A plunger pump

Abstract

The present invention discloses a plunger pump, comprising a split frame and a liquid cylinder part installed on one side of the split frame, wherein a plurality of independent power systems are installed in the split frame; the power system comprises a crank-connecting rod mechanism, wherein the crank-connecting rod mechanism is connected to a plunger combination mechanism through a tappet, wherein a group of suction and discharge valve assemblies cooperating with the plunger combination mechanism are arranged at the end of the plunger combination mechanism, wherein the suction and discharge valve assemblies are installed in a cavity of the liquid cylinder part and are located at the upper and lower sides of the end of the plunger combination mechanism, and are respectively connected with a suction pipeline and a discharge pipeline of the liquid cylinder part; and a sealed dustproof and oil-emulsifying proof device is installed at the slideway port of the split frame, so that when the tappet performs a linear reciprocating motion, impurities such as dust and sand in the environment cannot follow the movement of the tappet into the frame, thereby ensuring the reliability of the lubricating oil and increasing the service life of the device.

Description

Technical Field

[0001] The invention relates to the field of oil field oil production and water injection equipment, in particular to a plunger pump. Background Art

[0002] At present, with the continuous development and expansion of major oil fields, secondary oil recovery water injection technology is widely used. With the development of oil fields, the water injection volume and water injection pressure are constantly increasing. Conventional pumps can no longer meet the requirements of oil field water injection technology due to performance and cost reasons. The oil field market urgently needs a new type of plunger pump that can meet the requirements of water injection volume and water injection pressure, while meeting the requirements of energy saving and consumption reduction, and comprehensively considering the user's later operating costs and maintenance operability. Summary of the invention

[0003] In view of the above defects or shortcomings, an object of the present invention is to provide a plunger pump.

[0004] To achieve the above purpose, the technical solution of the present invention is:

[0005] A plunger pump comprises a split frame and a cylinder part installed on one side of the split frame, wherein a plurality of independent power systems are installed in the split frame; the power system comprises a crank-connecting rod mechanism, wherein the crank-connecting rod mechanism is connected to a plunger combination mechanism via a tappet, wherein a group of suction and discharge valve assemblies cooperating with the plunger combination mechanism are arranged at the end of the plunger combination mechanism, wherein the suction and discharge valve assemblies are installed in a cavity of the cylinder part and are located at the upper and lower sides of the end of the plunger combination mechanism, and are respectively connected to the suction pipeline and the discharge pipeline of the cylinder part, and during operation, the suction and discharge valve assemblies are opened or closed according to the suction and discharge strokes; a sealed dustproof and oil-emulsifying proof device is installed at the slide port of the split frame, wherein one end of the tappet is connected to the crank-connecting rod mechanism, and the other end is connected to the plunger combination mechanism through the sealed dustproof and oil-emulsifying proof device.

[0006] The crank-connecting rod mechanism comprises a crankshaft installed at one end of a split frame, a connecting rod is installed on the crankshaft, the connecting rod is connected to a tappet, the crankshaft rotates to drive the connecting rod to convert circular motion into linear motion, and the connecting rod drives the tappet to perform linear reciprocating motion.

[0007] The end of the connecting rod is connected to the tappet through a cross pin.

[0008] The sealed dust and oil emulsification proof device comprises a sealing body and a tappet seal in contact with the tappet, wherein the tappet seal is sleeved in the sealing body and the outer edge thereof extends out of the sealing body; the sealing body and the tappet seal are fixedly mounted at the slideway port via a pressure plate.

[0009] The outer edge of the tappet seal is a sloped structure, and the diameter of the tappet seal is smaller than the outer diameter of the tappet. When the tappet performs linear reciprocating motion, the tappet seal and the tappet maintain an interference fit state.

[0010] The tappet seal is made of polytetrafluoroethylene.

[0011] The suction and discharge valve assembly includes a valve seat, a valve cover is installed on the valve seat, a slidable valve plate is installed between the valve seat and the valve cover, a flow channel is opened on the top of the valve cover, and a spring is installed in the valve cover; when the plunger pump is in the suction stroke, the valve plate of the suction valve assembly in the suction and discharge valve assembly jumps up, so that the spring is compressed, and a gap is maintained between the valve plate and the valve seat sealing surface, and the suction valve assembly is in an open state, so that the conveying medium passes through the suction pipeline and the suction valve assembly and finally enters the liquid cylinder part and the stuffing box cavity, and the discharge valve assembly in the suction and discharge valve assembly is in a closed state; when the plunger pump is in the discharge stroke, the valve plate of the discharge valve assembly in the suction and discharge valve assembly jumps up, so that the spring is compressed, and the valve plate maintains a distance from the valve seat sealing surface, and the discharge valve assembly is in an open state, so that the conveying medium passes through the discharge valve assembly and the liquid cylinder part and finally enters the discharge pipeline, thereby realizing the medium conveying, and at this time, the suction valve assembly in the suction and discharge valve assembly is in a closed state.

