Manual oil pumping diaphragm assembly of carburetor

Abstract

The manual oil pumping diaphragm assembly of the carburetor comprises a supporting pad, the supporting pad is used for being connected and attached to the connecting end face of an upper port of an oil pumping cavity of the carburetor, and the upper side face of the supporting pad is connected with an elastic diaphragm piece in a covering mode. An annular concave part which enables the bottom face of the diaphragm piece to form an annular shape and arch downwards is arranged on the portion, located in the circular through opening of the supporting pad, of the diaphragm piece, and a protruding column used for pushing an oil quantity adjusting swing piece in the oil pumping chamber is fixed to the center of the diaphragm piece. The manual oil pumping diaphragm assembly of the carburetor can be conveniently used for sealing and covering the upper end opening of the oil pumping cavity of the carburetor, and the movement stroke of the diaphragm can be increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to a carburetor manual oil pumping diaphragm assembly. BACKGROUND

[0002] At present, the engine with carburetor usually works in normal temperature environment, but with the expanding of the application environment of the engine, such as the engine with carburetor used in the unmanned aerial vehicle running in high altitude, the complex environment in high altitude and the large temperature variation range cause the engine to stop working frequently and the unmanned aerial vehicle to crash.

[0003] When the engine with carburetor starts in low temperature environment (for example, below minus 10 degrees Celsius), the engine rotates slowly, and the negative pressure generated by the engine is not enough to push the needle valve to realize oil intake, because the carburetor relies on the negative pressure generated by the engine as the oil pumping power of the oil pumping cavity to realize oil intake. UTILITY MODEL CONTENTS

[0004] The utility model discloses a carburetor manual oil pumping diaphragm assembly which is convenient to seal and cover the upper port of the oil pumping cavity of the carburetor and helps to increase the activity stroke of the diaphragm.

[0005] The technical scheme of the utility model is as follows: a carburetor manual oil pumping diaphragm assembly, comprising a supporting pad used to connect the connecting end face of the upper port of the oil pumping cavity of the carburetor, the upper side of the supporting pad is connected with a flexible diaphragm, the diaphragm is provided with a ring-shaped recess in the circular through port of the supporting pad, the recess forms a ring-shaped downward arch on the bottom surface of the diaphragm, the radius of the arc surface of the recess is 3-5 mm, and the center of the diaphragm is fixed with a convex column used to push the oil amount adjusting pendulum in the oil pumping chamber.

[0006] Further, the supporting pad and the peripheral part of the diaphragm are provided with through holes, and the through holes correspond to the threaded holes on the connecting end face of the upper port of the oil pumping cavity.

[0007] Further, the supporting pad and the diaphragm are glued and fixed.

[0008] Further, the upper side of the diaphragm is provided with an upper pressing piece, the lower side of the diaphragm is provided with a lower pressing piece, and the convex column passes through the lower pressing piece, the diaphragm and the upper pressing piece in sequence from bottom to top and is connected and fixed.

[0009] Further, the upper pressing piece and the lower pressing piece are circular, the diameter of the upper pressing piece is smaller than the diameter of the lower pressing piece, and the lower pressing piece is provided with a hollow part.

[0010] Further, the diameter of the section of the convex column passing through the upper pressing piece is smaller than the diameter of the section of the lower pressing piece, and the upper pressing piece and the lower pressing piece are clamped and anchored on the diaphragm through the convex column.

[0011] Further, the thickness of the supporting pad is 0.8-1.5 mm, the thickness of the diaphragm is 0.1-0.2 mm, and the height of the annular downward arch of the annular recess is 1-1.5 mm.

[0012] Further, the supporting pad is made of an asbestos material, and the diaphragm is made of a butyl rubber, a PVC or a PTFE material.

[0013] Further, the upper side of the diaphragm is provided with a pressing cover for pressing on the end surface of the upper end port of the oil pumping cavity, the pressing cover has an upward arch part, and the middle part of the arch part is provided with an elastic button for driving the convex column.

[0014] Further, the elastic button comprises a cylindrical pipe passing through the through hole in the center of the arch part, the lower end of the cylindrical pipe is provided with an annular flange for limiting the inner end surface of the pressing cover and pushing the upper end of the convex column, the upper end of the cylindrical pipe is provided with a snap spring, the lower side of the cylindrical pipe is provided with a limiting pad, and the cylindrical pipe is provided with a compression spring between the limiting pad and the upper end surface of the pressing cover.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. The carburetor manual oil pumping diaphragm assembly is convenient for being capped on the upper end port of the oil pumping cavity of the carburetor, the radius of the arc surface of the arc-shaped recess is increased, the movement stroke of the diaphragm is increased, and the pressing frequency during manual oil pumping is reduced.

