Oil-submerged pump for gas station

Abstract

The utility model relates to an oil-submerged pump for a gas station. The oil-submerged pump comprises a pump head, a pump pipe and an oil-submerged motor, the submersible motor is arranged in the oil storage tank and is used for extracting oil in the oil storage tank; the pump pipe is connected between the pump head and the submersible motor and comprises an oil way pipe and a circuit pipe, the oil way pipe is used for allowing oil to pass through and leave an oil storage tank, and the circuit pipe is used for allowing an electric wire to pass through and supplying power to the submersible motor; the pump head is arranged above an opening of the oil storage tank and used for allowing oil and electric wires to pass through. Wherein the circuit pipe is arranged outside the oil way pipe, and the circuit pipe and the oil way pipe are arranged in parallel. The oil-submerged pump is simple in structure, small in size and weight and small in pressure loss of oil flowing, and later maintenance of the pump pipe is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil filling equipment field especially relates to a submersible pump for gas station. BACKGROUND

[0002] In the fuel delivery system of the gas station, the submersible pump as the core power equipment is usually installed on the top vertical pipe structure of the oil storage tank through the flange. Generally, the oil storage tank is buried in the ground of the gas station, and a manhole is arranged at the top vertical pipe structure. The installation and maintenance of the submersible pump and other daily operations requiring manual operation are all completed by the construction personnel in the manhole. The submersible pump is composed of a pump head, a pump pipe and a submersible motor. When the submersible pump is installed on the oil storage tank, the pump head part is exposed in the manhole, the pump pipe extends into the oil storage tank, and the submersible motor is immersed in the oil. When refueling is needed, the refueling gun is lifted to control the relay to receive signals and drive the corresponding submersible pump to work, realizing the delivery of fuel from the oil storage tank to the refueling machine.

[0003] However, the pump pipe of the current submersible pump is usually a set of coaxial pipes. The inside is a threading pipe to supply power to the submersible motor, and the outside is an oil pipe to supply oil externally. The pump head is also provided with a coaxial installation interface corresponding to the pump pipe to connect the oil circuit and the circuit. At the same time, the pump head also needs to have a power supply introduction structure, such as a junction box, a capacitor cavity, an explosion-proof connecting device, etc.; and related functions of fluid control, such as one-way valve, siphon valve, etc. modules. Therefore, the structure of the submersible pump is complex, the volume and weight are large, the pressure loss of oil flow is large, and the maintenance difficulty and cost of the pump pipe are high. SUMMARY

[0004] In view of the technical problems existing in the prior art, the utility model provides a submersible pump for gas station, which comprises: a pump head, a pump pipe and a submersible motor; the submersible motor is arranged in the oil storage tank and is used for pumping oil in the oil storage tank; the pump pipe is connected between the pump head and the submersible motor, which comprises an oil circuit pipe and a circuit pipe, the oil circuit pipe is used for containing oil to leave the oil storage tank, and the circuit pipe is used for containing wires to pass through and supply power to the submersible motor; the pump head is arranged above the opening of the oil storage tank and is used for containing oil and wires to pass through; wherein the circuit pipe is arranged outside the oil circuit pipe and is arranged in parallel with the oil circuit pipe.

[0005] The submersible pump for gas station as described above, the oil circuit pipe and the circuit pipe are both telescopic pipes, which are used for adjusting the position of the submersible motor arranged in the oil storage tank.

[0006] The submersible pump for gas station as claimed in claim 1, wherein the oil pipe comprises a first oil pipe and a second oil pipe, one end of the first oil pipe is arranged in the second oil pipe and is axially extendable along the second oil pipe; and the circuit pipe comprises a first circuit pipe and a second circuit pipe, one end of the first circuit pipe is arranged in the second circuit pipe and is axially extendable along the second circuit pipe.

[0007] The submersible pump for gas station as claimed in claim 1, further comprising an adjusting device arranged on the oil pipe and / or the circuit pipe and used for locking the length of the oil pipe and / or the circuit pipe.

[0008] The submersible pump for gas station as claimed in claim 1, wherein the adjusting device comprises a first holding member, a second holding member and a connecting member, the first holding member is arranged at the end of the second oil pipe accommodating the first oil pipe, the second holding member is arranged on the first oil pipe, the connecting member is connected between the first holding member and the second holding member and used for fixing the distance between the first holding member and the second holding member; when the second holding member is in a locking state, the first oil pipe and the second oil pipe are locked, when the second holding member is in a non-locking state, the first oil pipe is axially extendable along the second oil pipe.

[0009] The submersible pump for gas station as claimed in claim 1, wherein the first holding member and / or the second holding member at least partially extends outward to form a circuit pipe accommodating portion accommodating the second circuit pipe.

[0010] The submersible pump for gas station as claimed in claim 1, wherein the first end of the second oil pipe comprises a connecting portion used for connecting with the first holding member.

[0011] The submersible pump for gas station as claimed in claim 1, wherein the connecting portion comprises a screw thread.

[0012] The submersible pump for gas station as claimed in claim 1, wherein the pump head comprises a base and a cover arranged on the base and extending into the base, the cover is connected with the pump pipe, and the cover and the base comprise a flow channel used for accommodating oil passing through.

[0013] The submersible pump for gas station as claimed in claim 1, wherein the pump head further comprises a valve assembly, a junction box and a capacitor, the valve assembly is arranged in the cover and is in communication with the flow channel and used for controlling the opening and closing of the flow channel, the capacitor and the junction box are respectively arranged in a junction cavity and a capacitor cavity on the base and are in communication with an external circuit.

[0014] The submersible pump of this application features an electrical conduit located outside the oil line, thus not occupying the flow area within the oil line. This results in low fluid flow resistance, high pump efficiency, and low energy consumption. Furthermore, it facilitates the inspection and replacement of the electrical conduit and its internal cables. The pump head structure can also be optimized, with the corresponding parts connected to the pump designed as two parallel sections. This results in a simple, compact structure with small dimensions, low material consumption, low weight, and easy manufacturing, saving costs. Moreover, when the pump length needs to be changed, the pump tube can be easily extended or retracted via an adjustment device, simplifying operation and saving manpower. Attached Figure Description

[0015] The preferred embodiments of this utility model will now be described in further detail with reference to the accompanying drawings, wherein:

[0016] Figure 1 This is a schematic diagram of a submersible pump structure according to an embodiment of this application;

[0017] Figure 2 An exploded view of a submersible pump according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of a pump tube assembly structure according to an embodiment of this application;

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

[0020] Figure 5 An exploded view of an adjusting device according to an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of a motor connector according to an embodiment of this application;

[0022] Figure 7A and Figure 7B This is a schematic diagram of the structure of both ends of the motor connector according to an embodiment of this application;

[0023] Figure 8A and Figure 8B This is a cross-sectional view of a motor connector according to an embodiment of this application;

[0024] Figure 9 This is a schematic diagram of a pump head according to an embodiment of this application;

[0025] Figure 10 This is a top view of a pump head according to an embodiment of this application;

[0026] Figures 11A-11D This is a cross-sectional view of a pump head according to an embodiment of this application;

[0027] Figure 12 An exploded view of a pump head according to an embodiment of this application;

[0028] Figure 13 schematic view of a valve assembly according to one embodiment of the present application;

[0029] Figure 14 schematic view of a valve assembly according to one embodiment of the present application;

[0030] Figure 15 schematic view of a pump head structure 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 schematic 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 view of a valve assembly according to another embodiment of the present application;

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

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

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

[0038] Figure 23 exploded view of a siphon valve structure according to another embodiment of the present application; and

[0039] Figure 24 schematic view of a pump head structure according to another embodiment of the present application. DETAILED DESCRIPTION

[0040] The principles and spirits 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 spirits of the present application clearer and more thorough, and to enable those skilled in the art to better understand and implement the principles and spirits of the present application. The exemplary embodiments provided herein are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments herein, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] In the following detailed description, reference will be made to the accompanying drawings, which form a part of this description, illustrating certain embodiments of the present application. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in this specification are intended to accommodate modifications or changes therein and are intended to be non-limiting examples of embodiments of the present application. Accordingly, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. The use of the terms "including", "comprising", "consisting of", "by reference to" and variations thereof herein is intended to encompass the items listed thereafter, variants thereof, equivalents thereof, and additional items not specifically listed. The use of the terms "including", "comprising", "consisting of" and variations thereof herein is intended to encompass the items listed thereafter, variants thereof, equivalents thereof, and additional items not specifically listed. The use of the terms "by reference to" and variations thereof herein is intended to encompass the items listed thereafter, variants thereof, equivalents thereof, and additional items not specifically listed.

