An eccentric rotary multiphase oil-gas mixed delivery pump

Abstract

The present invention discloses an eccentric rotary multiphase oil-gas mixed delivery pump, which adopts a design in which the bearing chamber and the medium chamber are completely separated. An eccentric rotor is arranged inside the pump body, which is mounted on a shaft and driven by a key. The shaft and the housing are concentric, and the rotor forms a crescent cavity inside the pump body. An isolation plate is passed through the housing to form a close contact with the rotating eccentric rotor to form an elastic seal, forming a low-pressure cavity and a high-pressure cavity. The eccentric rotor sleeve is also formed with the housing in the circumferential direction to form a seal, avoiding the situation in which internal leakage occurs in the low-pressure cavity and the high-pressure cavity. The pump solves the problem of the difficulty in achieving mixed delivery of crude oil, natural gas, water and various viscous substances through a single pipeline; it can achieve zero emission and zero pollution in oil wells; the pump has a simple mechanical structure, a correct principle, is easy to manufacture, and is easy to maintain. The low operating speed can achieve zero noise and zero pollution, and can achieve random variable operation, and can be used for a long time in harsh environments.

Description

Technical Field

[0001] The invention belongs to power machinery and relates to a delivery pump, in particular to an eccentric rotary multiphase oil-gas mixed delivery pump. Background Art

[0002] At present, in my country's oil industry, it is difficult to achieve multi-phase mixed transportation of crude oil, natural gas, water, silt, flocs and various viscous substances in a single pipeline, resulting in a large amount of duplicate construction, repeated investment, and serious environmental pollution and waste of social resources caused by casing gas emissions.

[0003] In order to solve the multiphase mixed transportation problem in oil and natural gas production, improve asset utilization, reduce construction investment, realize oil well casing gas recovery, avoid air pollution, and save social resources, finding new multiphase mixed transportation devices is one of the topics that technicians in this field are concerned about.

[0004] In the prior art, the rotor shaft of a multiphase oil-gas mixture delivery pump is eccentric, and a bearing is installed between the rotor shaft and the rotor sleeve. The low-pressure chamber and the high-pressure chamber are formed by the bearing support and the rotation of the multiphase oil-gas mixture delivery pump. However, since the bearings are subjected to the impact force of the eccentric rotor, the seal is prone to failure during use of the pump, resulting in corrosive media entering the bearing cavity, and the bearing lubrication condition deteriorates. As a result, the bearings are easily damaged, and the shortest lifespan is even less than one month.

[0005] In the prior art, the rotor of a multiphase oil-gas mixture delivery pump is hinged to an isolation plate, and the rotor performs eccentric rotation and swing. This structure cannot achieve high-speed operation, and the small eccentricity results in a large pump volume. Summary of the Invention

[0006] In view of the technical problems or defects existing in the above-mentioned prior art, the purpose of the present invention is to provide an eccentric rotary multiphase oil-gas mixed delivery pump, so as to prevent the pump from being damaged during use and ensure that the pump can always operate at high performance.

[0007] In order to achieve the above tasks, the present invention adopts the following technical solutions:

[0008] An eccentric rotary multiphase oil-gas mixed delivery pump, comprising a pump body, characterized in that an eccentric rotor is provided inside the pump body, the eccentric rotor being mounted on a shaft and driven by a flat key, and the shaft and the eccentric rotor being fastened by a nut, the shaft being concentric with the inner hole of the pump body so that the pump body and the eccentric rotor form a crescent cavity, and the eccentric rotor is tangent to the inner wall of the pump body at 360 degrees;

[0009] An isolation plate is provided at the top of the pump body. The isolation plate passes through the square groove of the pump body and is tangent to the eccentric rotor, dividing the medium cavity inside the pump body into a high-pressure cavity and a low-pressure cavity. The upper cover provided on the pump body isolates the medium cavity from the outside world; a first pipe joint is provided on the upper cover, and the first pipe joint is connected to the oil pipe, the one-way valve, the oil pipe, the second pipe joint in sequence, and finally connected to the outlet end of the pump body; a spring is provided between the upper cover and the isolation plate. When the eccentric rotor rotates in the pump body, the spring always gives a pre-tightening force to the isolation plate to ensure that the isolation plate and the eccentric rotor of the pump body are always tangent to each other within a certain pressure, so that the isolation plate, the eccentric rotor and the pump body are sealed; a pressure relief groove is provided on the isolation plate. When installed, the pressure relief groove faces the outlet end. When a certain pressure is formed at the inlet and outlet of the pump body, the outlet medium enters the top of the pump body through the second joint, the second oil pipe, the one-way valve, the first oil pipe, the first joint, and the upper cover, forming a certain pressure on the isolation plate radially, ensuring that the isolation plate is always in contact with the eccentric rotor during the continuous increase in the pressure difference between the inlet and outlet of the pump body.

