Oil-submerged pump and pump head for oil-submerged pump

Abstract

The invention relates to a pump head for an oil-submerged pump, and the pump head comprises a base which comprises a vertical pipe mounting port, a cover body mounting port, an overflowing channel, a capacitor cavity and a wiring cavity, and the vertical pipe mounting port is connected to an oil storage tank; the cover body comprises a first end face, a second end face and a connecting column, the first end face is arranged on the cover body mounting opening, and the second end face extends into the base; the connecting column is connected between the first end face and the second end face, and the connecting column comprises an oil channel and an electrical channel which are arranged in parallel; the valve assembly is arranged in the oil liquid channel of the cover body through the first end face of the cover body. The capacitor is arranged in the capacitor cavity of the base; the junction box is arranged in the wiring cavity of the base and is connected with the capacitor; wherein the valve assembly comprises a one-way valve and a pressure release valve, and the one-way valve is used for controlling oil to pass through; the pressure release valve is arranged in the one-way valve and used for controlling and adjusting the pressure impacting the one-way valve. According to the pump head, multiple functions can be integrated into one module for use, and the size and the weight of the pump head can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of refueling equipment, and particularly to a submersible pump and a pump head for the submersible pump. Background Art

[0002] In the fuel delivery system of a gas station, as a core power device, the submersible pump is usually installed on the top riser structure of the storage tank through a flange. Generally, the storage tank is buried underground at the gas station, and a manhole is provided at the top riser structure. All daily operations that require manual operation, such as the installation and maintenance of the submersible pump, need to be completed by construction workers in the manhole. The submersible pump consists of a pump head, a pump pipe, and a submersible motor unit. When the submersible pump is installed on the storage tank, the pump head part is exposed in the manhole, the pump pipe extends into the storage tank, and the submersible motor is immersed in the oil. When refueling is required, the fuel nozzle is lifted, the control relay receives the signal and drives the corresponding submersible pump to work, realizing the delivery of fuel from the storage tank to the fuel dispenser.

[0003] However, the pump head of the submersible pump needs to be provided with an installation structure connected to the pump pipe, and also needs to have a power supply introduction structure, such as a junction box, a capacitor chamber, an explosion-proof connection device, etc., as well as related functions for fluid control, such as modules like check valves and siphon valves. Thus, the shape of the liquid flow channel in the pump head is complex. To meet the different requirements of the submersible pump, the pump head is realized by multiple different modules respectively. For example, the check valve and the siphon valve are arranged separately, resulting in that the submersible pump head needs multiple interfaces to correspond to valves with different functions, the pump head is too large in volume, high in manufacturing cost, and also relatively heavy in weight, making the installation and transportation operations difficult. Summary of the Invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a pump head for a submersible oil pump, comprising: a base including a riser installation port, a cover installation port, a flow-through channel, a capacitor chamber, and a wiring chamber, wherein the riser installation port is connected to an oil storage tank, the cover installation port is opposite to the riser installation port, and the flow-through channel communicates with the riser installation port and the cover installation port; a cover including a first end face, a second end face, and a connecting column, the first end face is disposed on the cover installation port of the base to seal the base, the second end face extends into the base and divides the flow-through channel into an upper flow-through channel and a lower flow-through channel, the lower flow-through channel communicates with the oil storage tank; the connecting column is connected between the first end face and the second end face, and the connecting column includes an oil passage and an electrical passage arranged in parallel, the oil passage and the electrical passage penetrate through the first end face and the second end face, and the oil passage communicates with the upper flow-through channel; a valve assembly disposed in the oil passage of the cover by the first end face of the cover for controlling the passage of oil; a capacitor disposed in the capacitor chamber of the base; and a junction box disposed in the wiring chamber of the base and connected to the capacitor; wherein, the valve assembly includes a check valve and a pressure relief valve, the check valve is used for controlling the passage of oil; the pressure relief valve is disposed in the check valve for controlling and regulating the pressure impacting the check valve.

[0005] For the pump head for a submersible oil pump as described above, the connecting column extends into the lower flow-through channel and is connected to a pump pipe.

[0006] For the pump head for a submersible oil pump as described above, at least a part of the connecting column between the first end face and the second end face is hollowed out to increase the flow area between the oil passage and the upper flow-through channel.

[0007] For the pump head for a submersible oil pump as described above, the base includes one or more oil outlets disposed on the side wall of the base and communicating with the upper flow-through channel.

[0008] For the pump head for a submersible oil pump as described above, the valve assembly includes: a valve cover, a valve seat, and a valve core, the valve cover is disposed on the first end face of the cover, the valve seat is disposed on the second end face of the cover, the first end of the valve core extends into the valve cover, and the second end abuts against or is away from the valve seat. When the valve core is in the first position, the valve core abuts against the valve seat, and when the valve core is in the second position, the valve core is away from the valve seat.

[0009] For the pump head for a submersible oil pump as described above, the valve core includes an installation hole axially penetrating therethrough.

[0010] The pump head for a submersible oil pump as described above, wherein the valve assembly includes a pressure regulating valve rod which is disposed in the mounting hole and is axially movable along the mounting hole.

[0011] The pump head for a submersible oil pump as described above, wherein the valve assembly may further include a vacuum channel which is connected between the valve cover and the base and communicates between the outside of the pump head and the first position of the valve core.

[0012] The pump head for a submersible oil pump as described above, wherein the valve core includes a diversion cone which includes a conical surface extending and gradually contracting along the base, and the cone angle of the conical surface is 50° - 70°.

[0013] According to another aspect of the present application, a submersible oil pump is provided, which includes the pump head for a submersible oil pump as described above.

[0014] The pump head of the present application integrates multiple functions such as a check valve, a pressure relief valve, a siphon valve, a vacuum channel, a lifting ring, etc. into one module, which is relatively simple to use, saves materials, has a low manufacturing cost, is also beneficial to reducing the volume and weight of the pump head, can reduce costs, and can reduce the labor intensity of handling the pump head during installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Next, the preferred embodiments of the present invention will be further described in detail with reference to the drawings, wherein:

[0016] Figure 1 is a schematic structural diagram of a submersible oil pump according to an embodiment of the present application;

[0017] Figure 2 is an exploded view of a submersible oil pump according to an embodiment of the present application;

[0018] Figure 3 is a schematic structural diagram of a pump pipe assembly according to an embodiment of the present application;

[0019] Figure 4 is a schematic diagram of an adjusting device according to an embodiment of the present application;

[0020] Figure 5 is an exploded view of an adjusting device according to an embodiment of the present application;

[0021] Figure 6 is a schematic diagram of a motor connecting seat according to an embodiment of the present application;

[0022] Figure 7A and Figure 7B is a schematic diagram of the structures of both end faces of a motor connecting seat according to an embodiment of the present application;

[0023] Figure 8A and Figure 8B is a cross-sectional view of a motor connecting seat according to an embodiment of the present application;

[0024] Figure 9 Schematic diagram of a pump head according to an embodiment of the present application;

[0025] Figure 10 Top view of a pump head according to an embodiment of the present application;

[0026] Figures 11A - 11D Cross-sectional view of a pump head according to an embodiment of the present application;

[0027] Figure 12 Exploded view of a pump head according to an embodiment of the present application;

[0028] Figure 13 Schematic diagram of a valve assembly according to an embodiment of the present application;

[0029] Figure 14 Cross-sectional view of a valve assembly according to an embodiment of the present application;

[0030] Figure 15 Schematic diagram of the structure of a pump head according to another embodiment of the present application;

[0031] Figure 16 Top view of a pump head according to another embodiment of the present application;

[0032] Figures 17A - 17E Cross-sectional view of a pump head according to another embodiment of the present application;

[0033] Figure 18 Exploded view of a pump head according to another embodiment of the present application;

[0034] Figure 19 Schematic diagram of a valve assembly according to another embodiment of the present application;

[0035] Figure 20 Cross-sectional view of a valve assembly according to another embodiment of the present application;

[0036] Figure 21 Schematic diagram of the structure of a siphon valve according to another embodiment of the present application;

[0037] Figure 22A and Figure 22B Cross-sectional view of the structure of a siphon valve according to another embodiment of the present application; and

[0038] Figure 23 Exploded view of the structure of a siphon valve according to another embodiment of the present application. Detailed implementation manners

[0039] The principles and spirit of the present application will be described below with reference to several exemplary embodiments. It should be understood that the purpose of providing these embodiments is to make the principles and spirit of the present application clearer and more thorough, so that those skilled in the art can better understand and then implement the principles and spirit of the present application. The exemplary embodiments provided herein are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments herein without creative efforts fall within the scope of protection of the present application.