[0042] The present application provides a new type of submersible pump, through the improvement of the pump pipe of the submersible pump, the resistance of the oil flow can be effectively reduced, the conveying efficiency of the submersible pump is improved, and the energy consumption of the submersible pump is reduced. Correspondingly, the structure of the pump head of the submersible pump can also be optimized, so that the structure of the submersible pump is simple and compact, the size of the submersible pump is reduced, the consumption of materials is reduced, the weight is reduced, and the manufacturing of the submersible pump is facilitated, the manufacturing, packaging, transportation and other costs are saved, and the later maintenance of the submersible pump is facilitated, and the difficulty and cost of maintenance are reduced.

[0043] The technical solutions of the present application are further illustrated by specific embodiments. Those skilled in the art should understand that under the guidance of the following embodiments, other alternative solutions with the same or similar functions can also be realized. These alternative solutions are also within the protection scope of the present application.

[0044] Figure 1 The structure of the submersible pump according to an embodiment of the present application is shown. Figure 2 The exploded view of the submersible pump according to an embodiment of the present application is shown.

[0045] As shown in the figure, the submersible pump 100 includes a submersible motor 110, a pump pipe assembly 120 and a pump head 130. The submersible motor 110 can be arranged in an oil storage tank, the pump head 130 is arranged on the stand pipe structure at the top opening of the oil storage tank, and the pump pipe assembly 120 is connected between the submersible motor 110 and the pump head 130. When oil needs to be added, the submersible motor can work on the oil to pressurize the oil through the pump pipe and the pump head into the oil filling pipeline after the power supply is connected to the submersible motor. The pump head 130 is used to introduce the power supply and supply power to the submersible motor through the pump pipe assembly, and at the same time, the pressurized oil output by the submersible motor is transported to the oil filling machine. One end of the pump pipe assembly is connected with the pump head, and the other end is connected with the submersible motor, so as to connect the power supply introduced by the pump head to the submersible motor, and transport the pressurized oil output by the submersible motor to the pump head.

[0046] The detailed structure of each part of the submersible pump will be described in detail below. As those skilled in the art will understand, this application does not improve the submersible motor, which can be any submersible motor of any structure in the art, and will not be described further here.

[0047] Figure 3 This is a schematic diagram of a pump tube assembly structure according to an embodiment of this application.

[0048] As shown in the figure, the pump pipe assembly 300 includes a pump pipe and a motor connector 330. The motor connector 330 is connected to one end of the pump pipe and can connect the pump pipe to the submersible motor, providing power to the submersible motor and outputting the oil delivered by the submersible motor.

[0049] In some embodiments, the pump pipe may include an oil passage pipe 310 and an electrical passage pipe 320. The electrical passage pipe 320 is disposed outside the oil passage pipe 310 and arranged parallel to it, thus ensuring that there are no parts within the oil passage pipe that encroach on the flow area, resulting in low frictional resistance to oil flow. This helps reduce the operating power of the submersible pump, allowing it to deliver more oil to the fuel dispenser with the same power consumption. For example, using a 2-inch pump pipe, compared to existing technologies, the flow area of ​​the oil passage pipe in this application can be increased by 18% to 39%. Furthermore, the electrical passage pipe's external location facilitates inspection. When problems are found with the electrical passage pipe or its cables, the electrical passage pipe can be easily disassembled to troubleshoot, making inspection and subsequent maintenance convenient and flexible.

[0050] In some embodiments, the oil pipe 310 and the electrical pipe 320 are straight pipes, which may be made of seamless steel pipe or aluminum profile pipe, and the material may be Q235 or 6061 grade, etc. In some embodiments, both ends of the oil pipe 310 and the electrical pipe 320 are provided with connecting threads, which can be used to connect to the motor connector and the pump head. In some embodiments, the size of the oil pipe 310 may be 2 inches or other smaller sizes; the size of the electrical pipe 320 may not exceed 0.85 inches.

[0051] In some embodiments, the oil pipe 310 and the electrical pipe 320 can also be adjustable pump pipes, whose lengths can be adjusted to allow the submersible pump to be used in oil storage tanks of different sizes, increasing the applicability of the submersible pump. In some embodiments, the oil pipe 310 may include a first section of oil pipe 311 and a second section of oil pipe 312. One end of the first section of oil pipe 311 extends into the second section of oil pipe 312 from one end of the second section of oil pipe 312, and can extend and retract along the axial direction of the second section of oil pipe 312, thereby adjusting the length of the oil pipe; the electrical pipe 320 may include a first section of electrical pipe 321 and a second section of electrical pipe 322, one end of the first section of electrical pipe 321 extends into the second section of electrical pipe 322 from one end of the second section of electrical pipe 322, and can extend and retract along the axial direction of the second section of electrical pipe 322, thereby adjusting the length of the electrical pipe.

[0052] In some embodiments, the pump pipe assembly may further include an adjusting device 340, which may be disposed on the oil pipe 310 and / or the electrical pipe 320, and can adjust the length of the oil pipe and the electrical pipe. In some embodiments, the adjusting device 340 may include a first holding member, a second holding member, and a connector. The first holding member may be disposed at the end of the second oil pipe 312 that accommodates the first oil pipe 311, the second holding member is disposed on the first oil pipe 311, and the connector is connected between the first and second holding members to fix the distance between the first and second holding members. The connector can constrain the position and distance between the first and second holding members. When the second holding member is in a locked state, the first and second oil pipes are locked; when the second holding member is in an unlocked state, the first oil pipe can extend and retract axially along the second oil pipe. In some embodiments, the first holding member may also be disposed at the end of the second segment of the circuit tube 322 that accommodates the first segment of the circuit tube 321, and the second holding member may be disposed on the first segment of the circuit tube 321. In some embodiments, the first holding member and / or the second holding member extend at least partially outward to form a circuit tube receiving portion for accommodating the second segment of the circuit tube, which can prevent the circuit tube from shifting and allow the circuit tube to extend and retract with the oil pipe.

[0053] Combination Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of an adjustment device according to an embodiment of the present application. Figure 5 This is an exploded view of an adjustment device according to an embodiment of this application.

[0054] According to one embodiment of this 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 can be clamped to one end of the second section of the oil pipe, and 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 can be clamped to the first section of the oil pipe, and 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, which are connected between the first fastener and the second fastener. When the third clamp 344 and the fourth clamp 345 are clamped to the first section of the oil pipe, the first section of the oil pipe and the second section of the oil pipe are locked and cannot extend or retract. When the third clamp 344 and the fourth clamp 345 are not tightly fastened to the first section of the oil passage, the first section of the oil passage can extend and retract axially along the second section of the oil passage. In some embodiments, the first and second fasteners can be screws, such as screws with an M6 or M8 specification.

