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

Abstract

The utility model relates to an oil-submerged pump and a pump head for the oil-submerged pump, the pump head for the oil-submerged pump comprises a base, the base comprises a vertical pipe mounting port, a cover body mounting port, an overflowing channel, a capacitor cavity and a wiring cavity, the vertical pipe mounting port is connected to an oil storage tank, and the overflowing channel is communicated with the vertical pipe mounting port and the cover body mounting port; the cover body comprises a first end face, a second end face and a connecting column, the first end face is arranged on the cover body mounting opening of the base, the second end face extends into the base and divides the overflowing channel into an upper overflowing channel and a lower overflowing channel, and the lower overflowing channel is communicated with the oil storage tank; the connecting column is connected between the first end face and the second end face, the connecting column comprises an oil channel and an electrical channel which are arranged in parallel, and the oil channel is communicated with the upper overflowing channel; the valve assembly is arranged in the oil liquid channel of the cover body; the capacitor is arranged in the capacitor cavity of the base; and the junction box is arranged in the wiring cavity of the base. The pump head is compact in structure and light in weight.

Description

Technical Field

[0001] This utility model relates to the field of refueling equipment, and in particular to a submersible pump and a pump head for 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 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] However, the pump head of a submersible pump requires an installation structure connected to the pump pipe, as well as a power supply structure, such as a junction box, capacitor chamber, and explosion-proof connection device, and fluid control functions, such as check valves and siphon valves. This results in a complex liquid flow channel shape within the pump head, with too many bends, leading to low liquid flow efficiency and significant pressure loss. Furthermore, there is excessive interference between the liquid and electrical flow channels, resulting in two trends in current pump head structures: 1. To achieve a compact pump head structure, the cavity shapes of the liquid and electrical flow channels are designed to be complex, leading to increased manufacturing difficulty; 2. The liquid and electrical flow channels are designed to avoid each other, resulting in a larger pump head size and increased overall weight. Therefore, there is an urgent need in this field for a completely new pump head structure. Utility Model Content

[0004] To address the technical problems existing in the prior art, this utility model proposes a pump head for a submersible pump, comprising: a base, which includes a riser mounting port, a cover mounting port, a flow channel, a capacitor cavity, and a wiring cavity; 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 connects 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; 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 communicates with the oil storage tank. The connecting post is connected between the first end face and the second end face. The connecting post includes an oil channel and an electrical channel arranged in parallel, which pass through the first end face and the second end face. The oil channel communicates with the upper flow channel. A valve assembly is disposed in the oil channel of the cover and is used to control the flow of oil. A capacitor is disposed in the capacitor cavity of the base. A junction box is disposed in the junction cavity of the base and is connected to the capacitor. The second end face includes a return valve core, which is connected to the upper flow channel and the lower flow channel and is used to control the return flow of oil from the upper flow channel to the lower flow channel.

[0005] As described above for a submersible pump head, the connecting post extends into the lower flow channel and is connected to the pump pipe.

[0006] As described above, in the pump head for a submersible pump, at least a portion of the connecting post between the first end face and the second end face is hollowed out to increase the flow area between the oil passage and the upper flow passage.

[0007] As described above, the pump head for a submersible pump includes one or more oil outlets on the base, which are disposed on the side wall of the base and communicate with the upper flow channel.

[0008] As described above, the pump head for a submersible pump has a gradually increasing flow area connecting the oil outlet to the upper flow channel.

[0009] As described above, in the pump head for a submersible pump, the direction of the oil outlet is perpendicular or parallel to the direction of the axis of the upper flow channel.

[0010] The pump head for a submersible pump as described above further includes a wire bridge connecting the circuit channel and the capacitor cavity.

[0011] The pump head for a submersible pump, as described above, further includes one or more fasteners for connecting a first end face of the cover to the base and pressing the cover onto the base.

[0012] As described above, in the pump head for a submersible pump, a spring is fitted on the fastener, located between the first end face of the cover and the base. When the fastener loosens, the spring pushes the cover away from the base.

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

[0014] The liquid flow channel and electrical channel of the submersible pump head of this application are arranged separately so that they do not interfere with each other. The structure is simple, compact, and lightweight. It can also increase the liquid flow area, reduce flow pressure loss, and facilitate assembly and maintenance. Attached Figure Description

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

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

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

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

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

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

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

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

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

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

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

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

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

[0028] Figure 13 A schematic diagram of a valve assembly according to an embodiment of this application; and

[0029] Figure 14 This is a cross-sectional view of a valve assembly according to an embodiment of this application. Detailed Implementation

[0030] 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.

