Oil-submerged pump, pump head and siphon valve for pump head of oil-submerged pump

Abstract

The utility model relates to an oil-submerged pump, a pump head and a siphon valve for the pump head of the oil-submerged pump. The siphon valve comprises a valve body, the valve body is provided with a valve element cavity, an oil inlet, a first flow channel and a second flow channel, the first flow channel and the second flow channel are connected with the valve element cavity, the axis of the first flow channel coincides with the axis of the valve element cavity, the second flow channel is arranged on the periphery of the valve body, the axis of the second flow channel is parallel to the axis of the valve element cavity, and the oil inlet is formed in the intersection position of the valve element cavity and the first flow channel; the valve element is arranged in the valve element cavity of the valve body, the valve element comprises a third flow channel, and the third flow channel penetrates through the valve element and is connected with the first flow channel and the second flow channel; the first one-way valve is arranged at an outlet of the first flow channel; oil enters the valve element cavity through the second flow channel, flows into the first flow channel through the third flow channel and flows out of the valve body through the first flow channel, and the diameter of the first flow channel is larger than that of the third flow channel. The siphon valve can be independently configured and is flexible to use, and waste is reduced.

Description

Technical Field

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

[0002] In the fuel delivery system of a gas station, the submersible pump, as the core power unit, is typically mounted via a flange on the top riser structure of the storage tank. 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 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 the corresponding submersible pump is activated, thus delivering fuel from the storage tank to the refueling dispenser.

[0003] Gas station fuel supply systems are typically designed with several fuel dispensers corresponding to one underground storage tank, and different storage tanks do not simultaneously supply fuel dispensers to each other. When a storage tank is low on fuel while other tanks of the same type have more fuel, a siphon function needs to be installed on the submersible pump in the low-fuel tank to draw fuel from the tank with more fuel or a sludge tank and transfer it to the low-fuel tank. However, current submersible pump heads have complex structures, and the siphon function component, being part of the pump head, cannot be used independently, resulting in inflexible application. Furthermore, to accommodate the siphon function, a sealing diaphragm is used to seal the fuel inlet of the siphon valve, which significantly increases manufacturing costs. Utility Model Content

[0004] To address the technical problems existing in the prior art, this utility model proposes a siphon valve for a submersible pump head, comprising: a valve body having a valve core cavity, an oil inlet, and a first flow channel and a second flow channel connected to the valve core cavity, wherein the axis of the first flow channel coincides with the axis of the valve core cavity, the second flow channel is disposed around the valve body with its axis parallel to the axis of the valve core cavity, and the oil inlet is disposed at the intersection of the valve core cavity and the first flow channel; a valve core disposed in the valve core cavity of the valve body, the valve core including a third flow channel penetrating the valve core and connected to the first flow channel and the second flow channel; and a first check valve disposed at the outlet of the first flow channel; wherein, oil enters the valve core cavity through the second flow channel, flows into the first flow channel through the third flow channel, and then flows out of the valve body through the first flow channel, the diameter of the first flow channel being larger than the diameter of the third flow channel.

[0005] The siphon valve for the submersible pump head described above has a conical surface at one end of the valve core near the first flow channel.

[0006] The siphon valve for the submersible pump head described above includes a gap between the valve core and the first flow channel, the gap being 1.3-3.8 mm.

[0007] As described above, in the siphon valve for the submersible pump head, the diameter of the first flow channel gradually increases from the end closer to the valve core to the end farther away from the valve core.

[0008] The siphon valve for the submersible pump head described above further includes a manifold fitted onto the oil inlet of the valve body, and includes a vacuum channel inside to connect the oil inlet to other pipelines.

[0009] As described above, the siphon valve for the submersible pump head has a manifold surrounding the circumferential space of the valve body, which is rotatable in the circumferential direction of the valve body.

[0010] The siphon valve for the submersible pump head as described above further includes a second check valve disposed in the vacuum passage.

[0011] As described above, the siphon valve for a submersible pump head includes an opening that communicates with the valve core cavity for mounting the valve core, and a valve cover is provided at the opening to seal the valve core cavity.

[0012] According to another aspect of this application, a pump head for a submersible pump is provided, comprising: a base, which includes a riser mounting port, a cover mounting port, a flow channel, a capacitor cavity, and a wiring cavity, wherein the riser mounting port is connected to an oil storage tank, the cover mounting port is opposite to the riser mounting port, and the flow channel communicates with the riser mounting port and the cover mounting port; a cover, which includes a first end face, a second end face, and a connecting post, wherein the first end face is disposed on the cover mounting port of the base to close the base, the second end face extends into the base, and divides the flow channel into an upper flow channel and a lower flow channel, the lower flow channel communicating with the oil storage tank; A connecting post is connected between the first end face and the second end face. The connecting post includes an oil passage and an electrical passage arranged in parallel, which pass through the first end face and the second end face. The oil passage communicates with the upper flow passage. A valve assembly is disposed in the oil passage of the cover body for controlling the flow of oil. A siphon valve for the submersible pump head as described above is also provided. The base includes a return oil passage, and the siphon valve for the submersible pump head as described above is disposed in the return oil passage. The first flow channel communicates with the lower flow passage and the upper flow passage.