[0055] In some embodiments, when the first clamp 341 and the second clamp 342 can be clamped to one end of the second section of the oil pipe, and the third clamp 344 and the fourth clamp 345 can be clamped to the first section of the oil pipe, a certain gap is included between the first clamp and the second clamp, and between the third clamp and the fourth clamp, to ensure that they are clamped to the oil pipe. In some embodiments, the first connecting piece 347 and the second connecting piece 348 are disposed in the gap 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, or the third clamp and the fourth clamp, to prevent failure to clamp the oil pipe.

[0056] In some embodiments, the end of the second oil passage pipe connected to the regulating device may further include a connecting portion for connecting with 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 passage pipe and the regulating device and increasing the connection strength. Correspondingly, the inner surfaces of the first clamp 341 and / or the second clamp 342 may also include threads.

[0057] In some embodiments, the circuit tube receiving portion may include a recess 349 extending outward from the first clamp 341 and / or the third clamp 344, and the second section of the circuit tube may be accommodated in the recess 349 to prevent the circuit tube from shifting during the extension and retraction process.

[0058] The adjusting device of this application requires only a few sets of fasteners to secure the two clamping parts into a locked state. The fastening operation is simple, easy, and labor-saving. The adjusting device, with its outwardly extending recess, allows other pipelines, such as the conduit for a submersible motor, to pass through, thus creating flow space inside the oil pipe. Furthermore, the adjusting device of this application can be easily assembled and disassembled on the pump pipe, and in case of component damage, it can be replaced on-site at the gas station, making its use and maintenance flexible.

[0059] Combination Figure 6 , Figure 7A and Figure 7B by Figure 8A and Figure 8B . Figure 6 This is a schematic diagram of a motor connector according to an embodiment of this application. Figure 7A and Figure 7B This is a schematic diagram of the structure of both ends of the motor connector according to an embodiment of this application. Figure 8A and Figure 8B This is a cross-sectional view of a motor connector according to an embodiment of this application.

[0060] In some embodiments, the motor connector 330 includes a housing 331, which has multiple oil passages 332 and electrical passages 333 internally. (See reference) Figure 7A At one end of the motor connector 330, which connects to the oil pipe 310 and the electrical pipe 320, multiple oil passages converge at one point and are arranged parallel to and spaced apart from the electrical passage 333, thus allowing connection to the parallel oil pipe 310 and the electrical pipe 320; Reference Figure 7B The motor connector 330 is connected to the submersible motor at one end, with the circuit channel 333 located at the center and the oil passage 332 arranged around the circuit channel 333, so that it can be connected to the submersible motor. In some embodiments, the connection between the oil passage and the oil pipe, and the connection between the circuit channel and the circuit pipe, both include connecting threads.

[0061] In some embodiments, the cable plug can be inserted into the submersible motor through the circuit channel 333. The circuit channel 333 may also include a plug positioning groove 3331, which can accommodate and position the cable plug, so that when the motor connector 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 channel 333 may also include a sealing groove 3332, which can be used to accommodate a sealing ring to prevent oil from entering the circuit pipe 320 through the circuit channel 333 or affecting the connection between the cable plug and the submersible motor.

[0062] In some embodiments, the base 331 may be cast, and its outer dimensions gradually taper from the end connected to the submersible motor to the end connected to the pump pipe. In some embodiments, the outer periphery of the base may also include multiple reinforcing ribs 3311, which are connected to both ends of the base 331 to increase the structural strength of the base. In some embodiments, one of the reinforcing ribs is provided with an oblique channel 3333, 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 the end connected to the pump pipe, where it is arranged parallel to the oil passage. In some embodiments, multiple reinforcing ribs 3311 may also be spaced apart from multiple oil passages, or in other words, multiple reinforcing ribs can divide the oil passage into multiple channels, where each oil passage corresponds to the oil outlet channel of the submersible motor.

[0063] In some embodiments, the end of the base 331 connected to the submersible motor may further include an outer edge 3312, which may extend outward along the plane perpendicular to the outer surface of the base. The outer edge 3312 may include a connecting portion for connecting the motor connector to the submersible motor. In some embodiments, the connecting portion may include one or more connecting holes 3313, which may be evenly spaced along the circumference of the outer edge to accommodate fasteners (e.g., bolts) passing through, connecting the motor connector to the submersible motor. In some embodiments, the outer edge may also include a limiting portion, such as a positioning pin hole 3314, which may be used for circumferential positioning of the motor connector and the submersible motor, aligning the flow channels of the motor connector and the submersible motor, and aligning the cable plug and the submersible motor terminal block located in the circuit channel. In some embodiments, the base may be made of metal, such as ASTM A356 or HT200.

[0064] The pump tube assembly of this application can serve as a connector between the submersible pump head and the submersible motor, with one end mounted on the pump head and the other end connected to the submersible motor. The interface size of the motor connector for the submersible motor is consistent with existing products, and existing submersible motors can be used with the pump tube assembly of this application. Furthermore, the pump tube assembly of this application separates the electrical conduit and the oil conduit, allowing for a relatively simple design of the pump head structure. This application further optimizes the structure of the pump head.

[0065] Figure 9 This is a schematic diagram of a pump head according to an embodiment of the present application. Figure 10 This is a top view of a pump head according to an embodiment of this application. Figures 11A-11D This is a cross-sectional view of a pump head according to an embodiment of this application. Figure 12 This is an exploded view of a pump head according to an embodiment of this application.

[0066] 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. The cover 920 is disposed on the base 910 and can close the base 910; the valve assembly 930 can be disposed on the cover and can be used to control the flow of oil 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 to connect the pump head to an external power source. In some embodiments, the pump head 900 may further include a cable bridge 970, which connects the capacitor 940 and the cover 920, and can be used to connect and isolate the capacitor cavity and the conduit, so that the submersible pump meets the requirements of explosion-proof design, separating the capacitor cavity and the conduit into two independent cavities.

[0067] In some embodiments, the base 910 is generally cylindrical and includes: a riser mounting port 911, a cover mounting port 912, a flow passage 913, a capacitor cavity 914, and a wiring cavity 915. The riser mounting port 911 is used to connect the base to the riser of the oil storage tank; the cover mounting port 912 is used to connect to the cover 920; the flow passage 913 is disposed between the riser mounting port 911 and the cover mounting port 912, and communicates with both; 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 passage 913.

[0068] In some embodiments, the riser mounting port 911 may include threads, allowing the base to be connected to the top riser of the oil storage tank via a threaded connection. In some embodiments, the cover mounting port 912 includes a limiting groove for positioning the cover 920 when it is connected to the base.

[0069] In some embodiments, the capacitor cavity is a cavity with an opening at one end, while 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 have a through hole between them for circuit connection. In some embodiments, the base 910 may also include a wiring cavity cover 916, which may be disposed at one end of the wiring cavity. The power cord at the gas station site can enter from one end of the wiring cavity opening and be connected to the capacitor and junction box inside the wiring cavity. In some embodiments, the base 910 may also include a capacitor cavity cover (not shown in the figure), which can be used to seal the capacitor cavity.

[0070] 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 channel 913. This outlet can be connected to the fuel dispenser's pipeline to output oil. In some embodiments, the direction of the oil outlet is parallel to the axial direction of the flow channel, thereby 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 channel. In some embodiments, the base 910 may further include multiple oil outlets, which may be spaced apart along the circumference of the base. In some embodiments, the portion of the oil outlet connected to the flow channel fully utilizes the projected area of ​​the oil outlet side of the pump head base, using a nearly rectangular area laterally, gradually transitioning towards the oil outlet, and during the transition, the oil flow direction changes from radial to axial. This can sufficiently expand the oil flow area, reduce flow resistance, and also reduce the spatial dimensions of the pump head base, making it compact.