[0031] 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).

[0032] This application proposes a novel submersible pump head structure. The shape of the internal liquid and electrical flow channels is optimized, with the liquid and electrical channels arranged separately to prevent interference. The structure is simple, compact, and lightweight, while also increasing the liquid flow area and minimizing flow losses. Assembly and maintenance are easier, and valve assembly is also facilitated. Oil exiting the pump pipe can pass through the valve assembly without excessive detours, resulting in low flow resistance and good sealing. Furthermore, the pump head of this application integrates the junction box, capacitors, and other electrical components onto the pump head base, reducing the labor intensity of lifting operations when removing the submersible pump from the tank.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Figure 3 This is a schematic diagram of a pump tube assembly structure according to an embodiment of this application.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Combination Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of an adjustment device according to an embodiment of the present application. Figure 5 This is an exploded view of an adjustment device according to an embodiment of this application.

[0044] According to one embodiment of this application, the first holding member may include: a first clamp 341, a second clamp 342, and a first fastener 343. The first clamp 341 and the second clamp 342 can be clamped to one end of the second section of the oil pipe, and the first fastener 343 fastens the first clamp and the second clamp. The second holding member may include: a third clamp 344, a fourth clamp 345, and a second fastener 346. The third clamp 344 and the fourth clamp 345 can be clamped to the first section of the oil pipe, and the second fastener 346 fastens the third clamp 344 and the fourth clamp 345. The connecting member may be a first connecting piece 347 and a second connecting piece 348, which are connected between the first fastener and the second fastener. When the third clamp 344 and the fourth clamp 345 are clamped to the first section of the oil pipe, the first section of the oil pipe and the second section of the oil pipe are locked and cannot extend or retract. When the third clamp 344 and the fourth clamp 345 are not tightly fastened to the first section of the oil passage, the first section of the oil passage can extend and retract axially along the second section of the oil passage. In some embodiments, the first and second fasteners can be screws, such as screws with an M6 or M8 specification.

[0045] In some embodiments, when the first clamp 341 and the second clamp 342 can be clamped to one end of the second section of the oil pipe, and the third clamp 344 and the fourth clamp 345 can be clamped to the first section of the oil pipe, a certain gap is included between the first clamp and the second clamp, and between the third clamp and the fourth clamp, to ensure that they are clamped to the oil pipe. In some embodiments, the first connecting piece 347 and the second connecting piece 348 are disposed in the gap between the first clamp and the second clamp, and between the third clamp and the fourth clamp, and do not contact the first clamp, the second clamp, or the third clamp and the fourth clamp, to prevent failure to clamp the oil pipe.

[0046] In some embodiments, the end of the second oil passage pipe connected to the regulating device may further include a connecting portion for connecting with the first clamp 341 and the second clamp 342. In some embodiments, the connecting portion may include threads, thereby increasing the friction between the second oil passage pipe and the regulating device and increasing the connection strength. Correspondingly, the inner surfaces of the first clamp 341 and / or the second clamp 342 may also include threads.

[0047] In some embodiments, the circuit tube receiving portion may include a recess 349 extending outward from the first clamp 341 and / or the third clamp 344, and the second section of the circuit tube may be accommodated in the recess 349 to prevent the circuit tube from shifting during the extension and retraction process.

[0048] The adjusting device of this application requires only a few sets of fasteners to secure the two clamping parts into a locked state. The fastening operation is simple, easy, and labor-saving. The adjusting device, with its outwardly extending recess, allows other pipelines, such as the conduit for a submersible motor, to pass through, thus creating flow space inside the oil pipe. Furthermore, the adjusting device of this application can be easily assembled and disassembled on the pump pipe, and in case of component damage, it can be replaced on-site at the gas station, making its use and maintenance flexible.

[0049] Combination Figure 6 , Figure 7A and Figure 7B by Figure 8A and Figure 8B . Figure 6 This is a schematic diagram of a motor connector according to an embodiment of this application. Figure 7A and Figure 7B This is a schematic diagram of the two end face structures of a motor connector according to an embodiment of this application. Figure 8A and Figure 8B This is a cross-sectional view of a motor connector according to an embodiment of this application.

