Submersible electric pump oil injection nozzle

Abstract

The utility model belongs to the technical field of submersible electric pump grease filling, especially relates to a submersible electric pump oil nozzle. In order to solve the technical problem that the existing oil nozzle cannot quickly switch the type of oil outlet joint to match the oil inlet of different types of submersible electric pump units, the utility model discloses a submersible electric pump oil nozzle, which comprises an oil inlet pipe joint, a connecting short section, a metric oil outlet joint and a British oil outlet joint. The utility model is provided with a spare oil outlet joint of another type on the oil nozzle, which can be directly sleeved on the original oil outlet joint to change the external output type of the oil outlet pipe joint, so that the type of the external output joint of the oil nozzle of the utility model can be quickly switched, the connection requirement of the oil inlet of different types of submersible electric pump units is met, the adaptability of the oil nozzle is improved, and the construction efficiency is ensured.

Description

Technical Field

[0001] This utility model relates to an oil injector for a submersible electric pump, belonging to the field of grease filling technology for submersible electric pumps. Background Technology

[0002] Submersible electric pump units (SAPs) are high-head, large-displacement, and highly efficient, enabling rapid production ramp-up and serving as crucial tools for increasing oilfield production in the later stages of development. A SSP consists of a centrifugal pump, separator, protector, and submersible motor. The motor and protector cavities must be filled with motor oil to ensure proper cooling and lubrication. During operation, the oil injection system adds motor oil to the motor and protector stage by stage via injection nozzles. Currently, the oil injection port models for these units are not standardized, with both imperial and metric sizes available. Mismatched threads frequently occur during on-site installation, and forced installation can easily damage the threads, leading to leaks at the connection between the injection nozzle and the unit's oil injection port. This affects construction quality and necessitates repair of both the unit's oil injection port and the injection nozzle, impacting efficiency. Furthermore, the commonly used straight-through injection nozzles cause oil backflow in the injection system pipeline due to the siphon effect, resulting in air trapped in the pipeline. This requires purging the pipeline before injection, increasing workload. For example, Chinese utility model patent CN207619011U discloses a leak-proof oil nozzle with a transition joint and a base that are sealed together. The oil pipe is quickly connected to the base through the oil pipe connection part on the base, and then experimental oil is injected into the submersible motor and the protector through the oil channel connecting the base and the transition joint, so as to achieve oil leakage-free input, save raw materials, and ensure environmental hygiene. However, the oil nozzle of this utility model is only equipped with one type of connector, which cannot be matched with different types of oil inlets, and the straight-through oil nozzle design is prone to oil backflow during use.

[0003] To address the above issues, Chinese utility model patent CN216619287U discloses a grease injection device, including a connecting section, a cylinder, and a check valve. The connecting section has a cavity with an injection port and a grease outlet on its shell wall. The check valve is located within the cavity, with its inlet connected to the injection port via an inlet pipe and its outlet connected to the grease outlet via an outlet pipe. The cylinder is fixed to the connecting section, and its output end is connected to the valve core of the check valve so that the annular groove on the valve core is misaligned with the injection port under the action of the cylinder. The check valve in this grease injection device solves the problem of oil backflow. However, the grease injector of this device only has one type of connector and cannot be matched with different types of injection ports. Utility Model Content

[0004] The purpose of this utility model is to provide a submersible electric pump oil filler nozzle to solve the technical problem that existing oil filler nozzles cannot quickly switch the oil outlet connector type to match the oil filler port of different types of submersible electric pump units.

[0005] To achieve the above objectives, this utility model provides a submersible electric pump filler nozzle, including a connecting section, an inlet pipe connector, and a metric or imperial outlet connector. The connecting section is a hollow tubular structure, with one end detachably connected to the inlet pipe connector. The other end of the connecting section is detachably connected in series with either a metric or imperial outlet connector, or vice versa. Alternatively, the outer surface of the connecting section is provided with a mounting base, and the first female thread of the imperial or metric outlet connector is connected to the male thread of the mounting base. The first female thread matches the second male thread of another metric or imperial outlet connector connected to the outlet of the connecting section for connecting to the filler port of the submersible electric pump unit.

[0006] Furthermore, a check valve is installed in the cavity opened within the connecting section. The oil inlet of the check valve is connected to the oil inlet of the connecting section, and the oil outlet of the check valve is connected to the oil outlet of the connecting section.