[0071] In some embodiments, the cover 920 includes a first end face 921, a second end face 922, and a connecting post 923. The first end face 921 is disposed on the cover mounting opening 912 of the base 910 and can close the base; the second end face 922 extends into the base and is located in the flow channel 913 of the base; the connecting post 923 connects the first end face 921 and the second end face 922.

[0072] In some embodiments, the shape of the first end face 921 is the same as that of the cover mounting opening on the base and is located within the cover mounting opening. A bolt can be used to press the first end face onto the cover mounting opening, thereby sealing the base. In some embodiments, an elastic element, such as a spring, can also be provided on the bolt. When the first end face 921 is pressed against the cover mounting opening, the spring on the bolt is compressed; when the cover needs to be removed, the bolt is loosened, and the spring pushes the first end face of the cover out of the mounting position, facilitating disassembly and assembly. In some embodiments, the side of the first end face 921 that contacts the cover mounting opening includes a sealing groove (not shown in the figure), which can be used to accommodate a sealing ring for a sealing connection between the cover and the base.

[0073] In some embodiments, the second end face 922 can cooperate with the flow channel to form a seal, dividing the flow channel 913 into an upper flow channel 9131 and a lower flow channel 9132. When the base is installed on the oil storage tank, the flow channel can be sealed to prevent oil and gas diffusion. In some embodiments, the second end face 922 includes a sealing groove (not shown in the figure) on the circumference of the contact area with the flow channel, which can be used to accommodate a sealing ring to seal and isolate the upper flow channel 9131 and the lower flow channel 9132.

[0074] In some embodiments, the connecting post 923 may further include an oil passage 9231 and an electrical passage 9232 arranged in parallel, which can be connected to the oil line and electrical line of the pump pipe, respectively. In some embodiments, the oil passage and the electrical passage run through the entire connecting post and extend beyond the first end face, and the cable bridge 970 can be connected to the electrical passage. In some embodiments, the sidewall of the connecting post may include one or more openings 9233 located between the first end face and the second end face, which can connect the oil passage 9231 to the upper flow passage 9131, so that oil can enter the upper flow passage through the oil passage and be output from the oil outlet. In some embodiments, at least a portion of the sidewall of the connecting post between the first end face and the second end face may be hollow, which can increase the channel area for oil to flow into the upper flow passage and reduce flow resistance. In some embodiments, the connecting post 923 may also extend beyond the second end face away from the first end face, and can be connected to the pump pipe. In some embodiments, the end of the connecting post 923 extending beyond the second end face may include a connecting portion, which can be used to connect to the pump pipe. In some embodiments, the connection may include threads that may be provided on the inner walls of the oil passage 9231 and the electrical passage 9232, and may be threaded to the oil pipe and the electrical pipe, respectively.

[0075] Combination Figure 13 and Figure 14 , Figure 13 This is a schematic diagram of a valve assembly according to one embodiment of the present application. Figure 14 This is a cross-sectional view of a valve assembly according to an embodiment of this application.

[0076] 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 is disposed in the oil passage of the cover body. It can be used to allow or prevent oil from passing 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. The valve cover is disposed at the first end face of the cover body, the valve seat 932 is disposed 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 sealed to the cover body. In some embodiments, when the gas station needs a submersible pump to draw oil from other oil storage tanks, the valve assembly 930 may also include a vacuum channel 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, so as to draw oil from other oil storage tanks into the submersible pump.

[0077] In some embodiments, the valve cover 931 is generally a disc-shaped structure. It may include a cover plate 9311 and a side plate 9312 extending outward from the cover plate. The outer surface of the side plate 9312 may include threads for connection between the valve cover and the cover body. In some embodiments, the valve cover 931 may further include a sealing groove 9313, which may be disposed at the connection between the cover plate 9311 and the side plate 9312, for sealing the installation gap between the valve cover and the cover body. In some embodiments, the valve cover 931 may further include a valve core receiving channel 9314, which extends outward from the cover plate 9311 in the direction extending towards the side plate, for receiving one end of the valve core. In some embodiments, the axis of the valve core receiving channel 9314 coincides with the axis of the valve cover.

[0078] In some embodiments, the valve cover 931 includes at least a partial vacuum channel 9341, the axis of which is parallel to the axis of the valve cover and extends outward in the direction extending from the cover plate to the side plate. In some embodiments, the vacuum channel 9341 may also include a mounting hole 9315 that mates with other partial vacuum channels. This mounting hole is a stepped hole, wherein the diameter gradually increases in the direction extending from the vacuum channel 9341, and a stepped surface is formed between the different diameters. This stepped surface can be used for axial positioning when installing with other partial vacuum channels. In some embodiments, the larger diameter portion of the mounting hole 9315 sequentially includes a sealing groove 9316 and a retaining ring groove 9317. The sealing groove can be used to install a sealing ring to seal the installation between different partial vacuum channels, and the retaining ring groove can be used to fix the connection between different partial vacuum channels.

[0079] In some embodiments, the valve cover 931 may further include protrusions 9318 and 9319 extending outward from the cover plate, respectively disposed outside the valve core receiving channel 9314 and the vacuum channel 9341, and extending in a direction opposite to the extending direction of the side plate. In some embodiments, the inner wall of the protrusions may include threads, which can be used to connect other structures. In some embodiments, the protrusions 9318 and 9319 may be interconnected, and their outer contours are similar to a figure "8", which can be used as the force application position for tightening the tooling when the valve cover is installed onto the cover body.

[0080] In some embodiments, the valve seat 932 is an integral annular structure. One end of the valve seat 932 may have a diameter slightly smaller than the other end, resulting in a conical surface on the outer side of the valve seat 932, facilitating guidance into the oil passage of the cover during installation. In some embodiments, the valve port 9321 where the valve seat 932 contacts the valve core is a stepped port, and the ridge position 9322 where the valve core contacts the stepped port is designed as a conical surface for mating with the valve core. In some embodiments, the apex angle of the conical surface is 50°-70°. In some embodiments, the valve seat 932 also has a partial vacuum channel 9342, which extends from the side of the valve seat 932 and along the axial direction of the valve seat, inserting into the mounting hole 9315 of the valve cover, and can be connected to the vacuum tube channel 9341, thereby connecting the valve seat and the valve cover.

[0081] In some embodiments, the valve core 933 includes a baffle 9331 and a connecting rod 9332. The baffle 9331 can be located near or away from the valve port 9321 of the valve seat 932, thereby closing or opening the oil passage. The connecting rod 9332 is disposed on the baffle and extends outward from it, extending into the valve core receiving channel 9314 of the valve cover, and can move within the valve core receiving channel. In some embodiments, the valve core 933 may further include a sealing gasket 9333, which can be disposed on the baffle and face the valve seat. When the baffle approaches the valve port 9321, the sealing gasket can be pressed against the valve port, completely closing the oil passage and preventing oil from passing through. In some embodiments, the baffle 9331 may include a positioning protrusion 9334, which can be used to fit the sealing gasket 9333 and position the sealing gasket.

[0082] In some embodiments, the valve core may further include an elastic reset member 9335, which can be used to reset the baffle during movement. In some embodiments, the elastic reset member 9335 may be a spring, which is sleeved on the connecting rod 9332, with one end abutting against the baffle 9331 and the other end abutting against the end of the valve core receiving channel. When the oil pressure pushes the baffle away from the valve port, the spring is compressed; when there is no oil pressure, the spring pushes the baffle closer to the valve port.

