Oil spray nozzle capable of preventing oil dripping

Abstract

The utility model relates to an oil spray nozzle, in particular to an oil spray nozzle capable of preventing oil dripping. The oil nozzle is provided with an inner cavity, the inner cavity is provided with an inlet end face and an outlet end face, the outlet end face of the inner cavity is an oil spraying opening of the oil nozzle, the inner cavity comprises a first cavity body and a second cavity body which are sequentially arranged in the oil spraying direction of the oil nozzle, and the first cavity body is provided with an inlet end face and an outlet end face. The second cavity is provided with an inlet end face and an outlet end face, the inlet end face of the first cavity is the inlet end face of the inner cavity, the outlet end face of the second cavity is the outlet end face of the inner cavity, and the sectional area, perpendicular to the oil injection direction, of the first cavity is smaller than that, perpendicular to the oil injection direction, of the second cavity. A step face surrounding the outlet end face of the first cavity and facing the outlet end face of the oil nozzle is arranged in the inner cavity. The distance L between the outlet end face of the first cavity and the outlet end face of the second cavity meets the following condition that L is larger than or equal to 1.0 mm and smaller than or equal to 3.0 mm.

Description

Technical Field

[0001] The utility model relates to a fuel injection nozzle, in particular to an anti-drip fuel injection nozzle. Background Art

[0002] Existing fuel injectors such as Figure 1 As shown, the oil-gas mixture in the inner cavity 1 of the fuel injector is sprayed out from the outlet end face 11 of the inner cavity 1 (i.e., the fuel injection port of the fuel injector) in the fuel injection direction i. When the fuel injection direction i is perpendicular to the gravity direction g, some oil will adhere to the end face P of the fuel injector after a period of fuel injection. When the adhered oil reaches a certain amount, it will slide to the lower side of the fuel injector. When the oil droplets accumulated on the lower side of the fuel injector grow to a certain size, they will drip downwards, causing some adverse effects. For example, for the fuel injector used for lubricating the knitting needles in the circular knitting machine, the dripping oil will contaminate the fabric. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to improve the oil dripping problem of the oil injection nozzle when the oil injection direction is perpendicular to the gravity direction.

[0004] In order to solve the above technical problems, the inventor of the present utility model redesigned the inner cavity structure of the fuel injection nozzle.

[0005] The utility model provides an anti-drip fuel injection nozzle, which has an inner cavity, the inner cavity has an inlet end face and an outlet end face, the outlet end face of the inner cavity is the fuel injection port of the fuel injection nozzle, the inner cavity comprises a first cavity and a second cavity which are sequentially arranged along the fuel injection direction of the fuel injection nozzle, the first cavity has an inlet end face and an outlet end face, the second cavity has an inlet end face and an outlet end face, the inlet end face of the first cavity is the inlet end face of the inner cavity, the outlet end face of the second cavity is the outlet end face of the inner cavity, the cross-sectional area of the first cavity perpendicular to the fuel injection direction is smaller than the cross-sectional area of the second cavity perpendicular to the fuel injection direction, and a step surface is provided in the inner cavity which surrounds the outlet end face of the first cavity and faces the outlet end face of the fuel injection nozzle; the distance L between the outlet end face of the first cavity and the outlet end face of the second cavity satisfies the following conditions: 1.0mm≤L≤3.0mm.

[0006] When the oil injection direction is perpendicular to the direction of gravity, the oil adheres to the step surface surrounding the outlet end face of the first cavity. When the attached oil reaches a certain amount, it slides down and temporarily remains in the second cavity. The oil in the second cavity will gradually be carried out and consumed by the oil-gas mixture sprayed out of the first cavity, thereby improving the oil dripping problem of the injector nozzle.

[0007] The effectiveness of the anti-drip system is affected by the distance L between the outlet end faces of the first and second cavities. If L is too small, the second cavity's oil storage capacity is poor, and oil in the second cavity may overflow from the nozzle. If L is too large, oil tends to accumulate around the outlet end face of the second cavity, causing the same dripping problem as in the prior art. Testing has shown that the anti-drip system achieves optimal effectiveness when the distance L between the outlet end faces of the first and second cavities meets the following conditions: 1.5mm ≤ L ≤ 2.0mm.

[0008] Preferably, the first cavity and the second cavity are both cylindrical cavities, and the two are coaxially arranged. This makes processing relatively simple and convenient to use. If the second cavity is designed as a truncated cone-shaped cavity, and the larger end of the second cavity is connected to the first cavity, the processing of the second cavity is relatively difficult. If the first cavity and the second cavity are designed to be non-coaxial, when installing the fuel injector, extra attention should be paid to ensure that the larger part of the step surface is located below the outlet end face of the first cavity, so as to prevent the oil-gas mixture ejected from the outlet end face of the first cavity from directly pushing the oil in the second cavity out of the fuel injector (rather than bringing it out little by little), causing oil dripping. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a cross-sectional view of an existing fuel injection nozzle;

[0010] Figure 2 This is a cross-sectional view of a fuel injection nozzle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0011] One embodiment of the present invention will be described below with reference to the accompanying drawings.