[0007] Furthermore, the one-way valve includes a hollow housing, a valve core, a spring, and a spring retaining ring. The housing has a valve seat with a flared conical structure extending from the inlet to the outlet. The valve core has a conical structure matching the flared conical structure. The conical structure of the valve core has a groove for embedding a sealing ring. The conical structure of the valve core and the conical structure of the valve seat are sealed together by the sealing ring. The outer diameter of the portion of the valve core away from the conical structure is smaller than the... The inner diameter of the housing forms a flow passage between the valve core and the housing. One end of the spring abuts against the end of the valve core away from the valve seat to apply a force to the valve core to block the valve seat. The other end of the spring abuts against the spring retainer to limit the spring. The spring retainer is fixedly connected to the inner wall of the oil outlet of the housing cavity. The end of the valve core away from the valve seat has a straightening and reset valve stem for the spring to be fitted on the straightening and reset valve stem. The spring is straightened and reset by the setting of the straightening and reset valve stem.

[0008] Furthermore, a sealing ring is provided between the outer wall of the single-flow valve housing and the inner wall of the connecting section to achieve a sealed connection between the two.

[0009] Furthermore, when the metric or imperial oil outlet connector connected to the oil outlet of the connecting short section is a metric connector, one end of the metric oil outlet connector is a first male thread connection section connected to the female thread of the oil outlet of the connecting short section, the middle part is a first external hexagonal screw section for transmitting torque, and the other end is a second male thread connection section connected to the oil inlet of the submersible electric pump unit and the female thread of another imperial oil outlet connector.

[0010] Furthermore, when the metric or imperial oil outlet connector connected to the oil outlet of the connecting short section is an imperial oil outlet connector, one end of the imperial oil outlet connector is a first male thread connection section with an external thread that connects to the female thread of the oil outlet of the connecting short section, the middle part is a first external hexagonal screw section for transmitting torque, and the other end is a second male thread connection section with a female thread that connects to the oil inlet of the submersible electric pump unit and another metric oil outlet connector.

[0011] Furthermore, one end of the oil inlet pipe connector is connected to the female thread of the oil inlet of the connecting short section via a male thread, and the oil inlet pipe connector is a quick-connect connector.

[0012] Furthermore, one end of the quick-connect fitting is a fourth male connection section that connects to the female thread of the oil inlet of the connecting short section, the middle part is a third external hexagonal screw section for transmitting torque, and the other end is a quick-connect section that connects to the female thread of the oil inlet pipe.

[0013] Furthermore, the quick-connect section consists of a necked section, a tapered section with decreasing outer diameter, and a guide section of equal diameter, from the end closest to the connecting section to the end furthest from the connecting section. The outer diameter of the necked section is smaller than the maximum outer diameter of the tapered section.

[0014] Furthermore, the outer surface of the quick-connect section is provided with quick-connect barbs for quick connection with the oil pipe.

[0015] Beneficial effects: This utility model is an improved invention. The oil nozzle of this utility model is equipped with both metric and imperial oil outlet connectors. When the type of the oil outlet connector installed on the connecting stub outlet is the same as the type of the oil inlet of the submersible electric pump unit to be connected, the oil outlet connector is directly connected to the oil inlet of the submersible electric pump unit. When the type of the oil outlet connector installed on the connecting stub outlet is different from the type of the oil inlet of the submersible electric pump unit to be connected, the connector of the other type is installed on the original type connector. At this point, the connector type of the oil filling nozzle is changed. The changed connector can be connected to the oil filling port of the submersible electric pump unit. Obviously, by setting different types of connectors on the oil filling nozzle, this application can achieve quick connection at the construction site, regardless of whether the oil filling port of the submersible electric pump unit is metric or imperial. This ensures construction efficiency, avoids damage to the unit's oil filling port and oil filling nozzle caused by forced installation, and solves the technical problem that the existing oil filling nozzle cannot quickly switch the oil outlet connector type to match different types of oil filling ports. Attached Figure Description

[0016] Figure 1 This is a half-sectional view of the oil injector of the submersible electric pump of this utility model;

[0017] Figure 2 This is a schematic diagram showing the connection between the oil injector of the submersible electric pump and the submersible electric pump unit of this utility model.

[0018] Figure 3 This is a cross-sectional view of the connecting short section of the oil injector of the submersible electric pump of this utility model.

[0019] Figure 4 This is a left view of the connecting section of the oil injector of the submersible electric pump of this utility model;

[0020] Figure 5 This is a cross-sectional view of the single-flow valve of the oil injector of the submersible electric pump of this utility model.

[0021] Figure 6 This is a half-sectional view of the metric oil outlet connector of the submersible electric pump nozzle of this utility model.

