Oil-submerged pump and pile-up valve for pump head of oil-submerged pump

Abstract

The utility model relates to an oil-submerged pump and an integrated valve for a pump head of the oil-submerged pump. The integrated valve comprises a valve cover and a valve seat, the first end of the valve element extends into the valve deck, and the second end of the valve element is far away from or abuts against the valve seat. The elastic reset piece is arranged between the valve cover and the valve element and controls the valve element to move; the pressure regulating valve rod is arranged in the valve core, can extend into the valve cover from the valve core, and can move along the valve core; the pressure relief spring is arranged between the pressure regulating valve rod and the valve element and used for controlling the valve rod to move. Wherein the valve element comprises a through mounting hole, the valve rod is arranged in the mounting hole, when the valve rod is located at the third position, the valve rod abuts against the valve element, and the mounting hole is closed, and when the valve rod is located at the fourth position, the valve rod leaves the valve element, and the mounting hole is opened. According to the integrated valve, multiple functions can be integrated in one module, use is flexible, and cost is low.

Description

Technical Field

[0001] This utility model relates to the field of refueling equipment, and in particular to a submersible pump and an integrated valve for the pump head of the submersible pump. Background Technology

[0002] In the fuel delivery system of a gas station, the submersible pump, as the core power unit, is typically mounted on the top riser structure of the storage tank via a flange. Generally, the storage tank is buried underground at the gas station, and a manhole is located at the top riser structure. Routine operations requiring manual intervention, such as the installation and maintenance of the submersible pump, must be performed by construction personnel inside the manhole. The submersible pump consists of a pump head, pump tubing, and a submersible motor. When the submersible pump is installed on the storage tank, the pump head protrudes into the manhole, the pump tubing extends into the storage tank, and the submersible motor is submerged in the fuel. When refueling is needed, the refueling nozzle is raised, a control relay receives a signal, and drives the corresponding submersible pump to operate, thus delivering fuel from the storage tank to the refueling dispenser. However, current submersible pumps have complex structures, with control, pressure relief, and pressure regulation functions designed into different components on the pump head, resulting in complex structures and high costs. Utility Model Content

[0003] To address the technical problems existing in the prior art, this utility model proposes an integrated valve for a submersible pump head, comprising: a valve cover and a valve seat, which are arranged parallel and spaced apart; a valve core, the first end of which extends into the valve cover, and the second end which moves away from or abuts against the valve seat; when the valve core is in the first position, the valve core abuts against the valve seat; when the valve core is in the second position, the valve core moves away from the valve seat; an elastic reset member is disposed between the valve cover and the valve core, and controls the movement of the valve core; and a pressure regulating element. A valve stem, disposed within the valve core and extending into the valve cover, is movable along the valve core; and a pressure relief spring, disposed between the pressure regulating valve stem and the valve core, is used to control the movement of the valve stem; wherein the valve core includes a through mounting hole, the valve stem is disposed in the mounting hole, when the valve stem is in a third position, the valve stem abuts against the valve core, and the mounting hole is closed; when the valve stem is in a fourth position, the valve stem moves away from the valve core, and the mounting hole is opened.

[0004] The integrated valve for the submersible pump head as described above further includes a vacuum channel, one end of which communicates with the outside of the valve cover, and the other end is connected to the valve seat and communicates with the first position of the valve core.

[0005] The integrated valve for the submersible pump head as described above further includes a one-way valve disposed in the vacuum passage.

[0006] The integrated valve for a submersible pump head as described above, wherein the valve core includes a baffle and a connecting rod, the baffle being close to the valve seat, one end of the connecting rod being connected to the baffle, and the other end extending into the valve cover.

[0007] As described above, the integrated valve for a submersible pump head further includes a guide cone disposed on the side of the baffle away from the connecting rod, the guide cone including a conical surface that tapers along the valve seat extension assembly, wherein the cone apex angle is 50°-70°.

[0008] As described above, the integrated valve for a submersible pump head further includes one or more guide posts disposed on the side of the baffle away from the connecting rod and extending into the valve seat to guide the movement of the valve core.

[0009] As described above, the integrated valve for the submersible pump head includes a pressure regulating valve stem comprising a through rod and a stop. One end of the through rod includes an outwardly protruding conical surface that abuts against the baffle of the valve core. The stop is located at the other end of the through rod and is used to block the pressure relief spring.

