Downhole pump structure with multi-section limiters

Abstract

The present invention relates to a downhole pump structure with multiple stoppers, including a pump assembly, the pump assembly including a stator and a rotor, the pump structure also including multiple stoppers, each stopper is connected to each other, and a stopper located at the tail is also connected to the pump assembly; the stopper includes a shell assembly and an oil pumping assembly, a casing is also arranged between the outer side of part of the oil pumping assembly and the inner side of the shell assembly, a bearing assembly and a sealing assembly are respectively arranged on the outer side of the casing, an oil-through ring is also arranged on the outer side of the oil pumping assembly, an adjustment assembly is arranged on the side of the oil-through ring away from the casing, and an elastic member is also arranged on the outer side of the oil pumping assembly, one end of the elastic member abuts against part of the adjustment assembly. The present invention arranges an elastic member on the outer side of each sucker rod, which can decompose the weight of the sucker rod and the crude oil in the process of lifting crude oil, and avoids the sucker rod or the adjustment rod from being offset and contacting the oil pipe assembly due to gravity during the crude oil lifting process, thereby forming eccentric wear.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical equipment, and in particular to a downhole pump structure with a multi-section limiter. Background Art

[0002] The downhole screw pump is composed of a rotor and a stator, and is a positive displacement pump. The rotor is the only moving part of the pump, and the sucker rod can be used to lower it into the well, and the ground power is transmitted to the rotor through the sucker rod to make the rotor rotate. However, due to different downhole operation conditions, if the traditional structure of the downhole screw pump is still used for L-type horizontal wells, there will be the following problems:

[0003] (1) The sucker rod and the oil pipe are affected by the bending part of the L-shaped horizontal well and the increase of the weight of the liquid in the sucker rod and the oil pipe, which will cause eccentric wear. The occurrence of eccentric wear leads to an increase in torque, which further causes the sucker rod to break. If maintenance is required, the well needs to be lifted, which is very costly.

[0004] (II) The difficulty of assembling downhole screw pumps is a well-known problem in the industry. Simplifying the assembly difficulty and improving the assembly efficiency are one of the problems that need to be overcome in this field. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a downhole pump structure with a multi-section limiter to solve one or more problems in the prior art.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A downhole pump structure with multiple limiters includes a pump assembly, wherein the pump assembly includes a stator and a rotor rotatably arranged inside the stator, and the pump structure also includes multiple limiters, each of which is connected to each other, and a limiter located at the tail is also connected to the pump assembly; the limiter includes a shell assembly and an oil pumping assembly arranged inside the shell assembly, a casing is also arranged between the outer side of part of the oil pumping assembly and the inner side of the shell assembly, a bearing assembly and a sealing assembly are respectively arranged on the outer side of the casing, an oil passing ring is also arranged on the outer side of the oil pumping assembly, an adjusting assembly is arranged on the side of the oil passing ring away from the casing, and an elastic member is also arranged on the outer side of the oil pumping assembly, and one end of the elastic member abuts against part of the adjusting assembly.

[0008] Furthermore, the pumping assembly includes a plurality of pumping rods and a plurality of adjusting rods, and adjacent pumping rods and adjusting rods are connected via joints; a step is provided on each of the pumping rods, and the other end of the elastic member abuts against the step.

[0009] Furthermore, the adjustment assembly includes a first straightening joint and a first bearing ring abutting against the first straightening joint, and the first straightening joint and the first bearing ring are both arranged away from the pump assembly; the first straightening joint has a first mounting hole axially arranged, and the first bearing ring includes a first bearing ring body, and the first bearing ring body has a first through hole, and a first conical surface is formed from the opening of the first through hole to the edge of the first bearing ring body, and a plurality of first openings and a plurality of first oil grooves are also arranged on the first bearing ring body, and the groove width of each first opening increases gradually from the groove to the outer side of the first bearing ring body, so that the two sides of the first opening form a first angle γ, and the angle range of the first angle γ is 70°±5°.

