Small-clearance oil-gas multiphase pump piston structure

Abstract

The utility model discloses a small-clearance oil-gas multiphase pump piston structure, and belongs to the technical field of reciprocating pumps. The piston is characterized by comprising a piston body and reinforcing sections arranged at the two ends of the piston body, the two end faces of the piston body are fixedly connected with the reinforcing sections on the corresponding sides respectively, mounting holes are formed in the middle of the piston body and the middles of the two reinforcing sections, and annular flanges are arranged on the end faces, away from the piston body, of the reinforcing sections. The annular flange is in a ring shape coaxial with the piston body. According to the small-clearance oil-gas multiphase pump piston structure, the annular flange is arranged on the end face of the piston body and matched with the groove in the end face of the pump cavity, media sucked into the pump cavity can be discharged to the maximum extent, the clearance volume of an oil-gas multiphase pump is reduced to the minimum, the volume efficiency of the pump is effectively improved, the performance map of the pump is optimized, and the service life of the pump is prolonged. The adaptability of the pump to the medium gas content is enhanced, the on-site matching condition of the pump and an oil well is improved, and in addition, due to the existence of the reinforcing section and the annular flange, the structure of the piston body is strengthened.

Description

Technical Field

[0001] The invention discloses a small clearance oil-gas mixed pump piston structure, belonging to the technical field of reciprocating pumps. Background Art

[0002] What is extracted from oil wells during oil extraction is not pure oil, but a mixture of various substances such as oil, natural gas, water, solid particles, etc. These oil and gas mixtures need to be transported to the joint station through pipelines using oil and gas mixed transmission pumps, and then the oil and gas are separated and purified.

[0003] Oil and gas gathering and transportation requires very high delivery pressure, and usually a motorized reciprocating pump is used as an oil and gas mixed delivery pump. When the traditional oil and gas mixed delivery pump is working, there is a large clearance volume, which seriously affects the working performance and medium adaptability of the pump. When the gas content of the transported medium increases, the working efficiency decreases, and when the gas content of the transported medium is too high, the medium cannot be discharged. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a small clearance oil-gas mixed pump piston structure which greatly reduces the clearance volume, effectively improves the volumetric efficiency of the pump and strengthens the piston body.

[0005] The technical solution adopted by the utility model to solve the technical problem is: the small clearance oil and gas mixed delivery pump piston structure is characterized in that it includes a piston body and reinforcement sections arranged at both ends of the piston body, the two end surfaces of the piston body are respectively fixedly connected with the reinforcement sections on the corresponding sides, mounting holes are arranged in the middle of the piston body and the middle of the two reinforcement sections, and an annular flange is arranged on the end surface of each reinforcement section ring away from the piston body, and the annular flange is a ring coaxial with the piston body, so that when the piston is in the extreme position, it can achieve gapless cooperation with the grooves on the end surfaces of both sides of the pump cavity, thereby reducing the clearance volume of the pump.

[0006] Preferably, the reinforcement section includes an inner tube, an outer tube, an inner sealing cover and an outer sealing cover. The outer tube is coaxially sleeved outside the inner tube and spaced apart from the inner tube, and an annular cavity is formed between the inner tube and the outer tube. The inner sealing cover and the outer sealing cover respectively seal the two ends of the annular cavity. The inner sealing cover is fixedly connected to the piston body, and an annular flange is arranged on the outer sealing cover.

[0007] Preferably, the reinforcement section comprises a front reinforcement section and a rear reinforcement section, the mounting hole of the front reinforcement section is a through hole, and the mounting hole on the rear reinforcement section is a blind hole.

[0008] Preferably, the inner wall of the rear reinforcement section is provided with threads, and a threaded portion is formed on the inner wall of the rear reinforcement section.

[0009] Preferably, the mounting hole of the front reinforcement section is a stepped hole.

[0010] Preferably, the outer diameter of the piston body is larger than the outer diameter of the reinforcement sections on both side sections.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] An annular flange is arranged on the end face of the piston body of the small clearance oil and gas mixed pump piston structure, which cooperates with the groove on the end face of the pump cavity to discharge the medium sucked into the pump cavity to the maximum extent, reduces the clearance volume of the oil and gas mixed pump to the minimum, effectively improves the volumetric efficiency of the pump, optimizes the performance spectrum of the pump, enhances the adaptability of the pump to the gas content of the medium, and improves the on-site matching conditions between the pump and the oil well; in addition, due to the existence of the reinforcement section and the annular flange, the structure of the piston body is strengthened. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the front cross-section of the piston structure of a small clearance oil-gas mixed pump.

[0014] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0015] In the figure: 1, piston rod; 101, boss; 2, piston body; 3, front reinforcement section; 301, tongue and groove; 4, inner sealing cover; 5, outer sealing cover; 501, annular flange; 6, rear reinforcement section; 601, threaded portion. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with specific embodiments. However, people familiar with the art should understand that the detailed description given here in conjunction with the drawings is for better explanation, and the structure of the present invention necessarily exceeds these limited embodiments. For some equivalent replacement schemes or common means, they are no longer described in detail herein, but still fall within the scope of protection of the present application.

[0017] Figures 1-2 It is the best embodiment of the utility model, and the following Figures 1-2 The utility model is further described.