[0013] According to another aspect of this application, a submersible pump is proposed, including the pump head of the submersible pump as described above.

[0014] The siphon valve in this application can be an independent module and can be configured separately. Users who do not need this function do not need to select it, or it can be installed for short periods of time when used temporarily, making it flexible in use and reducing waste. 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 a pump head structure according to an embodiment of this application;

[0020] Figure 5 This is a top view of a pump head according to an embodiment of this application;

[0021] Figures 6A-6E This is a cross-sectional view of a pump head according to an embodiment of this application;

[0022] Figure 7 An exploded view of a pump head according to an embodiment of this application;

[0023] Figure 8 This is a schematic diagram of a valve assembly according to an embodiment of this application;

[0024] Figure 9 This is a cross-sectional view of a valve assembly according to an embodiment of this application;

[0025] Figure 10 This is a schematic diagram of a siphon valve structure according to an embodiment of this application;

[0026] Figure 11A and Figure 11B A cross-sectional view of a siphon valve structure according to an embodiment of this application; and

[0027] Figure 12 This is an exploded view of a siphon valve structure according to an embodiment of this application. Detailed Implementation

[0028] 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.

[0029] 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).

[0030] This application proposes an independent siphon valve module that can be configured separately. Users who do not require this function do not need to select it, or it can be installed for short periods of temporary use, offering flexibility and reducing waste. Furthermore, the siphon valve in this application does not use a high-cost custom diaphragm, resulting in lower costs. In addition, the siphon valve in this application is rotatable with other pipeline structures, facilitating connection from different directions.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Figure 3 This is a schematic diagram of a pump tube assembly structure according to an embodiment of this application.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Figure 4 This is a schematic diagram of a pump head structure according to an embodiment of this application. Figure 5 This is a top view of a pump head according to an embodiment of this application. Figures 6A-6E This is a cross-sectional view of a pump head according to an embodiment of this application. Figure 7 This is an exploded view of a pump head according to an embodiment of this application.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] In some embodiments, the base 410 may further include a plurality of oil outlets 417 disposed on the side wall of the base and connected to the flow channel 413, 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 417 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.

[0048] 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.

[0049] 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. 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.

[0050] 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.

[0051] 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 connecting post 423 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 4231 and the electrical passage 4232 to the oil line and electrical line, respectively. In some embodiments, the end of the connecting post 423 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 4231 and the electrical passage 4232, 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 470 can be connected to the electrical passage. In some embodiments, the sidewall of the connecting column may include one or more openings 4233 located between the first end face and the second end face, allowing the oil passage 4231 to communicate with the upper flow passage 4131, 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.

[0052] Combination Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of a valve assembly according to one embodiment of the present application. Figure 9 This is a cross-sectional view of a valve assembly according to an embodiment of this application.

[0053] 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, which 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 and a valve core 433. The valve cover is disposed at the first 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 second end face of the cover body. In some embodiments, the valve cover 431 is sealed to the cover body. In some embodiments, the valve assembly 430 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.

[0054] 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.

[0055] In some embodiments, the valve cover 431 may further include a protrusion 4318 extending outward from the cover plate, disposed outside the valve core receiving channel 4314, 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.

[0056] In some embodiments, the valve core 433 includes a baffle 4331 and a connecting rod 4332. The baffle 4331 can be near or away from the second end face of the cover, 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 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 4331 may include a positioning protrusion 4334, which can be used to fit the sealing gasket 4333 and position the sealing gasket.

[0057] 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.

[0058] In some embodiments, the valve core may further include a guide 4336 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 4336 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 4334 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 may be connected to a protrusion 4318 on the valve cover. In some embodiments, the lifting ring may be integrally formed with the protrusion.

[0063] 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.

[0064] When a gas station needs a submersible pump to draw fuel from other storage tanks, the pump head may also include a siphon valve 460. This valve, mounted on the base, controls the return flow of external fuel to the storage tank. (Reference) Figure 6B In some embodiments, the base may include a return channel 418, which connects to the outside of the pump head, the upper flow channel 4131, and the lower flow channel 4132. This channel can accommodate a siphon valve 460, which can also control the opening and closing of the return channel 418. 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 4131, and the lower flow channel 4132 from each other.

[0065] Combination Figure 10 , Figure 11A , Figure 11B as well as Figure 12 . Figure 10 This is a schematic diagram of a siphon valve structure according to an embodiment of this application. Figure 11A and Figure 11B This is a cross-sectional view of a siphon valve structure according to an embodiment of this application. Figure 12 This is an exploded view of a siphon valve structure according to another embodiment of this application. In some embodiments, the siphon valve 460 may include a valve body 461, a valve cover 462, a valve core 463, and a first check valve 465.

