Fluid end structure of plugging fluid delivery pump

Abstract

A fluid end structure of a leaking stoppage fluid delivery pump comprises a pump head, a fluid suction pipeline and a fluid drainage pipeline, the pump head comprises a body, a fluid suction valve and a fluid drainage valve, the fluid suction valve and the fluid drainage valve are installed in a fluid suction port and a fluid drainage port in the body respectively, the fluid suction pipeline is communicated with the fluid suction port, the fluid drainage pipeline is communicated with the fluid drainage port, and the fluid drainage valve is communicated with the fluid drainage port. Each of the liquid suction valve and the liquid discharge valve comprises an annular valve seat, an annular sealing seat and an annular guide seat which are coaxially arranged from bottom to top, the lower end of the annular sealing seat is embedded in the upper part of the annular valve seat, the upper end of the annular valve seat is in threaded connection with the annular guide seat, and the upper end of the annular sealing seat is embedded in the annular guide seat; the annular sealing seat is pressed on the upper part of the annular valve seat through the annular guide seat; a valve ball capable of moving up and down and rotating freely is installed in the annular guide seat, and when the valve ball falls to be tightly attached to the upper end of the annular sealing seat, the pump valve is closed. The utility model aims to overcome the defects in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of plugging pumps, and in particular to a hydraulic end structure of a plugging liquid delivery pump. Background Art

[0002] During the oil drilling process, well leakage exists for a long time. In order to ensure the normal progress of the drilling process, it is necessary to inject the plugging liquid into the well through the mud pump to plug the leakage point; the main components of the plugging liquid are: water, sawdust, bentonite, profile adjustment fluid, cotton seeds, walnut skins, stones, etc., among which the walnut skins are the size of a fingernail and the longest stones are 25mm; the existing mud pump valve core and valve seat are sealed by a conical sealing surface. During the working process, after the valve core and valve seat are opened, the above-mentioned debris contained in the plugging liquid is easily attached to the sealing surface. When closed, the sealing surface is easily separated by the debris attached thereto, causing the valve core and valve seat to be unable to be completely closed, so that the mud pump cannot work normally and needs frequent maintenance. Secondly, the suction pipeline of the mud pump is open at one end and closed at the other end. During the plugging liquid transportation process, the impurities contained in the plugging liquid often precipitate and accumulate at the closed end, resulting in the blockage of the pump head inlet near the closed end of the suction pipeline, resulting in poor suction of the plugging liquid. The above problems affect the normal operation of the mud pump and require shutdown for cleaning, which is not only labor-intensive but also reduces the working efficiency of the mud pump. Utility Model Content

[0003] The utility model provides a hydraulic end structure of a plugging liquid delivery pump to overcome the shortcomings of the prior art.

[0004] The technical scheme adopted by the utility model is: a hydraulic end structure of a leak-proof liquid delivery pump, including a pump head, a suction pipeline and a discharge pipeline, the pump head including a body, a suction valve and a discharge valve, the suction valve and the discharge valve are respectively installed in the suction port and the discharge port in the body, the suction pipeline is connected with the suction port, the discharge pipeline is connected with the discharge port, the suction valve and the discharge valve both include an annular valve seat, an annular sealing seat, and an annular guide seat coaxially arranged from bottom to top, the lower end of the annular sealing seat is embedded in the upper part of the annular valve seat, the upper end of the annular valve seat is threadedly connected with an annular guide seat, and the upper end of the annular sealing seat is embedded in the annular guide seat, and the annular sealing seat is pressed onto the upper part of the annular valve seat through the annular guide seat; a valve ball that can move up and down and rotate freely is installed in the annular guide seat, and the pump valve is closed when the valve ball falls and fits tightly against the upper end of the annular sealing seat.

[0005] The closed end of the liquid suction pipeline is connected to the leak-proof liquid tank through a reflux pipeline, and a reflux valve is arranged on the reflux pipeline.

[0006] The closed end of the liquid suction pipeline is also provided with a flushing valve.

[0007] The upper end surface of the annular sealing seat is a conical surface, and the bottom of the conical surface protrudes inward to form a conical sealing surface; the conical angle α of the conical sealing surface is 64°-66°, and the height H is 2-3 mm; when the valve ball falls and fits tightly against the conical sealing surface, the pump valve is closed.