[0050] In some embodiments, the motor connector 330 includes a housing 331, which has multiple oil passages 332 and electrical passages 333 internally. (See reference) Figure 7AAt one end of the motor connector 330, which connects to the oil pipe 310 and the electrical pipe 320, multiple oil passages converge at one point and are arranged parallel to and spaced apart from the electrical passage 333, thus allowing connection to the parallel oil pipe 310 and the electrical pipe 320; Reference Figure 7B The motor connector 330 is connected to the submersible motor at one end, with the circuit channel 333 located at the center and the oil passage 332 arranged around the circuit channel 333, so that it can be connected to the submersible motor. In some embodiments, the connection between the oil passage and the oil pipe, and the connection between the circuit channel and the circuit pipe, both include connecting threads.

[0051] In some embodiments, the cable plug can be inserted into the submersible motor through the circuit channel 333. The circuit channel 333 may also include a plug positioning groove 3331, which can accommodate and position the cable plug, so that when the motor connector is connected to the submersible motor, the cable plug can be inserted into the submersible motor to supply power to the submersible motor. In some embodiments, the circuit channel 333 may also include a sealing groove 3332, which can be used to accommodate a sealing ring to prevent oil from entering the circuit pipe 320 through the circuit channel 333 or affecting the connection between the cable plug and the submersible motor.

[0052] In some embodiments, the base 331 may be cast, and its outer dimensions gradually taper from the end connected to the submersible motor to the end connected to the pump pipe. In some embodiments, the outer periphery of the base may also include multiple reinforcing ribs 3311, which are connected to both ends of the base 331 to increase the structural strength of the base. In some embodiments, one of the reinforcing ribs is provided with an oblique channel 3333, which is part of the circuit channel, and can move the circuit channel from the center of the end connected to the submersible motor to the end connected to the pump pipe, where it is arranged parallel to the oil passage. In some embodiments, multiple reinforcing ribs 3311 may also be spaced apart from multiple oil passages, or in other words, multiple reinforcing ribs can divide the oil passage into multiple channels, where each oil passage corresponds to the oil outlet channel of the submersible motor.

[0053] In some embodiments, the end of the base 331 connected to the submersible motor may further include an outer edge 3312, which may extend outward along the plane perpendicular to the outer surface of the base. The outer edge 3312 may include a connecting portion for connecting the motor connector to the submersible motor. In some embodiments, the connecting portion may include one or more connecting holes 3313, which may be evenly spaced along the circumference of the outer edge to accommodate fasteners (e.g., bolts) passing through, connecting the motor connector to the submersible motor. In some embodiments, the outer edge may also include a limiting portion, such as a positioning pin hole 3314, which may be used for circumferential positioning of the motor connector and the submersible motor, aligning the flow channels of the motor connector and the submersible motor, and aligning the cable plug and the submersible motor terminal block located in the circuit channel. In some embodiments, the base may be made of metal, such as ASTM A356 or HT200.

[0054] The pump tube assembly of this application can serve as a connector between the submersible pump head and the submersible motor, with one end mounted on the pump head and the other end connected to the submersible motor. The interface size of the motor connector for the submersible motor is consistent with existing products, and existing submersible motors can be used with the pump tube assembly of this application. Furthermore, the pump tube assembly of this application separates the electrical conduit and the oil conduit, allowing for a relatively simple design of the pump head structure. This application further optimizes the structure of the pump head.

[0055] Figure 9 This is a schematic diagram of a pump head according to an embodiment of the present application. Figure 10 This is a top view of a pump head according to an embodiment of this application. Figures 11A-11D This is a cross-sectional view of a pump head according to an embodiment of this application. Figure 12 This is an exploded view of a pump head according to an embodiment of this application.

[0056] 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.

[0057] 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 connects the base to the riser of the oil storage tank; the cover mounting port 912 connects to the cover 920; the flow passage 913 is located between the riser mounting port 912 and the cover mounting port 913, and communicates with both; the capacitor cavity 914 and the wiring cavity 915 are located on one side of the base and are parallel to the axis of the flow passage 913.

[0058] 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.

[0059] 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.