[0010] Furthermore, the adjustment assembly includes a second straightening joint and a second bearing ring abutting the second straightening joint; the second straightening joint includes a first joint body, a second mounting hole is opened at the center of the first joint body, at least two first protrusions are arranged on the outer side of the first joint body, each of the first protrusions has a first arc edge on the outer side, a second angle θ is formed between the two adjacent sides of the first protrusion, and the angle range of the second angle θ is 60°±5°; the second bearing ring includes a second bearing ring body, the second bearing ring body has a second through hole, a second cone is formed from the orifice of the second through hole to the edge of the second bearing ring body, a plurality of second openings are opened along the hole wall of the second through hole, and a plurality of second oil grooves are also opened on the second bearing ring body, the groove width of each second opening increases from the groove to the outer side of the second bearing ring body, so that the two sides of the second opening form a third angle α, and the angle range of the third angle α is 50°±5°.

[0011] Furthermore, the adjustment assembly includes a third straightening joint and a third bearing ring abutting the third straightening joint; the third straightening joint includes a second joint body, a third mounting hole is opened at the center of the second joint body, at least two second protrusions are arranged on the outer side of the second joint body, each of the second protrusions has a second arc edge on the outer side, and a fourth angle β is formed between the two adjacent sides of the second protrusion, and the angle range of the fourth angle β is 40°±5°; the third bearing ring includes a third bearing ring body, the third bearing ring body has a third through hole, and a third conical surface is formed from the orifice of the third through hole to the edge of the third bearing ring body, and a plurality of third oil grooves are also opened on the third bearing ring body.

[0012] Furthermore, the bearing assembly includes a first bearing, a second bearing and a third bearing, and the sealing assembly includes a first sealing member and a second sealing member, wherein the first sealing member is disposed between the first bearing and the second bearing, and the second sealing member is close to the third bearing.

[0013] Furthermore, the housing assembly includes a first housing and a second housing connected to the first housing, and a portion of the second housing away from the first housing is connected to a third housing.

[0014] Furthermore, a blocking portion is formed on the inner side of the second shell along the circumferential direction.

[0015] Furthermore, the first straightening joint is cylindrical.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows

[0017] (I) The present invention provides an elastic member on the outside of each sucker rod, which can decompose the weight of the crude oil during the process of lifting the crude oil, thereby preventing the sucker rod or the regulating rod from being deviated and contacting the outer pipe assembly due to the influence of gravity during the crude oil lifting process, thereby preventing eccentric wear, further preventing the increase of torque, effectively ensuring the service life of the sucker rod, and avoiding the need to lift the well, thereby reducing maintenance costs.

[0018] (ii) Furthermore, the present invention can realize rapid assembly of the overall rod structure consisting of the sucker rod and the adjusting rod by arranging the first bearing ring, the first straightening joint, the second bearing ring, the second straightening joint, the third bearing ring and the third straightening joint, thereby effectively improving the assembly efficiency.

[0019] (III) Furthermore, a first conical surface is provided on the first bearing ring, a second conical surface is provided on the second bearing ring, and a third conical surface is provided on the third bearing ring, which can ensure that the first straightening joint, the second straightening joint, the third straightening joint and the corresponding bearing rings are quickly aligned, ensure that the first straightening joint is concentric with the first bearing ring, the second straightening joint is concentric with the second bearing ring, and the third straightening joint is concentric with the third bearing ring, thereby ensuring that the sucker rod body and the adjusting rod are always in the axial position. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a downhole pump structure with a multi-section limiter according to an embodiment of the present invention is shown.

[0021] Figure 2 A cross-sectional view of a downhole pump structure with a multi-section limiter according to an embodiment of the present invention is shown.

[0022] Figure 3 An enlarged schematic diagram of a downhole pump structure with a multi-section limiter at position A according to an embodiment of the present invention is shown.

[0023] Figure 4 An enlarged schematic diagram of a downhole pump structure with a multi-section limiter at position B according to an embodiment of the present invention is shown.

[0024] Figure 5An enlarged schematic diagram of a downhole pump structure with a multi-section limiter at position C according to an embodiment of the present invention is shown.

[0025] Figure 6 An enlarged schematic diagram of a downhole pump structure with a multi-section limiter at position D according to an embodiment of the present invention is shown.

[0026] Figure 7 A schematic diagram of the connection between the first straightening joint and the first bearing ring in a downhole pump structure with a multi-section limiter according to an embodiment of the present invention is shown.