[0008] The upper part of the annular guide seat is evenly distributed with notches, so that a number of symmetrically arranged guide columns are formed on the upper part of the annular guide seat. The cross-section of the guide column is an isosceles triangle structure with the sharp corner facing inward, and the sharp corner is chamfered to form a vertical guide surface, and the vertical guide surface protrudes from the inner diameter of the bottom of the annular guide seat; the valve ball is guided by the vertical guide surface when moving up and down.

[0009] The upper end of the annular sealing seat is embedded in the inner diameter of the bottom of the annular guide seat. The outer diameter of the annular sealing seat is provided with a shoulder, and the lower end of the annular guide seat abuts against the shoulder.

[0010] The annular sealing seat is a non-metallic structure.

[0011] A sealing ring is arranged between the outer diameter of the annular sealing seat and the annular valve seat.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. When the utility model is working, the valve ball moves up and down in the guide seat while rotating. The valve ball rotates automatically to remove the debris on the sealing surface of the sealing seat, so that the sealing surface of the sealing seat is always kept clean, ensuring that the pump valve is completely closed and realizing the continuous delivery of the plugging liquid; and the upper part of the guide seat is evenly distributed with large notches, which is convenient for the debris in the plugging liquid to pass smoothly, ensuring that the plugging liquid delivery channel is unobstructed.

[0014] 2. The utility model connects the closed end of the suction pipeline with the plugging liquid tank through a reflux pipeline, and controls it through a reflux valve to effectively discharge the plugging liquid impurities precipitated and accumulated at the closed end of the suction pipeline, thereby ensuring the continuous operation of the plugging liquid delivery pump, reducing the maintenance frequency, reducing labor intensity, and improving the working efficiency of the plugging liquid delivery pump; and the plugging liquid refluxed to the plugging liquid tank can re-enter the plugging liquid delivery pump from the suction pipeline, reducing the waste of plugging liquid.

[0015] 3. The utility model provides a flushing valve at the closed end of the suction pipeline to facilitate the discharge of cleaning liquid in the reflux pipeline and the suction pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic cross-sectional view of the structure of the utility model;

[0017] Figure 2 It is a structural schematic diagram of an embodiment of the utility model;

[0018] Figure 3This is a schematic diagram of the structure of the liquid suction valve and the liquid discharge valve of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the annular sealing seat of the utility model;

[0020] Figure 5 yes Figure 4 A partial enlarged schematic diagram;

[0021] Figure 6 This is a schematic diagram of the structure of the annular guide seat of the utility model;

[0022] Figure 7 It is a schematic diagram of the existing mud pump structure. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-6 The utility model is described in detail with specific implementation modes.

[0024] A plugging liquid delivery pump hydraulic end structure, including a pump head 6, a suction pipeline 7 and a discharge pipeline 8, the pump head 6 includes a body 9, a suction valve 10, and a discharge valve 11, the suction valve 10 and the discharge valve 11 are respectively installed in the suction port and the discharge port in the body 9, the suction pipeline 7 is connected to the suction port, the discharge pipeline 8 is connected to the discharge port, the suction valve 10 and the discharge valve 11 both include an annular valve seat 1, an annular valve seat 12 and an annular valve seat 13 are coaxially arranged from bottom to top. A sealing seat 2 and an annular guide seat 3, wherein the lower end of the annular sealing seat 2 is embedded in the upper part of the annular valve seat 1, the upper end of the annular valve seat 1 is threadedly connected with the annular guide seat 3, and the upper end of the annular sealing seat 2 is embedded in the annular guide seat 3, and the annular sealing seat 2 is pressed onto the upper part of the annular valve seat 1 through the annular guide seat 3; a valve ball 4 which can move up and down and rotate freely is installed in the annular guide seat 3, and when the valve ball 4 falls and fits tightly against the upper end of the annular sealing seat 2, the pump valve is closed.

[0025] Furthermore, the closed end of the liquid suction pipeline 7 is connected to the leak-proof liquid tank through a reflux pipeline 12 , and a reflux valve 13 is provided on the reflux pipeline 12 .

[0026] Furthermore, a flushing valve 14 is provided at the closed end of the liquid suction pipeline 7 .