[0022] Figure 7 This is a half-sectional view of the imperial oil outlet connector of the submersible electric pump nozzle of this utility model.

[0023] Figure 8 This is a half-sectional view of the quick-connect fitting for the oil filler nozzle of the submersible electric pump of this utility model.

[0024] Figure 9 This is a structural diagram of the metric threaded oil inlet of the submersible electric pump of this utility model under working conditions.

[0025] Figure 10 This is a structural diagram of the inch-scale threaded oil inlet of the submersible electric pump of this utility model under working conditions.

[0026] The components include: 1. Quick-connect coupling; 2. Connecting sub; 3. Check valve; 4. Metric oil outlet connector; 5. Imperial oil outlet connector; 6. Inlet pipe female connector; 7. Submersible pump unit oil inlet; 11. Oil pipe connection; 12. Second through hole; 13. Fourth male external thread; 14. Third hexagonal thread; 21. Connecting sub inlet female thread; 22. Mounting seat; 23. Connecting sub inner cavity; 24. Connecting sub outlet female thread; 31. Valve seat; 32. First sealing ring; 33. Valve core; 34. Second sealing ring. 35. Sealing ring; 36. Spring retaining ring; 41. First protective cap; 411. Internal thread of the first protective cap; 412. First external hexagonal thread; 421. First external thread of the male; 422. Second external thread of the male; 423. Second external hexagonal thread; 424. First through hole; 51. Second protective cap; 511. Internal thread of the second protective cap; 512. Fourth external hexagonal thread; 521. First internal thread of the female; 522. Third external thread of the male; 523. Third through hole; 524. Fifth external hexagonal thread. Detailed Implementation

[0027] To address the problems in the background technology, the core inventive concept of this utility model is as follows: This utility model has a spare oil outlet connector of another type on the oil injector. The other type of oil outlet connector can be directly fitted onto the original oil outlet connector to change the external output type of the oil outlet pipe connector. This allows the external output connector type of the oil injector of this utility model to be quickly switched, meeting the connection requirements of the oil injection port of different types of submersible electric pump units, improving the adaptability of the oil injector, and ensuring construction efficiency.

[0028] The present invention will be further described in detail below with reference to an embodiment of the submersible electric pump nozzle.

[0029] like Figure 1 As shown, the oil injector of this utility model for a submersible electric pump includes an oil inlet pipe connector, a hollow connecting section 2, a check valve 3, a metric oil outlet connector 4, and an imperial oil outlet connector 5. The oil inlet pipe connector and the metric oil outlet connector 4 are threaded to the oil inlet and oil outlet of the connecting section 2, respectively. The imperial oil outlet connector 5 is threaded to the outer surface of the connecting section 2. The check valve 3 is sealed inside the hollow cavity of the connecting section 2. The oil inlet and oil outlet of the check valve 3 are respectively set to correspond to the oil inlet and oil outlet of the connecting section 2. By setting the check valve 3 inside the oil injector, the backflow of oil injected into the submersible electric pump unit can be prevented.

[0030] like Figure 2 As shown, when using the oil injector of this utility model, its oil inlet pipe connector is connected to the oil inlet pipe female head 6 of the oil injection device, and its oil outlet connector is connected to the oil injection port 7 of the submersible electric pump unit.

[0031] like Figure 3 and Figure 4 As shown, the connecting section 2 consists of an oil inlet threaded female 21, an inner cavity 23, and an oil outlet threaded female 24, from the oil inlet to the oil outlet. The outer surface of the connecting section 2 is provided with a mounting seat 22 for threaded connection with the inner threaded female of the imperial oil outlet connector 5 through an external male thread. The oil inlet and outlet of the connecting section 2 are located at the ends of the connecting section 2 in the axial direction. The mounting seat 22 is not connected to the cavity opened inside the connecting section 2.