[0027] Figure 8 A schematic diagram of the connection between the second straightening joint and the second bearing ring in a downhole pump structure with a multi-section stopper according to an embodiment of the present invention is shown.

[0028] Fig. 9 A schematic diagram of the connection between the third straightening joint and the third bearing ring in a downhole pump structure with a multi-section stopper according to an embodiment of the present invention is shown.

[0029] Fig.10 A schematic structural diagram of a second righting joint in a downhole pump structure with a multi-section stopper according to an embodiment of the present invention is shown.

[0030] Fig.11 A schematic structural diagram of a third righting joint in a downhole pump structure with a multi-section stopper according to an embodiment of the present invention is shown.

[0031] Fig.12 A schematic structural diagram of a first bearing ring in a downhole pump structure with a multi-section limiter according to an embodiment of the present invention is shown.

[0032] Fig.13 A schematic structural diagram of a second bearing ring in a downhole pump structure with a multi-section limiter according to an embodiment of the present invention is shown.

[0033] Fig.14 A schematic structural diagram of a third bearing ring in a downhole pump structure with a multi-section limiter according to an embodiment of the present invention is shown.

[0034] Markings in the accompanying drawings: 1, limiter; 100, first shell; 101, second shell; 1010, baffle; 102, third shell; 103, sucker rod; 1030, step; 104, spring; 105, first straightening joint; 1050, first mounting hole; 106, first bearing ring; 1060, first bearing ring body; 1061, first cone; 1062, first opening; 1063, first through hole; 1064, first oil groove; 107, oil ring; 1070, oil hole; 108, sealing body; 109, spacer; 110, first bearing; 111, first sealing member; 112, second bearing; 113, third bearing; 114, second sealing member; 115, adjusting rod; 116, first cover ;117, joint;118, second bearing ring;1180, second bearing ring body;1181, second conical surface;1182, second opening;1183, second through hole;1184, second oil groove;119, sleeve;120, second straightening joint;1200, first joint body;1201, first protrusion;1202, second mounting hole;1203, first arc edge;121, third bearing ring;1210, third bearing ring body;1211, third conical surface;1212, third oil groove;1213, third through hole;122, third straightening joint;1220, second joint body;1221, second protrusion;1222, third mounting hole;1223, second arc edge;2, stator;3, rotor. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention clearer, the downhole pump structure with multi-section limiter proposed by the present invention is further described in detail below in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiment of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0036] Please refer to Figure 1The downhole pump structure with multi-section stoppers of the present invention includes a pump assembly, and the pump assembly includes a stator 2 and a rotor 3 rotatably arranged inside the stator 2. The pump structure also includes a multi-section stopper 1, each section of the stopper 1 is connected to form a whole and connected to one end of the stator. Specifically, in the downhole pump structure with multi-section stoppers of the first embodiment, the stopper 1 is three-section, and each section of the stopper 1 is connected to each other, and one of the sections of the stopper 1 located at the tail is connected to the stator 2 in the pump assembly.

[0037] Please refer to Figure 2 and Figure 3 The limiter 1 includes a housing component and an oil pumping component disposed inside the housing component. A sleeve 119 is disposed between the outer side of a part of the oil pumping component and the inner side of the housing component. A bearing component and a sealing component are disposed on the outer side of the sleeve 119. An oil-through ring 107 is disposed on the outer side of the oil pumping component. The oil-through ring 107 has an oil-through hole 1070. An adjustment component is disposed on the side of the oil-through ring 107 away from the sleeve 119. An elastic member is disposed on the outer side of the oil pumping component. One end of the elastic member abuts against a part of the adjustment component. For details, please continue to refer to Figure 2 and Figure 3 , the elastic member is preferably a spring 104.

[0038] For further information, please continue to refer to Figure 1 , Figure 2 and Figure 3 The pumping assembly includes a plurality of pumping rods 103 and a plurality of adjusting rods 115, and adjacent pumping rods 103 and adjusting rods 115 are connected by joints 117. A step 1030 is provided on each pumping rod 103, and the spring 104 is sleeved on the outer side of the pumping rod 103, and the other end of the spring 104 abuts against the step 1030.

[0039] Please refer to Figure 6 The specific structure of the adjusting assembly is further described below. The adjusting assembly facilitates the assembly of the sucker rod 103 and the adjusting rod 115 on the one hand, and is used to support one end of the spring 104 on the other hand.