[0083] In some embodiments, the valve core may further include a guide cone 9336, disposed on the side of the baffle away from the connecting rod. This guide cone, when pushed open by oil, creates a vacuum in the oil passage between its outer surface and the valve seat due to the Venturi effect, thus functioning as a siphon valve. In some embodiments, the outer surface of the guide cone is a conical surface, with a cone apex angle ranging from 50° to 70°. In some embodiments, the guide cone 9336 may include a through-hole extending along the connecting rod axis. This through-hole may be a stepped hole, used for mounting the guide cone onto the baffle. For example, the guide cone can be mounted onto the baffle by installing this through-hole onto a positioning protrusion 9334 and securing it to the protrusion with a retaining ring. In some embodiments, mounting the guide cone onto the positioning protrusion can also cooperate with the baffle to clamp the sealing gasket, preventing it from moving under oil immersion and affecting control of the oil passage.

[0084] In some embodiments, when the pressure in the pipeline connected to the submersible pump at the gas station exceeds expectations due to water hammer or the operation of parallel submersible pumps, the submersible pump needs to regulate the pressure in the pipeline to prevent damage to the valve assembly. The valve assembly may also include a pressure regulating valve stem 935, which may be disposed in the valve core 933. In some embodiments, the valve core 933 may include a mounting hole 9337, which passes through the connecting rod and the baffle along the axial direction of the connecting rod. The pressure regulating valve stem 935 is disposed in the mounting hole 9337 and can move along the mounting hole, thereby controlling the opening and closing of the mounting hole and regulating the pressure on both sides of the valve core.

[0085] In some embodiments, the pressure regulating valve stem 935 may include a through rod 9351, a return spring 9352, and a stop 9353. One end of the through rod 9351 has a protruding conical surface, which passes through a mounting hole 9337 from one end of a baffle plate. The protruding conical surface can press against the baffle plate, and the other end of the through rod can exit the mounting hole. The return spring 9352 is sleeved on the through rod, and the stop is located at the end of the through rod 9351 that exits the mounting hole. One end of the return spring abuts against the end of a connecting rod, and the other end abuts against the stop. In some embodiments, the contact point between the conical surface of the through rod and the baffle plate includes a sealing ring 9354, which can be used for sealing between the pressure regulating valve stem and the valve core. When the conical surface of the through rod moves away from the baffle plate, the mounting hole of the valve core opens, connecting both sides of the valve core, allowing pressure exchange between the two sides, and compressing the return spring. When the pressures on both sides are equal, the return spring pushes the conical surface of the through rod closer to the baffle plate, closing the mounting hole of the valve core.

[0086] In some embodiments, the stop 9353 is connected to the through rod by a thread, or the end of the through rod and the stop are connected and the inner wall of the stop includes threads, so that the position of the stop on the through rod can be adjusted, the compression of the return spring can be adjusted, and 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 the through rod open to release pressure into the oil tank.

[0087] In some embodiments, the valve assembly 930 may further include a one-way valve 936, which may be disposed in the vacuum channel to allow only unidirectional flow in the vacuum channel, preventing oil from flowing out of the submersible pump from the vacuum tube channel. In some embodiments, the one-way valve 936 includes a valve body 9361 and an inner core 9362. The valve body 9361 is disposed on the protrusion 9319 of the valve cover, and the inner core 9362 is movable within the valve body. In some embodiments, the one-way valve 936 may further include a plug 9363, which may be disposed on the valve body to seal the vacuum channel; the plug can be removed when the vacuum channel is needed.

[0088] In some embodiments, the valve assembly 930 may further include a lifting ring 937, which may be disposed on the valve cover and serve as a lifting point for the installation and maintenance of the entire pump. In some embodiments, the lifting ring 937 can be connected to the valve cover via a lifting ring head. The first end of the lifting ring head includes a threaded blind hole for connecting a lifting ring; the second end of the lifting ring head includes an external thread for connecting to the protrusion 9318 of the valve cover. In some embodiments, the second end of the lifting ring head may also include a blind hole that communicates with the valve core receiving channel 9314, accommodating a portion of the valve core, thereby reducing the height of the valve cover, which helps to reduce the volume of the valve cover and lower costs.

[0089] The valve assembly of this application can be a complete module, mounted on the pump head cover via a valve cover. A seal is formed between the outer side of the valve cover and the cover body via a sealing ring, and a seal is also formed between the outer side of the valve seat and the cover body via a sealing ring. When the submersible pump starts, oil is pressurized from the submersible motor and enters the oil passage of the pump head cover through the pump pipe. In the oil passage, the valve core is pushed open and enters the upper flow passage of the pump head base, and can be delivered to the external pipeline of the submersible pump through the oil outlet connected to the upper flow passage; thus, the oil flow direction is "L"-shaped, which simplifies the oil flow path and facilitates oil flow. After refueling, the valve core returns to the closed position under the combined action of the elastic reset element and the pipeline oil pressure, preventing the oil in the pipeline from returning to the oil tank. When the pressure in the oil station pipeline exceeds the expected pressure due to water hammer effect or the operation of parallel submersible pumps, the pressure regulating valve stem in the valve core will be pushed open under the action of oil pressure, releasing a portion of the liquid back into the pump pipe for pressure relief. When the pressure relief reaches the expected value, the pressure regulating valve stem will be reset under the action of the return spring, and the sealing ring at the bottom of the pressure regulating valve stem will seal the mounting hole in the valve core.

[0090] During the refueling process of the submersible pump, the venturi effect occurs between the guide cone of the valve core and the valve port of the valve seat, resulting in a localized decrease in liquid pressure and the creation of a vacuum. When the gas station needs the submersible pump to draw oil from other storage tanks using the siphon effect generated by the vacuum, the seal of the one-way valve in the vacuum channel can be removed, and the oil extraction pipeline can be connected. The oil flows through the guide cone of the valve core, and the created vacuum can be used to draw external liquid into the pump head. When external liquid is drawn into the pump head, the refueling machine does not refuel externally. The pump head may also include a return valve core 960. It is located on the second end face of the valve cover and can control the return flow of external liquid back into the storage tank. In some embodiments, the second end face may include a return channel 9221, which can be used to accommodate the return valve core, and the return valve core can be controlled to open or close.

[0091] refer to Figure 11D In some embodiments, the return valve core 960 includes a return valve stem 961, a retaining ring 962, and a spring 963. The first end of the return valve stem 961 is located on the side of the second end face of the cover away from the first end face, and the second end of the return valve stem 961 extends through the second end face and toward the first end face. The retaining ring 962 is disposed on the second end of the return valve stem. The spring 963 is sleeved on the return valve stem, with one end abutting against the retaining ring and the other end abutting against the second end face. In some embodiments, the first end of the return valve stem 961 may include a sealing ring, and the first end of the return valve stem may be pressed against or away from the second end face. When the submersible pump needs to draw liquid from other containers into the storage tank, the corresponding refueling nozzle of the submersible pump can be lifted from the refueling machine without refueling, triggering the submersible pump start signal, keeping the submersible pump motor running but not supplying oil externally. At this point, the oil pressure inside the submersible pump is at its highest performance curve. The first end of the return valve stem is pushed away from the second end face by the oil pressure, opening the return channel 9221. Oil is then released into the storage tank through the riser pipe connected to the pump head base, forming an internal circulation state. The spring is in a compressed state. After the liquid is pumped out, the first end of the return valve stem can be pressed against the second end face under the force of the spring, closing the return channel. In some embodiments, the opening pressure of the return valve core is higher than the opening pressure of the pressure regulating valve stem.