[0040] In the following detailed description, reference may be made to the various specification drawings that form a part of the present application and illustrate specific embodiments of the present application. In the drawings, like reference numerals generally describe substantially similar components in different figures. The various specific embodiments of the present application are described in sufficient detail below so that those of ordinary skill in the relevant art can implement the technical solutions of the present application. It should be understood that other embodiments may also be used or structural, logical, or electrical changes may be made to the embodiments of the present application. In addition, similar terms such as first, second, and third in the present application are only used to distinguish one entity (or operation) from another entity (or operation), and do not require or imply any order or association between these entities (or operations).

[0041] The present application proposes a novel pump head structure, which optimizes the shapes of the liquid flow channel and the electrical flow channel inside the pump head. The liquid flow channel and the electrical channel are arranged separately and do not interfere with each other. The structure is simple, the appearance is compact, and the weight is small. Thus, various functions such as check valves, pressure relief valves, siphon valves, vacuum channels, and lifting rings can be integrated into one module, which is relatively simple to use, saves materials, has a low manufacturing cost, and is also beneficial to reducing the volume and weight of the pump head, can reduce costs, and can reduce the labor intensity of handling the pump head during installation and maintenance.

[0042] The technical solutions of the present application will be further described below through specific embodiments. Those skilled in the art should understand that under the inspiration of the following embodiments, there may still be other alternative solutions that can achieve the same or similar functions. These alternative solutions also fall within the scope of protection of the present application.

[0043] Figure 1 FIG. [ID] is a schematic structural diagram of a submersible oil pump according to an embodiment of the present application. Figure 2 FIG. [ID] is an exploded view of a submersible oil pump according to an embodiment of the present application.

[0044] As shown in the figure, the submersible oil pump 100 includes a submersible motor 110, a pump pipe assembly 120, and a pump head 130. Among them, the submersible motor 110 can be arranged in the storage oil tank, the pump head 130 is arranged on the riser structure at the top opening of the storage oil tank, and the pump pipe assembly 120 is connected between the submersible motor 110 and the pump head 130. When refueling is required, after the submersible motor is powered on, the submersible motor can do work on the oil fluid, so as to pressurize the oil fluid and send it into the fueling pipeline through the pump pipe and the pump head; the pump head 130 introduces the power supply, supplies power to the submersible motor through the pump pipe assembly, and at the same time conveys the pressurized oil fluid output by the submersible motor to the fuel dispenser; one end of the pump pipe assembly is connected to the pump head, and the other end is connected to the submersible motor, which can connect the power supply introduced by the pump head to the submersible motor, and convey the pressurized oil fluid output by the submersible motor to the pump head.

[0045] The detailed structures of each part of the submersible oil pump will be described in detail below. As understood by those skilled in the art, no improvement has been made to the submersible motor in this application, and it can be a submersible motor of any structure in the art, which will not be elaborated here.

[0046] Figure 3 It is a schematic structural diagram of a pump pipe assembly according to an embodiment of the present application.

[0047] As shown in the figure, the pump pipe assembly 300 includes a pump pipe and a motor connection seat 330. Among them, the motor connection seat 330 is connected to one end of the pump pipe, and can connect the pump pipe to the submersible motor, supply power to the submersible motor, and output the oil fluid conveyed by the submersible motor.

[0048] In some embodiments, the pump pipe may include: an oil circuit pipe 310 and an electric circuit pipe 320. Among them, the electric circuit pipe 320 is arranged outside the oil circuit pipe 310 and is arranged in parallel with the oil circuit pipe 310, so that there are no parts in the oil circuit pipe that occupy the flow area, the frictional resistance along the flow of the oil fluid is small, which is beneficial to reducing the operating power of the submersible oil pump, so that the submersible oil pump can provide more oil fluid to the fuel dispenser under the same power consumption. For example: taking a 2-inch pump pipe as an example, compared with the prior art, the flow area of the oil circuit pipe in this application can be increased by 18% - 39%. And the electric circuit pipe is arranged outside the oil circuit pipe, which is convenient to inspect the electric circuit pipe. When there are problems with the electric circuit pipe or the cable in the electric circuit pipe, the electric circuit pipe can be easily disassembled directly to eliminate the faults, and the inspection and later maintenance operations are convenient and flexible.

[0049] In some embodiments, the oil pipeline 310 and the circuit pipeline 320 are straight pipes, which can be made of seamless steel pipes or aluminum profile pipes, and the materials can be Q235 or 6061 grade, etc. In some embodiments, both ends of the oil pipeline 310 and the circuit pipeline 320 include connecting threads, which can be used to connect with the motor connection seat and the pump head. In some embodiments, the size of the oil pipeline 310 can be 2 inches, or other smaller sizes; the size of the circuit pipeline 320 does not exceed 0.85 inches.

[0050] In some embodiments, the oil pipeline 310 and the circuit pipeline 320 can also be adjustable pump pipes, the lengths of which can be adjusted, so that the submersible pump can adapt to storage oil tanks of different sizes, increasing the applicable range of the submersible pump. In some embodiments, the oil pipeline 310 can include a first oil pipeline section 311 and a second oil pipeline section 312. Among them, one end of the first oil pipeline section 311 extends into the second oil pipeline section 312 from one end of the second oil pipeline section 312 and can axially expand and contract along the second oil pipeline section 312, so as to adjust the length of the oil pipeline; the circuit pipeline 320 can include a first circuit pipeline section 321 and a second circuit pipeline section 322. One end of the first circuit pipeline section 321 extends into the second circuit pipeline section 322 from one end of the second circuit pipeline section 322 and can axially expand and contract along the second circuit pipeline section 322, so as to adjust the length of the circuit pipeline.

[0051] In some embodiments, the pump pipe assembly can also include an adjusting device 340, which can be arranged on the oil pipeline 310 and / or the circuit pipeline 320 to adjust the lengths of the oil pipeline and the circuit pipeline. In some embodiments, the adjusting device 340 can include a first holding member, a second holding member and a connecting member. Among them, the first holding member can be arranged at the end of the second oil pipeline section 312 that houses the first oil pipeline section 311, the second holding member is arranged on the first oil pipeline section 311, and the connecting member is connected between the first holding member and the second holding member to fix the distance between the first holding member and the second holding member. Through the connecting member, the position and distance between the first holding member and the second holding member can be restricted. Among them, when the second holding member is in the locked state, the first oil pipeline section and the second oil pipeline section are locked. When the second holding member is in the unlocked state, the first oil pipeline can axially expand and contract along the second oil pipeline section. In some embodiments, the first holding member can also be arranged at the end of the second circuit pipeline section 322 that houses the first circuit pipeline section 321, and the second holding member is arranged on the first circuit pipeline section 321. In some embodiments, at least part of the first holding member and / or the second holding member extends outward to form a circuit pipeline accommodating portion for accommodating the second circuit pipeline, which can prevent the circuit pipeline from shifting, and the circuit pipeline can follow the oil pipeline for telescopic adjustment.

[0052] Combined with Figure 4 and Figure 5 , Figure 4Schematic diagram of an adjusting device according to an embodiment of the present application. Figure 5 Exploded view of an adjusting device according to an embodiment of the present application.

[0053] According to an embodiment of the present application, the first holding member may include: a first clamp 341, a second clamp 342, and a first fastener 343. The first clamp 341 and the second clamp 342 may be clamped around one end of the second oil pipeline. The first fastener 343 fastens the first clamp and the second clamp. The second holding member may include: a third clamp 344, a fourth clamp 345, and a second fastener 346. The third clamp 344 and the fourth clamp 345 may be clamped around the first oil pipeline. The second fastener 346 fastens the third clamp 344 and the fourth clamp 345. The connecting member may be a first connecting piece 347 and a second connecting piece 348. The first connecting piece 347 and the second connecting piece 348 are connected between the first fastener and the second fastener. When the third clamp 344 and the fourth clamp 345 are clamped around the first oil pipeline, the first oil pipeline and the second oil pipeline are locked and cannot be telescoped. When the third clamp 344 and the fourth clamp 345 are not clamped around the first oil pipeline, the first oil pipeline can be telescoped along the axial direction of the second oil pipeline. In some embodiments, the first fastener and the second fastener may be screws. Such as screws with a specification of M6 or M8.