[0012] A corrugated elastic pad is installed between the valve seat and the valve cover.

[0013] The plunger combination mechanism includes a positioning sleeve fixedly installed with the cylinder member, a stuffing box is installed on the positioning sleeve through a clamping nut, a cavity is provided in the center of the positioning sleeve and the stuffing box, a plunger is provided in the cavity, an oil baffle is installed on the inner wall of the clamping nut, and a stuffing, a spacer ring, a guide sleeve, a spring in the sleeve, and a spring seat are installed on the inner wall of the stuffing box.

[0014] The split frame comprises a frame lower shell and a frame upper cover connected to the frame lower shell via positioning pins and fixing bolts.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The present invention provides a plunger pump, which is equipped with a sealed dust-proof and oil-proof emulsification device at the slide port of a split frame. When the tappet is performing linear reciprocating motion, the sealed dust-proof and oil-proof emulsification device and the tappet always maintain an interference fit state, which prevents dust, sand and other impurities in the environment from entering the frame along with the movement of the tappet. Secondly, the tappet seal in the sealed dust-proof and oil-proof emulsification device can automatically clean crystals formed by medium splashing onto the tappet, thereby ensuring the reliability of the lubricating oil and increasing the service life of the device.

[0017] Furthermore, in the present invention, the tappet seal is made of non-metallic material, which can reduce the wear on the tappet surface during operation and increase the service life of the tappet.

[0018] Furthermore, the valve assembly is a modular structure, and the suction and discharge valves are universal, which can effectively shorten the production cycle of the valve group and reduce the types of spare parts reserves for users; the valve plate is made of non-metallic polymer material, which meets the strength of the valve plate while reducing the weight of the valve plate, so that the impact of the valve plate on the valve seat during operation is reduced, effectively improving the service life of the valve group and reducing noise pollution; the valve plate is produced using one-time molding technology, which effectively improves production efficiency. The non-metallic polymer material has good corrosion resistance to oilfield produced water, and at the same time has a suitable hardness difference with the valve seat, which improves the service life of the valve seat.

[0019] Furthermore, the split frame consists of a frame lower shell and a frame upper cover. During the maintenance of the new plunger pump, the frame upper cover can be directly dismantled and lifted and removed, and the crosshead, connecting rod and other components can be directly repaired and replaced without removing the crankshaft, etc. Compared with the integral frame, the maintenance difficulty and workload are greatly reduced, and the purpose of human-machine harmony is achieved; the design and manufacturing of the split frame meet the requirements of generalization and serialization, and is interchangeable. The frame lower shell and the frame upper cover can be repaired and replaced individually, which greatly extends the service life of the frame and reduces the user's use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the plunger pump of the present invention;

[0021] Figure 2 is a top view of the plunger pump of the present invention;

[0022] Figure 3 Schematic diagram of the structure of the tappet sealing dust and oil emulsification prevention device of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the valve assembly of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the plunger combination mechanism of the present invention.

[0025] In the figure, 1—fixing bolt; 2—locating pin; 3—frame lower shell; 4—bearing; 5—crankshaft; 6—connecting rod; 7—crosshead pin; 8—frame upper cover; 9—tappet; 10—sealing dust and oil emulsification protection device; 11—plunger combination mechanism; 12—suction and discharge valve assembly; 13—14—intake pipeline; 15—pressure cover bolt; 16—pressure cover; 10-1—sealing body; 10-2—Yx seal; 10-3—pressure plate. 10-4—tappet seal; 11-1—plunger; 11-2—oil retaining pad; 11-3—pressure nut; 11-4—guide sleeve; 11-5—packing; 11-6—spacer ring; 11-7—guide sleeve; 11-8—spring in sleeve; 11-9—spring seat; 11-10—stuffing box; 11-12—thread plug; 11-13—positioning sleeve; 12-1—valve seat; 12-2—corrugated elastic pad; 12-3—valve plate; 12-4—valve cover; 12-5—spring. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0027] like Figure 1 , 2 As shown, the present invention provides a plunger pump, including a split frame and a cylinder part 13 installed on one side of the split frame, wherein a plurality of independent power systems are installed in the split frame; the power system includes a crank-connecting rod mechanism, wherein the crank-connecting rod mechanism is connected to a plunger assembly mechanism 11 through a tappet 9, wherein a group of suction and discharge valve assemblies 12 cooperating with the plunger assembly mechanism 11 are arranged at the end of the plunger assembly mechanism 11, wherein the suction and discharge valve assemblies 12 are installed in the cavity of the cylinder part 13, and are located at the upper and lower sides of the end of the plunger assembly mechanism 11, and are respectively connected to the suction pipeline 14 and the discharge pipeline of the cylinder part 13, and during operation, the suction and discharge valve assemblies 12 are opened or closed according to the suction and discharge strokes; a sealed dustproof and oil-emulsifying device 10 is installed at the slideway port of the split frame, wherein one end of the tappet 9 is connected to the crank-connecting rod mechanism, and the other end passes through the sealed dustproof and oil-emulsifying device 10 and is connected to the plunger assembly mechanism 11