[0092] In some embodiments, the first end of the return valve stem 961 may include an outwardly protruding boss 9611, which facilitates the return valve stem being pressed against the second end face. In some embodiments, the diameters of the first and second ends of the return valve stem 961 are larger than the diameter of the middle portion. In other words, the removal of some material from the middle portion of the return valve stem ensures that the return valve stem is centrally positioned in the return channel, which is beneficial for sealing in the closed state and for guiding during movement; it also helps to increase the area of ​​the oil return cross-section and accelerate the return speed when the oil is in a return flow state.

[0093] The submersible pump of this application, by placing the electrical conduit outside the oil pipe, does not occupy the flow area inside the oil pipe, resulting in low oil flow resistance, which is beneficial to improving efficiency and reducing energy consumption. It also simplifies the pump pipe assembly, facilitating the inspection and replacement of the electrical conduit and its internal cables. When the overall pump length needs to be changed, the telescopic pump pipe operation is simple and saves manpower. Furthermore, the pump head's adaptation to the oil and electrical pipe configuration allows for a simple internal flow channel shape, a large flow area, and low flow loss. The valve assembly's axis also coincides with the oil pipe's axis, allowing for direct sealing within the oil pipe. In the oil outlet direction of the pipe, the oil in the pump pipe can pass through the valve assembly without too many turns, resulting in low flow resistance and good sealing effect. Furthermore, the liquid flow channel and electrical channel in the pump head are arranged separately, without interference between them, resulting in a simple structure, compact shape, and light weight. Most of the functions required for special operating conditions of submersible pumps can also be integrated into the valve assembly, making assembly and maintenance very simple. In addition, the wiring cavity, capacitor cavity, and other structures are set on the pump head base, which can reduce the labor intensity of lifting work when the pull-out part of the submersible pump needs to be removed from the oil storage tank.

[0094] This application also proposes another structure for a submersible pump. The pump tubing assembly is connected to... Figure 1 The embodiments are similar, so only the pump head structure will be described here. Details are as follows:

[0095] Figure 15 This is a schematic diagram of a pump head structure according to another embodiment of this application. Figure 16 This is a top view of a pump head according to another embodiment of this application. Figures 17A-17E This is a cross-sectional view of a pump head according to another embodiment of this application. Figure 18 This is an exploded view of a pump head according to another embodiment of this application.

[0096] 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. The cover 1520 is disposed on the base 1510 and can close the base 1510; the valve assembly 1530 can be disposed on the cover and can be used to control the flow of oil through the pump head; the capacitor 1540 can be disposed on the base; the junction box 1550 is connected to the capacitor 1540 and can be disposed on the base, and can be used to connect the pump head to an external power source. In some embodiments, the pump head 1500 may further include a cable bridge 1570, which connects the capacitor 1540 and the cover 1520, and can be used to connect and isolate the capacitor cavity and the conduit, so that the submersible pump meets the requirements of explosion-proof design, separating the capacitor cavity and the conduit into two independent cavities.

[0097] In some embodiments, the base 1510 is generally cylindrical and includes: a riser mounting port 1511, a cover mounting port 1512, a flow passage 1513, a capacitor cavity 1514, and a wiring cavity 1515. The riser mounting port 1511 is used to connect the base to the riser of the oil storage tank; the cover mounting port 1512 is used to connect to the cover 1520; the flow passage 1513 is disposed between the riser mounting port 1511 and the cover mounting port 1512, and communicates with both; the capacitor cavity 1514 and the wiring cavity 1515 are disposed on one side of the base and are parallel to the axis of the flow passage 1513.

[0098] In some embodiments, the riser mounting port 1511 may include threads, allowing the base to be connected to the top riser of the oil storage tank via a threaded connection. In some embodiments, the cover mounting port 1512 includes a limiting groove for positioning the cover 1520 when it is connected to the base.

[0099] In some embodiments, the capacitor cavity is a cavity with an opening at one end, while 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 have a through hole between them for circuit connection. In some embodiments, the base 1510 may also include a wiring cavity cover 1516, which may be disposed at one end of the wiring cavity. The power cord at the gas station site can enter from one end of the wiring cavity opening and be connected to the capacitor and junction box inside the wiring cavity. In some embodiments, the base 1510 may also include a capacitor cavity cover (not shown in the figure), which can be used to seal the capacitor cavity.

[0100] In some embodiments, the base 1510 may further include a plurality of oil outlets 1517 disposed on the side wall of the base and connected to the flow channel 1513, which can be used to connect to the pipeline of the fuel dispenser to output oil. In some embodiments, the direction of the outlet may be perpendicular to the axial direction of the flow channel. In some embodiments, the plurality of oil outlets 1517 may be spaced apart in the circumferential direction of the base. In some embodiments, the portion of the oil outlet connected to the flow channel makes full use of the projected area of ​​the oil outlet side of the pump head base, adopting a nearly rectangular area laterally, gradually transitioning to the oil outlet. This can sufficiently expand the oil flow area, reduce flow resistance, and also reduce the spatial dimensions of the pump head base, making it compact. In some embodiments, the direction of the oil outlet is parallel to the axial direction of the flow channel, and during the transition of the oil outlet, the oil flow direction changes from radial to axial, which is beneficial to increasing the diameter of the oil outlet.

[0101] In some embodiments, the cover 1520 includes a first end face 1521, a second end face 1522, and a connecting post 1523. The first end face 1521 is disposed on the cover mounting opening 1512 of the base 1510 and can close the base; the second end face 1522 extends into the base and is located in the flow channel 1513 of the base; the connecting post 1523 connects the first end face 1521 and the second end face 1522.

[0102] 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 within the cover mounting opening. Bolts can be used to press the first end face onto the cover mounting opening, thereby sealing the base. In some embodiments, the bolts can be connected to the cover via the side wall of the base. If the bolts are directly connected to the second end face of the cover via the side wall of the base, the peripheral dimensions of the pump head can be further reduced, optimizing the volume of the pump head.

[0103] In some embodiments, the second end face 1522 can cooperate with the flow channel to form a seal, dividing the flow channel 1513 into an upper flow channel 15131 and a lower flow channel 15132. When the base is installed on the oil storage tank, the flow channel can be sealed to prevent oil and gas diffusion. In some embodiments, the second end face 1522 includes a sealing groove (not shown in the figure) on the circumference of the contact area with the flow channel, which can be used to accommodate a sealing ring to seal and isolate the upper flow channel 15131 and the lower flow channel 15132.

[0104] 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 connected to the oil line and electrical line of the pump pipe, respectively. In some embodiments, the connecting post 1523 may further extend outward from the second end face away from the first end face, and can be connected to the pump pipe, thereby connecting the oil passage 15231 and the electrical passage 15232 to the oil line and electrical line, respectively. In some embodiments, the end of the connecting post 1523 extending outward from 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 disposed on the inner walls of the oil passage 15231 and the electrical passage 15232, and can be threadedly connected to the oil line and electrical line, respectively. In some embodiments, the oil passage and the electrical passage pass through the entire connecting post and extend outward from the first end face, and the cable bridge 1570 can be connected to the electrical passage. In some embodiments, the sidewall of the connecting column may include one or more openings 15233 located between the first end face and the second end face, allowing the oil passage 15231 to communicate with the upper flow passage 15131, so that oil can enter the upper flow passage through the oil passage and be discharged from the oil outlet. In some embodiments, at least a portion of the sidewall of the connecting column between the first end face and the second end face may be hollow, which can increase the channel area for oil to flow into the upper flow passage and reduce flow resistance.

[0105] Combination Figure 19 and Figure 20 , Figure 19 This is a schematic diagram of a valve assembly according to another embodiment of this application. Figure 20 This is a cross-sectional view of a valve assembly according to another embodiment of this application.