[0032] like Figure 5As shown, the one-way valve 3 includes a hollow housing, a valve core 33, a spring 35, and a spring retaining ring 36. The housing is provided with a valve seat 31 having a conical flared structure. The valve core 33 is provided with a conical structure that matches the flared conical structure of the valve seat 31. The matching conical structure can increase the setting area of ​​the valve core 33 on the valve seat 31, thereby improving the reverse sealing effect of the one-way valve 3. The conical structure of the valve core 33 is provided with a groove for embedding the first sealing ring 32. The first sealing ring 32 is embedded in the groove. The groove achieves a seal between the valve seat 31 and the valve core 33. The first sealing ring 32 further enhances the setting effect of the valve core 33 on the valve seat 31. The portion of the valve core 33 away from the conical surface structure is cylindrical, with an outer diameter smaller than the inner diameter of the corresponding housing to form a flow channel between the valve core 33 and the housing, allowing oil to pass through. One end of the spring 35 abuts against the end of the valve core 33 away from the valve seat 31 to apply a force to the valve core 33 to seal it against the valve seat 31. The other end of the spring 35 abuts against the spring retainer 36 to limit the spring 35. Through the setting of the spring 35, when oil injection stops, the force of the spring 35 can limit the valve core 33 to the seated position, thereby preventing oil from flowing back through the check valve 3. The spring retainer 36 is fixedly connected to the inner wall of the oil outlet in the inner cavity of the housing. A centering and reset valve stem protrudes from the end of the valve core 33 away from the valve seat 31, allowing the spring 35 to be fitted onto the centering and reset valve stem. The centering and reset valve stem, through its setting, limits the spring... 35 is used to straighten and reset, preventing the spring 35 from tilting during reciprocating motion and failing to reset the valve core 33; a groove for embedding the second sealing ring 34 is provided on the outer surface of the one-way valve 3 housing; the outer wall of the one-way valve 3 and the inner wall of the connecting short section 2 are sealed together by the second sealing ring 34; the setting of the second sealing ring 34 can improve the sealing effect between the one-way valve 3 and the connecting short section 2, and prevent oil from flowing back from the connection between the one-way valve 3 and the connecting short section 2.

[0033] like Figure 1 and Figure 6 As shown, the metric oil outlet connector 4, from one end connected to the connecting short section 2 to the end away from the connecting short section 2, consists of a first external thread male thread 421 for connecting with the threaded female thread 24 of the connecting short section 2, a second external hexagonal thread 423, and a second external thread male thread 422 for connecting with the female thread of the oil inlet 7 of the submersible electric pump unit. The outer surface of the metric oil outlet connector 4 is provided with an external hexagonal thread for easy screwing and disassembly. A first protective cap 41 is threadedly connected to the metric oil outlet connector 4 to protect the second external thread male thread 422 of the metric oil outlet connector 4. The first protective cap 41 is provided with a first protective cap internal thread female thread 411 for matching the second external thread male thread 422 of the metric oil outlet connector 4. The outer surface of the first protective cap 41 is provided with a first external hexagonal thread 412 for easy screwing of the first protective cap 41.

[0034] like Figure 1 and Figure 7 As shown, the imperial oil outlet connector 5, from one end connected to the mounting base 22 to the end furthest from the mounting base 22, consists of, in sequence, a fifth external hexagonal thread 524, a first internal threaded female thread 521 for connection with the male thread of the mounting base 22, and a third external threaded male thread 522 for connection with the female thread of the submersible electric pump unit's oil inlet 7. The third external threaded male thread 522 is of imperial standard. The first internal threaded female thread 521 of the imperial oil outlet connector 5 is matched with the second external threaded male thread 422 of the metric oil outlet connector 4, so that the imperial oil outlet connector 5 can pass through the first... The internal thread 521 is threaded onto the second external thread 422 of the metric oil outlet connector 4, thereby converting the oil outlet connector of the oil nozzle from metric to imperial. The imperial oil outlet connector 5 is threaded onto a second protective cap 51 to protect the third external thread 522 of the imperial oil outlet connector 5. The second protective cap 51 is provided with a second protective cap internal thread 511 for matching the third external thread 522 of the imperial oil outlet connector 5. The outer surface of the second protective cap 51 is provided with a fourth external hexagon 512 to facilitate screwing the second protective cap 51.

[0035] like Figure 1 and Figure 8 As shown, the oil inlet pipe connector is a quick-connect connector 1. The quick-connect connector 1 consists of, from one end connected to the connecting short section 2 to the end away from the connecting short section 2, a fourth external male thread 13 for connecting with the threaded female thread 21 of the connecting short section 2, a third external hexagonal thread 14, and an oil pipe connection part 11 for connecting with the oil inlet pipe female head 6 of the oil injection device. The oil pipe connection part 11 consists of, from one end near the connecting short section 2 to the end away from the connecting short section 2, a necked section, a tapered section with an outer diameter decreasing from large to small, and a guide section of equal diameter. The outer diameter of the necked section is smaller than the maximum outer diameter of the tapered section, so that the oil inlet pipe female head 6 of the oil injection device can be quickly fitted onto the oil pipe connection part 11. Then, by using a metal wire to tighten the oil inlet pipe onto the oil pipe connection part 11 at the necked section, the quick assembly of the oil inlet pipe and the quick-connect connector can be achieved. Using the quick-connect connector 1 as the oil inlet pipe connector can significantly improve the efficiency of oil inlet pipe disassembly and assembly, thereby improving the overall oil injection construction efficiency.