[0028] The crank-connecting rod mechanism includes a crankshaft 5 installed at one end of the split frame, a connecting rod 6 is installed on the crankshaft 5, and the connecting rod 6 is connected to the tappet 9. The crankshaft 5 rotates to drive the connecting rod 6 to convert the circular motion into linear motion, and the connecting rod 6 drives the tappet 9 to perform linear motion. Specifically, the end of the connecting rod 6 is connected to the tappet 9 through a cross pin 7. The crankshaft 5 is installed and connected to the split frame through a bearing, and a power input device is connected to the crankshaft 5, which serves as the power end of the plunger pump.

[0029] like Figure 3 As shown, the sealing dust and oil emulsification prevention device 10 includes a sealing body 10-1 and a tappet seal 10-4 in contact with the tappet 9. The tappet seal 10-4 is sleeved in the sealing body 10-1, and the outer edge extends out of the sealing body 10-1; the sealing body 10-1 and the tappet seal 10-4 are fixedly installed at the slideway port through a pressure plate 10-3. Preferably, the outer edge of the tappet seal 10-4 is a slope structure, and the diameter of the tappet seal 10-4 is smaller than the outer diameter of the tappet 9. When the tappet 9 is performing a linear reciprocating motion, the tappet seal 10-4 and the tappet 9 maintain an interference fit state. Among them, a Yx seal 10-2 is also installed on the sealing body 10-1.

[0030] The push rod seal 10-4 is installed in the sealing body 10-1 and is partially exposed outside the sealing body 10-1. The front end of the push rod seal 10-4 is designed with a reasonable slope and its size is smaller than the outer diameter of the push rod. When the push rod 9 is performing linear reciprocating motion, the push rod seal 10-4 and the push rod 9 always maintain an interference fit state. This state prevents dust, sand and other impurities in the environment from entering the frame with the push rod movement. Secondly, the push rod seal 10-4 can automatically clean the crystals formed by the medium splashing onto the push rod to ensure the reliability of the lubricating oil. Preferably, the push rod seal 10-4 is made of non-metallic material. For example, the present invention is processed with polytetrafluoroethylene, so that the wear on the surface of the push rod 9 can be reduced during operation, thereby improving the service life of the push rod.

[0031] Specifically, if Figure 4As shown, the suction and discharge valve assembly 12 includes a valve seat 12-1, a valve cover 12-4 is installed on the valve seat 12-1, a slidable valve plate 12-3 is installed between the valve seat 12-1 and the valve cover 12-4, a flow channel is opened on the top of the valve cover 12-4, and a spring 12-5 is installed in the valve cover 12-4. A corrugated elastic pad 12-2 is installed between the valve seat 12-1 and the valve cover 12-4. Among them, the valve plate 12-3 is made of non-metallic polymer material, which meets the strength of the valve plate while reducing the weight of the valve plate, so that the impact of the valve plate on the valve seat during operation is reduced, the service life of the valve group is effectively improved, and noise pollution is reduced. In addition, the valve plate 12-3 is produced by one-time molding technology, which effectively improves production efficiency. The non-metallic polymer material has good corrosion resistance to oilfield produced water, and at the same time has a suitable hardness difference with the valve seat 12-1, which improves the service life of the valve seat. When the plunger pump is in the suction stroke, the valve plate 12-3 of the suction valve assembly in the suction and discharge valve assembly 12 jumps up, compressing the spring 12-5, maintaining a gap between the valve plate 12-3 and the sealing surface of the valve seat 12-1, and the suction valve assembly is in an open state, so that the conveying medium passes through the suction pipeline 14 and the suction valve assembly, and finally enters the liquid cylinder part 13 and the stuffing box cavity, and the discharge valve assembly in the suction and discharge valve assembly 12 is in a closed state; when the plunger pump is in the discharge stroke, the valve plate 12-3 of the discharge valve assembly in the suction and discharge valve assembly 12 jumps up, compressing the spring 12-5, maintaining a gap between the valve plate 12-3 and the sealing surface of the valve seat 12-1, and the discharge valve assembly is in an open state, so that the conveying medium passes through the discharge valve assembly and the liquid cylinder part 13, and finally enters the discharge pipeline, realizing the medium transportation, and at this time, the suction valve assembly in the suction and discharge valve assembly 12 is in a closed state.

