Reciprocating plunger pump capable of preventing crack of sliding channel

Abstract

The utility model relates to a reciprocating plunger pump capable of preventing track breakage. According to the technical scheme, the front end of a crosshead is connected to a plunger in a pump head through a middle rod, the crosshead moves in an inner cavity of a sliding sleeve, an inlaying sleeve is arranged on the inner wall of the sliding sleeve, one end of the inlaying sleeve is provided with a limiting protrusion used for being matched with one end of the sliding sleeve, the other end of the inlaying sleeve is of a cylindrical structure, and the outer diameter of the cylindrical structure is smaller than the inner diameter of the sliding sleeve. The sliding sleeve has the advantages that the insert bush is installed in the sliding sleeve, the insert bush is made of nodular cast iron materials and has high strength, high hardness, good abrasion resistance and good fatigue resistance, the insert bush is provided with the limiting flange used for being matched with the tangent plane of the main body, the left end of the limiting flange is provided with the folded lockrand, and the fixing effect of the insert bush is improved; in addition, a plurality of spiral grooves are distributed on the outer wall of the crosshead main body, so that the lubricating property is better, and the abrasion is reduced; and the service life of the reciprocating plunger pump is prolonged, and the cost of oilfield development is reduced.

Description

Technical Field

[0001] This utility model relates to the field of oilfield plunger pump technology, and in particular to a reciprocating plunger pump with anti-skid rupture. Background Technology

[0002] Reciprocating plunger pumps used in the petroleum industry are key equipment used in oilfield development to inject high-pressure water into oil wells to improve oil production and recovery rates. The slide in the reciprocating plunger pump, as a key support component for the movement of the crosshead, bears complex alternating loads. During long-term operation, the slide is prone to cracking, which can lead to overall damage to the reciprocating plunger pump and seriously affect the normal operation of oilfield development.

[0003] The main reasons for slide rail rupture are as follows: 1. Fatigue load: When the reciprocating piston pump is working, the reciprocating motion of the crosshead causes the slide rail to be subjected to alternating stresses such as tension, compression, and bending. Under long-term action, this leads to material fatigue damage, the initiation of cracks, and gradual expansion to rupture; 2. Poor lubrication: If the lubrication system fails or the lubricating oil quality is poor, the friction coefficient between the slide rail and the crosshead increases, wear intensifies, local stress concentration occurs, and the slide rail rupture is accelerated; 3. Installation and alignment deviation: During the installation of the pump body, if the installation accuracy of the slide rail and other components is not up to standard, such as non-parallel axes or coaxiality deviation, the piston movement will be skewed, resulting in uneven stress and causing the slide rail to rupture.

[0004] Therefore, it is necessary to design a reciprocating plunger pump that is resistant to slippage and breakage, so as to avoid replacing the entire reciprocating plunger pump or scrapping it, which would not only increase costs but also affect the normal operation of oilfield development. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing a reciprocating piston pump with anti-slip groove rupture. By improving the sliding sleeve and crosshead, the service life of the reciprocating piston pump is increased, and the cost of oilfield development is reduced.

[0006] The present invention relates to a reciprocating plunger pump for preventing slippage rupture. The technical solution includes: a housing base (1), a gear shaft (2), a crankshaft (3), a crankshaft cavity (4), a crankcase (5), a crosshead (6), a sliding sleeve (7), a connecting rod (8), an intermediate rod (9), a pump head (11), a plunger (12), a discharge valve assembly (14), and an inlet valve assembly (15). The crankcase (5) is mounted on the housing base (1). The crankcase (5) contains the crankshaft cavity (4) and the gear shaft (2). The crankshaft (3) installed in the crankshaft cavity (4) passes through… The connecting rod (8) connects to the crosshead (6), and the front end of the crosshead (6) is connected to the plunger (12) inside the pump head (11) through the intermediate rod (9). The crosshead (6) moves in the inner cavity of the sliding sleeve (7). The pump head (11) is provided with a drain valve group (14) and an inlet valve group (15). The inner wall of the sliding sleeve (7) is fitted with a sleeve (10). One end of the sleeve (10) is provided with a limiting locking edge (10.1) for cooperating with one end of the sliding sleeve (7). The other end is a cylindrical structure, and the outer diameter of the cylindrical structure is smaller than the inner diameter of the sliding sleeve (7).