[0017] 2. The carburetor manual oil pumping diaphragm assembly can effectively improve the strength of the diaphragm and reduce the damage probability of the diaphragm by arranging the lower pressing piece with a larger diameter on the bottom surface of the diaphragm.

[0018] 3. The carburetor manual oil pumping diaphragm assembly can better drive the convex column to push the oil quantity adjusting swing piece (needle valve) in the oil pumping cavity to realize manual oil pumping by cooperating with the elastic button on the pressing cover. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1This is a schematic diagram of the structure of an oil extraction diaphragm assembly according to the present invention;

[0020] Figure 2 This is a top view of the oil extraction diaphragm assembly of this utility model;

[0021] Figure 3 For the present utility model Figure 2 AA section view;

[0022] Figure 4 For the present utility model Figure 3 Enlarged view of area B;

[0023] Figure 5 This is a schematic diagram of another oil extraction diaphragm assembly according to the present invention;

[0024] Figure 6 For the present utility model Figure 5 Exploded view of the oil extraction diaphragm assembly;

[0025] Figure 7 This is a schematic diagram of the structure of a pressure cap according to the present invention;

[0026] Figure 8 For the present utility model Figure 7 An exploded view of the pressure cap shown;

[0027] Figure 9 For the present utility model Figure 7 The diagram shows a cross-sectional view of the gland and the oil extraction diaphragm assembly in action.

[0028] Figure 10 This is a schematic diagram of another pressure cap of this utility model;

[0029] Figure 11 For the present utility model Figure 10 The diagram shows a cross-sectional view of the gland and the oil extraction diaphragm assembly in action.

[0030] In the diagram: 1-Carburetor 2-Fuel extraction chamber 3-Connecting end face 4-Fuel volume adjustment component 10-Support pad 11-Circular opening 12-Through hole 13-Positioning hole 20-Diaphragm 21-Annular recess 22-Deformation part 23-Arch-shaped protrusion 30-Protrusion 40-Upper pressure plate 50-Lower pressure plate 60-Pressure cap 61-Arched part 62-Bolt hole 63-Central through hole 70-Elastic button 71-Columnar tube 72-Annular flange 73-Snap ring 74-Limiting pad 75-Compression spring 76-Channel. Detailed Implementation

[0031] To make the above-mentioned features and advantages of this utility model more easily understood, specific embodiments are described below in conjunction with the accompanying drawings, but this utility model is not limited thereto.

[0032] refer to Figures 1 to 11

[0033] A manual diaphragm assembly for a carburetor includes a support pad 10, which is attached to the connecting end face 3 of the upper port of the suction chamber 2 of the carburetor 1. An elastic diaphragm 20, covering the upper side of the support pad, is fixedly connected to the support pad, thereby forming a sealed chamber in the carburetor's suction chamber. The diaphragm has an annular recess 21 within the circular opening 11 of the support pad, creating a downwardly arched deformable portion 22 on the bottom surface of the diaphragm. The radius of the arc surface of the annular recess is 3-5 mm. A protrusion 30 is fixed at the center of the diaphragm to push the fuel level adjustment mechanism 4 within the suction chamber. By pushing the fuel level adjustment mechanism with the protrusion, the mechanism pries up the needle valve inside the carburetor, ensuring unobstructed flow between the fuel path and the suction chamber. Increasing the radius of the arc surface of the annular recess effectively increases the lifting stroke of the protrusion (diaphragm), effectively increasing the fuel volume pumped from the suction chamber and reducing the number of presses required for manual evacuation.

[0034] In this embodiment, to facilitate better installation of the support pad and diaphragm on the carburetor body, through holes 12 are provided at intervals around the periphery of the support pad and diaphragm. These through holes correspond to threaded holes on the upper port connection face of the oil extraction chamber, allowing connecting bolts to pass through them. The support pad and diaphragm are also provided with positioning holes 13 to prevent misalignment during installation.

[0035] In this embodiment, the support pad is glued to the diaphragm sheet. The diaphragm sheet is also provided with an arc-shaped protrusion 23 that protrudes outward from the support pad, which facilitates the installation, removal and other operations of the diaphragm sheet.