[0032] like Figure 5 As shown, preferably, the plunger assembly mechanism 11 includes a positioning sleeve 11-13 fixedly mounted with the liquid cylinder part 13, a stuffing box 11-10 is mounted on the positioning sleeve 11-13 through a clamping nut 11-3, a cavity is provided in the center of the positioning sleeve 11-13 and the stuffing box 11-10, a plunger 11-1 is arranged in the cavity, an oil retaining ring 11-2 is installed on the inner wall of the clamping nut 11-3, a stuffing 11-5, a spacer ring 11-6, a guide sleeve 11-7, a sleeve inner spring 11-8, a spring seat 11-9, and a stuffing box 11-10 are installed on the inner wall of the stuffing box 11-10, a screw plug 11-12 is arranged at the end of the plunger 11-1; the end of the plunger 11-1 and the liquid cylinder part 13 are fixedly sealed by a gland. The top of the liquid cylinder part 13 is also fixed by a gland and a gland bolt 15.

[0033] Preferably, the split frame includes a frame lower shell 3 and a frame upper cover 8 connected to the frame lower shell 3 by positioning pins 2 and fixing bolts 1. The split frame is composed of the frame lower shell 3 and the frame upper cover 8. During the maintenance of the plunger pump, the frame upper cover can be directly dismantled and hoisted, and the crosshead pin 7, connecting rod 6 and other parts can be directly repaired and replaced without removing the crankshaft 5, etc. Compared with the integral frame, the maintenance difficulty and workload are greatly reduced, and the purpose of human-machine harmony is achieved; the design and manufacture of the split frame meet the requirements of generalization and serialization, and are interchangeable. The frame lower shell and the frame upper cover can be repaired and replaced individually, which greatly extends the service life of the frame and reduces the user's use cost.

[0034] The working process and principle of the present invention are:

[0035] The crankshaft 5 performs circular motion under the drive of the power, driving the movable connecting rod 6 to convert the circular motion into linear motion, the connecting rod 6 drives the tappet 9 to perform linear reciprocating motion, and then drives the plunger assembly mechanism to extend and retract, and the plunger assembly mechanism works on the medium. In the suction stroke of the plunger pump, the suction valve assembly valve plate 12-3 in the suction and discharge valve assembly 12 jumps to compress the spring 12-5, and the valve plate 12-3 maintains a certain distance from the sealing surface of the valve seat 12-1, and the suction valve assembly is in an open state, so that the conveying medium passes through the suction pipeline 14 and the suction valve assembly, and finally enters the liquid cylinder. Part 13 and the stuffing box cavity, at this time, the discharge valve assembly in the suction and discharge valve assembly 12 is in a closed state; in the discharge stroke of the plunger pump, the discharge valve assembly valve plate 12-3 in the suction and discharge valve assembly 12 jumps to compress the spring 12-5, and the valve plate 12-3 maintains a certain distance from the sealing surface of the valve seat 12-1, and the discharge valve assembly is in an open state, so that the conveying medium passes through the discharge valve assembly and the cylinder part 13 and finally enters the discharge pipeline, thereby achieving the purpose of conveying the medium. At this time, the suction valve assembly in the suction and discharge valve assembly 12 is in a closed state, completing the working process of the plunger pump.

[0036] It is obvious to those skilled in the art that the above-mentioned specific examples are only preferred embodiments of the present invention. Therefore, the improvements and changes that may be made by those skilled in the art to certain parts of the present invention still embody the principles of the present invention and achieve the purpose of the present invention, and all belong to the scope of protection of the present invention.