[0007] Preferably, the crosshead (6) includes a crosshead body (6.1), a radial pin connection hole (6.2), and a body cross-section (6.5). The crosshead body (6.1) is a cylindrical structure. The two corresponding side walls of the crosshead body (6.1) are respectively provided with body cross-sections (6.5). The radial pin connection hole (6.2) is provided on the body cross-section (6.5). The right end of the pin connecting rod (8) is installed through the radial pin connection hole (6.2).

[0008] Preferably, the inner cavity of the crosshead body (6.1) is provided with two sets of limiting blocks (6.6), which are fixed to the right end of the connecting rod (8) by axial connecting bolts (6.3).

[0009] Preferably, the outer wall of the crosshead body (6.1) is provided with multiple spiral grooves (6.4).

[0010] Preferably, the left end of the connecting rod (8) is connected and fixed to the crankshaft (3) through a semi-circular connecting ring (8.1) and a quick connector (8.2), and the upper and lower ends of the semi-circular connecting ring (8.1) are respectively provided with quick connectors (8.2).

[0011] Preferably, the two side walls of the above-mentioned insert (10) are provided with limiting straight edges (10.2) for cooperating with the main body cut surface (6.5), and the left end of the insert (10) is provided with a folded limiting locking edge (10.1).

[0012] Preferably, the outer end of the pump head (11) is provided with a valve cover (13), and the outer end of the drain valve assembly (14) is provided with a drain nozzle (16).

[0013] The beneficial effects of this utility model are as follows: By installing a bushing inside the sliding sleeve, and the bushing being made of ductile iron, which possesses high strength, high hardness, good wear resistance, and fatigue resistance, and with limiting flanges on both sides of the bushing that mate with the crosshead's cross-section, this structure ensures that the crosshead always moves in one direction and does not rotate. The bushing also has limiting flanges for mates with the crosshead's cross-section, and the left end of the limiting flanges has a folded locking edge, which improves the bushing's fixing effect. In addition, multiple spiral grooves are distributed on the outer wall of the crosshead body, which improves lubrication performance and reduces wear. In summary, this utility model improves the service life of reciprocating plunger pumps and reduces oilfield development costs by improving the sliding sleeve and crosshead. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a structural diagram of the crosshead and connecting rod;

[0016] Figure 3 This is a schematic diagram of the crosshead structure;

[0017] Figure 4 This is a schematic diagram of the side cross-section of the sliding sleeve and the insert;

[0018] Figure 5 This is a schematic diagram of the transverse cross-section of the sliding sleeve and the insert;

[0019] In the above diagram: 1. Housing base; 2. Gear shaft; 3. Crankshaft; 4. Crankshaft cavity; 5. Crankcase; 6. Crosshead; 7. Sliding sleeve; 8. Connecting rod; 9. Intermediate rod; 10. Insert sleeve; 11. Pump head; 12. Plunger; 13. Valve cover; 14. Drain valve assembly; 15. Inlet valve assembly; 16. Outlet nozzle; 6.1. Crosshead body; 6.2. Radial pin connecting hole; 6.3. Axial connecting bolt; 6.4. Spiral groove; 6.5. Body cut surface; 6.6. Limiting stop; 8.1. Semi-circular connecting ring; 8.2. Quick connector; 10.1. Limiting locking edge; 10.2. Limiting straight edge. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Example 1, referring to Figures 1-5This utility model discloses a reciprocating plunger pump with anti-slip track breakage, comprising a housing base 1, a gear shaft 2, a crankshaft 3, a crankshaft cavity 4, a crankcase 5, a crosshead 6, a sliding sleeve 7, a connecting rod 8, an intermediate rod 9, a pump head 11, a plunger 12, a discharge valve assembly 14, and an inlet valve assembly 15. The crankcase 5 is mounted on the housing base 1, and the crankshaft cavity 4 and gear shaft 2 are located within the crankcase 5. The crankshaft 3, mounted in the crankshaft cavity 4, is connected to the gear shaft 2 via the connecting rod 8. The front end of the crosshead 6 is connected to the plunger 12 inside the pump head 11 via the intermediate rod 9. The crosshead 6 moves within the inner cavity of the sliding sleeve 7. The pump head 11 is equipped with a drain valve assembly 14 and an inlet valve assembly 15. The inner wall of the sliding sleeve 7 is fitted with a sleeve 10. One end of the sleeve 10 is provided with a limiting locking edge 10.1 for cooperating with one end of the sliding sleeve 7, and the other end is a cylindrical structure with an outer diameter smaller than the inner diameter of the sliding sleeve 7.