[0036] In this embodiment, an upper pressure plate 40 is provided on the upper side of the diaphragm, and a lower pressure plate 50 is provided on the lower side of the diaphragm. The protruding post passes through the lower pressure plate, the diaphragm, and the upper pressure plate sequentially from bottom to top, and the upper and lower pressure plates are clamped and fixed to the diaphragm through the protruding post. Specifically, the protruding post is anchored to the upper pressure plate.

[0037] In this embodiment, to prevent the upper and lower pressure plates from damaging the diaphragm, both the upper and lower pressure plates are circular, thereby providing strength to the connection area between the diaphragm and the protrusion.

[0038] In this embodiment, the diameter of the upper pressure plate is smaller than that of the lower pressure plate. By making the diameter of the lower pressure plate larger than that of the upper pressure plate, and the diameter of the lower pressure plate slightly smaller than the diameter of the inner ring of the arc-shaped concave part, the diaphragm can be prevented from being damaged when the amount of oil in the oil extraction chamber is too large, so as to further improve the strength of the diaphragm.

[0039] In this embodiment, the lower pressure plate is provided with a hollowed-out portion, which helps to reduce the weight of the lower pressure plate.

[0040] In this embodiment, the diameter of the section of the convex column that protrudes through the upper pressing plate is smaller than the diameter of the section of the lower pressing plate. The larger diameter of the lower section of the convex column can better push the oil amount adjusting swing piece.

[0041] In this embodiment, the thickness of the supporting pad is 0.8-1.5 mm, and the thickness of the diaphragm is 0.1-0.2 mm. The height of the annular concave portion that arches downward is 1-1.5 mm. In a preferred embodiment, the radius of the arc surface of the annular concave portion is 3.7-3.8 mm, the outer diameter of the annular concave portion is 32-33 mm, the diameter of the circle where the lowest point of the arc surface of the annular concave portion is located is 27-28 mm, and the height of the annular concave portion that arches downward is 1-1.25 mm. By increasing the radius and arc length of the arc surface of the annular concave portion, the lifting stroke of the convex column (diaphragm) can be effectively increased, and the oil pumping amount of the oil pumping chamber can be effectively increased.

[0042] In this embodiment, the supporting pad is made of asbestos material, and the diaphragm is made of butyronitrile rubber, PVC or PTFE material, which effectively improves the oil resistance and wear resistance.

[0043] In this embodiment, in order to better seal the oil pumping chamber and drive the convex column, a pressing cover 60 is arranged on the upper side of the diaphragm and used to press on the connecting end surface of the upper port of the oil pumping chamber. The pressing cover has an upward arching portion 61, so that the space between the arching portion of the pressing cover and the diaphragm forms a movable chamber. Boltholes 62 are arranged around the pressing cover and correspond to the through holes on the diaphragm, so that the through holes on the diaphragm, the supporting pad and the body of the carburetor are connected and fixed by connecting bolts. The middle part of the arching portion is provided with an elastic button 70 for driving the convex column, so that the convex column is pushed by the elastic button.

[0044] In this embodiment, the elastic button includes a cylindrical pipe 71 that passes through the central through hole 63 of the arching portion. The center of the cylindrical pipe has a hole 76 that communicates between the inside and outside of the pressing cover. The lower end of the cylindrical pipe has an annular flange 72 with a diameter larger than the central through hole, which is used to limit the position of the cylindrical pipe at the inner end surface of the pressing cover when the cylindrical pipe moves upward. The lower end of the cylindrical pipe is used to push the upper end of the convex column. A snap spring 73 is arranged at the upper end of the arching portion and passes through the cylindrical pipe. A limiting pad 74 is arranged at the lower side of the snap spring and around the cylindrical pipe. A compression spring 75 is arranged between the limiting pad and the upper end surface of the pressing cover and around the cylindrical pipe, so that the cylindrical pipe has a restoring force for upward movement by the compression spring.

[0045] Through repeatedly pressing the elastic button manually, the convex column on the diaphragm can drive the oil amount adjusting swing piece (needle valve) in the oil pumping cavity of the carburetor to open the oil passage, so that the oil pumped by the oil pump can pass through the oil passage and the oil pumping cavity to the oil injection port to be injected into the air passage to be fully mixed with the air in the air passage, thereby facilitating the rapid start of the engine.

