High-efficiency multistage nonmetallic seal oil extraction pump

Abstract

The utility model provides a high -efficient multistage nonmetallic sealing oil pumping pump, including pump cylinder assembly and plunger assembly, is uniformly arranged with a plurality of groups annular grooves along its axial direction on the outer edge of plunger body of plunger assembly, and each group annular groove is multiple and is equipped with nonmetallic sealing ring respectively in each annular groove, and the outer edge of nonmetallic sealing ring is extruded contact with the inner wall of pump cylinder assembly, the width of each annular groove is 2 3 times of the diameter of nonmetallic sealing ring, and the groove bottom of each annular groove is formed by straight section and inclined plane located at both ends, plunger assembly is made the nonmetallic sealing ring slide from the lower end to the upper end and the deformation reduce under the friction of the inner wall of pump cylinder assembly when plunger assembly is down in pump cylinder assembly, and plunger assembly is made the nonmetallic sealing ring slide from the upper end to the lower end and the deformation increase under the friction of the inner wall of pump cylinder assembly when plunger assembly is up in pump cylinder assembly. Advantages are: improve the pump efficiency, prolong the service life of oil pumping pump, maintenance is convenient, saves the time, and maintenance cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of oil exploitation, especially relates to a high -efficient multistage nonmetallic sealing oil pumping pump. BACKGROUND

[0002] In the oil exploitation process, the oil pumping pump cylinder in the oil pumping pump is pulled up and down by the oil pumping unit, the oil under the ground is lifted to the ground, the oil conveying pipeline system on the ground is completed, and the oil collection work is completed. The oil under the ground is lifted to the ground, and the upward pulling force provided by the oil pumping unit is relied on, and the sealing grade of the oil pumping pump is relied on. The sealing grade of the oil pumping pump is high, the gap between the plunger in the oil pumping pump cylinder and the pump cylinder is small, and the pump efficiency is high. The sealing grade of the oil pumping pump is low, the gap between the plunger in the oil pumping pump cylinder and the pump cylinder is large, and the pump efficiency is low.

[0003] At present, the pump efficiency of the standard oil pumping pump is determined by the cooperation gap between the plunger and the pump cylinder, and the machining standard of the standard oil pumping pump specifies five gap grades. Because the liquid lifted from the ground contains not only oil but also water and many solid particles, the sand in the solid particles causes great damage to the inner surface of the pump cylinder and the outer surface of the plunger, so the pump efficiency of the standard oil pumping pump will decrease rapidly due to wear, which affects the service life. When the sand content in the liquid is large, the oil pumping pump will also have sand sticking accidents.

[0004] When the pump efficiency decreases to a certain value, it is necessary to stop pumping and stop production for operation. The operation is to take out the standard oil pumping pump from the underground for replacement, the sucker rod and the oil pipe are taken out from the underground in sequence, and finally the standard oil pumping pump is taken out. After the inspection of the standard oil pumping pump, the plunger or the pump cylinder is replaced or a new pump is replaced. Then the newly repaired or replaced pump is lowered to the underground, and finally the sucker rod and the oil pipe are lowered to the underground from the ground in sequence. The whole process is time-consuming and laborious, and the maintenance cost is high. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem to provide a high -efficient multistage nonmetallic sealing oil pumping pump with high pump efficiency and low maintenance cost.

[0006] In order to realize the above purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a high -efficient multistage nonmetallic sealing oil pumping pump, including pump cylinder assembly and the plunger assembly of inserting into pump cylinder assembly, its special aspect is: the outer edge of plunger body of plunger assembly is evenly arranged with multiple sets of annular grooves along its axial direction, each set of annular grooves is continuously equidistantly arranged multiple and is tightly sleeved with nonmetallic sealing ring respectively in each annular groove, and the outer edge of nonmetallic sealing ring is in extrusion contact with the inner wall of pump cylinder assembly, is used for sealing the working gap between plunger assembly and pump cylinder assembly, the width of each annular groove is 2-3 times of the diameter of the nonmetallic sealing ring, and the groove bottom of each annular groove is formed by the straight section at both ends and the inclined surface connecting two straight sections, and the outer diameter of the lower end of each annular groove is greater than the outer diameter of the upper end,

[0008] when the plunger assembly is descending in the pump cylinder assembly, the nonmetallic sealing ring slides from the lower end to the upper end of the annular groove under the friction of the inner wall of the pump cylinder assembly and the deformation decreases, and when the plunger assembly is ascending in the pump cylinder assembly, the nonmetallic sealing ring slides from the upper end to the lower end of the annular groove under the friction of the inner wall of the pump cylinder assembly and the deformation increases.