[0054] In some embodiments, when the first clamp 341 and the second clamp 342 can be clamped around one end of the second oil pipeline, and the third clamp 344 and the fourth clamp 345 can be clamped around the first oil pipeline, there is a certain gap between the first clamp and the second clamp, and between the third clamp and the fourth clamp to ensure clamping on the oil pipeline. In some embodiments, the first connecting piece 347 and the second connecting piece 348 are disposed in the gaps between the first clamp and the second clamp, and between the third clamp and the fourth clamp, and do not contact the first clamp, the second clamp, the third clamp, or the fourth clamp to prevent failure to clamp the oil pipeline.

[0055] In some embodiments, the end of the second oil pipeline connected to the adjusting device may further include a connecting portion for connecting to the first clamp 341 and the second clamp 342. In some embodiments, the connecting portion may include threads, thereby increasing the friction between the second oil pipeline and the adjusting device and increasing the connection strength. Correspondingly, the inner surface of the first clamp 341 and / or the second clamp 342 may also include threads.

[0056] In some embodiments, the circuit pipe accommodating portion may include a depression 349 extending outward from the first clamp 341 and / or the third clamp 344. The second circuit pipe may be accommodated in the depression 349 to prevent the circuit pipe from shifting during the telescoping process.

[0057] The adjusting device of the present application only requires several fasteners to fasten two clamping members into a locked state. The fastening operation is simple, labor-saving and effortless. The adjusting device has a recess extending outward, through which other pipelines can pass, such as the threading pipe of a submersible motor, etc., which can create a flow-through space inside the oil pipe. Moreover, the adjusting device of the present application can be easily assembled and disassembled on the pump pipe. In case of damage to parts, it can be replaced on-site at the oil station, and the operation of use and maintenance is flexible.

[0058] Combined with Figure 6 , Figure 7A and Figure 7B to Figure 8A and Figure 8B . Figure 6 FIG. is a schematic diagram of a motor connection seat according to an embodiment of the present application. Figure 7A and Figure 7B FIG. are schematic diagrams of the end face structures of both ends of a motor connection seat according to an embodiment of the present application. Figure 8A and Figure 8B FIG. are cross-sectional views of a motor connection seat according to an embodiment of the present application.

[0059] In some embodiments, the motor connection seat 330 includes a seat body 331, inside which there are provided multiple oil passage channels 332 and circuit passage channels 333. Referring to Figure 7A , at one end of the motor connection seat 330 connected to the oil pipeline 310 and the circuit pipeline 320, multiple oil passage channels converge at one place and are arranged side by side at intervals with the circuit passage channel 333, so as to be connected to the parallel oil pipeline 310 and circuit pipeline 320; referring to Figure 7B , at one end of the motor connection seat 330 connected to the submersible motor, the circuit passage channel 333 is arranged at the center, and the oil passage channels 332 are arranged around the circuit passage channel 333, so as to be connected to the submersible motor. In some embodiments, at the connection between the oil passage channel and the oil pipeline, and at the connection between the circuit passage channel and the circuit pipeline, there are connection threads.

[0060] In some embodiments, the cable plug can be inserted into the submersible motor through the circuit passage channel 333. The circuit passage channel 333 may further include a plug positioning groove 3331, which can accommodate and position the cable plug. Thus, when the motor connection seat is connected to the submersible motor, the cable plug can be inserted into the submersible motor to supply power to the submersible motor. In some embodiments, the circuit passage channel 333 may further include a sealing groove 3332, which can be used to accommodate a sealing ring to prevent oil from entering the circuit pipeline 320 through the circuit passage channel 333 or affecting the connection between the cable plug and the submersible motor.

[0061] In some embodiments, the seat body 331 can be formed by casting, and its outer dimensions gradually shrink from the end connected to the submersible motor to the end connected to the pump pipe. In some embodiments, the outer periphery of the seat body may further include a plurality of reinforcing ribs 3311, which are connected to both ends of the seat body 331, and can increase the structural strength of the seat body. In some embodiments, an inclined channel 3333 is provided in one of the reinforcing ribs, which is part of the circuit channel, and can move the circuit channel from the center of the end connected to the submersible motor to be arranged side by side with the oil circuit channel at the end connected to the pump pipe. In some embodiments, the plurality of reinforcing ribs 3311 can also be arranged at intervals from the plurality of oil circuit channels, or rather, the plurality of reinforcing ribs can divide the oil circuit channels into multiple ones, and each oil circuit channel corresponds to the oil outlet flow channel of the submersible motor.

[0062] In some embodiments, the end of the seat body 331 connected to the submersible motor may further include an outer edge 3312, which can extend outward perpendicular to the outer surface of the seat body along the plane where it is located. Among them, the outer edge 3312 may include a connecting portion, which can be used for connecting the motor connecting seat to the submersible motor. In some embodiments, the connecting portion may include one or more connecting holes 3313, and the connecting holes 3313 can be arranged at equal intervals along the circumferential direction of the outer edge, so as to be used for accommodating fasteners (such as bolts, etc.) to pass through and connect the motor connecting seat to the submersible motor. In some embodiments, the outer edge may further include a limiting portion, such as a positioning pin hole 3314, which can be used for circumferential positioning of the motor connecting seat and the submersible motor. On the one hand, it can align the flow channels of the motor connecting seat and the submersible motor, and on the other hand, it can align the cable plug and the submersible motor terminal provided in the circuit channel. In some embodiments, the material of the seat body can be metal. Such as: ASTM A356 or HT200, etc.

[0063] The pump pipe assembly of the present application can be used as a connecting piece between the submersible pump head and the submersible motor. One end is installed on the pump head, and the other end is connected to the submersible motor. Among them, the interface dimensions of the motor connecting seat for the submersible motor are the same as those of the existing products, and the existing submersible motors can fully cooperate with the pump pipe assembly of the present application. And the pump pipe assembly of the present application separates the circuit pipe and the oil pipe, and the structure of the pump head docked with it can be designed relatively simply. The present application further optimizes the structure of the pump head.

[0064] Figure 9 It is a schematic diagram of a pump head according to an embodiment of the present application. Figure 10 It is a top view of a pump head according to an embodiment of the present application. Figures 11A - 11D It is a cross-sectional view of a pump head according to an embodiment of the present application. Figure 12 It is an exploded view of a pump head according to an embodiment of the present application.

[0065] As shown in the figure, the pump head 900 includes a base 910, a cover 920, a valve assembly 930, a capacitor 940, and a junction box 950. Among them, the cover 920 is disposed on the base 910 and can enclose the base 910; the valve assembly 930 can be disposed on the cover and can be used to control the oil passing through the pump head. The capacitor 940 can be disposed on the base. The junction box 950 is connected to the capacitor 940 and can be disposed on the base and can be used for the pump head to connect to an external power source. In some embodiments, the pump head 900 may further include a wire passing bridge 970, which is connected between the capacitor 940 and the cover 920 and can be used to connect and isolate the capacitor cavity and the circuit pipe, so that the submersible pump meets the requirements of explosion-proof design, separating the capacitor cavity and the wire passing pipe into two independent cavities.

[0066] In some embodiments, the base 910 is generally cylindrical as a whole and includes: a riser installation port 911, a cover installation port 912, a flow-through channel 913, a capacitor cavity 914, and a wiring cavity 915. Among them, the riser installation port 911 is used for the base to be connected to the riser of the storage tank; the cover installation port 912 is used to be connected to the cover 920; the flow-through channel 913 is disposed between the riser installation port 911 and the cover installation port 912 and is in communication with the riser installation port 911 and the cover installation port 912; the capacitor cavity 914 and the wiring cavity 915 are disposed on one side of the base and are parallel to the axis of the flow-through channel 913.

[0067] In some embodiments, the riser installation port 911 may include threads, and the base can be connected to the top riser of the storage tank through threaded connection. In some embodiments, the cover installation port 912 includes a limit groove, which is used for positioning when the cover 920 is connected to the base.

[0068] In some embodiments, the capacitor cavity is a cavity with an opening at one end, and the wiring cavity is a cavity with openings at both ends. In some embodiments, the capacitor cavity and the wiring cavity are adjacent to each other, and a wire passing hole is provided therebetween, which can be used for circuit connection. In some embodiments, the base 910 may further include a wiring cavity cover 916, which can be disposed at one end of the wiring cavity. The power cord at the gas station site can enter from the open end of the wiring cavity and complete wiring with the capacitor and the junction box in the wiring cavity. In some embodiments, the base 910 may further include a capacitor cavity cover (not shown in the figure), which can be used to enclose the capacitor cavity.

