Novel duckbill valve

Abstract

The utility model discloses a novel duckbill valve which comprises a duckbill valve outer-layer shell and a base and is characterized in that a cavity is formed in the outer-layer shell, a liquid input port communicated with the cavity is formed in the lower end face of the base, the outer-layer shell is contracted inwards from bottom to top, and a liquid output channel communicated with the cavity is formed in the top of the outer-layer shell; the length of the liquid output channel is at least 2 mm, the width of the liquid output channel is at least 0.1 mm, a cavity formed in the outer-layer shell is composed of an upper-layer cavity body and a lower-layer cavity body, the upper-layer cavity body is in a cone shape with the conical tip included angle being 47.64 degrees in the section view and is connected with the liquid output channel, and the lower-layer cavity body is in a cylinder shape and is connected with the liquid input port. According to the novel duckbill valve, the size, the structure, the internal included angle and the radian of the outer surface of the duckbill valve shell are redesigned and arranged on the basis of an original product, the sealing performance of the novel duckbill valve is effectively improved, the liquid leakage rate is reduced, and meanwhile the production and machining difficulty of the novel duckbill valve is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of novel medicinal valves, in particular to a novel duckbill valve which is mostly used in infusion pump products. Background Art

[0002] The duckbill valve is so named because of its shape similar to a duckbill. When there is no internal pressure, the liquid output channel at the duckbill is closed due to the elasticity of its own material; as the internal pressure gradually increases, the liquid output channel at the duckbill gradually increases, allowing the liquid to be discharged at a high flow rate; when the external pressure is greater than the internal pressure, the liquid output channel at the duckbill is closed.

[0003] The duckbill valve used in the prior art may cause leakage when used on infusion pump products due to the loose closure of the liquid output channel at the duckbill and the loose fit between the base and the plastic parts, which may cause the backflow of the drug solution and contamination of the drug solution. In addition, the longer liquid output channel at the duckbill is not convenient for punching and cutting during the actual production process, which increases the difficulty of production. Utility Model Content

[0004] The utility model is proposed in view of the above-mentioned many existing defects, and its purpose is to provide a new duckbill valve with good sealing performance, low leakage probability and easy punching and cutting in actual production.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: it includes a duckbill valve outer shell and a base, and also includes: a cavity is arranged inside the outer shell, a liquid input port connected to the cavity is arranged on the lower end surface of the base, the outer shell converges inward from bottom to top and a liquid output channel connected to the cavity is arranged on the top, and the length of the liquid output channel is at least 2 mm and the width is at least 0.1 mm.

[0006] In order to enable the liquid to be smoothly input and output inside the duckbill valve, and at the same time make the liquid output channel at the duckbill of the new duckbill valve close more tightly when the external pressure is greater than the internal pressure, thereby reducing the probability of leakage, the preferred technical solution is that the cavity arranged inside the outer shell is composed of an upper cavity and a lower cavity, the upper cavity is cone-shaped with a cone tip angle of 47.64° in the cross-sectional view and is connected to the liquid output channel, and the lower cavity is cylindrical and is connected to the liquid input port.

[0007] In order to make the liquid output channel at the duckbill of the new duckbill valve have a tendency to close, and when the external pressure is greater than the internal pressure, ensure that the liquid output channel at the duckbill is closed more tightly to reduce the probability of leakage, the preferred technical solution is that the inner and outer sides of the outer shell are both provided with wedge surfaces and conical surfaces, including a first outer wedge surface, a second outer conical surface, a first inner wedge surface, a second inner wedge surface, a third inner conical surface, and a fourth inner conical surface; the first outer wedge surface is located above the second outer conical surface, the first inner wedge surface is located above the second inner wedge surface, and the second The inner wedge surface is located on the third inner conical surface, and the third inner conical surface is located on the fourth inner conical surface; the curvature of the first outer wedge surface is R10.3mm and converges inward, the angle between the second outer conical surface and the perpendicular bisector of the duckbill valve is 4°, the curvature of the first inner wedge surface is R10.3mm, the curvature of the second inner wedge surface is R2.0mm, the angle between the third inner conical surface and the perpendicular bisector of the duckbill valve is 23.82°, and the angle between the fourth inner conical surface and the perpendicular bisector of the duckbill valve is 1°; the hypotenuse formed by the first inner wedge surface, the second inner wedge surface, and the third inner conical surface converges inward.

[0008] In order to make the circumference of the base of the new duckbill valve fit more closely with the supporting plastic parts, thereby effectively reducing the probability of leakage and the probability of process defects during processing and facilitating processing, the preferred technical solution is that the base is cylindrical, a cavity is arranged inside the base, the base diameter is 5.5mm, and the upper tolerance is 0.05mm, and the lower tolerance is 0; the height is 1.30mm, the upper tolerance is 0.02 mm, and the lower tolerance is 0.

[0009] In order to ensure that the liquid output channel at the duckbill of the duckbill valve can deform within a certain range and thus be tightly closed, and to ensure that the service life of the product meets the requirements, the preferred technical solution is that the outer shell and the base of the duckbill valve are made of elastic rubber material.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting the size of the base of the new duckbill valve, it can fit more closely with the supporting plastic parts, effectively reducing the probability of leakage and the probability of process defects during processing. By setting the inclined structure, the liquid output channel at the duckbill of the duckbill valve has a tendency to close, and when the external pressure is greater than the internal pressure, the liquid output channel closes more tightly, and the probability of leakage is reduced. The size setting of the liquid output channel makes the new duckbill valve easier to punch during processing, effectively reducing the difficulty of processing, and at the same time, the size of the liquid output channel is reduced, which reduces the probability of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 For this utility model, Figure 2 It is the left view of the utility model;