[0009] As a further preferred, the plunger assembly is connected with an upper valve through a joint at the upper end of the plunger body, and is connected with a lower valve through a thread at the lower end of the plunger body, and a guide sleeve is connected to the lower end of the valve cover of the lower valve.

[0010] As a further preferred, the pump cylinder assembly comprises an outer cylinder and an inner cylinder nested with each other, an annular gap is arranged between the outer cylinder and the inner cylinder, an oil pipe coupling is connected to the upper end of the outer cylinder for connecting an oil pipe, a guide ring is connected to the upper end of the inner cylinder in the outer cylinder, a blocking coupling is connected to the lower end of the outer cylinder through the oil pipe coupling, and the lower end of the inner cylinder is tightly connected with the blocking coupling through a thread.

[0011] As a further preferred, a plurality of centralizing rings are fixed to the outer wall of the inner cylinder in the annular gap, the centralizing rings are petal-shaped and are uniformly provided with a plurality of arc grooves at the outer edges thereof, so that oil is introduced to transmit pressure and avoid expansion and deformation of the inner cylinder.

[0012] As a further preferred, the working gap is 1-2 mm.

[0013] As a further preferred, the annular grooves are five sets and each set is three.

[0014] The utility model discloses a high -efficient multistage nonmetallic sealing oil pumping pump, including pump cylinder assembly and the plunger assembly of inserting into pump cylinder assembly, its special aspect is: the outer edge of plunger body of plunger assembly is evenly arranged with multiple sets of annular grooves along its axial direction, each set of annular grooves is continuously equidistantly arranged multiple and is tightly sleeved with nonmetallic sealing ring respectively in each annular groove, and the outer edge of nonmetallic sealing ring is in extrusion contact with the inner wall of pump cylinder assembly, is used for sealing the working gap between plunger assembly and pump cylinder assembly, the width of each annular groove is 2-3 times of the diameter of the nonmetallic sealing ring, and the groove bottom of each annular groove is formed by the straight section at both ends and the inclined surface connecting two straight sections, and the outer diameter of the lower end of each annular groove is greater than the outer diameter of the upper end,

[0015] 1. The non-metallic sealing ring is in extrusion contact with the inner wall of the pump cylinder assembly by being sleeved in the annular grooves on the outer edge of the plunger body, which not only directly eliminates the gap between the outer diameter of the plunger and the inner diameter of the pump cylinder assembly, changes the gap oil film sealing between the inner diameter of the pump cylinder and the outer diameter of the plunger into the contact sealing between the non-metallic sealing ring and the inner wall of the pump cylinder, improves the pump efficiency, but also reduces the outer diameter of the plunger body, prolongs the service life of the oil pump and prevents sand sticking accidents.

[0016] 2. When the pump efficiency decreases to a certain value, the oil pump repair is completed by sequentially taking out the sucker rod and the plunger and replacing the worn non-metallic sealing ring, which is convenient for maintenance, saves labor and time, the plunger can be repeatedly used, and the maintenance cost is low.

[0017] 3. Since the width of each annular groove is 2-3 times the diameter of the non-metallic sealing ring, the groove bottom of each annular groove is composed of a straight section at both ends and a slope connecting the two straight sections, and the outer diameter of the lower end of the groove bottom is greater than that of the upper end; therefore, the non-metallic sealing ring can slide back and forth between the two ends of the annular groove and change in deformation under the friction of the inner wall of the pump cylinder assembly when the plunger assembly moves up and down in the pump cylinder assembly; the plunger assembly can be in closer and closer contact with the inner wall of the pump cylinder assembly when moving up, thereby increasing the sealing strength of the pump cylinder assembly and the plunger assembly, improving the pump efficiency and achieving the goal of efficient oil production; at the same time, the plunger assembly can gradually relax the contact with the inner wall of the pump cylinder assembly when moving down, thereby reducing the downward resistance of the plunger assembly under the condition of ensuring sealing, and the plunger assembly can smoothly reach the downstroke position. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structure schematic view of the utility model when moving up;

[0019] Figure 2 is a structure schematic view of the utility model when moving down.

[0020] Figure 3 is a structure schematic view of the pump cylinder assembly.

[0021] Figure 4 is a structure schematic view of the plunger assembly.

[0022] Figure 5 is a partial enlarged view of Figure 1

[0023] Figure 6 is a partial enlarged view of Figure 2

[0024] Figure 7 is a structure schematic view of the centralizing ring.