[0040] For further information, please refer to Figure 7 and Fig.12 The adjustment assembly includes a first stabilizing joint 105 and a first bearing ring 106 abutting against the first stabilizing joint 105. The first stabilizing joint 105 and the first bearing ring 106 are both arranged away from the pump assembly (at Figure 3 The first centralizing joint 105 and the first bearing ring 106 are both located at the left end of the downhole pump structure, and the first centralizing joint 105 has a first mounting hole 1050 axially defined therein. Preferably, in this embodiment, the first centralizing joint 105 is cylindrical.

[0041] For further information, please continue to refer to Figure 7 and Fig.12 The first bearing ring 106 includes a first bearing ring body 1060, and the first bearing ring body 1060 has a first through hole 1063. A first conical surface 1061 is formed from the opening of the first through hole 1063 to the edge of the first bearing ring body 1060. A plurality of first openings 1062 and a plurality of first oil grooves 1064 are also provided on the first bearing ring body 1060. The groove width of each first opening 1062 increases from the groove to the outer side of the first bearing ring body 1060, so that a first angle γ is formed on both sides of the first opening 1062. The angle range of the first angle γ is 70°±5°. In the present embodiment, the first angle γ is preferably 75°.

[0042] Please refer to Figure 8 , Fig.10 and Fig.13 , the adjustment assembly also includes a second straightening joint 120 and a second bearing ring 118 abutting against the second straightening joint 120. The second straightening joint 120 and the second bearing ring 118 are arranged inside another section of the limiter 1, wherein the second straightening joint 120 includes a first joint body 1200, a second mounting hole 1202 is provided at the center of the first joint body 1200, at least two first protrusions 1201 are provided on the outside of the first joint body 1200, each first protrusion 1201 has a first arc edge 1203 on the outside, and a second angle θ is formed between the adjacent two sides of the first protrusion 1201, the angle range of the second angle θ is 60°±5°, and the second angle θ is preferably 65°.

[0043] For further information, please continue to refer to Figure 8 , Fig.10 and Fig.13 The second bearing ring 118 includes a second bearing ring body 1180, which has a second through hole 1183. A second conical surface 1181 is formed from the opening of the second through hole 1183 to the edge of the second bearing ring body 1180. A plurality of second openings 1182 are provided along the hole wall of the second through hole 1183. A plurality of second oil grooves 1184 are also provided on the second bearing ring body 1180. The groove width of each second opening 1182 increases from the groove to the outer side of the second bearing ring body 1180, so that a third angle α is formed on both sides of the second opening 1182. The angle range of the third angle α is 50°±5°, and the third angle α is preferably 55°.

[0044] For further information, please refer to Figure 6 , Fig. 9 , Fig.11 and Fig.14The above-mentioned adjustment component also includes a third straightening joint 122 and a third bearing ring 121 abutting against the third straightening joint 122; the third straightening joint 122 includes a second joint body 1220, a third mounting hole 1222 is provided at the center of the second joint body 1220, at least two second protrusions 1221 are arranged on the outer side of the second joint body 1220, each second protrusion 1221 has a second arc edge 1223 on the outer side, and a fourth angle β is formed between the two adjacent sides of the second protrusion 1221, the angle range of the fourth angle β is 40°±5°, and the fourth angle β is preferably 45°; the third bearing ring 121 includes a third bearing ring body 1210, the third bearing ring body 1210 has a third through hole 1213, a third conical surface 1211 is formed from the orifice of the third through hole 1213 to the edge of the third bearing ring body 1210, and a plurality of third oil grooves 1212 are also provided on the third bearing ring body 1210.

[0045] Please refer to Figure 3 The bearing assembly disposed outside the casing 119 includes a first bearing 110, a second bearing 112 and a third bearing 113, and the sealing assembly includes a first seal 111 and a second seal 114, a sealing body 108 and a spacer 109. The first seal 111 is disposed between the first bearing 110 and the second bearing 112, and the second seal 114 is close to the third bearing 113, wherein the first bearing 110 and the third bearing 113 are both load-bearing bearings, and the second bearing 112 is a straightening bearing. The first seal 111 and the second seal 114 are preferably packing seals. The first bearing 110, the second bearing 112 and the third bearing 113 can support the rotation of the casing 119 and the joint 117, the sucker rod 103 and the adjusting rod 115 inside the casing 119, and are closed by the first cover 116 at the outermost second seal 114.