[0060] In some embodiments, the base 910 may further include an oil outlet 917, which is disposed on the side wall of the base and communicates with the flow channel 913. This outlet can be connected to the fuel dispenser's pipeline to output oil. In some embodiments, the direction of the oil outlet is parallel to the axial direction of the flow channel, thereby increasing the diameter of the oil outlet. In some embodiments, the direction of the outlet may also be perpendicular to the axial direction of the flow channel. In some embodiments, the base 910 may further include multiple oil outlets, which may be spaced apart along the circumference of the base. In some embodiments, the portion of the oil outlet connected to the flow channel fully utilizes the projected area of ​​the oil outlet side of the pump head base, using a nearly rectangular area laterally, gradually transitioning towards the oil outlet, and during the transition, the oil flow direction changes from radial to axial. This can sufficiently expand the oil flow area, reduce flow resistance, and also reduce the spatial dimensions of the pump head base, making it compact.

[0061] 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.

[0062] In some embodiments, the shape of the first end face 921 is the same as that of the cover mounting opening on the base and is located within the cover mounting opening. A bolt can be used to press the first end face onto the cover mounting opening, thereby sealing the base. In some embodiments, an elastic element, such as a spring, can also be provided on the bolt. When the first end face 921 is pressed against the cover mounting opening, the spring on the bolt is compressed; when the cover needs to be removed, the bolt is loosened, and the spring pushes the first end face of the cover out of the mounting position, facilitating disassembly and assembly. In some embodiments, the side of the first end face 921 that contacts the cover mounting opening includes a sealing groove (not shown in the figure), which can be used to accommodate a sealing ring for a sealing connection between the cover and the base.

[0063] 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.

[0064] In some embodiments, the connecting post 923 may further include an oil passage 9231 and an electrical passage 9232 arranged in parallel, which can be connected to the oil line and electrical line of the pump pipe, respectively. In some embodiments, the oil passage and the electrical passage run through the entire connecting post and extend beyond the first end face, and the cable bridge 970 can be connected to the electrical passage. In some embodiments, the sidewall of the connecting post may include one or more openings 9233 located between the first end face and the second end face, which can connect the oil passage 9231 to the upper flow passage 9131, so that oil can enter the upper flow passage through the oil passage and be output from the oil outlet. In some embodiments, at least a portion of the sidewall of the connecting post between the first end face and the second end face may be hollow, which can increase the channel area for oil to flow into the upper flow passage and reduce flow resistance. In some embodiments, the connecting post 923 may also extend beyond the second end face away from the first end face, and can be connected to the pump pipe. In some embodiments, the end of the connecting post 923 extending beyond the second end face may include a connecting portion, which can be used to connect to the pump pipe. In some embodiments, the connection may include threads that may be provided on the inner walls of the oil passage 9231 and the electrical passage 9232, and may be threaded to the oil pipe and the electrical pipe, respectively.

[0065] Combination Figure 13 and Figure 14 , Figure 13 This is a schematic diagram of a valve assembly according to one embodiment of the present application. Figure 14 This is a cross-sectional view of a valve assembly according to an embodiment of this application.

[0066] In some embodiments, the valve assembly 930 can enter the oil passage of the cover body from the first end face of the cover body and is disposed in the oil passage of the cover body. It can be used to allow or prevent oil from passing through the oil passage 9231. In some embodiments, the valve assembly 930 includes: a valve cover 931, a valve seat 932, and a valve core 933. The valve cover is disposed at the first end face of the cover body, the valve seat 932 is disposed at the second end face of the cover body, and one end of the valve core 933 extends into the valve cover 931, and the other end abuts against the valve seat 932. In some embodiments, the valve cover 931 and the valve seat 932 are sealed to the cover body. In some embodiments, when the gas station needs a submersible pump to draw oil from other oil storage tanks, the valve assembly 930 may also include a vacuum channel 934, which is connected between the valve cover 931 and the valve seat 932 and extends to the valve cover 931 and the valve seat 932, so as to draw oil from other oil storage tanks into the submersible pump.

[0067] 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.

[0068] In some embodiments, the valve cover 931 includes at least a partial vacuum channel 9341, the axis of which is parallel to the axis of the valve cover and extends outward in the direction extending from the cover plate to the side plate. In some embodiments, the vacuum channel 9341 may also include a mounting hole 9315 that mates with other partial vacuum channels. This mounting hole is a stepped hole, wherein the diameter gradually increases in the direction extending from the vacuum channel 9341, and a stepped surface is formed between the different diameters. This stepped surface can be used for axial positioning when installing with other partial vacuum channels. In some embodiments, the larger diameter portion of the mounting hole 9315 sequentially includes a sealing groove 9316 and a retaining ring groove 9317. The sealing groove can be used to install a sealing ring to seal the installation between different partial vacuum channels, and the retaining ring groove can be used to fix the connection between different partial vacuum channels.