[0010] As described above, in the integrated valve for the submersible pump head, the stop on the through rod is adjustable in position to adjust the spring force of the pressure relief spring.

[0011] The integrated valve for the submersible pump head as described above further includes a lifting ring for lifting the valve seat, which is disposed on the valve cover.

[0012] According to another aspect of this application, a submersible pump is proposed, comprising: an integrated valve for the submersible pump head as described above.

[0013] The integrated valve of this application can integrate multiple functions such as control, pressure relief, pressure regulation, and lifting into one module, which is flexible in use and low in cost. Attached Figure Description

[0014] The preferred embodiments of this utility model will now be described in further detail with reference to the accompanying drawings, wherein:

[0015] Figure 1 This is a schematic diagram of a submersible pump structure according to an embodiment of this application;

[0016] Figure 2 An exploded view of a submersible pump according to an embodiment of this application;

[0017] Figure 3 This is a schematic diagram of a pump tube assembly structure according to an embodiment of this application;

[0018] Figure 4 This is a schematic diagram of a pump head according to an embodiment of this application;

[0019] Figure 5 This is a top view of a pump head according to an embodiment of this application;

[0020] Figures 6A-6D This is a cross-sectional view of a pump head according to an embodiment of this application;

[0021] Figure 7 This is a schematic diagram of a valve assembly according to an embodiment of this application;

[0022] Figure 8 This is a cross-sectional view of a valve assembly according to an embodiment of this application;

[0023] Figure 9 This is a schematic diagram of a pump head structure according to another embodiment of this application;

[0024] Figure 10 A top view of a pump head according to another embodiment of this application;

[0025] Figures 11A-11E This is a cross-sectional view of a pump head according to another embodiment of this application;

[0026] Figure 12 This is a schematic diagram of a valve assembly according to another embodiment of this application;

[0027] Figure 13 A cross-sectional view of a valve assembly according to another embodiment of this application;

[0028] Figure 14 This is a schematic diagram of a siphon valve structure according to another embodiment of this application;

[0029] Figure 15A and Figure 15B A cross-sectional view of a siphon valve structure according to another embodiment of this application; and

[0030] Figure 16 This is an exploded view of a siphon valve structure according to another embodiment of this application. Detailed Implementation

[0031] The principles and spirit of this application will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided to make the principles and spirit of this application clearer and more thorough, enabling those skilled in the art to better understand and implement the principles and spirit of this application. The exemplary embodiments provided herein are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described herein without inventive effort are within the scope of protection of this application.

[0032] In the following detailed description, reference can be made to the accompanying drawings, which form part of this application and illustrate specific embodiments of the application. In the drawings, similar reference numerals describe substantially similar components in different figures. Specific embodiments of the application are described in sufficient detail below to enable those skilled in the art to implement the technical solutions of this application. It should be understood that other embodiments may be utilized or structural, logical, or electrical changes may be made to the embodiments of this application. Furthermore, similar terms including "first," "second," and "third" in this application are used only to distinguish one entity (or operation) from another, and are not intended to require or imply any order or association between these entities (or operations).

[0033] This application proposes an integrated valve that integrates multiple functions such as control, pressure relief, pressure regulation, and lifting into a single module, offering flexibility and low cost. It also allows for adjustment of the pressure relief start pressure, enabling quick and easy adjustment to the most economical and reasonable pressure relief pressure based on the application environment. The axial movement of the check valve core and pressure relief valve stem in the opening and closing processes of this integrated valve features a sufficient guiding design. The length-to-diameter ratio of the shaft and hole mating section during the guiding process is greater than 2, ensuring that the opening and closing actions of the valve core or pressure relief valve stem do not deviate from the center, thus preventing misalignment and sealing failure. It also ensures that the pressure relief valve stem does not experience eccentric compression leading to sealing failure. Furthermore, the valve core of this integrated valve is unrestricted in its circumferential position, allowing it to rotate at any angle around its own axis without affecting the sealing effect, making it more convenient to use and reducing the failure rate.

[0034] The technical solutions of this application are further illustrated below through specific embodiments. Those skilled in the art should understand that, based on the teachings of the following embodiments, other alternative solutions capable of achieving the same or similar functions are possible. These alternative solutions are also within the protection scope of this application.