[0018] A small clearance oil and gas mixed pump piston structure includes a piston body 2 and reinforcement sections arranged at both ends of the piston body 2. The two end surfaces of the piston body 2 are fixedly connected to the reinforcement sections on the corresponding sides respectively. Mounting holes are arranged in the middle of the piston body 2 and the middle of the two reinforcement sections. An annular flange 501 is arranged on the end surface of each reinforcement section away from the piston body 2. The annular flange 501 is coaxial with the piston body 2. The end surface of the piston body 2 of the small clearance oil and gas mixed pump piston structure is provided with an annular flange 501. Cooperating with the groove on the end surface of the pump cavity, the medium sucked into the pump cavity can be discharged to the maximum extent, and the clearance volume of the oil and gas mixed pump is reduced to the minimum, which effectively improves the volumetric efficiency of the pump. In addition, the reinforcement section also increases the service life of the piston body 2. The small clearance oil and gas mixed pump piston structure is used for a double-acting oil and gas mixed pump.

[0019] Specific: such as Figure 1-2 As shown: the piston body 2 is cylindrical, a mounting hole is coaxially arranged in the middle of the piston body 2, and the reinforcement section includes a front reinforcement section 3 arranged on the left side of the piston body 2 and a rear reinforcement section 6 arranged on the right side of the piston body 2.

[0020] The structures of the front reinforcement section 3 and the rear reinforcement section 6 are similar. In this embodiment, the structure of the front reinforcement section 3 is taken as an example to explain the structures of the front reinforcement section 3 and the rear reinforcement section 6.

[0021] The front reinforcement section 3 includes an inner tube, an outer tube, an inner sealing cover 4 and an outer sealing cover 5. The outer tube is coaxially sleeved outside the inner tube, and the inner tube and the outer tube are spaced apart to form an annular cavity between the inner tube and the outer tube. The inner sealing cover 4 and the outer sealing cover 5 are respectively arranged at both ends of the outer tube. The inner sealing cover 4 and the outer sealing cover 5 are both in the shape of circular rings, and the inner sealing cover 4 and the outer sealing cover 5 are fixedly connected to the corresponding ends of the inner tube and the outer tube at the same time, and can be connected by welding or screws, and the two ends of the annular cavity are closed.

[0022] The inner diameter of the left end of the front reinforcing section 3 is larger than that of the right end, and a tongue 301 is formed at the left end of the mounting hole of the front reinforcing section 3. One end of the inner cylinder of the rear reinforcing section 6 is closed, and the inner wall of the inner cylinder of the rear reinforcing section 6 is provided with threads, so that the mounting hole of the rear reinforcing section 6 is a blind hole with an open left end, and a threaded cloth 601 is formed in the mounting hole of the rear reinforcing section 6.

[0023] An annular flange 501 is disposed on the outer side of each outer sealing cover 5 , and the annular flange 501 is coaxially disposed with the piston body 2 .

[0024] When the piston structure of the small clearance oil-gas mixed pump is installed on the piston rod 1, a boss 101 is provided on the piston rod 1, and a thread is provided on the outer wall of the right end of the piston rod 1. The right end of the piston rod 1 passes through the mounting hole of the front reinforcement section 3 and the mounting hole of the piston body 2 in sequence, and then extends into the mounting hole of the rear reinforcement section 6. The right end of the piston rod 1 is threadedly connected with the threaded portion 601 of the rear reinforcement section 6, and the boss 101 is positioned in the groove 301.

[0025] Furthermore, sealing rings are provided between the piston rod 1 and the front reinforcement section 3 and between the piston body 2 and the piston rod 1 to seal between the piston rod 1 and the front reinforcement section 3 and between the piston rod 1 and the piston body 2 .

[0026] Annular grooves matching with the annular flange 501 are arranged on both end faces of the pump chamber of the oil-gas mixed flow pump. When the piston moves in the direction close to the groove, the annular flange 501 matches with the annular groove of the pump chamber, so that all the medium in the pump chamber is discharged, and the clearance volume of the oil-gas mixed flow pump is reduced to a minimum, thereby effectively improving the volumetric efficiency of the pump.

[0027] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A small clearance oil-gas mixed pump piston structure, characterized in that: The invention comprises a piston body (2) and reinforcement sections arranged at both ends of the piston body (2); the two end surfaces of the piston body (2) are respectively fixedly connected to the reinforcement sections on the corresponding sides; mounting holes are arranged in the middle of the piston body (2) and in the middle of the two reinforcement sections; an annular flange (501) is arranged on the end surface of each reinforcement section away from the piston body (2); the annular flange (501) is annular and coaxial with the piston body (2).

2. The small clearance oil-gas mixed pump piston structure according to claim 1 is characterized in that: The reinforcement section comprises an inner cylinder, an outer cylinder, an inner sealing cover (4) and an outer sealing cover (5); the outer cylinder is coaxially sleeved outside the inner cylinder and spaced apart from the inner cylinder, and an annular cavity is formed between the inner cylinder and the outer cylinder; the inner sealing cover (4) and the outer sealing cover (5) respectively seal the two ends of the annular cavity; the inner sealing cover (4) is fixedly connected to the piston body (2); and an annular flange (501) is arranged on the outer sealing cover (5).

3. The small clearance oil-gas mixed pump piston structure according to claim 1 or 2, characterized in that: The reinforcement section comprises a front reinforcement section (3) and a rear reinforcement section (6); the mounting hole of the front reinforcement section is a through hole, and the mounting hole on the rear reinforcement section (6) is a blind hole.

4. The small clearance oil-gas mixed pump piston structure according to claim 3 is characterized in that: The inner wall of the rear reinforcement section (6) is provided with a thread, and a threaded portion (601) is formed on the inner wall of the rear reinforcement section (6).

5. The small clearance oil-gas mixed pump piston structure according to claim 3 is characterized in that: The mounting hole of the front reinforcement section (3) is a stepped hole.

6. The small clearance oil-gas mixed pump piston structure according to claim 1 is characterized in that: The outer diameter of the piston body (2) is larger than the outer diameter of the reinforcement sections on both sides.

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