[0036] When using the oil filler nozzle of this utility model, first determine the thread type of the oil filler port 7 of the submersible electric pump unit, and select a matching oil filler connector. For example, if the oil filler port 7 of the submersible electric pump unit is a metric thread type, then remove the first protective cap 41. Figure 9 As shown, holding the connecting short section 2, tighten the second external male thread 422 of the metric oil outlet connector 4 onto the internal thread of the submersible electric pump unit's oil inlet 7; if the submersible electric pump unit's oil inlet 7 is of imperial type, remove the second protective cap 51, as... Figure 10As shown, unscrew the imperial oil outlet connector 5 from the mounting base 22 of the connecting short section 2, tighten the first internal female thread 521 of the imperial oil outlet connector 5 onto the second external male thread 422 of the metric oil outlet connector 4, hold the connecting short section 2, and tighten the third external male thread 522 of the imperial oil outlet connector 5 onto the internal thread of the oil inlet 7 of the submersible electric pump unit. Insert the female inlet pipe 6 of the oil injection device into the oil pipe connection part 11 of the quick-connect connector 1. The oil injection device inputs motor oil at a certain pressure into the quick-connect connector 1 through the oil inlet pipe. The motor oil enters the valve seat 31 of the one-way valve 3 through the second through hole 12 of the quick-connect connector 11, presses the valve core 33, enters the valve chamber, passes through the spring retainer 36, flows into the metric oil outlet connector 4, and then enters the inner cavity of the unit through the oil injection port 7 of the submersible electric pump unit. When enough motor oil is added, stop the oil injection. The spring 36 pushes the valve core 33 to make the valve core 33 sit on the valve seat 31, so that the one-way valve 3 is closed to prevent oil backflow. After the oil injection is completed, remove the oil injection nozzle and install the first protective cap 41 and the second protective cap 51.

[0037] In the above embodiments, one end of the oil inlet pipe connector is connected to the female thread of the oil inlet of the connecting short section 2 via a male thread. In other embodiments, the oil inlet pipe connector can be integrally formed with the connecting short section 2.

[0038] In the above embodiments, one end of the metric oil outlet connector 4 is connected to the female thread of the oil outlet of the connecting stub 2 via a male thread. In other embodiments, the metric oil outlet connector can be integrally formed with the connecting stub 2.

[0039] In the above embodiment, the oil outlet connected to the connecting stub 2 is a metric oil outlet connector 4, and the spare connector is an imperial oil outlet connector 5. In other embodiments, the oil outlet connected to the connecting stub 2 is an imperial oil outlet connector 5, and the spare connector is a metric oil outlet connector 5.

[0040] In the above embodiments, the male and female buckles are connected by internal and external threads. In other embodiments, the male and female buckles are connected by a plug-in type connection. After the male buckle end is inserted into the female buckle sleeve, the female buckle is clamped from the outside, and the male buckle is clamped by elastic deformation.

[0041] In the above embodiments, the male and female buckles are connected by internal and external threads. In other embodiments, the male and female buckles are connected by a flared connection. The end of the female buckle is flared and pressed against the conical surface of the male buckle. The flared structure achieves a sealed connection between the male and female buckles.

[0042] In the above embodiments, the male and female buckles are connected by internal and external threads. In other embodiments, the male and female buckles are connected by a quick-connect type, and the outer surface of the male buckle is provided with quick-connect barbs for quick connection with the female buckle.

[0043] In the above embodiments, the oil inlet and outlet of the connecting section 2 are located at the ends of both ends in the axial direction of the connecting section 2, while in other embodiments, at least one of the oil inlet and outlet of the connecting section 2 is opened on the side wall in the radial direction of the connecting section 2.

[0044] In other embodiments, the oil pipe connection can be of other structures, such as having quick-connect barbs on the outer surface of the oil pipe connection that can be quickly connected to the inlet pipe female head 6.

[0045] In other embodiments, the housing of the one-way valve 3 can be integrally formed with the inner cavity of the connecting section 2, that is, the housing of the connecting section 2 constitutes the valve body of the one-way valve 3.