[0069] In some embodiments, the base 910 may further include an oil outlet 917, which is disposed on the side wall of the base and communicates with the flow-through channel 913. It can be used to connect to the pipeline of the fuel dispenser and output the oil fluid. In some embodiments, the direction of the oil outlet is parallel to the axial direction of the flow-through channel, which is conducive to increasing the diameter of the oil outlet. In some embodiments, the direction of the outlet may also be perpendicular to the axial direction of the flow-through channel. In some embodiments, the base 910 may further include a plurality of oil outlets, which may be spaced apart in the circumferential direction of the base. In some embodiments, the part of the oil outlet connected to the flow-through channel makes full use of the projection area on the oil outlet side of the pump head base. The lateral side uses an area close to a rectangle and gradually transitions to the oil outlet. And during the transition process, the flow direction of the oil fluid changes from radial to axial. In this way, the flow area of the oil fluid can be fully expanded, the flow resistance can be reduced, and the space size of the pump head base can also be reduced, making its shape compact.

[0070] In some embodiments, the cover 920 includes a first end face 921, a second end face 922, and a connecting column 923. Among them, the first end face 921 is disposed on the cover mounting opening 912 of the base 910 and can seal the base; the second end face 922 extends into the base and is located in the flow-through channel 913 of the base; the connecting column 923 is connected between the first end face 921 and the second end face 922.

[0071] In some embodiments, the shape of the first end face 921 is the same as the shape of the cover mounting opening on the base and is located in the cover mounting opening. The first end face can be pressed tightly on the cover mounting opening by bolts, thereby sealing the base. In some embodiments, an elastic member may be provided on the bolt, such as a spring may be sleeved on the bolt. When the first end face 921 is pressed tightly on the cover mounting opening, the spring sleeved on the bolt is compressed; when the cover needs to be removed, while loosening the bolt, the spring can push the first end face of the cover out of the mounting position, facilitating disassembly and assembly operations. In some embodiments, the side of the first end face 921 in contact with the cover mounting opening includes a sealing groove (not shown in the figure), which can be used to accommodate a sealing ring for sealing connection between the cover and the base.

[0072] In some embodiments, the second end face 922 can cooperate with the flow-through channel to form a seal, dividing the flow-through channel 913 into an upper flow-through channel 9131 and a lower flow-through channel 9132. When the base is disposed on the storage oil tank, the flow-through channel can be sealed to prevent oil and gas diffusion. In some embodiments, the circumference of the second end face 922 in contact with the flow-through channel includes a sealing groove (not shown in the figure), which can be used to accommodate a sealing ring for sealing isolation between the upper flow-through channel 9131 and the lower flow-through channel 9132.

[0073] In some embodiments, the connecting column 923 may further include an oil passage 9231 and an electrical passage 9232 arranged in parallel, which can be respectively connected to the oil pipe and the circuit pipe of the pump pipe. In some embodiments, the oil passage and the electrical passage penetrate the entire connecting column and extend outside the first end face, and the wire bridge 970 can be connected to the electrical passage. In some embodiments, one or more openings 9233 may be included on the side wall of the connecting column, which are located between the first end face and the second end face, and can communicate the oil passage 9231 with the upper flow passage 9131, so that the oil can enter the upper flow passage through the oil passage and the oil is output from the oil outlet. In some embodiments, at least part of the side wall of the connecting column between the first end face and the second end face may be hollowed out, which can enlarge the channel area for the oil to flow into the upper flow passage and reduce the flow resistance. In some embodiments, the connecting column 923 may further extend away from the first end face towards the second end face, and it can be connected to the pump pipe. In some embodiments, one end of the connecting column 923 extending outside the second end face may include a connecting portion, which can be used to connect to the pump pipe. In some embodiments, the connecting portion may include threads, which can be provided on the inner walls of the oil passage 9231 and the electrical passage 9232, and can be threadedly connected to the oil pipe and the circuit pipe respectively.

[0074] Combined Figure 13 and Figure 14 , Figure 13 FIG. is a schematic diagram of a valve assembly according to an embodiment of the present application. Figure 14 FIG. is a cross-sectional view of a valve assembly according to an embodiment of the present application.

[0075] In some embodiments, the valve assembly 930 can enter the oil passage of the cover body from the first end face of the cover body and be arranged in the oil passage of the cover body, and it can be used to allow or block the oil to pass through the oil passage 9231. In some embodiments, the valve assembly 930 includes: a valve cover 931, a valve seat 932, and a valve core 933. Among them, the valve cover is arranged at the first end face of the cover body, the valve seat 932 is arranged at the second end face of the cover body, and one end of the valve core 933 extends into the valve cover 931, and the other end abuts against the valve seat 932. In some embodiments, the valve cover 931 and the valve seat 932 are hermetically connected to the cover body. In some embodiments, when the gas station needs the submersible pump to draw oil from other storage tanks, the valve assembly 930 may further include a vacuum passage 934, which is connected between the valve cover 931 and the valve seat 932 and extends to the valve cover 931 and the valve seat 932, and can draw the oil in other storage tanks into the submersible pump.

[0076] In some embodiments, the valve cover 931 is an integral disk-shaped structure as a whole. It may include a cover plate 9311 and side plates 9312 extending outward from the cover plate. Among them, the outer surface of the side plate 9312 may include threads, which can be used for the connection between the valve cover and the cover body. In some embodiments, the valve cover 931 may further include a sealing groove 9313, which is provided at the connection between the cover plate 9311 and the side plate 9312 and can be used to seal the installation gap between the valve cover and the cover body. In some embodiments, the valve cover 931 may further include a valve core accommodating channel 9314, which extends outward in the direction of extension from the cover plate 9311 to the side plate and can be used to accommodate one end of the valve core. In some embodiments, the axis of the valve core accommodating channel 9314 coincides with the axis of the valve cover.

[0077] In some embodiments, at least a part of a vacuum channel 9341 is included on the valve cover 931, and its axis is parallel to the axis of the valve cover and can extend outward in the direction from the cover plate to the side plate. In some embodiments, an installation hole 9315 for docking with other parts of the vacuum channel may also be included in the vacuum channel 9341. The installation hole is a stepped hole. Among them, the aperture gradually becomes larger in the extending direction of the vacuum channel 9341, and a stepped surface is formed between different apertures. This stepped surface can be used for axial positioning when installing with other parts of the vacuum pipeline. In some embodiments, in the part with a larger diameter of the installation hole 9315, there are successively included: a sealing groove 9316 and a snap ring groove 9317. Among them, the sealing groove can be used to install a sealing ring to seal the installation between different parts of the vacuum channel, and the snap ring groove can be used to fix the connection between different parts of the vacuum channel.

[0078] In some embodiments, the valve cover 931 may further include protruding parts 9318 and 9319 extending outward from the cover plate, which are respectively arranged outside the valve core accommodating channel 9314 and the vacuum channel 9341 and extend in the direction opposite to the extension direction of the side plate. In some embodiments, the inner wall of the protruding part may include threads, which can be used to connect other structures. In some embodiments, the protruding parts 9318 and 9319 may be connected to each other, and their outer contour shapes are similar to the shape of "8", which can be used as the force application position of the tightening tool when installing the valve cover onto the cover body.

[0079] In some embodiments, the valve seat 932 is an integral circular ring structure. Among them, the diameter of one end of the valve seat 932 can be slightly smaller than that of the other end, so that a conical surface is formed on the outer side of the valve seat 932, which is convenient for guiding into the oil passage of the cover during the installation process. In some embodiments, the valve port 9321 where the valve seat 932 contacts the valve core is a stepped port, and the edge line position 9322 where the valve core contacts the stepped port is designed as a conical surface, which can be used for cooperation with the valve core. In some embodiments, the cone angle of the conical surface is 50° - 70°. In some embodiments, a partial vacuum passage 9342 is further provided on the valve seat 932. It extends from the side surface of the valve seat 932 and extends along the axial direction of the valve seat, inserts into the mounting hole 9315 of the valve cover, and can be connected to the vacuum tube passage 9341, thereby connecting the valve seat and the valve cover.

[0080] In some embodiments, the valve core 933 includes a retaining piece 9331 and a connecting rod 9332. Among them, the retaining piece 9331 can be close to or far from the valve port 9321 of the valve seat 932, so as to close or open the oil passage; the connecting rod 9332 is arranged on the retaining piece and extends outward from the retaining piece, can extend into the valve core receiving channel 9314 of the valve cover, and can move in the valve core receiving channel. In some embodiments, the valve core 933 may further include a gasket 9333, which can be arranged on the retaining piece and face the valve seat. When the retaining piece is close to the valve port 9321, the gasket can be pressed tightly on the valve port to completely close the oil passage and prevent oil from passing through. In some embodiments, the retaining piece 9331 may include a positioning protrusion 9334, which can be used to sleeved the gasket 9333 and position the gasket.