[0010] According to the present invention, a front flange is installed at the protruding end of the shaft on one side of the pump body, and a rear flange is installed at the protruding end of the shaft on the other side of the pump body. Gaps are left between the front flange, the rear flange and the two ends of the eccentric rotor. Seals and sealing covers are provided at the front flange, the rear flange and the shaft rotating part to isolate the pressurized medium cavity from the outside world. A bearing seat, a bearing and a front cover are provided on the front flange. Similarly, a bearing seat, a bearing and a front cover are provided on the rear flange. The bearing and the medium cavity are separately arranged. When the seal fails or a problem occurs, the medium will not contaminate the bearing.

[0011] Specifically, the eccentric rotor is provided with a plurality of circular holes or special-shaped holes.

[0012] The eccentric rotary multiphase oil and gas mixed delivery pump of the present invention adopts a design in which the bearing chamber is completely separated from the medium chamber. The eccentric rotor can dynamically separate the inner chamber of the shell into high-pressure and low-pressure chambers to achieve the purpose of regulating the pressure and flow at the input and output ends. The rotor performs eccentric rotation in the shell. During the movement of the rotor, the rotor always maintains line contact with the inner wall of the shell at any time, completing the process of converting the size of the cavity and the process of exchanging the medium inside the cavity. By completely separating the bearing chamber from the medium chamber, leakage caused by seal failure or other reasons will not contaminate the bearing chamber, solving the problem of difficult single-pipeline mixed delivery of crude oil, natural gas, water and various viscous substances; it can achieve zero emission and pollution in oil wells; the mechanical structure is simple, easy to manufacture and maintain, low noise and pollution-free, and can be used for a long time in harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the eccentric rotary multiphase oil-gas mixed delivery pump of the present invention;

[0014] Figure 2 It is a cross-sectional view of the pump volume chamber;

[0015] Figure 3 It is a schematic diagram of an eccentric rotor;

[0016] The marks in the figure represent: 1, shaft, 2, front cover, 3, bearing, 4, bearing seat, 5, front flange, 6, sealing cover, 7, seal, 8, pump body, 9, isolation plate, 10, eccentric rotor, 11, spring, 12, upper cover, 13, nut, 14, rear flange, 15, rear cover, 16, flat key, 17, first pipe joint, 18, oil pipe, 19, one-way valve, 20, oil pipe, 21, second pipe joint.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0018] See also Figure 1-Figure 3 This embodiment provides an eccentric rotary multiphase oil-gas mixed pump, comprising a pump body 8, an eccentric rotor 10 disposed within the pump body 8, the eccentric rotor 10 being mounted on a shaft 1 and driven by a flat key 16, with a nut 13 fastening the shaft 1 and the eccentric rotor 10. The shaft 1 is concentric with the inner hole of the pump body 8, so that the pump body 8 and the eccentric rotor 10 form a crescent cavity, and the eccentric rotor 10 is tangent to the inner wall of the pump body 8 at 360 degrees.

[0019] An isolation plate 9 is provided at the top of the pump body 8. The isolation plate 9 passes through the square groove of the pump body 8 and is tangent to the eccentric rotor 10, dividing the medium cavity inside the pump body 8 into a high-pressure cavity and a low-pressure cavity. The upper cover 12 provided on the pump body 8 isolates the medium cavity from the outside; a first pipe joint 17 is provided on the upper cover 12, and the first pipe joint 17 is connected to the oil pipe 18, the one-way valve 19, the oil pipe 20, the second pipe joint 21 in sequence, and finally connected to the outlet end of the pump body 8; a spring 11 is provided between the upper cover 12 and the isolation plate 9. When the eccentric rotor 10 rotates in the pump body 8, the spring 11 always gives the isolation plate 9 a pre-tightening force to ensure that the isolation plate 9 and the eccentric rotor 10 of the pump body 8 are always tangent within a certain pressure, so that the isolation plate 9 and the eccentric rotor 10 and the pump body 8 are sealed; a pressure relief groove is provided on the isolation plate 9. When installed, the pressure relief groove faces the outlet end. When the pump body 8 inlet and outlet ( Figure 2 When a certain pressure is formed (the left flange is the inlet and the right flange is the outlet), the medium at the outlet end enters the top of the pump body 8 through the second joint 21, the second oil pipe 20, the one-way valve 19, the first oil pipe 18, the first joint 17, and the upper cover 12, forming a certain pressure on the isolation plate 9 in the radial direction, ensuring that the isolation plate 9 is always in contact with the eccentric rotor 10 during the process of the pressure difference between the inlet and outlet ends of the pump body 8 constantly increasing.