[0035] Figure 1 This is a schematic diagram of a submersible pump structure according to an embodiment of this application. Figure 2 This is an exploded view of a submersible pump according to an embodiment of this application.

[0036] 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 installed in the oil storage tank, and the pump head 130 is installed on a riser structure at the top opening of the oil storage tank. The pump pipe assembly 120 connects the submersible motor 110 and the pump head 130. When refueling is required, after the submersible motor is powered on, it performs work on the oil, thereby pressurizing the oil and delivering it through the pump pipe and pump head into the refueling pipeline. The pump head 130 receives power and supplies it to the submersible motor through the pump pipe assembly, while simultaneously delivering the pressurized oil output by the submersible motor to the refueling machine. One end of the pump pipe assembly is connected to the pump head, and the other end is connected to the submersible motor, allowing the power supplied to the pump head to be connected to the submersible motor, and the pressurized oil output by the submersible motor to be delivered to the pump head.

[0037] 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.

[0038] Figure 3 This is a schematic diagram of a pump tube assembly structure according to an embodiment of this application.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] The pump pipe 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. Furthermore, this application separates the electrical conduit from the oil conduit, allowing for a relatively simple design of the pump head structure to which it connects. This application also further optimizes the pump head structure.

[0045] Figure 4 This is a schematic diagram of a pump head according to an embodiment of the present application. Figure 5 This is a top view of a pump head according to an embodiment of this application. Figures 6A-6D This is a cross-sectional view of a pump head according to an embodiment of this application.

[0046] As shown in the figure, the pump head 400 includes a base 410, a cover 420, a valve assembly 430, a capacitor 440, and a junction box 450. The cover 420 is disposed on the base 410 and can close the base 410; the valve assembly 430 can be disposed on the cover and can be used to control the flow of oil through the pump head; the capacitor 440 can be disposed on the base; the junction box 450 is connected to the capacitor 440 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 400 may further include a cable bridge 470, which connects the capacitor 440 and the cover 420, 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.

[0047] In some embodiments, the base 410 is generally cylindrical and includes: a riser mounting port 411, a cover mounting port 412, a flow passage 413, a capacitor cavity 414, and a wiring cavity 415. The riser mounting port 411 connects the base to the riser of the oil storage tank; the cover mounting port 412 connects to the cover 420; the flow passage 413 is located between the riser mounting port 411 and the cover mounting port 412, and communicates with both; the capacitor cavity 414 and the wiring cavity 415 are located on one side of the base and are parallel to the axis of the flow passage 413.

[0048] In some embodiments, the riser mounting port 411 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 412 includes a limiting groove for positioning the cover 420 when it is connected to the base.

[0049] 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 410 may also include a wiring cavity cover 416, 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 410 may also include a capacitor cavity cover (not shown in the figure), which can be used to seal the capacitor cavity.

[0050] In some embodiments, the base 410 may further include an oil outlet 417, which is disposed on the side wall of the base and communicates with the flow channel 413. This outlet can be connected to the pipeline of the fuel dispenser 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 410 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.

[0051] In some embodiments, the cover 420 includes a first end face 421, a second end face 422, and a connecting post 423. The first end face 421 is disposed on the cover mounting opening 412 of the base 410 and can close the base; the second end face 422 extends into the base and is located in the flow channel 413 of the base; the connecting post 423 connects the first end face 421 and the second end face 422.

[0052] In some embodiments, the shape of the first end face 421 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 421 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 421 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.

[0053] In some embodiments, the second end face 422 can cooperate with the flow channel to form a seal, dividing the flow channel 413 into an upper flow channel 4131 and a lower flow channel 4132. 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 422 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 4131 and the lower flow channel 4132.

[0054] In some embodiments, the connecting post 423 may further include an oil passage 4231 and an electrical passage 4232 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 470 can be connected to the electrical passage. In some embodiments, the sidewall of the connecting post may include one or more openings 4233 located between the first end face and the second end face, which can connect the oil passage 4231 to the upper flow passage 4131, 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 423 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 423 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 4231 and the electrical passage 4232, and may be threaded to the oil pipe and the electrical pipe, respectively.

[0055] Combination Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of a valve assembly according to one embodiment of the present application. Figure 8 This is a cross-sectional view of a valve assembly according to an embodiment of this application.