[0066] In some embodiments, the valve body 461 is cylindrical in shape and includes a valve core cavity 4611 inside, which can accommodate a valve core 463. The valve core cavity 4611 extends through the first end of the valve body, and the valve core 463 can be placed in the valve core cavity from the first end of the valve body. In some embodiments, a valve cover 462 is disposed on the first end of the valve body and can close the valve core cavity. In some embodiments, the valve body 461 further includes a first flow channel 4612, connecting the lower end of the valve core cavity 4611 and the second end of the valve body, and connecting the valve core cavity to the lower flow channel 4132. In some embodiments, the first flow channel 4612 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 461 further includes one or more second flow channels 4613, 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 4131. In some embodiments, the valve body 461 further includes an oil inlet 4614, 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.

[0067] In some embodiments, the first check valve 465 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 465 can also secure the valve body in the return flow channel 418.

[0068] In some embodiments, the valve core 463 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 463 may include a third flow channel 4631, 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.

[0069] In some embodiments, the siphon valve may further include a manifold 464 and a second check valve 466, wherein the manifold 464 may be sleeved on the oil inlet of the valve body 461 and can be used to connect to other pipelines. In some embodiments, the manifold 464 may also surround the circumferential space of the valve body and can rotate in the circumferential direction of the valve body 461 to facilitate connection with other pipelines. In some embodiments, the second check valve 466 is disposed 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.

[0070] 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.

[0071] 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 siphon valve for a submersible pump head, characterized in that, include: A valve body is provided with a valve core cavity, an oil inlet, and a first flow channel and a second flow channel connected to the valve core cavity. The axis of the first flow channel coincides with the axis of the valve core cavity. The second flow channel is arranged around the valve body, and its axis is parallel to the axis of the valve core cavity. The oil inlet is located at the intersection of the valve core cavity and the first flow channel. A valve core, disposed within a valve core cavity of the valve body, the valve core including a third flow channel extending through the valve core and connected to the first flow channel and the second flow channel; and A first check valve is located at the outlet of the first flow channel; The oil enters the valve core cavity through the second flow channel, flows into the first flow channel through the third flow channel, and then flows out of the valve body through the first flow channel. The diameter of the first flow channel is larger than the diameter of the third flow channel.

2. The siphon valve for a submersible pump head according to claim 1, characterized in that, The valve core includes a conical surface at the end near the first flow channel.

3. The siphon valve for a submersible pump head according to claim 2, characterized in that, The valve core and the first flow channel include a gap of 1.3-3.8 mm.

4. The siphon valve for a submersible pump head according to claim 1, characterized in that, The diameter of the first flow channel gradually increases from the end closer to the valve core to the end farther away from the valve core.

5. The siphon valve for a submersible pump head according to claim 1, characterized in that, It further includes a manifold fitted onto the oil inlet of the valve body, which includes a vacuum channel inside, connecting the oil inlet to other pipelines.

6. The siphon valve for a submersible pump head according to claim 5, characterized in that, The manifold surrounds the circumferential space of the valve body and can rotate in the circumferential direction of the valve body.

7. The siphon valve for a submersible pump head according to claim 5, characterized in that, It further includes a second check valve disposed in the vacuum channel.

8. The siphon valve for a submersible pump head according to claim 1, characterized in that, The valve body includes an opening that communicates with the valve core cavity for installing the valve core, and a valve cover is provided at the opening to seal the valve core cavity.

9. A pump head for a submersible pump, characterized in that, include: The base includes a riser mounting port, a cover mounting port, a flow passage, a capacitor cavity, and a wiring cavity. The riser mounting port is connected to the oil storage tank, the cover mounting port is opposite to the riser mounting port, and the flow passage connects the riser mounting port and the cover mounting port. The cover includes a first end face, a second end face, and a connecting post. The first end face is disposed on the cover mounting opening of the base to close the base. The second end face extends into the base and divides the flow channel into an upper flow channel and a lower flow channel, the lower flow channel communicating with the oil storage tank. The connecting post connects the first end face and the second end face, and the connecting post includes an oil channel and an electrical channel arranged in parallel. The oil channel and the electrical channel pass through the first end face and the second end face, wherein the oil channel communicates with the upper flow channel. A valve assembly, disposed in the oil passage of the cover, is used to control the flow of oil; as well as Siphon valve for submersible pump head as described in any one of claims 1-8; The base includes a return oil channel, and the siphon valve for the submersible pump head as described in any one of claims 1-8 is disposed in the return oil channel. The first flow channel is connected to the lower flow channel and the first flow channel is connected to the upper flow channel.

10. A submersible pump, characterized in that, Includes the pump head of the submersible pump as described in claim 9.

Images