Pump body sealing structure and oil-gas multiphase pump

Abstract

The utility model provides a pump body sealing structure and an oil-gas multiphase pump, the pump body sealing structure comprises a cylinder body, a plunger, a sealing filler, a fixing ring and a connecting pipe, one end of the cylinder body is open; the plunger is in sliding fit with the cylinder body and extends outwards through an opening of the cylinder body. The sealing filler is arranged between the plunger and the cylinder body; the fixing ring is arranged in the sealing filler; the connecting pipe penetrates through the cylinder body and is in threaded connection with the fixing ring. The fixing ring is arranged in the sealing filler and used for being connected with the connecting pipe, so that after oil gas enters the sealing filler due to high pressure, the oil gas can be recycled through the connecting pipe, recycling treatment is facilitated, harmful medium leakage is avoided, and the production environment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of pump body sealing, in particular to a pump body sealing structure and an oil-gas mixed transportation pump. Background Technique

[0002] The oil-gas mixed transportation pump is a special pump body, which is mostly used in the process of petrochemical production. It can ensure the airtight transportation of oil and gas during the production of oil wells, thereby improving the development efficiency. Due to the particularity of its transported medium, it has relatively high requirements for sealing performance.

[0003] The existing utility model patent with the authorization announcement number of CN214836913U discloses a reciprocating oil-gas mixed transportation pump, which includes a power end assembly and a hydraulic end assembly; the hydraulic end assembly includes a pump head body, an installation cavity is arranged inside the pump head body, a valve assembly is installed in the installation cavity, and a piston cylinder liner assembly or a plunger packing box assembly is installed on one side of the valve assembly; the valve assembly includes a valve seat, and an intake valve and a discharge valve arranged in parallel are installed inside the valve seat, and the number of the intake valve and the discharge valve can both be multiple; a medium inlet and a medium outlet communicated with its installation cavity are arranged on the pump head body, the medium inlet is connected with an intake manifold, and the medium outlet is connected with a discharge manifold.

[0004] In the above technical solution, the pump body is sealed by packing. However, when transporting a liquid-phase and gas-phase mixed medium, under the drive of pressure, oil and gas will overflow from the movement gap between the plunger and the sealing packing. When applied to the oilfield environment, the gas contains a large amount of hydrogen sulfide, which is highly poisonous. Therefore, the recovery and treatment of the overflow medium are particularly important; however, the existing pump body does not take relevant measures. Summary of the Utility Model

[0005] In view of this, the utility model provides a pump body sealing structure and an oil-gas mixed transportation pump that can recover and treat the pump body overflow to ensure the safety of the production environment, thereby solving the problem that the existing pump machine cannot recover the overflow.

[0006] The technical solution of the utility model is realized as follows:

[0007] On the one hand, the utility model provides a pump body sealing structure, which includes a cylinder body, a plunger, a sealing packing, a fixing ring and a connecting pipe. Among them,

[0008] One end of the cylinder body is open; the plunger is slidably matched with the cylinder body and extends outward through the opening of the cylinder body;

[0009] The sealing packing is arranged between the plunger and the cylinder body;

[0010] The fixing ring is arranged inside the sealing packing;

[0011] The connecting pipe penetrates through the cylinder body and is threadedly connected with the fixing ring.

[0012] Based on the above technical solutions, preferably, the connecting pipe is used for pumping lubricating oil or discharging lubricating oil.

[0013] Based on the above technical solutions, preferably, two fixing rings are arranged in parallel, and one connecting pipe is arranged on each of the two fixing rings.

[0014] Based on the above technical solutions, preferably, among the two fixing rings, the connecting pipe on one fixing ring is used for pumping lubricating oil, and the connecting pipe on the other fixing ring is used for discharging lubricating oil.

[0015] Based on the above technical solutions, preferably, the sealing packing is of a cylindrical structure, and the fixing ring is of an annular structure;

[0016] The outer wall of the fixing ring is flush with the outer wall of the sealing packing, and the inner diameter of the fixing ring is larger than the inner diameter of the sealing packing.

[0017] Based on the above technical solutions, preferably, a plurality of notches are axially formed on the inner wall of the fixing ring.