[0069] In some embodiments, the valve cover 931 may further include protrusions 9318 and 9319 extending outward from the cover plate, respectively disposed outside the valve core receiving channel 9314 and the vacuum channel 9341, and extending in a direction opposite to the extending direction of the side plate. In some embodiments, the inner wall of the protrusions may include threads, which can be used to connect other structures. In some embodiments, the protrusions 9318 and 9319 may be interconnected, and their outer contours are similar to a figure "8", which can be used as the force application position for tightening the tooling when the valve cover is installed onto the cover body.

[0070] In some embodiments, the valve seat 932 is an integral annular structure. One end of the valve seat 932 may have a diameter slightly smaller than the other end, resulting in a conical surface on the outer side of the valve seat 932, facilitating guidance into the oil passage of the cover during installation. In some embodiments, the valve port 9321 where the valve seat 932 contacts the valve core is a stepped port, and the ridge position 9322 where the valve core contacts the stepped port is designed as a conical surface for mating with the valve core. In some embodiments, the apex angle of the conical surface is 50°-70°. In some embodiments, the valve seat 932 also has a partial vacuum channel 9342, which extends from the side of the valve seat 932 and along the axial direction of the valve seat, inserting into the mounting hole 9315 of the valve cover, and can be connected to the vacuum tube channel 9341, thereby connecting the valve seat and the valve cover.

[0071] In some embodiments, the valve core 933 includes a baffle 9331 and a connecting rod 9332. The baffle 9331 can be located near or away from the valve port 9321 of the valve seat 932, thereby closing or opening the oil passage. The connecting rod 9332 is disposed on the baffle and extends outward from it, extending into the valve core receiving channel 9314 of the valve cover, and can move within the valve core receiving channel. In some embodiments, the valve core 933 may further include a sealing gasket 9333, which can be disposed on the baffle and face the valve seat. When the baffle approaches the valve port 9321, the sealing gasket can be pressed against the valve port, completely closing the oil passage and preventing oil from passing through. In some embodiments, the baffle 9331 may include a positioning protrusion 9334, which can be used to fit the sealing gasket 9333 and position the sealing gasket.

[0072] 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.

[0073] In some embodiments, the valve core may further include a guide cone 9336, disposed on the side of the baffle away from the connecting rod. This guide cone, when pushed open by oil, creates a vacuum in the oil passage between its outer surface and the valve seat due to the Venturi effect, thus functioning as a siphon valve. In some embodiments, the outer surface of the guide cone is a conical surface, with a cone apex angle ranging from 50° to 70°. In some embodiments, the guide cone 9336 may include a through-hole extending along the connecting rod axis. This through-hole may be a stepped hole, used for mounting the guide cone onto the baffle. For example, the guide cone can be mounted onto the baffle by installing this through-hole onto a positioning protrusion 9334 and securing it to the protrusion with a retaining ring. In some embodiments, mounting the guide cone onto the positioning protrusion can also cooperate with the baffle to clamp the sealing gasket, preventing it from moving under oil immersion and affecting control of the oil passage.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] In some embodiments, the valve assembly 930 may further include a one-way valve 936, which may be disposed in the vacuum channel to allow only unidirectional flow in the vacuum channel, preventing oil from flowing out of the submersible pump from the vacuum tube channel. In some embodiments, the one-way valve 936 includes a valve body 9361 and an inner core 9362. The valve body 9361 is disposed on the protrusion 9319 of the valve cover, and the inner core 9362 is movable within the valve body. In some embodiments, the one-way valve 936 may further include a plug 9363, which may be disposed on the valve body to seal the vacuum channel; the plug can be removed when the vacuum channel is needed.

[0078] In some embodiments, the valve assembly 930 may further include a lifting ring 937, which may be disposed on the valve cover and serve as a lifting point for the installation and maintenance of the entire pump. In some embodiments, the lifting ring 937 can be connected to the valve cover via a lifting ring head. The first end of the lifting ring head includes a threaded blind hole for connecting a lifting ring; the second end of the lifting ring head includes an external thread for connecting to the protrusion 9318 of the valve cover. In some embodiments, the second end of the lifting ring head may also include a blind hole that communicates with the valve core receiving channel 9314, accommodating a portion of the valve core, thereby reducing the height of the valve cover, which helps to reduce the volume of the valve cover and lower costs.

[0079] 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.