[0027] Furthermore, the upper end surface of the annular sealing seat 2 is a conical surface 2-2, which ensures smooth inflow and outflow of the plugging liquid; the bottom of the conical surface 2-2 protrudes inward to form a conical sealing surface 2-1; the conical angle α of the conical sealing surface is 64°-66°, and the height H is 2-3 mm; when the valve ball 4 falls and fits closely with the conical sealing surface 2-1, the pump valve is closed. By reducing the close contact area between the valve ball 4 and the upper end of the annular sealing seat 2 after the valve ball 4 falls, the sealing effect is improved, the processing accuracy is reduced, and the yield rate is improved.

[0028] In one embodiment (ref. Figure 4 ), the cone angle α is preferably 65°, and the H is preferably 2.5 mm.

[0029] Furthermore, the annular sealing seat 2 is a non-metallic structure, preferably made of polyurethane, to reduce wear of the valve ball 4 and ensure a sealing effect.

[0030] Furthermore, a sealing ring 5 is provided between the outer diameter of the annular sealing seat 2 and the annular valve seat 1 to ensure a sealing effect.

[0031] Furthermore, the annular guide seat 3 has evenly distributed notches 3-1 on the upper part, so that a plurality of symmetrically arranged guide columns 3-2 are formed on the upper part of the annular guide seat 3. The cross section of the guide column 3-2 is an isosceles triangle structure with the sharp corner facing inward, and the sharp corner is chamfered to form a vertical guide surface 3-3, and the vertical guide surface 3-3 protrudes from the inner diameter of the bottom of the annular guide seat 3. When the valve ball 4 moves up and down, it is guided by the vertical guide surface 3-3, which reduces the contact area between the annular guide seat 3 and the valve ball 4, reduces the friction force, and facilitates the up and down movement of the valve ball 4. The upper end of the annular sealing seat 2 is embedded in the inner diameter of the bottom of the annular guide seat 3, and the outer diameter of the annular sealing seat 2 has a shoulder 2-3, and the lower end of the annular guide seat 3 abuts against the shoulder 2-3.

[0032] In one embodiment (refer to Figure 3 ), the upper part of the valve seat 1 is provided with an annular recess 1-2 and a first internal thread 1-1, the lower part of the guide frame 3 is provided with an external thread 3-4, the first internal thread 1-1 is threadedly connected with the external thread 3-4; the lower end of the annular sealing seat 2 is embedded in the annular recess 1-2.

[0033] In order to facilitate the disassembly of the utility model, a second internal thread 1-3 is provided at the lower part of the inner cavity of the annular valve seat 1. The utility model can be disassembled from the pump head by threading a disassembly tool with the second internal thread 1-3.

[0034] During the working process of the utility model, when the suction valve 10 and the discharge valve 11 are opened and closed, since the plugging liquid contains various impurities, each point in the flow process contains different impurities, and the specific gravity and flow rate are also different. Therefore, the valve ball 4 will rotate under the action of the plugging liquid during the lifting and falling process. When the valve ball falls to the conical sealing surface 2-1, the impurities on the sealing surface are automatically cleaned (scraped) away by the self-rotation of the valve ball, so that the sealing surface of the sealing seat is always kept clean, ensuring that the pump valve is completely closed, and realizing continuous delivery of the plugging liquid.

[0035] In one embodiment (refer to Figure 2), three pump heads 6 are arranged side by side at the hydraulic end of the plugging liquid delivery pump, the suction pipeline 7 is respectively connected in parallel with the suction ports of the three pump heads 6, and the discharge pipeline 8 is respectively connected in parallel with the discharge ports of the three pump heads 6. When the plugging liquid delivery pump is working, the plugging liquid in the plugging liquid tank is sucked in through the suction pipeline 7 and the suction valve 10, and discharged from the discharge valve 11 and the discharge pipeline 8, completing the delivery of the plugging liquid. When the plugging pump vibrates and the pressure gauge swings too much, it means that there are too many plugging liquid impurities deposited and accumulated at the closed end of the suction pipeline 7, which affects or even blocks the suction port, and the plugging liquid cannot be sucked in smoothly. The reflux valve 13 is opened in time, and the plugging liquid enters the plugging liquid tank through the reflux pipeline 12. At the same time, the plugging liquid impurities deposited and accumulated at the closed end of the suction pipeline 7 are discharged with the plugging liquid. After the pressure of the pressure gauge is stable, the reflux valve 13 is closed, and the plugging liquid resumes being sucked from the suction valve 10, and is discharged from the discharge valve 11 and the discharge pipeline 8 to the plugging point. This reciprocating cycle continuously removes the plugging liquid impurities deposited at the closed end of the suction pipeline 7, ensuring the continuous normal operation of the plugging pump, reducing the maintenance frequency, reducing the labor intensity, and improving the working efficiency of the plugging pump. After the plugging liquid is transported, the plugging liquid delivery pump inhales the cleaning liquid to clean the pump and the pipeline. After the cleaning is completed, the waste cleaning liquid remaining in the reflux pipeline 12 and the suction pipeline 7 is discharged through the flushing valve 14.