[0018] Based on the above technical solutions, preferably, it further includes a gas-liquid separator and a conveying pipeline, wherein,

[0019] The gas-liquid separator is fixedly arranged relative to the cylinder block;

[0020] One end of the conveying pipeline is connected to the connecting pipe, and the other end is connected to the gas-liquid separator.

[0021] Based on the above technical solutions, preferably, the conveying pipeline is a metal pipeline, and a plurality of conveying pipelines are provided. All the plurality of conveying pipelines are connected to the connecting pipe and the gas-liquid separator.

[0022] Based on the above technical solutions, preferably, it further includes a liquid discharge pipeline and an exhaust pipeline, wherein,

[0023] The liquid discharge pipeline is arranged at the bottom end of the gas-liquid separator and is bent to form a self-sealing part;

[0024] The exhaust pipeline is arranged at the top end of the gas-liquid separator.

[0025] On the other hand, the present invention provides an oil-gas mixed transportation pump, including the above-mentioned pump body sealing structure.

[0026] The pump body sealing structure and the oil-gas mixed transportation pump of the present invention have the following beneficial effects compared with the prior art:

[0027] (1) By setting a fixed ring in the sealing packing, which is used to connect the nozzle, after oil and gas enter the sealing packing due to high pressure, they can be recovered through the nozzle for convenient treatment, thus avoiding the leakage of harmful media and protecting the production environment;

[0028] (2) There are two fixed rings. One is used for the input of lubricating oil to achieve forced lubrication, and the other is used for the output of lubricating oil, while discharging the mixed oil and gas together. In this way, the lubrication work of the plunger and the recovery work of harmful media can be realized synchronously;

[0029] (3) A gas-liquid separation device is connected to the nozzle through a delivery pipe, so that the overflowing oil and gas can be separated into gas and liquid, which is beneficial to subsequent recovery and treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 It is a schematic diagram of the pump body sealing structure of the present invention;

[0032] Figure 2 It is the internal structure diagram of the cylinder body of the pump body sealing structure of the present invention;

[0033] Figure 3 It is the connection structure diagram of the sealing packing, fixed ring and nozzle of the pump body sealing structure of the present invention;

[0034] Figure 4 It is a three-dimensional view of the fixed ring of the present invention;

[0035] In the figure: 1. Cylinder body; 2. Plunger; 3. Sealing packing; 4. Fixed ring; 401. Notch; 5. Nozzle; 6. Gas-liquid separator; 7. Delivery pipeline; 8. Drainage pipeline; 81. Self-sealing part; 9. Exhaust pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] AsFigures 1 to 4 As shown in the figure, the pump body sealing structure of the present utility model includes a cylinder block 1, a plunger 2, a sealing packing 3, a fixing ring 4, a connecting pipe 5, a gas-liquid separator 6, a conveying pipeline 7, a drain pipeline 8 and an exhaust pipeline 9;

[0038] The oil-gas mixed transportation pump of the present utility model includes the above-mentioned pump body sealing structure.

[0039] As Figures 1 to 3 shown, one end of the cylinder block 1 is open; the plunger 2 is slidably matched with the cylinder block 1 and extends outward through the opening of the cylinder block 1; the sealing packing 3 is arranged between the plunger 2 and the cylinder block 1; the fixing ring 4 is arranged in the sealing packing 3; the connecting pipe 5 penetrates through the cylinder block 1 and is threadedly connected with the fixing ring 4;

[0040] In the above structure, when working, the plunger 2 is the moving part, which can be used to change the chamber pressure and cooperate with the valve to realize gas-liquid transportation. During this process, the oil-gas medium will enter the sealing packing 3. At this time, the oil-gas medium will gradually move to the fixing ring 4, and the oil-gas can be output through the connecting pipe 5 for recovery treatment;

[0041] This structure sets the fixing ring 4 in the sealing packing 3, which is used to connect the connecting pipe 5. In this way, after the oil-gas enters the sealing packing 3 due to high pressure, it can be recovered through the connecting pipe 5 to facilitate subsequent treatment, thereby avoiding the leakage of harmful media and protecting the production environment.

