Wear-resistant plunger

Abstract

The utility model discloses a wear-resistant plunger which comprises a plunger rod, a first connecting plunger block is fixed at the bottom end of the plunger rod, a second connecting plunger block is fixed at the bottom end of the first connecting plunger block, and a third connecting plunger block is fixed at the bottom end of the second connecting plunger block. A plunger friction ring is arranged between the third connecting plunger block and the first connecting plunger block, the two ends of the plunger friction ring are attached to each other to form a cylinder which surrounds the second connecting plunger block, and a plurality of positioning clamping grooves are distributed in the outer surface of the second connecting plunger block in a circular array mode. An elastic supporting piece is connected to the inner side of the positioning clamping groove in a clamped mode. The plunger friction ring has the advantages that when the plunger friction ring is abraded and a gap exists between the plunger friction ring and a matched component of the plunger, the plunger friction ring is extruded outwards through the elastic supporting piece and the internal supporting piece, so that the plunger friction ring is attached to the inner surface of the matched component of the plunger all the time.

Description

Technical Field

[0001] The utility model relates to the technical field of plungers, in particular to a wear-resistant plunger. Background Art

[0002] A plunger is a mechanical component whose basic structure consists of a movable plug and a plunger sleeve. It is usually used to control the flow of fluid or provide thrust. It has different names and functions in different applications. For example, it is called a cylinder plunger in an oil cylinder and is used in mining and forestry machinery. In addition, the plunger can also be used in the injection pump of an aircraft engine, and its up and down movement is controlled by the rotation of the camshaft.

[0003] However, in the prior art, the plunger is a solid integral structure. When the plunger is worn during use, a gap appears between the plunger and the supporting components, resulting in a decrease in the sealing performance of the plunger. The plunger needs to be replaced as a whole, which has a high replacement cost. Utility Model Content

[0004] The technical problem to be solved by the utility model is.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A wear-resistant plunger comprises a plunger rod, a first connecting plunger block is fixed to the bottom end of the plunger rod, a second connecting plunger block is fixed to the bottom end of the first connecting plunger block, a third connecting plunger block is fixed to the bottom end of the second connecting plunger block, a plunger friction ring is provided between the third connecting plunger block and the first connecting plunger block, the two ends of the plunger friction ring fit together to form a cylinder and surround the second connecting plunger block, a plurality of positioning slots are distributed in a circular array on the outer surface of the second connecting plunger block, an elastic support member is clamped on the inner side of the positioning slot, an internal support sheet is fixed to the outer surface of the elastic support member, and the internal support sheet fits the inner surface of the plunger friction ring.

[0007] Preferably, the plunger friction ring is made of spring steel and has an outer surface electroplated with a wear-resistant coating, and both end faces of the plunger friction ring are inclined surfaces.

[0008] Preferably, the inclined surface at the end of the plunger friction ring is tangent to the inner wall of the plunger friction ring, and the end surface of the plunger friction ring is smooth and free of burrs.

[0009] Preferably, the elastic support member includes two symmetrically distributed W-shaped support members, and the ends of the two W-shaped support members are attached to each other and fixed by welding.

[0010] Preferably, an elastic inner support rod is fixed to the end and the inner side of the end of the W-shaped support member, one end of the elastic inner support rod is curved in an arc shape, and the W-shaped support member and the elastic inner support rod are both made of spring steel.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] When the plunger friction ring is worn and a gap appears between it and the plunger's supporting component, the plunger friction ring is squeezed outward by the elastic support part and the internal support sheet, so that the plunger friction ring always fits with the inner surface of the plunger's supporting component. The plunger does not need to be replaced during the service life of the plunger friction ring, thereby extending the service life of the plunger and reducing the replacement cost of the plunger. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a structural cross-sectional view of the first connecting plunger block of the utility model;

[0015] Figure 3 It is a cross-sectional schematic diagram of the second connecting plunger block of the utility model;

[0016] Figure 4 This is a schematic structural diagram of the elastic support member of the utility model.

[0017] In the figure: 1. plunger rod; 2. first connecting plunger block; 3. third connecting plunger block; 4. plunger friction ring; 5. second connecting plunger block; 6. positioning slot; 7. internal support plate; 8. elastic support member; 81. W-shaped support member; 82. elastic inner support rod. DETAILED DESCRIPTION

[0018] The following further describes specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the descriptions of these embodiments are intended to aid understanding of the present invention and do not constitute limitations on the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0019] like Figures 1 to 3As shown, a first connecting plunger block 2 is fixed to the bottom end of the plunger rod 1, a second connecting plunger block 5 is fixed to the bottom end of the first connecting plunger block 2, a third connecting plunger block 3 is fixed to the bottom end of the second connecting plunger block 5, and a plunger friction ring 4 is provided between the third connecting plunger block 3 and the first connecting plunger block 2. The two ends of the plunger friction ring 4 fit together to form a cylinder and surround the second connecting plunger block 5. A plurality of positioning grooves 6 are distributed in a circular array on the outer surface of the second connecting plunger block 5, and an elastic support member 8 is clamped on the inner side of the positioning groove 6. An internal support sheet 7 is fixed to the outer surface of the elastic support member 8, and the internal support sheet 7 fits the inner surface of the plunger friction ring 4. The plunger friction ring 4 is supported from the inside of the plunger friction ring 4 by the internal support sheet 7 and the elastic support member 8, ensuring that the outer surface of the plunger friction ring 4 is always in contact with the inner surface of the matching component of the plunger.

