Connecting structure of plunger and connecting rod in plunger pump

Abstract

A connecting structure of a plunger and a connecting rod in a plunger pump comprises a crankshaft, the plunger and the connecting rod connected between the crankshaft and the plunger, the plunger is connected with the connecting rod through a pin, the pin is in clearance fit with the plunger, the connecting rod comprises two connecting arms which are integrated and arranged up and down, and the connecting arms are connected with the connecting rod. Penetrating holes for the pin to penetrate in are machined in the two connecting arms, the hole diameter of the penetrating holes is larger than the diameter of the pin, positioning grooves are further machined in the two connecting arms, locking rings are arranged at the positioning grooves, and axial sliding of the pin is limited through the locking rings. The pin is in clearance fit with the connecting rod, and meanwhile, the axial slippage of the pin is limited through the locking ring, so that the pin is not easy to fall off in the working process of the plunger pump, and is convenient to disassemble during overhaul and maintenance.

Description

Technical Field

[0001] The utility model relates to a connection structure between a plunger and a connecting rod in a plunger pump. Background Art

[0002] In a plunger pump, the most common connection method between the plunger and the connecting rod is pin connection. There is a clearance fit between the pin and the plunger, and an interference fit between the pin and the connecting rod to prevent the pin from falling off. This connection method has disadvantages in the later use and maintenance of the plunger pump. The main disadvantages are that the pin is easy to fall off during the operation of the plunger pump if the interference is too small, and it is difficult to disassemble the pin and the connecting rod during later disassembly and maintenance if the interference is too large. Summary of the invention

[0003] In view of the shortcomings existing in the above problems, the utility model provides a connection structure between a plunger and a connecting rod in a plunger pump.

[0004] To achieve the above-mentioned purpose, the utility model provides a connection structure between a plunger and a connecting rod in a plunger pump, comprising a crankshaft, a plunger and a connecting rod connected between the crankshaft and the plunger, the plunger and the connecting rod are connected by a pin, the pin and the plunger are clearance-fitted, the connecting rod comprises two integral connecting arms arranged one above the other, the two connecting arms are machined with through holes for the pin to penetrate, the aperture of the through holes is larger than the diameter of the pin, the two connecting arms are also machined with positioning grooves and locking rings are arranged at the positioning grooves to limit the axial slippage of the pin through the locking ring.

[0005] Furthermore, the locking ring has a positioning portion cooperating with the positioning groove and a deformation portion formed between the two positioning portions, and the length of the positioning portion is smaller than the length of the positioning groove.

[0006] Furthermore, the shape of the deformation portion is semicircular or elliptical.

[0007] Furthermore, there is an eccentricity between the connecting end of the crankshaft and the connecting rod and the rotation centerline of the crankshaft.

[0008] Furthermore, a rolling bearing is arranged at the connecting end of the crankshaft and the connecting rod.

[0009] The beneficial effects of the utility model compared with the prior art are as follows: a clearance fit is also adopted between the pin and the connecting rod, and at the same time, the axial slippage of the pin is limited by the locking ring, so that the pin is not easy to fall off during the operation of the plunger pump, and it is convenient to disassemble during inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1It is a three-dimensional diagram of the connection structure between the plunger and the connecting rod in a plunger pump of the utility model;

[0011] Figure 2 This is a cross-sectional view of a connection structure between a plunger and a connecting rod in a plunger pump of the utility model;

[0012] Figure 3 The utility model discloses an exploded view of a connection structure between a plunger and a connecting rod in a plunger pump.

[0013] In the figure: 1, crankshaft; 2, connecting rod; 21, connecting arm; 211, through hole; 212, positioning groove; 3, pin; 4, locking ring; 41, positioning part; 42, deformation part; 5, plunger. DETAILED DESCRIPTION

[0014] like Figure 1 , Figure 2 and Figure 3 As shown, a connection structure of a plunger and a connecting rod in a plunger pump according to an embodiment of the utility model comprises a crankshaft 1, a plunger 5 and a connecting rod 2 connected between the crankshaft 1 and the plunger 5, the plunger 5 and the connecting rod 2 are connected by a pin 3, the pin 3 and the plunger 5 are clearance-fitted, the connecting rod 2 comprises two integral connecting arms 21 arranged one above the other, the two connecting arms 21 are machined with a through hole 211 for the pin 3 to penetrate, the aperture of the through hole 211 is larger than the diameter of the pin 3, the two connecting arms 21 are also machined with a positioning groove 212 and are positioned at the positioning groove 212. A locking ring 4 is arranged at the groove 212 to limit the axial slip of the pin 3 through the locking ring 4; the locking ring 4 has a positioning portion 41 that cooperates with the positioning groove 212 and a deformation portion 42 formed between the two positioning portions 41, the length of the positioning portion 41 is slightly smaller than the length of the positioning groove 212, and the width of the positioning portion 41 is slightly smaller than the groove width of the positioning groove 212; the shape of the deformation portion 42 is semicircular or elliptical; there is an eccentricity between the connecting end of the crankshaft 1 and the connecting rod 2 and the rotation center line of the crankshaft 1; a rolling bearing is arranged at the connecting end of the crankshaft 1 and the connecting rod 2.

[0015] The pin and the connecting rod also adopt a clearance fit. At the same time, the axial slip of the pin is limited by the locking ring. During the operation of the plunger pump, the pin is not easy to fall off, and it is convenient to disassemble during inspection and maintenance.

[0016] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use;

[0017] The shape of the locking ring is designed according to the shape of the connecting rod, so that all kinds of irregular shaped connecting rods can be locked by matching locking rings. The locking ring has a certain elasticity, such as Figure 1When locking, the deformed parts on both sides of the lock ring do not contact the connecting rod, and the upper and lower positioning parts of the lock ring lock the position of the pin. When disassembly is required, press the deformed parts on both sides to make the upper and lower positioning parts of the lock ring stretch and leave the position of the positioning groove, then the lock ring can be removed and the pin can be removed.

[0018] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A connection structure between a plunger and a connecting rod in a plunger pump, comprising a crankshaft (1), a plunger (5), and a connecting rod (2) connected between the crankshaft (1) and the plunger (5), wherein the plunger (5) and the connecting rod (2) are connected via a pin (3), and there is a clearance fit between the pin (3) and the plunger (5), characterized in that: The connecting rod (2) comprises two integral connecting arms (21) arranged one above the other. The two connecting arms (21) are provided with through holes (211) for the pin (3) to pass through. The diameter of the through holes (211) is larger than the diameter of the pin (3). The two connecting arms (21) are also provided with positioning grooves (212) and locking rings (4) are arranged at the positioning grooves (212) so as to limit the axial slippage of the pin (3) through the locking rings (4).

2. The connection structure between the plunger and the connecting rod in a plunger pump according to claim 1, characterized in that: The locking ring (4) comprises a positioning portion (41) cooperating with the positioning groove (212) and a deformation portion (42) formed between the two positioning portions (41); the length of the positioning portion (41) is smaller than the length of the positioning groove (212).

3. The connection structure between the plunger and the connecting rod in a plunger pump according to claim 2, characterized in that: The shape of the deformation portion (42) is semicircular or elliptical.

4. The connection structure between the plunger and the connecting rod in a plunger pump according to claim 3, characterized in that: There is an eccentricity between the connection end of the crankshaft (1) and the connecting rod (2) and the rotation center line of the crankshaft (1).

5. The connection structure between the plunger and the connecting rod in a plunger pump according to claim 4, characterized in that: A rolling bearing is arranged at the connection end between the crankshaft (1) and the connecting rod (2).

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