[0025] ​​In the diagram: sucker rod 100, plunger assembly 200, plunger body 201, upper valve 202, connector 203, guide sleeve 204, non-metallic sealing ring 205, annular groove 206, lower valve 207, pump barrel assembly 300, tubing coupling 301, guide ring 302, outer cylinder 303, inner cylinder 304, centralizing ring 305, tubing coupling 306, sealing coupling 307. Detailed Implementation

[0026] like Figures 1-7 As shown, this utility model relates to a high-efficiency multi-stage non-metallic sealed oil pump, including a pump barrel assembly 300 and a plunger assembly 200 inserted into the pump barrel assembly. The pump barrel assembly 300 includes an outer cylinder 303 and an inner cylinder 304 nested together, with an annular gap between the outer cylinder 303 and the inner cylinder 304. An oil pipe coupling 301 is threadedly connected to the upper end of the outer cylinder 303 for connecting the upper oil pipe. A guide ring 302 is threadedly connected to the upper end of the inner cylinder 304 inside the outer cylinder 303, with an annular gap also left between the outer edge of the guide ring 302 and the outer cylinder 303. The inner hole of the guide ring 302 is chamfered to facilitate the insertion of the plunger assembly 200. A sealing coupling 307 is connected to the lower end of the outer cylinder 303 through an oil pipe coupling 306, and the lower end of the inner cylinder 304 is tightly connected to the inner hole of the sealing coupling 307 by threads. The lower outer edge of the sealing coupling 307 is provided with an external thread to connect to the oil pipe below.

[0027] Multiple straightening rings 305 are fixedly welded to the outer wall of the inner cylinder 304 within the annular gap. The straightening rings 305 are petal-shaped and have multiple arc-shaped grooves evenly distributed on their outer edges so that oil can be introduced to create the same pressure in the annular gap between the inner and outer cylinders as inside the inner cylinder 304, thereby preventing the inner cylinder 304 from expanding and deforming.

[0028] like Figure 4 As shown, the plunger assembly 200 includes a plunger body 201. An upper valve 202 is connected to the upper end of the plunger body 201 via a connector 203. The two ends of the connector 203 are threadedly connected to the valve covers of the plunger body 201 and the upper valve 202, respectively. A lower valve 207 is threadedly connected to the lower end of the plunger body 201. A guide sleeve 204 is threadedly connected to the lower end of the valve cover of the lower valve 207. The lower end of the guide sleeve 204 is tapered so as to be inserted into the pump assembly 300.

[0029] A plurality of annular grooves 206 are evenly distributed on the outer edge of the plunger body 201 along the axial direction, each annular groove 206 is a plurality of continuous equidistantly arranged grooves, and a non-metallic sealing ring 205 is tightly sleeved in each annular groove 206, respectively. The outer edge of the non-metallic sealing ring 205 is in extrusion contact with the inner wall of the inner cylinder 304 of the pump cylinder assembly 300, and is used for sealing the working gap between the plunger assembly 200 and the pump cylinder assembly 300. The width of each annular groove 206 is 2-3 times the diameter of the non-metallic sealing ring 205, and the groove bottom of each annular groove 206 is composed of two straight sections at both ends and a slope connecting the two straight sections, wherein the length of the two straight sections is less than the diameter of the non-metallic sealing ring 205, and the outer diameter of the lower end of the groove bottom of each annular groove 206 is greater than that of the upper end.

[0030] When the plunger assembly 200 descends in the pump cylinder assembly 300, the non-metallic sealing ring 205 slides from the lower end to the upper end of the annular groove 206 under the friction of the inner wall of the pump cylinder assembly 300 and the deformation decreases, thereby reducing the descending resistance of the plunger assembly under the condition of ensuring sealing. When the plunger assembly 200 ascends in the pump cylinder assembly 300, the non-metallic sealing ring 205 slides from the upper end to the lower end of the annular groove 206 under the friction of the inner wall of the pump cylinder assembly 300 and the deformation increases, thereby increasing the sealing strength of the pump cylinder assembly and the plunger assembly and improving the pump efficiency.

[0031] The working gap between the plunger assembly 200 and the pump cylinder assembly 300 is 1-2 mm. In the embodiment, the annular grooves 206 are five groups and each group has three annular grooves.

[0032] During operation, the upper end of the plunger assembly 200 is connected with the sucker rod 100 through threads, and is connected with the pumping unit on the ground through a plurality of sucker rods, for transmitting power and pulling the plunger assembly 200 to reciprocate in the pump cylinder assembly 300, thereby completing the oil production work.