[0012] In the figure: 1. New duckbill valve; 2. Outer shell; 3. Base; 4. Upper cavity; 5. Lower cavity; 6. Liquid output channel; 7. Liquid input port; 8. Angle; 9. First outer wedge surface; 10. Second outer conical surface; 11. First inner wedge surface; 12. Second inner wedge surface; 13. Third inner conical surface; 14. Fourth inner conical surface. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Embodiment 1

[0014] A novel duckbill valve 1 includes an outer shell 2 and a base 3, both of which are made of elastic rubber material; the base 3 is a cylinder with a cavity inside, and the diameter and height of the base 3 are set, the diameter is changed to 5.5mm, and the upper tolerance is 0.05mm, and the lower tolerance is 0; the height is changed to 1.30mm, and the upper tolerance is 0.02 mm, and the lower tolerance is 0, which can make the base 3 fit more closely with the supporting plastic parts, thereby effectively reducing the probability of leakage and at the same time reducing the probability of process defects when processing the base; a cavity is arranged inside the outer shell 2 and the base 3 to allow the liquid inside the duckbill valve 1 to flow in and out, and the cavity is divided into an upper cavity 4 that is approximately conical and a lower cavity 5 that is approximately cylindrical; arranged on the top of the outer shell 2 is a liquid output channel 6 at the duckbill, and the liquid output channel 6 is connected with the upper cavity 4, and the degree of the cone tip angle of the upper cavity 4 at the liquid output channel 6 is set to 47.64°, and the lower end face of the base 3 is provided with a liquid input port 7 that is connected with the lower cavity 5; in order to facilitate punching during processing and to reduce the probability of leakage, the length of the liquid output channel 6 is set to 2mm and the width is set to 0.1mm.

[0015] The inner and outer surfaces of the outer shell 2 are composed of conical surfaces and wedge surfaces. The outer surface of the outer shell 2 is provided with a first outer wedge surface 9 and a second outer conical surface 10. The first outer wedge surface 9 is concave and located above the second outer conical surface 10. The utility model sets the curvature of the first outer wedge surface 9 to R10.3mm, and sets an angle for the second outer conical surface 10 so that it has an angle of 4° with the mid-perpendicular line of the duckbill valve 1, and the first outer wedge surface 9 converges inward. The inner surface of the outer shell 2 is provided with a first inner wedge surface 11, a second inner wedge surface 12, a third inner conical surface 13, and a fourth inner conical surface 14; the first inner wedge surface 11 is concave and located on the second inner wedge surface 12, the second inner wedge surface 12 is convex and located on the third inner conical surface 13, and the third inner conical surface 13 is located on the fourth inner conical surface 14; the curvature of the first inner wedge surface 11 is set to R10.3mm, the curvature of the second inner wedge surface 12 is set to R2.0mm, and an angle is set for the third inner conical surface 13 so that it has a 23.82 degree angle with the perpendicular bisector of the duckbill valve 1 °, an angle is set for the fourth inner cone 14 so that it has an angle of 1° with the perpendicular bisector of the duckbill valve 1, and on the inner surface of the outer shell 2, the hypotenuses composed of the first inner wedge surface 11, the second inner wedge surface 12 and the third inner cone 13 converge inward together; by setting the inner and outer arc surfaces and the inclined surface structure of the above-mentioned outer shell 2, the liquid output channel 6 of the new duckbill valve 1 tends to be more closed. In actual application, when the external pressure is greater than the internal pressure, the liquid output channel 6 is closed more tightly, and the leakage probability is reduced from 2% to 0.5%.

[0016] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A novel duckbill valve, comprising an outer shell of the duckbill valve and a base, characterized in that: Also includes: The outer shell is provided with a cavity inside, and a liquid input port connected to the cavity is provided on the lower end surface of the base. The outer shell converges inward from bottom to top and a liquid output channel connected to the cavity is provided on the top. The length of the liquid output channel is at least 2 mm and the width is at least 0.1 mm. The cavity provided inside the outer shell is composed of an upper cavity and a lower cavity. The upper cavity is a cone with a cone tip angle of 47.64° in the cross-sectional view and is connected to the liquid output channel. The lower cavity is a cylinder and is connected to the liquid input port. The first outer wedge surface provided on the outer shell The curvature is R10.3mm and converges inward, the angle between the second outer cone and the perpendicular midline of the duckbill valve is 4°, the curvature of the first inner wedge surface arranged outside the outer shell is R10.3mm, the curvature of the second inner wedge surface is R2.0mm, the angle between the third inner cone and the perpendicular midline of the duckbill valve is 23.82°, the angle between the fourth inner cone and the perpendicular midline of the duckbill valve is 1°, the base is cylindrical, a cavity is arranged inside the base, the diameter of the base is 5.5mm, the upper tolerance is 0.05mm, and the lower tolerance is 0; the height is 1.30mm, the upper tolerance is 0.02 mm, and the lower tolerance is 0.

2. The novel duckbill valve according to claim 1, characterized in that: The inner and outer sides of the outer shell are provided with wedge surfaces and conical surfaces, including a first outer wedge surface, a second outer conical surface, a first inner wedge surface, a second inner wedge surface, a third inner conical surface, and a fourth inner conical surface; the first outer wedge surface is located above the second outer conical surface, the first inner wedge surface is located above the second inner wedge surface, the second inner wedge surface is located above the third inner conical surface, and the third inner conical surface is located above the fourth inner conical surface.

3. The novel duckbill valve as claimed in claim 2, characterized in that; The hypotenuse formed by the first inner wedge surface, the second inner wedge surface and the third inner conical surface converges inwards.

4. The novel duckbill valve according to claim 1, characterized in that: The outer shell and the base of the duckbill valve are made of elastic rubber material.

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