[0022] In addition, the insert 10 is made of ductile iron, which has high strength, high hardness, good wear resistance and fatigue resistance.

[0023] Reference Figure 2 and Figure 3 The crosshead 6 mentioned in this utility model includes a crosshead body 6.1, a radial pin connecting hole 6.2, and a body cross-section 6.5. The crosshead body 6.1 has a cylindrical structure. The body cross-section 6.5 is provided on two corresponding side walls of the crosshead body 6.1. The radial pin connecting hole 6.2 is provided on the body cross-section 6.5. The right end of the pin connecting rod 8 is installed through the radial pin connecting hole 6.2.

[0024] The inner cavity of the crosshead body 6.1 is provided with two sets of limiting blocks 6.6, which are fixed to the right end of the connecting rod 8 by axial connecting bolts 6.3.

[0025] The left end of the connecting rod 8 is connected and fixed to the crankshaft 3 through a semi-circular connecting ring 8.1 and a quick connector 8.2. The upper and lower ends of the semi-circular connecting ring 8.1 are respectively provided with quick connectors 8.2, which can be quickly connected by bolts and nuts.

[0026] Reference Figure 4 and Figure 5 The side walls of the insert 10 mentioned in this utility model are provided with limiting straight edges 10.2 for cooperating with the main body cut surface 6.5. The left end of the insert 10 is provided with a folded limiting locking edge 10.1, which is used to lock the insert 10 to the inner wall of the sliding sleeve 7 and to fix one end.

[0027] The pump head 11 is provided with a valve cover 13 at its outer end, and the drain valve assembly 14 is provided with a drain nozzle 16 at its outer end.

[0028] In use, this utility model involves installing a bushing 10 inside the sliding sleeve 7. The bushing 10 is made of ductile iron, which possesses high strength, high hardness, good wear resistance, and fatigue resistance. Then, the right end of the connecting rod 8 is connected to the crosshead 6 via a pin, with the pin located within the radial pin connection hole 6.2. Two sets of limiting blocks 6.6 are provided within the inner cavity of the crosshead body 6.1, and the right end of the connecting rod 8 is fixed by an axial connecting bolt 6.3. Additionally, the left end of the connecting rod 8 is connected and fixed to the crankshaft 3 via a semi-circular connecting ring 8.1 and a quick-connect fitting 8.2. It should also be noted that the bushing... The two side walls of the sleeve 10 are provided with limiting stops 10.1 that cooperate with the main body cut surface 6.5. This structure can ensure that the crosshead 6 always moves in one direction and will not rotate. Driven by the rotation of the crankshaft 3, the connecting rod 8 drives the crosshead 6 to move back and forth along the insert 10 in the sliding sleeve 7, which in turn drives the intermediate rod 9 and the plunger 12 in the pump head 11 to move back and forth. The back and forth movement of the plunger 12 will drive the one-way liquid inlet valve group 15 to enter the liquid, and then push the liquid to be discharged along the liquid outlet valve group 14 and the liquid outlet 16, forming a high-pressure discharged liquid, thereby realizing high-pressure operations such as oilfield water injection.