[0081] In some embodiments, the valve core may further include an elastic reset member 9335, which can be used for resetting the retaining piece during the movement process. In some embodiments, the elastic reset member 9335 can be a spring, which is sleeved on the connecting rod 9332, with one end abutted against the retaining piece 9331 and the other end abutted against the end of the valve core receiving channel. When the oil pressure pushes the retaining piece away from the valve port, the spring is compressed; when there is no oil pressure, the spring will push the retaining piece close to the valve port.

[0082] In some embodiments, the valve core may further include a flow guiding cone 9336, which is disposed on the side of the baffle away from the connecting rod. When the valve core is pushed open by the oil fluid, the oil fluid channel between its outer surface and the valve seat will generate a vacuum due to the Venturi effect, thereby functioning as a siphon valve. In some embodiments, the outer surface of the flow guiding cone is a conical surface, and the range of the cone apex angle may be 50° - 70°. In some embodiments, the flow guiding cone 9336 may include a through hole penetrating along the axis of the connecting rod. The through hole may be a stepped hole, which can be used for the installation of the flow guiding cone on the baffle. For example, the through hole can be installed on the positioning protrusion 9334 and fixed on the positioning protrusion by a snap ring, so as to install the flow guiding cone on the baffle. In some embodiments, when the flow guiding cone is installed on the positioning protrusion, it can also cooperate with the baffle to clamp the gasket, preventing the gasket from moving under the immersion of the oil fluid and affecting the control of the oil fluid channel.

[0083] In some embodiments, when the pressure in the pipeline connecting the gas station and the submersible pump exceeds the expected value due to reasons such as water hammer effect or the operation of parallel submersible pumps, the submersible pump needs to adjust the pressure in the pipeline to prevent damage to the valve assembly. The valve assembly may further include a pressure regulating valve rod 935, which may be disposed in the valve core 933. In some embodiments, the valve core 933 may include an installation hole 9337, which penetrates through the connecting rod and the baffle along the axis of the connecting rod. The pressure regulating valve rod 935 is disposed in the installation hole 9337 and can move along the installation hole, thereby controlling the on-off of the installation hole and adjusting the pressure on both sides of the valve core.

[0084] In some embodiments, the pressure regulating valve rod 935 may include a through rod 9351, a return spring 9352, and a stop head 9353. Among them, one end of the through rod 9351 includes a protruding conical surface, which penetrates into the installation hole 9337 from one end of the baffle. The protruding conical surface can be pressed against the baffle, and the other end of the through rod can penetrate out of the installation hole; the return spring 9352 is sleeved on the through rod, and the stop head is disposed at the end of the through rod 9351 that penetrates out of the installation hole. One end of the return spring abuts against the end of the connecting rod, and the other end abuts against the stop head. In some embodiments, a sealing ring 9354 is included at the contact between the conical surface of the through rod and the baffle, which can be used for the seal between the pressure regulating valve rod and the valve core. When the conical surface of the through rod moves away from the baffle, the installation hole of the valve core opens, and both sides of the valve core are connected, and the pressures on both sides can communicate with each other, and the return spring is compressed by the force; when the pressures on both sides are the same, the return spring pushes the conical surface of the through rod closer to the baffle, and the installation hole of the valve core closes.

[0085] In some embodiments, the stop 9353 is threadedly connected to the through rod. Or rather, the connecting end of the through rod and the stop, as well as the inner wall of the stop, include threads, so that the position of the stop on the through rod can be adjusted, the compression amount of the return spring can be adjusted, and thus the set pressure of the pressure regulating valve rod can be adjusted. When the pressure in the pipeline exceeds the set pressure, the oil pressure will push open the through rod to relieve pressure into the storage oil tank.

[0086] In some embodiments, the valve assembly 930 may further include a check valve 936, which can be disposed in the vacuum passage to enable only one-way flow of the vacuum passage and prevent the oil from flowing out of the submersible pump through the vacuum tube passage. In some embodiments, the check valve 936 includes a valve body 9361 and a core 9362. Among them, the valve body 9361 is disposed on the protruding portion 9319 of the valve cover, and the core 9362 can move within the valve body. In some embodiments, the check valve 936 may further include a plug 9363, which can be disposed on the valve body to seal the vacuum passage. When the vacuum passage is needed, the plug can be removed.

[0087] In some embodiments, the valve assembly 930 may further include a lifting ring 937, which can be disposed on the valve cover and can serve as a lifting point during the installation and maintenance of the entire pump. In some embodiments, the lifting ring 937 can be connected to the valve cover through a lifting ring head. Among them, the first end of the lifting ring head includes a threaded blind hole for connecting the lifting ring; the second end of the lifting ring head includes an external thread for connecting to the protruding portion 9318 of the valve cover. In some embodiments, the second end of the lifting ring head may further include a blind hole, which can communicate with the valve core receiving channel 9314 to accommodate part of the valve core, thereby reducing the height of the valve cover, facilitating reducing the volume of the valve cover and lowering the cost.

[0088] The valve assembly of the present application can be used as a complete module and is installed on the cover body of the pump head through the valve cover. A seal can be formed between the outer side of the valve cover and the cover body through a sealing ring, and at the same time, a seal can be formed between the outer side of the valve seat and the cover body through a sealing ring. When the submersible pump starts, the oil is pressurized from the submersible motor and enters the oil passage of the pump head cover body through the pump pipe. The oil can push open the valve core in the oil passage, enter the upper flow passage of the pump head base, and can be transported to the pipeline outside the submersible pump through the oil outlet connected to the upper flow passage; thus, the oil flow direction is in an "L" shape, which can simplify the flow passage of the oil flow and is beneficial to the flow of the oil. After refueling, the valve core falls back to the closed position under the dual action of the elastic reset member and the pipeline oil pressure, preventing the oil stored in the pipeline from returning to the oil tank. Among them, when the pressure in the oil station pipeline exceeds the expected value due to reasons such as water hammer effect or the operation of parallel submersible pumps, the pressure regulating valve rod in the valve core will be pushed open under the action of the oil pressure, and part of the liquid will be discharged back into the pump pipe for pressure relief. When the pressure relief reaches the expected value, the pressure regulating valve rod resets under the action of the return spring, and the sealing ring at the bottom of the pressure regulating valve rod seals the installation hole in the valve core.

[0089] During the process of the submersible pump refueling outward, a Venturi effect is generated at the position of the flow guiding cone of the valve core and the valve port of the valve seat, resulting in a local reduction in liquid pressure and the generation of a vacuum degree. When the oil station needs the submersible pump to use the siphon effect generated by the vacuum to extract oil from other storage tanks, the plug of the vacuum channel check valve can be removed, and the oil extraction pipeline can be connected. When the oil flows through the flow guiding cone of the valve core, the created vacuum can be used to pump the external liquid into the pump head together. When the external liquid is pumped into the pump head together, the fuel dispenser does not refuel externally. The pump head may further include a return oil valve core 960. It is arranged on the second end face of the valve cover and can control the return of the external liquid to the storage tank. In some embodiments, the second end face may include a return channel 9221, which can be used to accommodate the return oil valve core, and the return oil valve core can control its on-off.

[0090] Reference Figure 11D , in some embodiments, the return oil valve core 960 includes a return oil valve rod 961, a snap ring 962, and a spring 963. Among them, the first end of the return oil valve rod 961 is arranged on the side of the second end face of the cover body away from the first end face, and the second end of the return oil valve rod 961 passes through the second end face and extends towards the first end face; the snap ring 962 is arranged on the second end of the return oil valve rod; the spring 963 is sleeved on the return oil valve rod, with one end abutting against the snap ring and the other end abutting against the second end face. In some embodiments, the first end of the return oil valve rod 961 may include a sealing ring, and the first end of the return oil valve rod can be pressed against or away from the second end face. When the submersible pump needs to suck liquid from other containers into the storage tank, the corresponding fuel gun of the submersible pump can be lifted from the fuel dispenser but not refueled, triggering the submersible pump start signal, and keeping the submersible pump motor running but not supplying oil externally. At this time, the oil pressure in the submersible pump is at the highest point of its performance curve, and the first end of the return oil valve rod will be pushed away from the second end face by the oil pressure, opening the return oil channel 9221, and releasing the oil into the storage tank through the riser pipe of the storage tank connected to the pump head base, forming an internal circulation state, and the spring is in a compressed state under force; when the suction of the liquid ends, the first end of the return oil valve rod can be pressed against the second end face under the action of the spring, closing the return oil channel. In some embodiments, the opening pressure of the return oil valve core is higher than that of the pressure regulating valve rod.