[0046] In other embodiments, the valve core 33 of the one-way valve 3 can be a valve ball, and the valve seat 31 can also be a conventional cylindrical valve seat. The valve ball is pressed and sealed on the valve seat 31 by the spring 35 to achieve unidirectional flow of oil.

[0047] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different types of specific implementation methods to create the specific implementation methods shown in the accompanying drawings. Of course, those skilled in the art can also create other specific implementation methods not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A submersible electric pump lubricator comprising a connecting nipple, an inlet pipe joint and a metric or imperial outlet joint, the connecting nipple being of a hollow tubular construction, the connecting nipple being removably connected at one end to the inlet pipe joint, characterised in that: The other end of the connecting short section is detachably connected in series with metric and imperial oil outlet connectors, or detachably connected in series with imperial and metric oil outlet connectors; or, the outer surface of the connecting short section is provided with a mounting base, and the first female thread of the imperial or metric oil outlet connector is connected to the male thread of the mounting base, and the first female thread is matched with the second male thread of another metric or imperial oil outlet connector connected to the oil outlet of the connecting short section for connecting to the oil inlet of the submersible electric pump unit.

2. The submersible electric pump injector according to claim 1, characterized in that: A check valve is installed in the cavity opened in the connecting section. The oil inlet of the check valve is connected to the oil inlet of the connecting section, and the oil outlet of the check valve is connected to the oil outlet of the connecting section.

3. The submersible electric pump injector according to claim 2, characterized in that: The one-way valve includes a hollow housing, a valve core, a spring, and a spring retainer. The housing has a valve seat with an flared conical structure extending from the valve inlet to the outlet. The valve core has a conical structure matching the flared conical structure, and the conical structure of the valve core has a groove for embedding a sealing ring. The conical structure of the valve core and the conical structure of the valve seat are sealed together by the sealing ring. The outer diameter of the portion of the valve core away from the conical structure is smaller than the inner diameter of the housing to form a flow channel between the valve core and the housing. One end of the spring abuts against the end of the valve core away from the valve seat to apply a force to the valve core to block the valve seat. The other end of the spring abuts against the spring retainer to limit the spring's position. The spring retainer is fixedly connected to the inner wall of the outlet of the housing cavity. A centering and resetting valve stem protrudes from the end of the valve core away from the valve seat for the spring to be fitted onto. The centering and resetting valve stem centers and resets the spring.

4. The submersible electric pump injector according to claim 3, characterized in that: A sealing ring is provided between the outer wall of the single-flow valve housing and the inner wall of the connecting section to achieve a sealed connection between the two.

5. The submersible electric pump injector according to claim 1 or 2, characterized in that: When the metric or imperial oil outlet connector connected to the oil outlet of the connecting short section is a metric connector, one end of the metric oil outlet connector is a first male thread connection section that connects to the female thread of the oil outlet of the connecting short section, the middle part is a first external hexagonal screw section for transmitting torque, and the other end is a second male thread connection section that connects to the oil inlet of the submersible electric pump unit and the female thread of another imperial oil outlet connector.

6. The submersible electric pump injector according to claim 1 or 2, characterized in that: When the metric or imperial oil outlet connector connected to the oil outlet of the connecting short section is an imperial oil outlet connector, one end of the imperial oil outlet connector is a first male thread connection section with an external thread that connects to the female thread of the oil outlet of the connecting short section, the middle part is a first external hexagonal screw section for transmitting torque, and the other end is a second male thread connection section with a female thread that connects to the oil inlet of the submersible electric pump unit and another metric oil outlet connector.

7. The submersible electric pump injector according to claim 1, characterized in that: One end of the oil inlet pipe connector is connected to the female thread of the oil inlet of the connecting short section via a male thread, and the oil inlet pipe connector is a quick-connect connector.

8. The submersible electric pump injector according to claim 7, characterized in that: The quick-connector has a fourth male connection section at one end that connects to the female thread of the oil inlet of the connecting short section, a third external hexagonal screw section in the middle for transmitting torque, and a quick-connect section at the other end that connects to the female thread of the oil inlet pipe.

9. The submersible electric pump injector according to claim 8, characterized in that: The quick-connect section consists of a necked section, a tapered section with decreasing outer diameter, and a guide section of equal diameter, extending from the end closest to the connecting section to the end furthest from the connecting section. The outer diameter of the necked section is smaller than the maximum outer diameter of the tapered section.

10. The submersible electric pump injector according to claim 8, characterized in that: The outer surface of the quick-connect section is provided with quick-connect barbs for quick connection with oil pipes.

Images