[0020] In this embodiment, a front flange 5 is installed at the protruding end of the shaft 1 on one side of the pump body 8, and a rear flange 14 is installed at the protruding end of the shaft 1 on the other side of the pump body 8. There is a gap between the front flange 5 and the rear flange 14 and the two ends of the eccentric rotor 10. A seal 7 and a sealing cover 6 are provided at the front flange 5 and the rear flange 14 and the rotating part of the shaft 1 to isolate the pressurized medium cavity from the outside. A bearing seat 4, a bearing 3 and a front cover 2 are provided on the front flange 5. Similarly, a bearing seat 4, a bearing 3 and a front cover 15 are provided on the rear flange 14. The bearing 3 and the medium cavity are separately provided. When the seal 7 fails or has problems, the medium will not be contaminated

[0021] The eccentric rotor 10 is provided with a plurality of circular holes or special-shaped holes ( Figure 3 The purpose is to reduce the weight of the eccentric rotor 10 and to achieve static balance of the eccentric rotor 10.

[0022] The eccentric rotary multiphase oil-gas mixed delivery pump provided in this embodiment adopts a design in which the bearing chamber and the medium chamber are completely separated. An eccentric rotor is provided inside the pump body. The eccentric rotor is mounted on a shaft and driven by a key. The shaft and the housing are concentric. The rotor forms a crescent cavity inside the pump body. An isolation plate is used to pass through the housing and closely contact the rotating eccentric rotor to form an elastic seal, forming a low-pressure chamber and a high-pressure chamber. The eccentric rotor sleeve is also sealed with the housing in the circumferential direction to avoid internal leakage of the low-pressure chamber and the high-pressure chamber. This solves the problem of mixed delivery of crude oil, natural gas, water, and various viscous substances through a single pipeline. It can achieve zero emission and zero pollution in oil wells. The mechanical structure is simple, the principle is correct, it is easy to manufacture and maintain, the low operating speed can achieve noise and pollution-free operation, it can achieve random variable operation, and it can be used for a long time in harsh environments.

Claims

1. An eccentric rotary multiphase oil-gas mixed delivery pump, comprising a pump body (8), characterized in that: An eccentric rotor (10) is provided inside the pump body (8). The eccentric rotor (10) is mounted on the shaft (1) and is driven by a flat key (16). The shaft (1) and the eccentric rotor (10) are fastened by a nut (13). The shaft (1) and the inner hole of the pump body (8) are concentric, so that the pump body (8) and the eccentric rotor (10) form a crescent cavity, and the eccentric rotor (10) and the inner wall of the pump body (8) are tangent at 360 degrees. An isolation plate (9) is provided at the top of the pump body (8). The isolation plate (9) passes through the square groove of the pump body (8) and is tangent to the eccentric rotor (10), dividing the medium cavity inside the pump body (8) into a high-pressure cavity and a low-pressure cavity. An upper cover (12) provided on the pump body (8) isolates the medium cavity from the outside. A first pipe joint (17) is provided on the upper cover (12). The first pipe joint (17) is connected to the first oil pipe (18), the one-way valve (19), the second oil pipe (20), the second pipe joint (21) in sequence, and finally connected to the outlet end of the pump body (8). A spring (11) is provided between the upper cover (12) and the isolation plate (9). When the eccentric rotor (10) rotates in the pump body (8), the spring (11) always gives the isolation plate (9) a sense of pressure. ) pre-tightening force is provided to ensure that the isolation plate (9) and the eccentric rotor (10) of the pump body (8) are always tangent to each other within a certain pressure, so that a seal is achieved between the isolation plate (9), the eccentric rotor (10) and the pump body (8); a pressure relief groove is provided on the isolation plate (9), and the pressure relief groove faces the outlet end when installed. When a certain pressure is formed at the inlet and outlet of the pump body (8), the outlet end medium enters the top of the pump body (8) through the second pipe joint (21), the second oil pipe (20), the one-way valve (19), the first oil pipe (18), the first pipe joint (17), and the upper cover (12), forming a certain pressure on the isolation plate (9) in the radial direction, ensuring that the isolation plate (9) is always in contact with the eccentric rotor (10) during the process of the pressure difference between the inlet and outlet ends of the pump body (8) constantly increasing; A front flange (5) is installed at the protruding end of the shaft (1) on one side of the pump body (8), and a rear flange (14) is installed at the protruding end of the shaft (1) on the other side of the pump body (8). Gaps are left between the front flange (5), the rear flange (14) and the two ends of the eccentric rotor (10). A seal (7) and a sealing gland (6) are provided between the front flange (5) and the rear flange (14) and the rotating part of the shaft (1) to isolate the pressurized medium cavity from the outside. A bearing seat (4), a bearing (3) and a front cover (2) are provided on the front flange (5). Similarly, a bearing seat (4), a bearing (3) and a rear cover (15) are provided on the rear flange (14). The bearing (3) and the medium cavity are separately provided. When there is a problem with the seal (7), the medium will not contaminate the bearing (3). The eccentric rotor (10) is provided with a plurality of circular holes or special-shaped holes.

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