[0029] Example 2: A reciprocating plunger pump with anti-slip track breakage mentioned in this utility model includes a housing base 1, a gear shaft 2, a crankshaft 3, a crankshaft cavity 4, a crankcase 5, a crosshead 6, a sliding sleeve 7, a connecting rod 8, an intermediate rod 9, a pump head 11, a plunger 12, a discharge valve assembly 14, and an inlet valve assembly 15. The crankcase 5 is mounted on the housing base 1. The crankshaft cavity 4 and the gear shaft 2 are provided inside the crankcase 5. The crankshaft 3 installed in the crankshaft cavity 4 is connected to the gear shaft 2 by the connecting rod 8. The crosshead 6 is connected to the plunger 12 inside the pump head 11 via the intermediate rod 9. The crosshead 6 moves within the inner cavity of the sliding sleeve 7. The pump head 11 is equipped with a drain valve assembly 14 and an inlet valve assembly 15. The inner wall of the sliding sleeve 7 is fitted with a bushing 10. One end of the bushing 10 is provided with a limiting protrusion 10.1 for engaging with one end of the sliding sleeve 7, and the other end is a cylindrical structure with an outer diameter smaller than the inner diameter of the sliding sleeve 7.

[0030] The difference from Example 1 is:

[0031] The crosshead body 6.1 mentioned in this embodiment has multiple spiral grooves 6.4 distributed on its outer wall, which improves lubrication performance, reduces wear, and increases service life.

[0032] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A reciprocating plunger pump with anti-slip track breakage, comprising a housing base (1), a gear shaft (2), a crankshaft (3), a crankshaft cavity (4), a crankcase (5), a crosshead (6), a sliding sleeve (7), a connecting rod (8), an intermediate rod (9), a pump head (11), a plunger (12), a discharge valve assembly (14), and an inlet valve assembly (15), wherein the crankcase (5) is mounted on the housing base (1), the crankshaft cavity (4) and the gear shaft (2) are provided in the crankcase (5), the crankshaft (3) mounted in the crankshaft cavity (4) is connected to the crosshead (6) through the connecting rod (8), the front end of the crosshead (6) is connected to the plunger (12) in the pump head (11) through the intermediate rod (9), the crosshead (6) moves in the sliding sleeve (7), and the pump head (11) is provided with a discharge valve assembly (14) and an inlet valve assembly (15), characterized in that: The inner wall of the sliding sleeve (7) is provided with a sleeve (10). One end of the sleeve (10) is provided with a limiting locking edge (10.1) for cooperating with one end of the sliding sleeve (7), and the other end is a cylindrical structure, and the outer diameter of the cylindrical structure is smaller than the inner diameter of the sliding sleeve (7).

2. The reciprocating plunger pump with anti-slip track rupture according to claim 1, characterized in that: The crosshead (6) includes a crosshead body (6.1), a radial pin connection hole (6.2), and a body cross-section (6.5). The crosshead body (6.1) is a cylindrical structure. The two corresponding side walls of the crosshead body (6.1) are respectively provided with body cross-sections (6.5). The radial pin connection hole (6.2) is provided on the body cross-section (6.5). The right end of the pin connecting rod (8) is installed through the radial pin connection hole (6.2).

3. A reciprocating plunger pump with anti-slip track rupture according to claim 2, characterized in that: The inner cavity of the crosshead body (6.1) is provided with two sets of limiting blocks (6.6), which are fixed to the right end of the connecting rod (8) by axial connecting bolts (6.3).

4. A reciprocating plunger pump with anti-slip track rupture according to claim 3, characterized in that: Multiple spiral grooves (6.4) are distributed on the outer wall of the crosshead body (6.1).

5. A reciprocating plunger pump with anti-slip track rupture according to claim 1, characterized in that: The left end of the connecting rod (8) is connected and fixed to the crankshaft (3) through a semi-circular connecting ring (8.1) and a quick connector (8.2). The upper and lower ends of the semi-circular connecting ring (8.1) are respectively provided with quick connectors (8.2).

6. A reciprocating plunger pump with anti-slip track rupture according to claim 2, characterized in that: The two side walls of the insert (10) are provided with limiting straight edges (10.2) for cooperating with the main body cut surface (6.5), and the left end of the insert (10) is provided with a folded limiting locking edge (10.1).

7. A reciprocating plunger pump with anti-slip track rupture according to claim 1, characterized in that: The pump head (11) is provided with a valve cover (13) at its outer end, and the drain valve assembly (14) is provided with a drain nozzle (16) at its outer end.

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