[0046] For further information, please continue to refer to Figures 1 to 5 The housing assembly includes a first housing 100 and a second housing 101 connected to the first housing 100, and a portion of the second housing 101 away from the first housing 100 is connected to a third housing 102. For further information, please refer to Figure 5 A barrier portion 1010 is formed along the circumferential direction on the inner side of the second housing 101 , and the barrier portion 1010 enables the second bearing 112 and the third bearing 113 to be located at two sides of the barrier portion 1010 , respectively.

[0047] Please refer to Figures 1 to 3, since the sucker rod 103 and the adjusting rod 115 are connected by the joint 117, in order to facilitate the installation of the sucker rod 103 and the adjusting rod 115, after the casing 119, the bearing assembly, the sealing assembly, the oil ring 107 and the first bearing ring 106, the second bearing ring 118 and the third bearing ring 121 are all installed inside the shell assembly, the entire rod body consisting of the connected sucker rod 103 and the adjusting rod 115 is assembled into the shell assembly. Specifically, the first straightening joint 105, the second straightening joint 120 and the third straightening joint 122 are connected to the outside of each sucker rod 103. At this time, the whole composed of the sucker rod 103 and the adjusting rod 115 will first pass through the first bearing ring 106, and the third straightening joint 122 in the entire rod body will first pass through the first The supporting ring 106, since the fourth angle formed by the second protrusion 1221 in the third straightening joint 122 is smaller than the first angle γ formed on both sides of the first opening 1062 in the first supporting ring 106, and the second angle θ formed by the first protrusion 1201 in the second straightening joint 120 is also smaller than the first angle γ formed on both sides of the first opening 1062, the second straightening joint 120 and the third straightening joint 122 can both pass through the first through hole 1063 and the first opening 1062 of the first supporting ring 106. Since the third supporting ring 121 is not grooved, the second protrusion 1221 of the third straightening joint 122 contacts the third conical surface 1211 of the third supporting ring 121, thereby achieving the abutment between the third straightening joint 122 and the third supporting ring 121. At the same time, the second angle θ formed by the two sides of each first protrusion 1201 in the second centering joint 120 is preferably 65°, and the third angle α formed by the two sides of the second opening 1182 in the second bearing ring 118 is 55°, so the first protrusion 1201 in the second centering joint 120 cannot pass through the second opening 1182 of the second bearing ring 118, and its first protrusion 1201 abuts against the second conical surface 1181 of the second bearing ring 118. Similarly, since the outer diameter of the first centering joint 105 is larger than the aperture of the first through hole 1063 in the first bearing ring 106, the first centering joint 105 cannot pass through the first bearing ring 106, and it abuts against the first conical surface 1061 of the first bearing ring 106.

[0048] The specific working process of the present invention is as follows:

[0049] The well drive device is used to start and drive the sucker rod 103 and the adjusting rod 115 to rotate, and the power is transmitted to the rotor 3 in the pump assembly at the tail end. The rotor 3 rotates to lift the oil in the deep well. The crude oil passes through the oil holes 1070 in each oil ring 107 during the collection process. In addition, since the third oil groove 1212 is provided on the third bearing ring 121, the second oil groove 1184 is provided on the second bearing ring 118, and the first oil groove 1064 is provided on the first bearing ring 106, the crude oil can flow from one section of the stopper 1 to another section of the stopper 1. During the crude oil pumping process, the gravity of the crude oil and the gravity of the adjusting rod 115 and the sucker rod 103 will be applied to the spring 104, and the elastic deformation of the spring 104 is used to decompose the applied gravity, so that this part of the gravity is decomposed. The crude oil is lifted by one stopper 1 to a certain distance and then enters another stopper 1, and the cycle continues until it is lifted to the wellhead, thereby maintaining deep well mining with high pump efficiency. Each stopper can decompose the weight of the crude oil, reduce the weight, and avoid eccentric wear.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A downhole pump structure with a multi-section stopper, comprising a pump assembly, wherein the pump assembly comprises a stator and a rotor rotatably disposed inside the stator, characterized in that: The pump structure also includes a plurality of stoppers, each of which is connected to each other, and a stopper located at the tail is also connected to the pump assembly; the stopper includes a housing assembly and an oil pumping assembly arranged inside the housing assembly, a sleeve is also arranged between the outer side of part of the oil pumping assembly and the inner side of the housing assembly, a bearing assembly and a sealing assembly are respectively arranged on the outer side of the sleeve, an oil-passing ring is also arranged on the outer side of the oil pumping assembly, an adjustment assembly is arranged on the side of the oil-passing ring away from the sleeve, and an elastic member is also arranged on the outer side of the oil pumping assembly, and one end of the elastic member abuts against part of the adjustment assembly; The pumping assembly comprises a plurality of pumping rods and a plurality of adjusting rods, and adjacent pumping rods and adjusting rods are connected via joints; The adjustment assembly includes a first centering joint and a first bearing ring abutting against the first centering joint, and the first centering joint and the first bearing ring are both arranged far away from the pump assembly.