[0036] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A plugging liquid delivery pump hydraulic end structure, comprising a pump head (6), a liquid suction pipeline (7) and a liquid discharge pipeline (8), wherein the pump head (6) comprises a body (9), a liquid suction valve (10) and a liquid discharge valve (11), wherein the liquid suction valve (10) and the liquid discharge valve (11) are respectively installed in a liquid suction port and a liquid discharge port in the body (9), wherein the liquid suction pipeline (7) is connected to the liquid suction port, and the liquid discharge pipeline (8) is connected to the liquid discharge port, wherein: The liquid suction valve (10) and the liquid discharge valve (11) both comprise an annular valve seat (1), an annular sealing seat (2), and an annular guide seat (3) which are coaxially arranged from bottom to top. The lower end of the annular sealing seat (2) is embedded in the upper part of the annular valve seat (1). The upper end of the annular valve seat (1) is threadedly connected with the annular guide seat (3), and the upper end of the annular sealing seat (2) is embedded in the annular guide seat (3). The annular sealing seat (2) is pressed onto the upper part of the annular valve seat (1) through the annular guide seat (3). A valve ball (4) which can move up and down and rotate freely is installed in the annular guide seat (3), and when the valve ball (4) falls and is in close contact with the upper end of the annular sealing seat (2), the pump valve is closed.

2. The hydraulic end structure of the plugging liquid delivery pump according to claim 1 is characterized in that: The closed end of the liquid suction pipeline (7) is connected to the leak-proof liquid tank via a return pipeline (12), and a return valve (13) is provided on the return pipeline (12).

3. The hydraulic end structure of the plugging liquid delivery pump according to claim 2 is characterized in that: The closed end of the liquid suction pipeline (7) is also provided with a flushing valve (14).

4. The hydraulic end structure of the plugging liquid delivery pump according to claim 1, 2 or 3, characterized in that: The upper end surface of the annular sealing seat (2) is a conical surface (2-2), and the bottom of the conical surface (2-2) protrudes inward to form a conical sealing surface (2-1); the conical angle α of the conical sealing surface is 64°-66°, and the height H is 2-3 mm; when the valve ball (4) falls and is in close contact with the conical sealing surface (2-1), the pump valve is closed.

5. The hydraulic end structure of the plugging liquid delivery pump according to claim 4 is characterized in that: The annular guide seat (3) has evenly distributed notches (3-1) on its upper portion, so that a plurality of symmetrically arranged guide columns (3-2) are formed on its upper portion, the cross section of the guide column (3-2) being an isosceles triangle structure with its sharp corner facing inward, and the sharp corner is chamfered to form a vertical guide surface (3-3), and the vertical guide surface (3-3) protrudes from the inner diameter of the bottom of the annular guide seat (3); the valve ball (4) is guided by the vertical guide surface (3-3) when it moves up and down.

6. The hydraulic end structure of the plugging liquid delivery pump according to claim 5 is characterized in that: The upper end of the annular sealing seat (2) is embedded in the inner diameter of the bottom of the annular guide seat (3), the outer diameter of the annular sealing seat (2) is provided with a shoulder (2-3), and the lower end of the annular guide seat (3) abuts against the shoulder (2-3).

7. The hydraulic end structure of the plugging liquid delivery pump according to claim 6 is characterized in that: The annular sealing seat (2) is a non-metallic structure.

8. The hydraulic end structure of the plugging liquid delivery pump according to claim 7 is characterized in that: A sealing ring (5) is provided between the outer diameter of the annular sealing seat (2) and the annular valve seat (1).

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