[0056] In some embodiments, the valve assembly 430 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 4231. In some embodiments, the valve assembly 430 includes: a valve cover 431, a valve seat 432, and a valve core 433. The valve cover is disposed at the first end face of the cover body, the valve seat 432 is disposed at the second end face of the cover body, and one end of the valve core 433 extends into the valve cover 431, and the other end abuts against the valve seat 432. In some embodiments, the valve cover 431 and the valve seat 432 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 430 may also include a vacuum channel 434, which is connected between the valve cover 431 and the valve seat 432 and extends to the valve cover 431 and the valve seat 432, so as to draw oil from other oil storage tanks into the submersible pump.

[0057] In some embodiments, the valve cover 431 is generally a disc-shaped structure. It may include a cover plate 4311 and a side plate 4312 extending outward from the cover plate. The outer surface of the side plate 4312 may include threads for connection between the valve cover and the cover body. In some embodiments, the valve cover 431 may further include a sealing groove 4313, which may be disposed at the connection between the cover plate 4311 and the side plate 4312, for sealing the installation gap between the valve cover and the cover body. In some embodiments, the valve cover 431 may further include a valve core receiving channel 4314, which extends outward from the cover plate 4311 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 4314 coincides with the axis of the valve cover.

[0058] In some embodiments, the valve cover 431 includes at least a partial vacuum channel 4341, 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 4341 may also include a mounting hole 4315 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 4341, 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 4315 sequentially includes a sealing groove 4316 and a retaining ring groove 4317. 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.

[0059] In some embodiments, the valve cover 431 may further include protrusions 4318 and 4319 extending outward from the cover plate, respectively disposed outside the valve core receiving channel 4314 and the vacuum channel 4341, 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 4318 and 4319 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.

[0060] In some embodiments, the valve seat 432 is an integral annular structure. One end of the valve seat 432 may have a diameter slightly smaller than the other end, resulting in a conical surface on the outer side of the valve seat 432, facilitating guidance into the oil passage of the cover during installation. In some embodiments, the valve port 4321 where the valve seat 432 contacts the valve core is a stepped port, and the ridge position 4322 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 432 also has a partial vacuum channel 4342, which extends from the side of the valve seat 432 and along the axial direction of the valve seat, inserting into the mounting hole 4315 of the valve cover, and can be connected to the vacuum tube channel 4341, thereby connecting the valve seat and the valve cover.

[0061] In some embodiments, the valve core 433 includes a baffle 4331 and a connecting rod 4332. The baffle 4331 can be located near or away from the valve port 4321 of the valve seat 432, thereby closing or opening the oil passage. The connecting rod 4332 is disposed on the baffle and extends outward from it, extending into the valve core receiving channel 4314 of the valve cover, and can move within the valve core receiving channel. In some embodiments, the valve core 433 may further include a sealing gasket 4333, which can be disposed on the baffle and face the valve seat. When the baffle approaches the valve port 4321, 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 4331 may include a positioning protrusion 4334, which can be used to fit the sealing gasket 4333 and position the sealing gasket.

[0062] In some embodiments, the valve core may further include an elastic reset member 4335, which can be used to reset the baffle during movement. In some embodiments, the elastic reset member 4335 may be a spring, which is sleeved on the connecting rod 4332, with one end abutting against the baffle 4331 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.

[0063] In some embodiments, the valve core may further include a guide cone 4336, 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 cone, with an apex angle ranging from 50° to 70°. In some embodiments, the guide cone 4336 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 4334 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.

[0064] 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 435, which may be disposed in the valve core 433. In some embodiments, the valve core 433 may include a mounting hole 4337, which passes through the connecting rod and the baffle along the axial direction of the connecting rod. The pressure regulating valve stem 435 is disposed in the mounting hole 4337 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.

[0065] In some embodiments, the pressure regulating valve stem 435 may include a through rod 4351, a return spring 4352, and a stop 4353. One end of the through rod 4351 has a protruding conical surface, which passes through the mounting hole 4337 from one end of the 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 4352 is sleeved on the through rod, and the stop is located at the end of the through rod 4351 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 baffle plate includes a sealing ring 4354, 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.

[0066] In some embodiments, the stop 4353 is connected to the through rod by a thread, or in other words, the end of the through rod and the stop connected to the stop and the inner wall of the stop include 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.