[0106] 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 is disposed in the oil passage of the cover body. It can be used to allow or prevent oil from passing through the oil passage 15231. In some embodiments, the valve assembly 1530 includes: a valve cover 1531 and a valve core 1533. The valve cover is disposed at the first end face of the cover body, and one end of the valve core 1533 extends into the valve cover 1531, while the other end abuts against the second end face of the cover body. In some embodiments, the valve cover 1531 is sealed to the cover body. In some embodiments, the valve assembly 1530 may further include a valve seat (not shown in the figure), which may be disposed at the second end face of the cover body and sealed to the cover body, and the valve core may abut against the valve seat.

[0107] In some embodiments, the valve cover 1531 is generally a disc-shaped structure. It may include a cover plate 15311 and a side plate 15312 extending outward from the cover plate. The outer surface of the side plate 15312 may include threads for 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 disposed at the connection between the cover plate 15311 and the side plate 15312, and may 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 receiving channel 15314, which extends outward from the cover plate 15311 in the direction extending towards the side plate, and may be used to receive one end of the valve core. In some embodiments, the axis of the valve core receiving channel 15314 coincides with the axis of the valve cover.

[0108] In some embodiments, the valve cover 1531 may further include a protrusion 15318 extending outward from the cover plate, disposed outside the valve core receiving channel 15314, and extending in a direction opposite to the extending direction of the side plate. In some embodiments, the inner wall of the protrusion may include threads, which can be used to connect other structures. In some embodiments, the outer surface of the protrusion may be hexagonal, which can be used as a force application position for tightening the tooling when the valve cover is installed onto the cover body.

[0109] In some embodiments, the valve core 1533 includes a baffle 15331 and a connecting rod 15332. The baffle 15331 can be located near or away from the second end face of the cover, thereby closing or opening the oil passage. The connecting rod 15332 is disposed on the baffle and extends outward from it, extending into the valve core receiving channel 15314 of the valve cover, and can move within the valve core receiving channel. In some embodiments, the valve core 1533 may further include a sealing gasket 15333, which can be disposed on the baffle and face the second end face. When the baffle approaches the second end face, the sealing gasket can be pressed against the second end face, completely closing the oil passage and preventing oil from passing through. In some embodiments, the baffle 15331 may include a positioning protrusion 15334, which can be used to fit the sealing gasket 15333 and position the sealing gasket.

[0110] In some embodiments, the valve core may further include an elastic reset member 15335, which can be used to reset the baffle during movement. In some embodiments, the elastic reset member 15335 may be a spring, which is sleeved on the connecting rod 15332, with one end abutting against the baffle 15331 and the other end abutting against the end of the valve core receiving channel. When the oil pressure pushes the baffle away from the valve port, the spring is compressed; when there is no oil pressure, the spring pushes the baffle closer to the valve port.

[0111] In some embodiments, the valve core may further include a guide 15336 disposed on the side of the baffle away from the connecting rod, which can be used to guide the movement of the valve core. In some embodiments, the guide 15336 may include a through hole extending along the axis of the connecting rod, which can be used for mounting the guide to the baffle. For example, the guide can be mounted to the baffle by mounting the through hole to the positioning protrusion 15334 and securing it with a retaining ring. In some embodiments, mounting the guide to the positioning protrusion can also cooperate with the baffle to clamp the sealing gasket, preventing the sealing gasket from moving under the immersion of oil, thus affecting the control of the oil passage. In some embodiments, the guide may include a plurality of guide posts spaced apart in the circumferential direction of the guide and extending into the oil passage, which can effectively prevent the valve core from deviating during movement, thus affecting the control of the oil passage.

[0112] In some embodiments, when the pressure in the pipeline connected to the submersible pump at the gas station exceeds expectations due to water hammer or the operation of parallel submersible pumps, the submersible pump needs to regulate the pressure in the pipeline to prevent damage to the valve assembly. The valve assembly may also include a pressure regulating valve stem 1535, which may be disposed within the valve core 1533. In some embodiments, the valve core 1533 may include a mounting hole 15337, which passes through the connecting rod and the baffle along the axial direction of the connecting rod. The pressure regulating valve stem 1535 is disposed in the mounting hole 15337 and can move along the mounting hole, thereby controlling the opening and closing of the mounting hole and regulating the pressure on both sides of the valve core.

[0113] In some embodiments, the pressure regulating valve stem 1535 may include a through rod 15351, a return spring 15352, and a stop 15353. One end of the through rod 15351 has a protruding conical surface, which passes through the mounting hole 15337 from one end of the stop plate. The protruding conical surface can press against the stop plate, and the other end of the through rod can exit the mounting hole. The return spring 15352 is sleeved on the through rod, and the stop is located at the end of the through rod 15351 that exits the mounting hole. One end of the return spring abuts against the end of the connecting rod, and the other end abuts against the stop. In some embodiments, the contact point between the conical surface of the through rod and the stop plate includes a sealing ring 15354, which can be used for sealing between the pressure regulating valve stem and the valve core. When the conical surface of the through rod moves away from the stop plate, the mounting hole of the valve core opens, connecting both sides of the valve core, allowing pressure exchange between the two sides, and compressing the return spring. When the pressures on both sides are equal, the return spring pushes the conical surface of the through rod closer to the stop plate, closing the mounting hole of the valve core.

[0114] In some embodiments, the stop 15353 is connected to the through rod by a thread, or the end of the through rod and the stop are connected and the inner wall of the stop includes threads, so that the position of the stop on the through rod can be adjusted, the compression of the return spring can be adjusted, and 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 the through rod open to release pressure into the oil tank.

[0115] In some embodiments, the valve assembly 1530 may further include a lifting ring 1537, which may be disposed on the valve cover and serve as a lifting point for the installation and maintenance of the entire pump. In some embodiments, the lifting ring 1537 may be connected to a protrusion 15318 on the valve cover. In some embodiments, the lifting ring may be integrally formed with the protrusion.

[0116] The valve assembly of this application can be a complete module, mounted on the pump head cover via a valve cover. A seal can be formed between the valve cover and the cover body via a sealing ring. When the submersible pump starts, oil is pressurized from the submersible motor and enters the oil passage of the cover body through the pump pipe. In the oil passage, the valve core is pushed open and enters the upper flow passage of the pump head base. It can then be delivered to the external pipeline of the submersible pump through the oil outlet connected to the upper flow passage. This results in an "L"-shaped oil flow direction, simplifying the oil flow path and facilitating oil flow. After refueling, the valve core returns to the closed position under the combined action of the elastic reset element and the pipeline oil pressure, preventing the remaining oil in the pipeline from returning to the oil tank. When the pressure in the oil station pipeline exceeds the expected pressure due to water hammer effect or the operation of parallel submersible pumps, the pressure regulating valve stem in the valve core will be pushed open under the action of oil pressure, releasing a portion of the liquid back into the pump pipe for pressure relief. When the pressure relief reaches the expected value, the pressure regulating valve stem will be reset under the action of the return spring, and the sealing ring at the bottom of the pressure regulating valve stem will seal the mounting hole in the valve core.

[0117] When a gas station needs a submersible pump to draw fuel from other storage tanks, the pump head may also include a siphon valve 1560. This valve, mounted on the base, controls the return flow of external fuel to the storage tank. (Reference) Figure 17B In some embodiments, the base may include a return channel 1518, which connects to the outside of the pump head, the upper flow channel 15131, and the lower flow channel 15132, and can be used to accommodate a siphon valve 1560. The siphon valve can also control the opening and closing of the return channel 1518. In some embodiments, when the submersible pump does not need to draw oil from other storage tanks, the siphon valve can be replaced with a sealing bolt, which can block the return channel and seal and isolate the outside of the pump head, the upper flow channel 15131, and the lower flow channel 15132 from each other.