[0080] During the refueling process of the submersible pump, the venturi effect occurs between the guide cone of the valve core and the valve port of the valve seat, resulting in a localized decrease in liquid pressure and the creation of a vacuum. When the gas station needs the submersible pump to draw oil from other storage tanks using the siphon effect generated by the vacuum, the seal of the one-way valve in the vacuum channel can be removed, and the oil extraction pipeline can be connected. The oil flows through the guide cone of the valve core, and the created vacuum can be used to draw external liquid into the pump head. When external liquid is drawn into the pump head, the refueling machine does not refuel externally. The pump head may also include a return valve core 960. It is located on the second end face of the valve cover and can control the return flow of external liquid back into the storage tank. In some embodiments, the second end face may include a return channel 9221, which can be used to accommodate the return valve core, and the return valve core can be controlled to open or close.

[0081] refer to Figure 11D In some embodiments, the return valve core 960 includes a return valve stem 961, a retaining ring 962, and a spring 963. The first end of the return valve stem 961 is located on the side of the second end face of the cover away from the first end face, and the second end of the return valve stem 961 extends through the second end face and toward the first end face. The retaining ring 962 is disposed on the second end of the return valve stem. The spring 963 is sleeved on the return valve stem, with one end abutting against the retaining ring and the other end abutting against the second end face. In some embodiments, the first end of the return valve stem 961 may include a sealing ring, and the first end of the return valve stem may be pressed against or away from the second end face. When the submersible pump needs to draw liquid from other containers into the storage tank, the corresponding refueling nozzle of the submersible pump can be lifted from the refueling machine without refueling, triggering the submersible pump start signal, keeping the submersible pump motor running but not supplying oil externally. At this point, the oil pressure inside the submersible pump is at its highest performance curve. The first end of the return valve stem is pushed away from the second end face by the oil pressure, opening the return channel 9221. Oil is then released into the storage tank through the riser pipe connected to the pump head base, forming an internal circulation state. The spring is in a compressed state. After the liquid is pumped out, the first end of the return valve stem can be pressed against the second end face under the force of the spring, closing the return channel. In some embodiments, the opening pressure of the return valve core is higher than the opening pressure of the pressure regulating valve stem.

[0082] In some embodiments, the first end of the return valve stem 961 may include an outwardly protruding boss 9611, which facilitates the return valve stem being pressed against the second end face. In some embodiments, the diameters of the first and second ends of the return valve stem 961 are larger than the diameter of the middle portion. In other words, the removal of some material from the middle portion of the return valve stem ensures that the return valve stem is centrally positioned in the return channel, which is beneficial for sealing in the closed state and for guiding during movement; it also helps to increase the area of ​​the oil return cross-section and accelerate the return speed when the oil is in a return flow state.

[0083] 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.

[0084] 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 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; A capacitor is disposed in the capacitor cavity of the base; as well as A junction box, which is disposed in the wiring cavity of the base and connected to the capacitor; The second end face includes a return valve core, which is connected to the upper flow channel and the lower flow channel, and is used to control the oil to flow back from the upper flow channel to the lower flow channel.

2. The pump head for a submersible pump according to claim 1, characterized in that, The connecting post extends into the lower flow channel and is connected to the pump pipe.

3. The pump head for a submersible pump according to claim 1, characterized in that, At least a portion of the connecting post between the first end face and the second end face is hollowed out to increase the flow area between the oil channel and the upper flow channel.

4. The pump head for a submersible pump according to claim 1, characterized in that, The base includes one or more oil outlets, which are located on the side wall of the base and connected to the upper flow channel.

5. The pump head for a submersible pump according to claim 4, characterized in that, The flow area connecting the oil outlet to the upper flow channel gradually increases.

6. The pump head for a submersible pump according to claim 4, characterized in that, The direction of the oil outlet is perpendicular or parallel to the direction of the axis of the upper flow channel.

7. The pump head for a submersible pump according to claim 1, characterized in that, Further includes: A line bridge connects the circuit channel and the capacitor cavity.

8. The pump head for a submersible pump according to claim 1, characterized in that, It further includes one or more fasteners for connecting the first end face of the cover to the base and pressing the cover onto the base.

9. The pump head for a submersible pump according to claim 8, characterized in that, A spring is fitted onto the fastener, located between the first end face of the cover and the base. When the fastener loosens, the spring pushes the cover away from the base.

10. A submersible pump, characterized in that, Includes the pump head for a submersible pump as described in any one of claims 1-9.

Images