[0091] In some embodiments, the first end of the return oil valve rod 961 may include a protruding boss 9611, which facilitates the return oil valve rod to be pressed against the second end face. In some embodiments, the diameters of the first end and the second end of the return oil valve rod 961 are larger than the diameter of the middle part. In other words, part of the material is removed from the middle part of the return oil valve rod, which can ensure that the return oil valve rod is centered in the return oil channel, facilitating sealing in the closed state and guiding during movement; it is also beneficial to increase the cross-sectional area of the oil return when in the oil return state and accelerate the return speed.

[0092] The submersible pump of the present application sets the circuit pipe outside the oil pipe, without occupying the flow area inside the oil pipe, with small oil flow resistance, which is beneficial to improving efficiency and reducing energy consumption; it can also simplify the pump pipe assembly, facilitating the inspection and replacement of the circuit pipe and its internal cable; when the overall pump length needs to change, the telescopic pump pipe is easy to operate and saves manpower; moreover, the pump head adapts to the setting method of the oil pipe and the circuit pipe, enabling the flow channel shape inside the pump head to be simple, with a large flow area and small flow loss; the axis of the valve assembly also coincides with the axis of the oil pipe, and it can be directly sealed in the oil outlet direction of the oil pipe, allowing the oil in the pump pipe to pass through the valve assembly without excessive turning, with low flow resistance and good sealing effect; furthermore, the liquid flow channel and the electrical channel inside the pump head are separated and arranged without interference with each other, with a simple structure, a compact shape, and a small weight; most of the functions required under special working conditions of the submersible pump can also be integrated and implemented in the valve assembly, making assembly and maintenance very simple; in addition, the pump head arranges structures such as the wiring cavity and the capacitor cavity on the pump head base, which can reduce the labor intensity of the lifting work when the extractable part of the submersible pump needs to be taken out from the storage tank.

[0093] The present application also proposes another structure of the submersible pump. Among them, the pump pipe assembly part is similar to Figure 1 the embodiment, so only the structure of the pump head part will be described here. Specifically as follows:

[0094] Figure 15 FIG. is a schematic diagram of the pump head structure according to another embodiment of the present application. Figure 16 FIG. is a top view of the pump head according to another embodiment of the present application. Figures 17A - 17E FIG. is a cross-sectional view of the pump head according to another embodiment of the present application. Figure 18 FIG. is an exploded view of the pump head according to another embodiment of the present application.

[0095] As shown in the figure, the pump head 1500 includes a base 1510, a cover 1520, a valve assembly 1530, a capacitor 1540, and a junction box 1550. Among them, the cover 1520 is arranged on the base 1510 and can seal the base 1510; the valve assembly 1530 can be arranged on the cover and can be used to control the oil passing through the pump head, the capacitor 1540 can be arranged on the base, the junction box 1550 is connected to the capacitor 1540 and can be arranged on the base, and can be used to connect the pump head to an external power supply. In some embodiments, the pump head 1500 may further include a wire bridge 1570, which is connected between the capacitor 1540 and the cover 1520 and can be used to connect and isolate the capacitor cavity and the circuit pipe, so that the submersible pump meets the requirements of explosion-proof design, separating the capacitor cavity and the threading pipe into two independent cavities.

[0096] In some embodiments, the base 1510 is generally cylindrical as a whole, and it includes: a riser installation opening 1511, a cover installation opening 1512, a flow-through channel 1513, a capacitor cavity 1514, and a wiring cavity 1515. Among them, the riser installation opening 1511 is used to connect the base to the riser of the oil storage tank; the cover installation opening 1512 is used to connect to the cover 1520; the flow-through channel 1513 is arranged between the riser installation opening 1511 and the cover installation opening 1512 and is communicated with the riser installation opening 1511 and the cover installation opening 1512; the capacitor cavity 1514 and the wiring cavity 1515 are arranged on one side of the base and are parallel to the axis of the flow-through channel 1513.

[0097] In some embodiments, the riser installation opening 1511 may include threads, and the base can be connected to the top riser of the oil storage tank through threaded connection. In some embodiments, the cover installation opening 1512 includes a limiting groove, which is used for positioning when the cover 1520 is connected to the base.

[0098] In some embodiments, the capacitor cavity is a cavity with an opening at one end, and the wiring cavity is a cavity with openings at both ends. In some embodiments, the capacitor cavity and the wiring cavity are adjacent to each other, and a wire passing hole is provided therebetween, which can be used for circuit connection. In some embodiments, the base 1510 may further include a wiring cavity cover 1516, which can be arranged at one end of the wiring cavity. The power cord at the gas station site can enter from the open end of the wiring cavity and complete wiring with the capacitor and the junction box in the wiring cavity. In some embodiments, the base 1510 may further include a capacitor cavity cover (not shown in the figure), which can be used to close the capacitor cavity.

[0099] In some embodiments, the base 1510 may further include a plurality of oil outlets 1517, which are arranged on the side wall of the base and are communicated with the flow-through channel 1513, and can be used to connect to the pipeline of the fuel dispenser to output the oil liquid. In some embodiments, the direction of the outlet can be perpendicular to the axis direction of the flow-through channel. In some embodiments, the plurality of oil outlets 1517 may be arranged at intervals in the circumferential direction of the base. In some embodiments, the part where the oil outlet is connected to the flow-through channel makes full use of the projection area on the oil outlet side of the pump head base, and the lateral part adopts an area close to a rectangle and gradually transitions to the oil outlet. In this way, the oil flow area can be fully expanded, the flow resistance can be reduced, and the space size of the pump head base can be reduced, making its shape compact. In some embodiments, the direction of the oil outlet is parallel to the axis direction of the flow-through channel, and during the transition of the oil outlet, the oil flow direction turns from radial to axial, which is beneficial to increasing the diameter of the oil outlet.

[0100] In some embodiments, the cover 1520 includes a first end face 1521, a second end face 1522, and a connecting column 1523. Among them, the first end face 1521 is disposed on the cover mounting opening 1512 of the base 1510 and can seal the base; the second end face 1522 extends into the base and is located in the flow-through channel 1513 of the base; the connecting column 1523 is connected between the first end face 1521 and the second end face 1522.

[0101] In some embodiments, the shape of the first end face 1521 is the same as that of the cover mounting opening on the base and is located in the cover mounting opening. Bolts can be used to press the first end face against the cover mounting opening, thereby sealing the base. In some embodiments, the bolts can be connected to the cover through the side wall of the base. For example, the bolts are directly connected to the second end face of the cover through the side wall of the base, which can further reduce the outer dimension of the pump head and optimize the volume of the pump head.

[0102] In some embodiments, the second end face 1522 can cooperate with the flow-through channel to form a seal, dividing the flow-through channel 1513 into an upper flow-through channel 15131 and a lower flow-through channel 15132. When the base is disposed on the oil storage tank, the flow-through channel can be sealed to prevent the diffusion of oil and gas. In some embodiments, the circumference of the contact between the second end face 1522 and the flow-through channel includes a sealing groove (not shown in the figure), which can be used to accommodate the sealing ring to seal and isolate the upper flow-through channel 15131 and the lower flow-through channel 15132.

[0103] In some embodiments, the connecting post 1523 may further include an oil passage 15231 and an electrical passage 15232 arranged in parallel, which can be respectively connected to the oil pipe and the circuit pipe of the pump pipe. In some embodiments, the connecting post 1523 may further extend away from the first end face towards the second end face, and it can be connected to the pump pipe, so that the oil passage 15231 and the electrical passage 15232 can be respectively connected to the oil pipe and the circuit pipe. In some embodiments, one end of the connecting post 1523 extending outside the second end face may include a connecting portion, which can be used to connect to the pump pipe. In some embodiments, the connecting portion may include threads, which can be provided on the inner walls of the oil passage 15231 and the electrical passage 15232, and can be threadedly connected to the oil pipe and the circuit pipe respectively. In some embodiments, the oil passage and the electrical passage penetrate through the entire connecting post and extend outside the first end face, and the wire passing bridge 1570 can be connected to the electrical passage. In some embodiments, one or more openings 15233 may be included on the side wall of the connecting post, which are located between the first end face and the second end face, and can communicate the oil passage 15231 with the upper flow passage 15131, so that the oil can enter the upper flow passage through the oil passage and the oil can be output from the oil outlet. In some embodiments, at least part of the side wall of the connecting post between the first end face and the second end face may be hollowed out, which can enlarge the channel area for the oil to flow into the upper flow passage and reduce the flow resistance.