[0046] Any of the above technical solutions of the utility model discloses, if it discloses numerical range except another declaration, then the numerical range disclosed is preferred numerical range, and any person skilled in the art should understand that: preferred numerical range is only the numerical value of obvious technical effect or representative numerical value among many implementable numerical values. Because there are many values, it is impossible to enumerate, therefore, the utility model discloses part of numerical value to illustrate the technical scheme of the utility model, and the above enumerated numerical value should not constitute the restriction of the protection scope of the utility model.

[0047] The utility model discloses if mutual fixed connection's spare part or structural member is disclosed or involves, then, except another declaration, fixed connection can be understood as: the fixed connection of detachable (for example, using bolt or screw connection), also can be understood as: the fixed connection of undetachable (for example, riveting, welding), of course, mutual fixed connection can be replaced by integral structure (for example, using casting process integral forming and manufacturing) (obviously, except for the integral forming process).

[0048] In addition, the term used for indicating the position relationship or shape in any of the above technical solutions of the utility model includes the state or shape similar, analogous or close to it except another declaration.

[0049] Any component provided by the utility model can be assembled by multiple individual components, or be an individual component manufactured by integral forming process.

[0050] The above is only the preferred embodiment of the utility model, and any change and modification made according to the patent application scope of the utility model should belong to the coverage range of the utility model.

Claims

1. A manual diaphragm assembly for a carburetor, comprising a support pad, characterized in that, The support pad is used to connect to the connecting end face of the upper port of the pumping chamber of the carburetor. The upper side of the support pad is connected and covered with an elastic diaphragm. The diaphragm is provided with an annular recess in the circular opening of the support pad, which forms an annular downward arch on the bottom surface of the diaphragm. The radius of the arc surface of the annular recess is 3~5mm. A protruding post is fixed at the center of the diaphragm for pushing the oil volume adjustment swing device in the pumping chamber.

2. The carburetor manual diaphragm assembly according to claim 1, characterized in that, The support pad and the diaphragm are provided with through holes at intervals around their periphery, and the through holes correspond to the threaded holes on the upper port connection end face of the oil extraction chamber.

3. The carburetor manual diaphragm assembly according to claim 1 or 2, characterized in that, The support pad is glued and fixed to the diaphragm.

4. The carburetor manual diaphragm assembly according to claim 1 or 2, characterized in that, An upper pressure plate is provided on the upper side of the diaphragm, and a lower pressure plate is provided on the lower side of the diaphragm. The protrusion passes through the lower pressure plate, the diaphragm, and the upper pressure plate in sequence from bottom to top and is connected and fixed.

5. The carburetor manual diaphragm assembly according to claim 4, characterized in that, Both the upper and lower pressure plates are circular, with the diameter of the upper pressure plate being smaller than that of the lower pressure plate, and the lower pressure plate having a hollowed-out portion.

6. The carburetor manual diaphragm assembly according to claim 4, characterized in that, The diameter of the section through which the protrusion protrudes from the upper pressure plate is smaller than the diameter of the section located below the lower pressure plate, and the upper and lower pressure plates are clamped and anchored to the diaphragm through the protrusion.

7. The carburetor manual diaphragm assembly according to claim 1, characterized in that, The thickness of the support pad is 0.8~1.5mm, the thickness of the diaphragm is 0.1~0.2mm, and the height of the annular recess arching downwards is 1~1.5mm.

8. The carburetor manual diaphragm assembly according to claim 1 or 7, characterized in that, The support pad is made of asbestos material, and the diaphragm is made of nitrile rubber, PVC, or PTFE material.

9. The carburetor manual diaphragm assembly according to claim 1, 2, 5, 6 or 7, characterized in that, A pressure cap is provided on the upper side of the diaphragm for pressing against the upper port connection end face of the oil extraction chamber. The pressure cap has an upward arched portion, and an elastic button for driving the protrusion is installed in the middle of the arched portion.

10. The carburetor manual diaphragm assembly according to claim 9, characterized in that, The elastic button includes a cylindrical tube passing through the central through hole of the arched part. The lower end of the cylindrical tube has an annular flange for limiting its position on the inner end face of the pressure cap and pushing the upper end of the protruding post. A retaining spring is installed on the upper end of the cylindrical tube. A limiting pad is sleeved on the cylindrical tube below the retaining spring. A compression spring is sleeved on the cylindrical tube between the limiting pad and the upper end face of the pressure cap.

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