[0067] In some embodiments, the valve assembly 430 may further include a one-way valve 436, 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 436 includes a valve body 4361 and an inner core 4362. The valve body 4361 is disposed on the protrusion 4319 of the valve cover, and the inner core 4362 is movable within the valve body. In some embodiments, the one-way valve 436 may further include a plug 4363, which may be disposed on the valve body to seal the vacuum channel; the plug can be removed when the vacuum channel is needed.

[0068] In some embodiments, the valve assembly 430 may further include a lifting ring 437, 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 437 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 4318 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 4314, 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.

[0069] 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.

[0070] 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 460. 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 4221, which can be used to accommodate the return valve core, and the return valve core can be controlled to open or close.

[0071] refer to Figure 6D In some embodiments, the return valve core 460 includes a return valve stem 461, a retaining ring 462, and a spring 463. The first end of the return valve stem 461 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 461 extends through the second end face and toward the first end face. The retaining ring 462 is disposed on the second end of the return valve stem. The spring 463 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 461 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 4221. 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.

[0072] In some embodiments, the first end of the return valve stem 461 may include an outwardly protruding boss 4611, 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 461 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.

[0073] 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.

[0074] 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:

[0075] Figure 9 This is a schematic diagram of a pump head structure according to an embodiment of this application. Figure 10 This is a top view of a pump head according to an embodiment of this application. Figures 11A-11E This is a cross-sectional view of a pump head according to an embodiment of this application.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] In some embodiments, the base 910 may further include a plurality of oil outlets 917 disposed on the side wall of the base and connected to the flow channel 913, 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 917 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.

[0081] 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.

[0082] 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. 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.

[0083] 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.

[0084] 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 connecting post 923 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 9231 and the electrical passage 9232 to the oil line and electrical line, respectively. In some embodiments, the end of the connecting post 923 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 9231 and the electrical passage 9232, 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 970 can be connected to the electrical passage. In some embodiments, the sidewall of the connecting column may include one or more openings 9233 located between the first end face and the second end face, allowing the oil passage 9231 to communicate with the upper flow passage 9131, 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.

[0085] Combination Figure 12 and Figure 13 , Figure 12 This is a schematic diagram of a valve assembly according to one embodiment of the present application. Figure 13 This is a cross-sectional view of a valve assembly according to an embodiment of this application.

[0086] 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, which 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 and a valve core 933. The valve cover is disposed at the first 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 second end face of the cover body. In some embodiments, the valve cover 931 is sealed to the cover body. In some embodiments, the valve assembly 930 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.

[0087] 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.

[0088] In some embodiments, the valve cover 931 may further include a protrusion 9318 extending outward from the cover plate, disposed outside the valve core receiving channel 9314, 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.

[0089] 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 second end face of the cover, 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 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 9331 may include a positioning protrusion 9334, which can be used to fit the sealing gasket 9333 and position the sealing gasket.

[0090] 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.

[0091] In some embodiments, the valve core may further include a guide 9336 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 9336 may include a through hole extending along the connecting rod axis, 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 9334 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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 may be connected to a protrusion 9318 on the valve cover. In some embodiments, the lifting ring may be integrally formed with the protrusion.

[0096] 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 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. 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 oil remaining 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.

[0097] When a gas station needs a submersible pump to draw fuel from other storage tanks, the pump head may also include a siphon valve 960. This valve, mounted on the base, controls the return flow of external fuel to the storage tank. (Reference) Figure 11B In some embodiments, the base may include a return channel 918, which connects to the outside of the pump head, the upper flow channel 9131, and the lower flow channel 9132. This channel can accommodate a siphon valve 960, which can also control the opening and closing of the return channel 918. 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 9131, and the lower flow channel 9132 from each other.

[0098] Combination Figure 14 , Figure 15A , Figure 15B as well as Figure 16 . Figure 14 This is a schematic diagram of a siphon valve structure according to an embodiment of this application. Figure 15A and Figure 15B This is a cross-sectional view of a siphon valve structure according to an embodiment of this application. Figure 16 This is an exploded view of a siphon valve structure according to an embodiment of this application. In some embodiments, the siphon valve 960 may include a valve body 961, a valve cover 962, a valve core 963, a manifold 964, a first check valve 965, and a second check valve 966.