[0033] When the plunger body 201 moves upward in the pump cylinder assembly 300, the upper valve 202 and the lower valve 207 are in a closed state, and the crude oil in the entire oil pipe string moves upward as a whole, thereby completing the oil output work. At the same time, due to the frictional resistance between the non-metallic sealing ring 205 and the inner wall of the inner cylinder 304, the non-metallic sealing ring 205 moves downward relative to the plunger. Since the bottom of the annular groove 206 is composed of two straight sections at both ends and a slope connecting the two straight sections, the deformation of the non-metallic sealing ring 205 increases and the contact between the non-metallic sealing ring 205 and the inner wall of the inner cylinder 304 becomes more and more close when the non-metallic sealing ring 205 moves downward, thereby achieving the pressure bearing capacity of lifting the original liquid and realizing the goal of efficient oil production.

[0034] When the plunger body 201 moves downward in the pump cylinder assembly 300, the upper valve 202 and the lower valve 207 are in the open state, and the crude oil in the oil layer flows along the oil pipe, enters the inner hole of the plunger assembly 200, and completes the oil pumping work through the oil pipe above the plunger assembly. At the same time, due to the frictional resistance between the non-metallic sealing ring 205 and the inner wall of the inner cylinder 304, the non-metallic sealing ring 205 moves upward relative to the plunger, and the deformation amount of the non-metallic sealing ring 205 becomes smaller and smaller when moving upward, thereby reducing the contact pressure between the non-metallic sealing ring 205 and the inner wall of the inner cylinder, so that the plunger assembly smoothly reaches the lower stroke position.

[0035] The above merely describes a preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art, according to the technical scheme and the inventive concept of the present application, can make equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A high-efficiency multi-stage non-metallic sealed oil pump, comprising a pump barrel assembly and a plunger assembly inserted into the pump barrel assembly, characterized in that: A plurality of annular grooves are evenly distributed on the outer edge of the plunger body of the plunger assembly along its axial direction, each annular groove is tightly sleeved with a non-metallic sealing ring, the outer edge of the non-metallic sealing ring is in extrusion contact with the inner wall of the pump barrel assembly, and the working gap between the plunger assembly and the pump barrel assembly is sealed; the width of each annular groove is 2-3 times the diameter of the non-metallic sealing ring, the groove bottom of each annular groove is composed of a straight section at both ends and a slope connecting the two straight sections, and the outer diameter of the lower end of the groove bottom of each annular groove is greater than that of the upper end. When the plunger assembly moves downward in the pump barrel assembly, the non-metallic sealing ring slides from the lower end to the upper end of the annular groove under the friction of the inner wall of the pump barrel assembly and the deformation decreases; when the plunger assembly moves upward in the pump barrel assembly, the non-metallic sealing ring slides from the upper end to the lower end of the annular groove under the friction of the inner wall of the pump barrel assembly and the deformation increases.

2. The high efficiency multi-stage non-metallic sealed oil extraction pump according to claim 1, characterized in that: The upper valve is connected to the upper end of the plunger body through a joint in the plunger assembly, the lower valve is connected to the lower end of the plunger body through a thread, and the guide sleeve is connected to the lower end of the valve cover of the lower valve.

3. The high-efficiency multi-stage non-metallic sealed oil extraction pump according to claim 1 or 2, characterized in that: The pump barrel assembly includes an outer barrel and an inner barrel nested with each other, an annular gap is arranged between the outer barrel and the inner barrel, an oil pipe coupling is connected to the upper end of the outer barrel for connecting an oil pipe, a guide ring is connected to the upper end of the inner barrel located in the outer barrel, a blocking coupling is connected to the lower end of the outer barrel through the oil pipe coupling, and the lower end of the inner barrel is tightly connected with the blocking coupling through a thread.

4. The high efficiency multi-stage non-metallic sealed oil extraction pump according to claim 3, characterized in that: A plurality of centralizing rings are fixed on the outer wall of the inner barrel located in the annular gap, the centralizing rings are petal-shaped and evenly distributed with a plurality of arc grooves on their outer edges to pass in oil to transfer pressure and avoid expansion and deformation of the inner barrel.

5. The high-efficiency multi-stage non-metallic sealed oil extraction pump according to claim 1 or 4, characterized in that: The working gap is 1-2 mm.

6. A high efficiency multi-stage non-metallic sealed oil pump as claimed in claim 5, wherein: The annular grooves are five groups and each group has three.

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