[0118] Combination Figure 21 , Figure 22A , Figure 22B as well asFigure 23 . Figure 21 This is a schematic diagram of a siphon valve structure according to another embodiment of this application. Figure 22A and Figure 22B This is a cross-sectional view of a siphon valve structure according to another embodiment of this application. Figure 23 This is an exploded view of a siphon valve structure according to another embodiment of this 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.

[0119] In some embodiments, the valve body 1561 is cylindrical in shape and includes a valve core cavity 15611 inside, which can accommodate a valve core 1563. The valve core cavity 15611 extends through 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, a 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, communicating between the lower end of the valve core cavity 15611 and the second end of the valve body, and communicating the valve core cavity with the lower flow channel 15132. In some embodiments, the first flow channel 15612 is a diffusion channel, that is, the diameter of the first flow channel gradually increases from the valve core cavity towards 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 disposed in the circumferential direction of the valve body and communicate with the upper end of the valve core cavity, communicating the valve core cavity with the upper flow channel 15131. In some embodiments, the valve body 1561 further includes an oil inlet 15614, which is perpendicular to the axis of the valve body and is disposed at the junction of the valve core cavity and the first flow channel.

[0120] In some embodiments, the first check valve 1565 is located at the outlet of the first flow channel, or at the second end of the valve body, to prevent oil backflow. In some embodiments, when the submersible pump activates its siphon function, the submersible pump outlet needs to be closed to 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 secure the valve body in the return flow channel 1518.

[0121] In some embodiments, the valve core 1563 is disposed in the valve core cavity of the valve body and maintains a certain distance H from the first flow channel. In some embodiments, the distance H can be 1.3-3.8 mm. In some embodiments, the valve core 1563 may include a third flow channel 15631, the axis of which coincides with the valve core axis and extends through the entire valve core. In some embodiments, the diameter of the third flow channel is smaller than the diameter of the first flow channel. When oil enters the first flow channel through the third flow channel, a vacuum is generated due to the change in the flow channel diameter, which can then be drawn towards the oil inlet. In some embodiments, the end of the valve core near the first flow channel can be a conical surface, which can further generate a vacuum.

[0122] In some embodiments, the manifold 1564 can be sleeved on the oil inlet of the valve body 1561, and can be used to connect to other pipelines. In some embodiments, the manifold 1564 can also surround the circumferential space of the valve body, and can rotate in the circumferential direction of the valve body 1561, facilitating connection to other pipelines. In some embodiments, a second check valve 1566 is provided on the manifold to prevent oil from flowing back into other pipelines. In some embodiments, the opening pressure of the second check valve is lower than the opening pressure of the first check valve.

[0123] When the submersible pump is normally outputting oil, the pressure in the pipeline connected to the pump is typically around 0.2 MPa. At this time, the first check valve remains closed, and the siphon valve is not working. When the siphon valve needs to be activated, the submersible pump starts but does not refuel, keeping the outlet valve, oil nozzle, etc., all closed. At this time, the submersible pump operates at near-zero flow, and the internal pressure is the design maximum pressure, close to 0.3 MPa. Under this pressure, the first check valve of the siphon valve will open, and the oil in the submersible pump will enter the second flow channel of the valve body through the upper flow channel, then enter the third flow channel of the valve core, and finally enter the first flow channel of the valve body through the third flow channel of the valve core. This process creates a vacuum between the valve core and the first flow channel. Subsequently, the oil enters the return oil channel of the pump head through the first check valve, and returns to the oil storage tank through the lower flow channel, completing the internal circulation of the submersible 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 pump can still operate at a near-zero flow rate, maintaining sufficient internal pressure to push open the first check valve. At this point, connecting the second check valve installed on the manifold to the vacuum line allows liquid to be drawn from other containers through the vacuum line.

[0124] This application also proposes another structure for a submersible pump. The pump tubing assembly is connected to... Figure 1 The embodiments are similar, so only the pump head structure will be described here. Details are as follows:

[0125] Figure 24 This is a schematic diagram of a pump head structure according to another embodiment of this application.

[0126] As shown in the figure, the structure of pump head 2400 is similar to... Figure 9 The pump head 900 in the embodiments has a similar structure. The difference is that the base structure of the pump head 2400 omits the capacitor cavity and wiring cavity, and the base also does not include a capacitor or junction box. An external power source can be directly connected to the circuit conduit via an electrical channel on the cover, thereby further reducing the size of the pump head and allowing direct connection to an external three-phase power supply. In some embodiments, the pump head 2400 may include a terminal 2410, which can be connected to the electrical channel on the cover for direct connection to an external power source.

[0127] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A submersible pump for use in gas stations, characterized in that, include: Pump head, pump tubing, and submersible motor; The submersible motor is installed in the oil storage tank and is used to extract oil from the oil storage tank; The pump pipe is connected between the pump head and the submersible motor, and includes an oil pipe and an electrical pipe. The oil pipe is used to allow oil to pass through and leave the oil storage tank, and the electrical pipe is used to allow electrical wires to pass through and supply power to the submersible motor. The pump head is positioned above the opening of the oil storage tank and is used to allow oil and electrical wires to pass through. The circuit tube is located outside the oil circuit tube and is arranged parallel to the oil circuit tube.

2. The submersible pump for gas stations according to claim 1, characterized in that, Both the oil pipe and the electrical pipe are retractable pipes, used to adjust the position of the submersible motor in the oil storage tank.

3. The submersible pump for gas stations according to claim 2, characterized in that, The oil pipe includes a first oil pipe section and a second oil pipe section. One end of the first oil pipe section can be disposed in the second oil pipe section from the first end of the second oil pipe section, and can extend and retract along the axial direction of the second oil pipe section. The circuit pipe includes a first circuit pipe section and a second circuit pipe section. One end of the first circuit pipe section is disposed in the second circuit pipe section, and can extend and retract along the axial direction of the second circuit pipe section.

4. The submersible pump for gas stations according to claim 3, characterized in that, Further includes: An adjusting device is provided on the oil pipe and / or the circuit pipe and is used to lock the length of the oil pipe and / or the circuit pipe.

5. The submersible pump for gas stations according to claim 4, characterized in that, The adjusting device includes a first holding member, a second holding member, and a connecting member. The first holding member is disposed at the end of the second section of the oil pipe that accommodates the first section of the oil pipe. The second holding member is disposed on the first section of the oil pipe. The connecting member connects the first holding member and the second holding member to fix the distance between the first holding member and the second holding member. When the second holding member is in a locked state, the first section of the oil pipe and the second section of the oil pipe are locked. When the second holding member is in an unlocked state, the first section of the oil pipe can extend and retract axially along the second section of the oil pipe.

6. The submersible pump for gas stations according to claim 5, characterized in that, The first holding member and / or the second holding member extend at least partially outward to form a circuit tube receiving portion to receive the second circuit tube segment.

7. The submersible pump for gas stations according to claim 5, characterized in that, The first end of the second section of the oil pipe includes a connecting part for connecting to the first holding member.

8. The submersible pump for gas stations according to claim 7, characterized in that, The connection includes threads.

9. The submersible pump for gas stations according to claim 1, characterized in that, The pump head includes a base and a cover, the cover being disposed on the base and extending into the base, the cover being connected to the pump pipe, and the cover and the base including flow channels for accommodating the passage of oil.

10. The submersible pump for a gas station according to claim 9, characterized in that, The pump head further includes: a valve assembly, a junction box, and a capacitor. The valve assembly is disposed in the cover and communicates with the flow channel to control the opening and closing of the flow channel. The capacitor and the junction box are respectively disposed in the wiring cavity and capacitor cavity on the base and are connected to the external circuit.

Images