[0104] Combined Figure 19 and Figure 20 , Figure 19 FIG. is a schematic diagram of a valve assembly according to another embodiment of the present application. Figure 20 FIG. is a cross-sectional view of a valve assembly according to another embodiment of the present application.

[0105] In some embodiments, the valve assembly 1530 can enter the oil passage of the cover body from the first end face of the cover body and be arranged in the oil passage of the cover body, which can be used to allow or block the oil to pass through the oil passage 15231. In some embodiments, the valve assembly 1530 includes: a valve cover 1531 and a valve core 1533. Among them, the valve cover is arranged at the first end face of the cover body, one end of the valve core 1533 extends into the valve cover 1531, and the other end abuts against the second end face of the cover body. In some embodiments, the valve cover 1531 is hermetically connected to the cover body. In some embodiments, the valve assembly 1530 may further include a valve seat (not shown in the figure), which can be arranged at the second end face of the cover body and is hermetically connected to the cover body, and the valve core can abut against the valve seat.

[0106] In some embodiments, the valve cover 1531 is generally a disc-shaped structure as a whole. It may include a cover plate 15311 and side plates 15312 extending outward from the cover plate. Among them, the outer surface of the side plates 15312 may include threads, which can be used for the connection between the valve cover and the cover body. In some embodiments, the valve cover 1531 may further include a sealing groove 15313, which may be provided at the connection between the cover plate 15311 and the side plates 15312 and can be used to seal the installation gap between the valve cover and the cover body. In some embodiments, the valve cover 1531 may further include a valve core accommodating channel 15314, which extends outward in the extending direction of the cover plate 15311 toward the side plates and can be used to accommodate one end of the valve core. In some embodiments, the axis of the valve core accommodating channel 15314 coincides with the axis of the valve cover.

[0107] In some embodiments, the valve cover 1531 may further include a protruding portion 15318 extending outward from the cover plate, which is provided outside the valve core accommodating channel 15314 and extends in a direction opposite to the extending direction of the side plates. In some embodiments, the inner wall of the protruding portion may include threads, which can be used to connect other structures. In some embodiments, the outer surface of the protruding portion may be similar to a hexagon and can be used as the force application position of the tightening tool when the valve cover is installed on the cover body.

[0108] In some embodiments, the valve core 1533 includes a retaining piece 15331 and a connecting rod 15332. Among them, the retaining piece 15331 can be close to or far from the second end face of the cover body, so as to close or open the oil passage; the connecting rod 15332 is arranged on the retaining piece and extends outward from the retaining piece, can extend into the valve core accommodating channel 15314 of the valve cover, and can move in the valve core accommodating channel. In some embodiments, the valve core 1533 may further include a sealing gasket 15333, which can be arranged on the retaining piece and face the second end face. When the retaining piece is close to the second end face, the sealing gasket can be pressed tightly on the second end face to completely seal the oil passage and prevent oil from passing through. In some embodiments, the retaining piece 15331 may include a positioning protrusion 15334, which can be used to sleeved the sealing gasket 15333 and position the sealing gasket.

[0109] In some embodiments, the valve core may further include an elastic resetting member 15335, which can be used for the resetting of the retaining piece during movement. In some embodiments, the elastic resetting member 15335 may be a spring, which is sleeved on the connecting rod 15332, with one end abutted against the retaining piece 15331 and the other end abutted against the end of the valve core accommodating channel. When the oil pressure pushes the retaining piece away from the valve port, the spring is compressed by force; when there is no oil pressure, the spring will push the retaining piece close to the valve port.

[0110] In some embodiments, the valve core may further include a guide 15336, which is disposed on the side of the baffle away from the connecting rod and can be used to guide the movement of the valve core. In some embodiments, the guide 15336 may include a through hole penetrating along the axis of the connecting rod, which can be used for the installation of the guide on the baffle. For example, the through hole can be installed on the positioning protrusion 15334 and fixed by a snap ring, so that the guide can be installed on the baffle. In some embodiments, when the guide is installed on the positioning protrusion, it can also cooperate with the baffle to clamp the gasket, preventing the gasket from moving under the immersion of the oil, which affects the control of the oil passage. In some embodiments, the guide may include a plurality of guide posts, which are spaced in the circumferential direction of the guide and extend into the oil passage, effectively preventing the valve core from deviating during movement and affecting the control of the oil passage.

[0111] In some embodiments, when the pressure in the pipeline connecting the gas station and the submersible pump exceeds the expected value due to reasons such as water hammer effect or the operation of parallel submersible pumps, the submersible pump needs to adjust the pressure in the pipeline to prevent damage to the valve assembly. The valve assembly may further include a pressure regulating valve rod 1535, which may be disposed in the valve core 1533. In some embodiments, the valve core 1533 may include an installation hole 15337, which penetrates the connecting rod and the baffle along the axis of the connecting rod. The pressure regulating valve rod 1535 is disposed in the installation hole 15337 and can move along the installation hole, thereby controlling the on-off of the installation hole and adjusting the pressure on both sides of the valve core.

[0112] In some embodiments, the pressure regulating valve rod 1535 may include a through rod 15351, a return spring 15352, and a stop head 15353. Among them, one end of the through rod 15351 includes a protruding conical surface, which penetrates into the installation hole 15337 from one end of the baffle. The protruding conical surface can be pressed against the baffle, and the other end of the through rod can penetrate out of the installation hole; the return spring 15352 is sleeved on the through rod, and the stop head is disposed at the end of the through rod 15351 that penetrates out of the installation hole. One end of the return spring abuts against the end of the connecting rod, and the other end abuts against the stop head. In some embodiments, a sealing ring 15354 is included at the contact between the conical surface of the through rod and the baffle, which can be used for sealing between the pressure regulating valve rod and the valve core. When the conical surface of the through rod is away from the baffle, the installation hole of the valve core is opened, and both sides of the valve core are connected, and the pressures on both sides can communicate with each other, and the return spring is compressed by force; when the pressures on both sides are the same, the return spring pushes the conical surface of the through rod close to the baffle, and the installation hole of the valve core is closed.

[0113] In some embodiments, the stop head 15353 is threadedly connected to the through rod. Or rather, the through rod, the connecting end of the through rod and the stop head, and the inner wall of the stop head include threads, so that the position of the stop head on the through rod can be adjusted, the compression amount of the return spring can be adjusted, and thus the set pressure of the pressure regulating valve rod can be adjusted. When the pressure in the pipeline exceeds the set pressure, the oil pressure will push open the through rod to release pressure into the storage oil tank.

[0114] In some embodiments, the valve assembly 1530 may further include a lifting ring 1537, which can be arranged on the valve cover and can be used as a lifting point during the installation and maintenance of the whole pump. In some embodiments, the lifting ring 1537 can be connected to the protruding part 15318 of the valve cover. In some embodiments, the lifting ring can be integrally formed with the protruding part.

[0115] The valve assembly of the present application can be used as a complete module and is installed on the cover body of the pump head through the valve cover. A seal can be formed between the outer side of the valve cover and the cover body through a sealing ring. When the submersible oil pump is started, the oil liquid is pressurized from the submersible motor and enters the oil liquid channel of the pump head cover body through the pump pipe. In the oil liquid channel, the valve core can be pushed open and enter the upper flow channel of the pump head base, and can be transported to the pipeline outside the submersible oil pump through the oil outlet connected to the upper flow channel; thus, the flow direction of the oil liquid is in an "L" shape, which can simplify the flow channel of the oil liquid and is beneficial to the flow of the oil liquid. After refueling, the valve core falls back to the closed position under the dual action of the elastic return member and the pipeline oil pressure, preventing the stored oil in the pipeline from returning to the oil tank. Among them, when the pressure in the oil station pipeline exceeds the expected value due to reasons such as water hammer effect or the operation of parallel submersible oil pumps, the pressure regulating valve rod in the valve core will be pushed open under the action of the oil pressure, and a part of the liquid will be released back into the pump pipe for pressure relief. When the pressure relief reaches the expected value, the pressure regulating valve rod will reset under the action of the return spring, and the sealing ring at the bottom of the pressure regulating valve rod will seal the installation hole in the valve core.