[0042] Specifically, the connecting pipe 5 is used to pump in or output lubricating oil;

[0043] In the above structure, in some embodiments, the connecting pipe 5 can not only be used to output the lubricating oil carrying the gas-liquid medium, but also be used for the injection of lubricating oil to ensure the stable movement of the plunger 2 and reduce wear.

[0044] As Figure 1 and Figure 2 shown, two fixing rings 4 are arranged in parallel, and a connecting pipe 5 is arranged on each of the two fixing rings 4;

[0045] In the above structure, two fixing rings 4 are arranged and each is provided with a connecting pipe 5, which can realize double oil injection or the discharge of lubricating oil and oil-gas, so as to ensure that the pump body sealing structure has good working conditions and improve the lubrication effect or discharge effect.

[0046] Among the two fixing rings 4, the connecting pipe 5 on one fixing ring 4 is used to pump in lubricating oil, and the connecting pipe 5 on the other fixing ring 4 is used to output lubricating oil;

[0047] In the above structure, two fixing rings 4 are arranged and each is provided with a connecting pipe 5. In this way, one is installed with an oil injection pipe for injecting lubricating oil to play a lubricating role, and the other is used to output lubricating oil and the carried oil-gas medium.

[0048] As Figure 2 shown, the sealing packing 3 is in a cylindrical structure, and the fixing ring 4 is in an annular structure; the outer wall of the fixing ring 4 is flush with the outer wall of the sealing packing 3, and the inner diameter of the fixing ring 4 is larger than the inner diameter of the sealing packing 3;

[0049] In the above structure, the outer wall of the fixing ring 4 is flush with the outer wall of the sealing packing 3, which facilitates the connection of the connecting pipe 5, and the inner diameter is larger than that of the sealing packing 3, so as to prevent the fixing ring 4 from blocking the sealing packing 3, enabling the lubricating oil and the oil and gas medium entering due to high pressure to move normally and ensuring the lubrication or output effect;

[0050] Meanwhile, in this structure, the fixing ring 4 is connected to the connecting pipe 5, and the axial positioning of the fixing ring 4 and the sealing packing 3 can be realized by relying on the connecting pipe 5 to ensure the stable position.

[0051] As Figure 4 shown, a plurality of notches 401 are axially formed on the inner wall of the fixing ring 4;

[0052] In the above structure, by forming the notches 401 on the fixing ring 4, the moving efficiency of the lubricating oil and the oil and gas medium in the sealing packing 3 can be further improved, and blockage can be avoided.

[0053] As Figure 1 shown, the gas-liquid separator 6 is fixedly arranged relative to the cylinder block 1; one end of the conveying pipeline 7 is connected to the connecting pipe 5, and the other end is connected to the gas-liquid separator 6;

[0054] In the above structure, by arranging the gas-liquid separator 6 and connecting it to the connecting pipe 5, it can recover and separate the oil and gas medium overflowing through the connecting pipe 5, which improves the convenience of subsequent process treatment.

[0055] Furthermore, the conveying pipeline 7 is a metal pipeline, and a plurality of conveying pipelines 7 are provided. A plurality of conveying pipelines 7 are all connected to the connecting pipe 5 and the gas-liquid separator 6;

[0056] In the above structure, by arranging a plurality of conveying pipelines 7, each conveying pipeline 7 is relatively thin, which facilitates subsequent bending and shaping to adapt to the on-site assembly scenario.

[0057] As Figure 1 shown, the drain pipe 8 is arranged at the bottom end of the gas-liquid separator 6 and is bent to form a self-sealing part 81; the exhaust pipe 9 is arranged at the top end of the gas-liquid separator 6;

[0058] In the above structure, by providing a drain pipe 8 which is used to output the separated oil, an oil storage tank may be provided at the end of the drain pipe 8 to store the oil. To ensure sealing, the drain pipe 8 is bent to form a self-sealing portion 81 which adopts a U-shaped structure to accumulate a part of the oil for self-sealing. The exhaust pipe 9 is used to output the separated gas and is subjected to subsequent treatment by a gas treatment device.

[0059] In some embodiments, a rubber sleeve is sleeved on the cylinder block 1. In this way, after the connecting pipe 5 is tightened, the connecting pipe 5 can abut against the rubber sleeve, which is beneficial to ensuring the sealing at the connection between the connecting pipe 5 and the cylinder block 1.