[0099] In some embodiments, the valve body 961 is cylindrical in shape and includes a valve core cavity 9611 inside, which can accommodate a valve core 963. The valve core cavity 9611 extends through the first end of the valve body, and the valve core 963 can be placed in the valve core cavity from the first end of the valve body. In some embodiments, a valve cover 962 is disposed on the first end of the valve body and can close the valve core cavity. In some embodiments, the valve body 961 further includes a first flow channel 9612, connecting the lower end of the valve core cavity 9611 and the second end of the valve body, and connecting the valve core cavity to the lower flow channel 9132. In some embodiments, the first flow channel 9612 is a diffusion channel, i.e., 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 961 further includes one or more second flow channels 9613, which are disposed in the circumferential direction of the valve body and connected to the upper end of the valve core cavity, connecting the valve core cavity to the upper flow channel 9131. In some embodiments, the valve body 961 further includes an oil inlet 9614, 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.

[0100] In some embodiments, a first check valve 965 is disposed 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 965 can also secure the valve body in the return flow channel 918.

[0101] In some embodiments, the valve core 963 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 963 may include a third flow channel 9631, 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.

[0102] In some embodiments, the manifold 964 can be sleeved on the oil inlet of the valve body 961, and can be used to connect to other pipelines. In some embodiments, the manifold 964 can also surround the circumferential space of the valve body, and can rotate in the circumferential direction of the valve body 961, facilitating connection to other pipelines. In some embodiments, a second check valve 966 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.

[0103] 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.

[0104] 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. An integrated valve for a submersible pump head, characterized in that, include: The valve cover and valve seat are arranged parallel and spaced apart. The valve core has a first end that extends into the valve cover and a second end that moves away from or abuts against the valve seat. When the valve core is in the first position, it abuts against the valve seat. When the valve core is in the second position, it moves away from the valve seat. An elastic reset element is disposed between the valve cover and the valve core, and controls the movement of the valve core; A pressure regulating valve stem, disposed within the valve core and extending into the valve cover, movable along the valve core; and A pressure relief spring is disposed between the pressure regulating valve stem and the valve core, and is used to control the movement of the valve stem; The valve core includes a through mounting hole, and the valve stem is disposed in the mounting hole. When the valve stem is in the third position, the valve stem abuts against the valve core, and the mounting hole is closed. When the valve stem is in the fourth position, the valve stem moves away from the valve core, and the mounting hole is opened.

2. The integrated valve for a submersible pump head according to claim 1, characterized in that, It further includes a vacuum channel, one end of which is connected to the outside of the valve cover, and the other end is connected to the valve seat and communicates with the first position of the valve core.

3. The integrated valve for a submersible pump head according to claim 2, characterized in that, Further includes: A one-way valve is provided in the vacuum channel.

4. The integrated valve for a submersible pump head according to claim 1, characterized in that, in, The valve core includes a baffle and a connecting rod. The baffle is close to the valve seat, and one end of the connecting rod is connected to the baffle, while the other end extends into the valve cover.

5. The integrated valve for a submersible pump head according to claim 4, characterized in that, The valve core also includes a guide cone disposed on the side of the baffle away from the connecting rod. The guide cone includes a conical surface that tapers along the valve seat extension assembly, wherein the apex angle of the conical surface is 50°-70°.

6. The integrated valve for a submersible pump head according to claim 4, characterized in that, The valve core also includes one or more guide posts disposed on the side of the baffle away from the connecting rod and extending into the valve seat to guide the movement of the valve core.

7. The integrated valve for a submersible pump head according to claim 4, characterized in that, The pressure regulating valve stem includes a through rod and a stop. One end of the through rod includes an outwardly protruding conical surface that can abut against the baffle of the valve core. The stop is located at the other end of the through rod and is used to block the pressure relief spring.

8. The integrated valve for a submersible pump head according to claim 7, characterized in that, The stop is adjustable in position on the through rod and is used to adjust the spring force of the pressure relief spring.

9. The integrated valve for a submersible pump head according to claim 1, characterized in that, It further includes a lifting ring for lifting the valve seat, which is disposed on the valve cover.

10. A submersible pump, characterized in that, include: The integrated valve for a submersible pump head as described in any one of claims 1-9.

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