Claims

1. A plunger pump, characterized in that: The invention comprises a split frame and a liquid cylinder (13) installed on one side of the split frame, wherein a plurality of mutually independent power systems are installed in the split frame; the power system comprises a crank connecting rod mechanism, wherein the crank connecting rod mechanism is connected to a plunger assembly mechanism (11) via a tappet (9), wherein a group of suction and discharge valve assemblies (12) matching with the plunger assembly mechanism (11) are arranged at the end of the plunger assembly mechanism (11), wherein the suction and discharge valve assemblies (12) are installed in the cavity of the liquid cylinder (13), and are located at the upper and lower sides of the end of the plunger assembly mechanism (11), and are respectively connected to the suction pipeline (14) and the discharge pipeline of the liquid cylinder (13), and during operation, the suction and discharge valve assemblies (12) are arranged according to the suction and discharge operation. The split frame is provided with a sealed dustproof and oil-proof emulsification device (10) at the slideway port, one end of the tappet (9) is connected to the crank-connecting rod mechanism, and the other end passes through the sealed dustproof and oil-proof emulsification device (10) and is connected to the plunger combination mechanism (11); the crank-connecting rod mechanism comprises a crankshaft (5) mounted on one end of the split frame, a connecting rod (6) is mounted on the crankshaft (5), the connecting rod (6) is connected to the tappet (9), the crankshaft (5) rotates to drive the connecting rod (6) to convert circular motion into linear motion, and the connecting rod (6) drives the tappet (9) to perform linear reciprocating motion; the sealed dustproof and oil-proof emulsification device (10) comprises a sealing body (10-1) and a sealing body (10-2) connected to the split frame. A tappet seal (10-4) in contact with the tappet (9), the tappet seal (10-4) being sleeved in a sealing body (10-1) and having an outer edge extending out of the sealing body (10-1); the sealing body (10-1) and the tappet seal (10-4) being fixedly mounted at a slideway port via a pressure plate (10-3); the outer edge of the tappet seal (10-4) being an inclined surface structure, and the diameter of the tappet seal (10-4) being smaller than the outer diameter of the tappet (9); when the tappet (9) is performing a linear reciprocating motion, the tappet seal (10-4) and the tappet (9) are in an interference fit state; the suction and discharge valve assembly (12) comprising a valve seat (12-1), on which a valve cover (12-1) is mounted. -4), a slidable valve plate (12-3) is installed between the valve seat (12-1) and the valve cover (12-4), a flow channel is opened on the top of the valve cover (12-4), and a spring (12-5) is installed in the valve cover (12-4); when the plunger pump is in the suction stroke, the suction valve assembly valve plate (12-3) in the suction and discharge valve assembly (12) jumps up, so that the spring (12-5) is compressed, and the valve plate (12-3) and the valve seat (12-1) sealing surface maintain a gap, and the suction valve assembly is in an open state, so that the conveying medium passes through the suction pipeline (14), the suction valve assembly, and finally enters the liquid cylinder (13) and the stuffing box cavity, and the discharge valve assembly in the suction and discharge valve assembly (12) is in a closed state;When the plunger pump is in the discharge stroke, the valve plate (12-3) of the discharge valve assembly in the suction and discharge valve assembly (12) jumps up to compress the spring (12-5), and the valve plate (12-3) keeps a distance from the sealing surface of the valve seat (12-1). The discharge valve assembly is in an open state, so that the conveying medium passes through the discharge valve assembly and the cylinder (13) and finally enters the discharge pipeline to realize the conveying of the medium. At this time, the suction valve assembly in the suction and discharge valve assembly (12) is in a closed state. ; 2. The plunger pump according to claim 1, characterized in that: The end of the connecting rod (6) is connected to the tappet (9) via a cross pin (7).

3. The plunger pump according to claim 1, characterized in that: The tappet seal (10-4) is made of polytetrafluoroethylene.

4. The plunger pump according to claim 1, characterized in that: A corrugated elastic pad (12-2) is installed between the valve seat (12-1) and the valve cover (12-4).

5. The plunger pump according to claim 1, characterized in that: The plunger assembly mechanism (11) comprises a positioning sleeve (11-13) fixedly mounted on the cylinder member (13); a stuffing box (11-10) is mounted on the positioning sleeve (11-13) via a clamping nut (11-3); a cavity is provided at the center of the positioning sleeve (11-13) and the stuffing box (11-10); a plunger (11-1) is arranged in the cavity; an oil retaining ring (11-2) is mounted on the inner wall of the clamping nut (11-3); and a stuffing box (11-5), a spacer ring (11-6), a guide sleeve (11-7), a spring in the sleeve (11-8), and a spring seat (11-9) are mounted on the inner wall of the stuffing box (11-10).

6. The plunger pump according to any one of claims 1 to 4, characterized in that: The split frame comprises a frame lower shell (3) and a frame upper cover (8) connected to the frame lower shell (3) via positioning pins (2) and fixing bolts (1).

Images