[0060] In some embodiments, the two fixing rings 4 are provided as an integral structure, that is, on the same fixing ring 4, a plurality of connecting pipes 5 are axially installed.

[0061] In some embodiments, the end of the fixing ring 4 is flush with one end of the sealing packing 3 close to the opening of the cylinder block 1. In this way, after the connecting pipe 5 is removed, a hook can be inserted into the sealing packing 3 to hook the threaded hole of the fixing ring 4 for installing the connecting pipe 5, so as to pull out the fixing ring 4 and the sealing packing 3 simultaneously, which is convenient for disassembly, installation and maintenance.

[0062] Specific implementation steps:

[0063] When the plunger 2 is working, the oil and gas will overflow into the sealing packing 3 due to high pressure. The two fixing rings 4 in the sealing packing 3 and the installed connecting pipes 5 cooperate with each other. The connecting pipe 5 of one fixing ring 4 is used to inject lubricating oil for lubrication to achieve forced lubrication, and the other is used to output the lubricating oil and the overflowed oil and gas.

[0064] The oil and gas output through the connecting pipe 5 will enter the gas-liquid separator 6 through the conveying pipe 7. The separated oil is conveyed through the drain pipe 8, and the gas is conveyed through the exhaust pipe 9 for subsequent treatment.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pump body sealing structure, characterized in that: It comprises a cylinder body (1), a plunger (2), a sealing filler (3), a fixing ring (4) and a connecting pipe (5), wherein: One end of the cylinder (1) is open; The plunger (2) is slidably matched with the cylinder body (1) and extends outward through the opening of the cylinder body (1); The sealing filler (3) is arranged between the plunger (2) and the cylinder body (1); The fixing ring (4) is arranged in the sealing filler (3); The connecting pipe (5) passes through the cylinder body (1) and is screwed together with the fixing ring (4) through threads.

2. The pump body sealing structure according to claim 1, characterized in that: The connecting pipe (5) is used for pumping in or out the lubricating oil.

3. The pump body sealing structure according to claim 1, characterized in that: Two fixing rings (4) are arranged in parallel, and one connecting pipe (5) is arranged on each of the two fixing rings (4).

4. The pump body sealing structure according to claim 3, characterized in that: Of the two fixing rings (4), the connecting pipe (5) on one fixing ring (4) is used for pumping in lubricating oil, and the connecting pipe (5) on the other fixing ring (4) is used for outputting lubricating oil.

5. The pump body sealing structure according to any one of claims 1 to 4, characterized in that: The sealing filler (3) is a cylindrical structure, and the fixing ring (4) is a circular ring structure; The outer wall of the fixing ring (4) is flush with the outer wall of the sealing filler (3), and the inner diameter of the fixing ring (4) is greater than the inner diameter of the sealing filler (3).

6. The pump body sealing structure according to any one of claims 1 to 4, characterized in that: The inner wall of the fixing ring (4) is provided with a plurality of notches (401) along the axial direction.

7. The pump body sealing structure according to any one of claims 1 to 4, characterized in that: It also includes a gas-liquid separator (6) and a delivery pipeline (7), wherein: The gas-liquid separator (6) and the cylinder body (1) are relatively fixedly arranged; One end of the delivery pipeline (7) is connected to the connecting pipe (5), and the other end is connected to the gas-liquid separator (6).

8. The pump body sealing structure according to claim 7, characterized in that: The delivery pipeline (7) is a metal pipeline, and a plurality of the delivery pipelines (7) are provided, and the plurality of delivery pipelines (7) are all connected to the connecting pipe (5) and the gas-liquid separator (6).

9. The pump body sealing structure according to claim 8, characterized in that: It also includes a liquid discharge pipe (8) and an exhaust pipe (9), wherein: The liquid discharge pipe (8) is arranged at the bottom end of the gas-liquid separator (6) and is bent to form a self-sealing portion (81); The exhaust pipe (9) is arranged at the top end of the gas-liquid separator (6).

10. An oil-gas mixed transport pump, characterized in that: It comprises a pump body sealing structure as described in any one of claims 1 to 9.

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