[0020] As the preferred technical solution of this embodiment, the plunger friction ring 4 is made of spring steel and has a wear-resistant coating electroplated on its outer surface. Both end faces of the plunger friction ring 4 are beveled, and the beveled surface at the end of the plunger friction ring 4 is tangent to the inner wall of the plunger friction ring 4. The end face of the plunger friction ring 4 is smooth and has no burrs, ensuring that there will be no gap after the two ends of the plunger friction ring 4 are fitted together, and when the plunger friction ring 4 is supported from the inside, the two ends of the plunger friction ring 4 can always remain fitted together.

[0021] As the preferred technical solution of this embodiment, Figure 4 As shown, the elastic support member 8 includes two symmetrically distributed W-shaped support members 81, the ends of the two W-shaped support members 81 are fitted together and fixed by welding, and the ends of the W-shaped support members 81 and the inner sides thereof are fixed with elastic inner support rods 82, one end of the elastic inner support rods 82 is curved in an arc shape, and the W-shaped support members 81 and the elastic inner support rods 82 are both made of spring steel. The elastic support member 8 composed of the elastic W-shaped support member 81 and the elastic inner support rods 82 can apply a force to the internal support sheet 7 directed toward the plunger friction ring 4, so that the internal support sheet 7 always fits the plunger friction ring 4 and squeezes the plunger friction ring 4 outward, thereby ensuring that the plunger friction ring 4 always fits the inner surface of the supporting component of the plunger.

[0022] Working principle: When the plunger is in use, the plunger friction ring 4 is bent and surrounded on the outside of the second connecting plunger block 5, and the two ends of the plunger friction ring 4 are fitted together, and then the plunger friction ring 4 is squeezed toward the second connecting plunger block 5, so that the elastic support 8 is contracted. After the diameter of the plunger friction ring 4 is shrunk, the plunger consisting of the plunger rod 1, the first connecting plunger block 2, the third connecting plunger block 3, the plunger friction ring 4, and the second connecting plunger block 5 is installed inside the matching component. After the plunger is installed, the elastic support 8 elastically recovers and applies a force to the internal support sheet 7 pointing to the plunger friction ring 4. At this time, the internal support sheet 7 pushes the plunger from the inside of the plunger friction ring 4. The friction ring 4 applies a pressure directed toward the inner surface of the supporting component, so that the diameter of the plunger friction ring 4 gradually increases and fits against the inner surface of the supporting component. During the use of the plunger, the plunger friction ring 4 is worn due to long-term friction, resulting in a gap between the plunger friction ring 4 and the inner surface of the supporting component. Since the elastic support member 8 applies pressure to the plunger friction ring 4 from the inside of the plunger friction ring 4 through the internal support sheet 7, the inner diameter of the plunger friction ring 4 increases and ensures that the outer surface of the plunger friction ring 4 continues to fit against the inner surface of the supporting component. The plunger does not need to be replaced during the service life of the plunger friction ring 4, thereby extending the service life of the plunger and reducing the replacement cost of the plunger.

[0023] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A wear-resistant plunger, comprising a plunger rod (1), characterized in that: A first connecting plunger block (2) is fixed to the bottom end of the plunger rod (1), a second connecting plunger block (5) is fixed to the bottom end of the first connecting plunger block (2), a third connecting plunger block (3) is fixed to the bottom end of the second connecting plunger block (5), a plunger friction ring (4) is provided between the third connecting plunger block (3) and the first connecting plunger block (2), the two ends of the plunger friction ring (4) are fitted together to form a cylinder and surround the second connecting plunger block (5), a plurality of positioning slots (6) are distributed in a circular array on the outer surface of the second connecting plunger block (5), an elastic support member (8) is clamped to the inner side of the positioning slot (6), an internal support sheet (7) is fixed to the outer surface of the elastic support member (8), and the internal support sheet (7) fits the inner surface of the plunger friction ring (4).

2. A wear-resistant plunger according to claim 1, characterized in that: The plunger friction ring (4) is made of spring steel and has an outer surface electroplated with a wear-resistant coating. Both end faces of the plunger friction ring (4) are inclined surfaces.

3. A wear-resistant plunger according to claim 2, characterized in that: The inclined surface at the end of the plunger friction ring (4) is tangent to the inner wall of the plunger friction ring (4), and the end surface of the plunger friction ring (4) is smooth and free of burrs.

4. A wear-resistant plunger according to claim 3, characterized in that: The elastic support member (8) comprises two symmetrically distributed W-shaped support members (81), and the ends of the two W-shaped support members (81) are attached to each other and fixed by welding.

5. The wear-resistant plunger according to claim 4, characterized in that: An elastic inner support rod (82) is fixed to the end and the inner side of the end of the W-shaped support member (81), one end of the elastic inner support rod (82) is curved in an arc shape, and the W-shaped support member (81) and the elastic inner support rod (82) are both made of spring steel.

Images