[0012] See also Figure 2 A drip-proof fuel injector includes an inner cavity 2 having an inlet end face and an outlet end face 21. The outlet end face 21 of the inner cavity 2 serves as the fuel injection port of the fuel injector. The inner cavity 2 includes a first cavity 2a and a second cavity 2b, which are sequentially arranged along the fuel injection direction i of the fuel injector. The first cavity 2a and the second cavity 2b are both cylindrical cavities and are coaxially arranged (axis J). The radial dimension of the first cavity 2a is smaller than that of the second cavity 2b.

[0013] The first cavity 2a has an inlet end face and an outlet end face, and the second cavity 2b has an inlet end face and an outlet end face. The inlet end face of the first cavity 2a is the inlet end face of the inner cavity 2, the outlet end face of the first cavity 2a is a part of the inlet end face of the second cavity 2b, and the outlet end face of the second cavity 2b is the outlet end face 21 of the inner cavity 2.

[0014] The principle of anti-drip oil of this fuel injector is as follows: when the oil-gas mixture is input from the first cavity 2a to the second cavity 2b, the oil will adhere to the periphery of the outlet end face of the first cavity 2a, that is, the step surface Q surrounding the outlet end face of the first cavity 2a. After the attached oil reaches a certain amount, it slides downward and is caught by the lower side wall of the second cavity 2b, temporarily remaining in the second cavity 2b. At the same time, the oil in the second cavity 2b is gradually carried out and consumed little by little by the oil-gas mixture ejected from the first cavity 2a.

[0015] The effect of anti-drip oil is related to the air pressure of the nozzle, the radial size of the first cavity 2a, the radial size of the second cavity 2b, and the distance L. The air pressure of the nozzle is generally 1.0 kg / cm 2 Up to 2.0kg / cm 2 The radial dimension of the first cavity 2a (i.e., the diameter of the cross section perpendicular to the direction of oil injection) is generally between 0.5mm and 0.9mm. When the oil-air mixture flows from the first cavity 2a (with a smaller cross-sectional area) into the second cavity 2b (with a larger cross-sectional area), the flow rate of the oil-air mixture decreases due to the increase in the cross-sectional area perpendicular to the direction of oil injection. The flow rate also decreases with distance from the outlet end face of the first cavity 2a. Therefore, the cross-sectional area of the second cavity 2b should not be too large, and the length should not be too long, otherwise it will not be conducive to the discharge of oil from the second cavity 2b. Preferably, the radial dimension of the second cavity 2b (i.e., the diameter of the cross section perpendicular to the direction of oil injection) is between 1.1mm and 1.5mm, and the distance L is between 1.5mm and 2.0mm.

[0016] The above embodiments and illustrations do not limit the product form and style of the present invention. Any appropriate changes and modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A drip-proof fuel injector, the fuel injector having an inner cavity, the inner cavity having an inlet end face and an outlet end face, the outlet end face of the inner cavity being the fuel injection port of the fuel injector, the inner cavity comprising a first cavity and a second cavity sequentially arranged along the fuel injection direction of the fuel injector, the first cavity having an inlet end face and an outlet end face, the second cavity having an inlet end face and an outlet end face, the inlet end face of the first cavity being the inlet end face of the inner cavity, and the outlet end face of the second cavity being the outlet end face of the inner cavity, characterized in that: The cross-sectional area of the first cavity perpendicular to the direction of fuel injection is smaller than the cross-sectional area of the second cavity perpendicular to the direction of fuel injection. There is a step surface in the inner cavity that surrounds the outlet end face of the first cavity and faces the outlet end face of the injector nozzle; the distance L between the outlet end face of the first cavity and the outlet end face of the second cavity meets the following conditions: 1.0mm≤L≤3.0mm.

2. The fuel injector according to claim 1, wherein: A distance L between an outlet end surface of the first cavity and an outlet end surface of the second cavity satisfies the following condition: 1.5 mm ≤ L ≤ 2.0 mm.

3. The fuel injection nozzle according to claim 1 or 2, characterized in that: The first cavity and the second cavity are both cylindrical cavities, and the two are coaxially arranged.

4. The fuel injection nozzle according to claim 3, wherein: The air pressure range of the fuel injection nozzle is 1.0kg / cm 2 Up to 2.0kg / cm 2 When the radial dimension range of the first cavity is 0.5 mm to 0.9 mm, the radial dimension range of the second cavity is 1.1 mm to 1.5 mm.

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