[0116] When the gas station needs the submersible oil pump to draw oil liquid from other storage oil tanks, the pump head may further include a siphon valve 1560. It is arranged on the base and can control the external oil liquid to flow back into the storage oil tank. Refer to Figure 17B , in some embodiments, the base may include a return channel 1518, which is communicated with the outside of the pump head, the upper flow channel 15131 and the lower flow channel 15132, and can be used to accommodate the siphon valve 1560, and the siphon valve can also control the on-off of the oil return channel 1518. In some embodiments, when the submersible oil pump does not need to draw oil liquid from other storage oil tanks, the siphon valve can be replaced with a plug bolt, which can block the return channel and can seal and isolate the outside of the pump head, the upper flow channel 15131 and the lower flow channel 15132 from each other.

[0117] Combined with Figure 21 、 Figure 22A 、 Figure 22B AndFigure 23 。 Figure 21 Schematic diagram of a siphon valve structure according to another embodiment of the present application. Figure 22A and Figure 22B Cross-sectional view of a siphon valve structure according to another embodiment of the present application. Figure 23 Exploded view of a siphon valve structure according to another embodiment of the present application. In some embodiments, the siphon valve 1560 may include a valve body 1561, a valve cover 1562, a valve core 1563, a manifold 1564, a first check valve 1565, and a second check valve 1566.

[0118] In some embodiments, the valve body 1561 is generally cylindrical in shape, and its interior includes a valve core cavity 15611, which can be used to accommodate the valve core 1563. Among them, the valve core cavity 15611 penetrates the first end of the valve body, and the valve core 1563 can be placed in the valve core cavity from the first end of the valve body. In some embodiments, the valve cover 1562 is disposed on the first end of the valve body and can close the valve core cavity. In some embodiments, the valve body 1561 further includes a first flow channel 15612, which communicates with the lower end of the valve core cavity 15611 and the second end of the valve body, and can communicate the valve core cavity with the lower flow channel 15132. In some embodiments, the first flow channel 15612 is a diffuser flow channel, that is, the diameter of the first flow channel gradually increases from the valve core cavity to the second end of the valve body. In some embodiments, the valve body 1561 further includes one or more second flow channels 15613, which are arranged in the circumferential direction of the valve body and communicate with the upper end of the valve core cavity, and can communicate the valve core cavity with the upper flow channel 15131. In some embodiments, the valve body 1561 further includes an oil inlet 15614, whose direction is perpendicular to the axis of the valve body and is disposed at the intersection of the valve core cavity and the first flow channel.

[0119] In some embodiments, the first check valve 1565 is disposed at the outlet of the first flow channel, or at the second end of the valve body, to prevent the oil from flowing back. In some embodiments, when the submersible pump starts the siphon function, it is necessary to close the outlet of the submersible pump and operate at the highest pressure. The opening pressure of the first check valve is slightly lower than the highest pressure. In some embodiments, the first check valve 1565 can also fix the valve body in the return channel 1518.

[0120] In some embodiments, the valve core 1563 is disposed in the valve core cavity of the valve body and is at a certain distance H from the first flow channel. In some embodiments, the distance H may be 1.3 - 3.8 mm. In some embodiments, the valve core 1563 may include a third flow channel 15631, whose axis coincides with the axis of the valve core and runs through the entire valve core. In some embodiments, the diameter of the third flow channel is smaller than that of the first flow channel. When the oil fluid enters the first flow channel through the third flow channel, due to the change in the flow channel diameter, a vacuum will be generated, thereby enabling suction from the inlet port. In some embodiments, one end of the valve core close to the first flow channel may be a conical surface, which can further generate a vacuum.

[0121] In some embodiments, the manifold 1564 may be sleeved on the inlet port of the valve body 1561 and is used to connect other pipelines. In some embodiments, the manifold 1564 may also surround the circumferential space of the valve body and can rotate in the circumferential direction of the valve body 1561, facilitating connection with other pipelines. In some embodiments, the second check valve 1566 is disposed on the manifold to prevent the oil fluid from flowing back into other pipelines. In some embodiments, the opening pressure of the second check valve is less than that of the first check valve.

[0122] When the submersible oil pump normally outputs oil fluid, the pipeline pressure connected to the submersible oil pump is usually around 0.2 MPa. At this time, the first check valve remains closed and the siphon valve does not work; when it is necessary to start the siphon valve, the submersible oil pump starts but does not supply oil externally, keeping all the outlet valve, oil gun, etc. in a closed state. At this time, the submersible oil pump operates in a state close to zero flow rate, and the pressure inside the submersible oil pump is the designed maximum pressure, approaching 0.3 MPa. Under this pressure, the first check valve of the siphon valve will be opened, and the oil fluid inside the submersible oil pump enters the second flow channel of the valve body through the upper flow channel, enters the third flow channel of the valve core from the second flow channel, and enters the first flow channel of the valve body through the third flow channel of the valve core. This process generates a vacuum between the valve core and the first flow channel, and then enters the oil return channel of the pump head through the first check valve, and returns to the storage tank through the lower flow channel from the oil return channel, completing the internal circulation of the submersible oil pump. During the internal circulation process, due to the limitation of the first check valve, the flow rate through the siphon valve is very small, and the submersible oil pump can still operate in a state close to zero flow rate, maintaining the pressure inside the submersible oil pump high enough to push open the first check valve. At this time, by connecting the second check valve installed on the manifold to the vacuum pipeline, liquid can be extracted from other containers through the vacuum pipeline.

[0123] As described above, this is only the specific implementation manner of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application.

Claims

1. A pump head for a submersible pump, comprising: A base, comprising a riser installation opening, a cover installation opening, a flow passage, a capacitor cavity and a wiring cavity, wherein the riser installation opening is connected to the oil storage tank, the cover installation opening is opposite to the riser installation opening, and the flow passage is connected to the riser installation opening and the cover installation opening; A cover body, comprising a first end face, a second end face and a connecting column, wherein the first end face is arranged on the cover body mounting opening of the base to close the base, and the second end face extends into the base and divides the flow passage into an upper flow passage and a lower flow passage, wherein the lower flow passage is communicated with the oil storage tank; the connecting column is connected between the first end face and the second end face, and the connecting column comprises an oil passage and an electrical passage arranged in parallel, wherein the oil passage and the electrical passage pass through the first end face and the second end face, wherein the oil passage is communicated with the upper flow passage; A valve assembly, which is disposed in the oil passage of the cover body by the first end surface of the cover body, and is used to control the passage of oil; A capacitor disposed in the capacitor cavity of the base; as well as A junction box, which is arranged in the junction cavity of the base and connected to the capacitor; Wherein, the valve assembly includes a one-way valve and a pressure relief valve, the one-way valve is used to control the passage of oil; the pressure relief valve is arranged in the one-way valve, and is used to control and adjust the pressure that impacts the one-way valve.

2. According to the pump head for a submersible pump according to claim 1, the connecting column extends into the lower flow channel and is connected to the pump pipe.

3. According to the pump head for a submersible oil pump as described in claim 1, at least a portion of the connecting column between the first end face and the second end face is hollowed out to increase the flow area between the oil channel and the upper flow channel.

4. According to the pump head for a submersible oil pump as described in claim 1, the base includes one or more oil outlets, and the oil outlets are arranged on the side walls of the base and are connected to the upper flow channel.

5. The pump head for a submersible pump according to claim 1, wherein the valve assembly comprises: A valve cover, a valve seat and a valve core, wherein the valve cover is arranged on the first end surface of the cover body, the valve seat is arranged on the second end surface of the cover body, the first end of the valve core extends into the valve cover, and the second end abuts against or is away from the valve seat. When the valve core is in the first position, the valve core abuts against the valve seat, and when the valve core is in the second position, the valve core is away from the valve seat.

6. The pump head for a submersible pump according to claim 5, wherein the valve core comprises an axially penetrating mounting hole.

7. According to the pump head for a submersible pump as described in claim 6, the valve assembly includes a pressure regulating valve stem, which is arranged in the mounting hole and can move axially along the mounting hole.

8. According to the pump head for a submersible pump as described in claim 5, the valve assembly may also include a vacuum channel, which is connected between the valve cover and the base and communicates with the outside of the pump head and the first position of the valve core.

9. According to the pump head for a submersible pump as described in claim 8, the valve core includes a guide cone, which includes a conical surface extending along the base and gradually shrinking, and the cone top angle of the conical surface is 50°-70°.

10. A submersible pump, comprising the pump head for a submersible pump according to any one of claims 1 to 9.

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