2. The downhole pump structure with a multi-section stopper according to claim 1, characterized in that: A step is arranged on each of the sucker rods, and the other end of the elastic member abuts against the step.

3. The downhole pump structure with a multi-section stopper according to claim 1, characterized in that: The first straightening joint has a first mounting hole axially arranged therein, the first bearing ring comprises a first bearing ring body, the first bearing ring body has a first through hole, a first conical surface is formed from the opening of the first through hole to the edge of the first bearing ring body, a plurality of first openings and a plurality of first oil grooves are also arranged on the first bearing ring body, the groove width of each of the first openings increases gradually from the groove to the outer side of the first bearing ring body, so that a first angle γ is formed on both sides of the first opening, and the angle range of the first angle γ is 70°±5°.

4. The downhole pump structure with a multi-section stopper according to claim 1, characterized in that: The adjustment assembly includes a second straightening joint and a second bearing ring abutting against the second straightening joint; the second straightening joint includes a first joint body, a second mounting hole is provided at the center of the first joint body, at least two first protrusions are provided on the outer side of the first joint body, each of the first protrusions has a first arc edge on the outer side, a second angle θ is formed between two adjacent sides of the first protrusion, and the angle range of the second angle θ is 60°±5°; the second bearing ring includes a second bearing ring body, the second bearing ring body has a second through hole, a second cone is formed from the orifice of the second through hole to the edge of the second bearing ring body, a plurality of second openings are provided along the hole wall of the second through hole, and a plurality of second oil grooves are also provided on the second bearing ring body, the groove width of each second opening increases from the groove to the outer side of the second bearing ring body, so that the two sides of the second opening form a third angle α, and the angle range of the third angle α is 50°±5°.

5. The downhole pump structure with multi-section limiters according to claim 1, characterized in that: The adjustment assembly includes a third straightening joint and a third bearing ring abutting the third straightening joint; the third straightening joint includes a second joint body, a third mounting hole is provided at the center of the second joint body, at least two second protrusions are provided on the outer side of the second joint body, each of the second protrusions has a second arc edge on the outer side, a fourth angle β is formed between two adjacent sides of the second protrusion, and the angle range of the fourth angle β is 40°±5°; the third bearing ring includes a third bearing ring body, the third bearing ring body has a third through hole, a third conical surface is formed from the orifice of the third through hole to the edge of the third bearing ring body, and a plurality of third oil grooves are also provided on the third bearing ring body.

6. The downhole pump structure with multi-section limiters according to claim 1, characterized in that: The bearing assembly includes a first bearing, a second bearing and a third bearing. The sealing assembly includes a first sealing member and a second sealing member. The first sealing member is disposed between the first bearing and the second bearing, and the second sealing member is close to the third bearing.

7. The downhole pump structure with a multi-section stopper according to claim 1, characterized in that: The housing assembly includes a first housing and a second housing connected to the first housing, wherein a portion of the second housing away from the first housing is connected to a third housing.

8. The downhole pump structure with a multi-section stopper according to claim 7, characterized in that: A barrier portion is formed on the inner side of the second housing along a circumferential direction.

9. The downhole pump structure with a multi-section stopper according to claim 3, characterized in that: The first righting joint is cylindrical.

Images