall off from the stepped portion nor create a gap. The check valve of the present invention can effectively prevent the water source from flowing back to a water hose.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention.
Please refer to
The position limiting member 20 includes a hollow tubular body 21 and a clasping portion 22. The tubular body 21 is provided for being disposed in a water hose, and an external diameter of the tubular body 21 can be designed in accordance with the hoses a user wants to assemble. In this embodiment, an O ring 23 is disposed around an external surface of the tubular body 21 (the external surface of the tubular body 21 is formed with an annular groove for disposal of O ring 23), and the O ring 23 can increase the sealing effect of the tubular body 21 and the water hose. The tubular body 21 is formed with a large diameter axle hole 211 and a small diameter axle hole 212. A stepped portion 213 is formed between the large and small diameter axle holes 211, 212, and an internal surface around the large diameter axle hole 211 is formed with a hook portion 214. The clasping portion 22 includes a plurality of ribs 221 and a ring rib 222, and the ribs 221 are connected between the tubular body 21 and the ring rib 222. The ribs 221 are arranged in intervals and formed with a plurality of hollowed-out portions, and the ring rib 222 is formed with a circular hole 2221.
The back-flow preventing member 30 includes a blocking portion 31 and a fixing portion 32. The blocking portion 31 is disposed in the large diameter axle hole 211 of the tubular body 21, and the external diameter of the blocking portion 31 is larger than the small diameter axle hole 212. Preferably, the blocking portion 31 is a flexible round sheet body, wherein the flexible round sheet body can be deformed when being affected by an external pressure and will return to its original state without the external pressure. The fixing portion 32 includes a neck portion 321 and a head portion 322, and the neck portion 321 is extended from the blocking portion 31 into the small diameter axle hole 212; that is, an extending direction of the neck portion 321 is opposite to a flow direction of an external water source. On the contrary, the extending direction of the neck portion 321 is the same as a flow direction of a reverse water source. The head portion 322 is disposed at an end of the neck portion 321 remote from the blocking portion 31 and at a center of the blocking portion 31. Preferably, an end of the head portion 322 remote from the neck portion 321 is tapered, and preferably in a conical shape. The head portion 322 is disposed through the ring hole 2221 of the ring rib 222 and blocked by the ring rib 222, so the ring rib 222 is positioned between the head portion 322 and the blocking portion 31.
The lid body 40 is disposed in the large diameter axle hole 211 and has a plurality of orifices 41 and at least one abutting rib 42. Each orifice is designed with an interval reinforcing sheet and has the effects of rectification and reinforcement. The abutting rib 42 is extended from a center of the lid body 40, and the abutting rib 42 is abutted against the back-flow preventing member 30 so as to allow the back-flow preventing member 30 to be positioned between the lid body 40 and the position limiting member 20. More specifically, the abutting rib 42 is abutted against a side of the blocking portion 31 of the back-flow preventing member 30 remote from the stepped portion 213 so as to allow the back-flow preventing member 30 to be fixedly positioned between the lid body 40 and the position limiting member 20. In this embodiment, the lid body 40 has a clasping slot 43. The hook portion 214 is barbed and stuckable in the clasping slot 43 so as to make the lid body 40 fixed in the large diameter axle hole (The lid body 40 is deformable, which enables the hook portion to be stuckable in the clasping slot).
The check valve of the present invention can be assembled with the water hose as shown in
No matter how large water pressure the reverse water (fluid) causes, the external peripheral verge of the blocking portion 31 will neither fall off from the stepped portion 213 nor create a gap so as to make sure that water (fluid) will not flow reversely. What's more important, as the water pressure of the reverse water (fluid) increases, the external peripheral verge of the blocking portion 31 will be engaged tighter with the stepped portion 213. The engaging force and the reverse water pressure are in direct proportion, so the effect of back-flow prevention is more stable.
Furthermore, the fixing portion 32 of the back-flow preventing member 30 is restrictedly assembled with the clasping portion 22 of the position limiting member 20, and the abutting rib 42 of the lid body 40 is abutted against the back-flow preventing member 30, so the back-flow preventing member 30 is positioned by two affections (engaging force and the reverse water pressure) and fixedly disposed in the position limiting member 20. When the water source enters the small diameter axle hole 212 of the tubular body 21, the fixing portion 32 of the back-flow preventing member 30 will not fall off from the clasping portion 22 of the position limiting portion 20 no matter how large the water pressure is.
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
