An oil outlet valve assembly with a dual-valve core coupling structure

Abstract

This invention relates to an oil outlet valve assembly with a dual-valve-core coupling structure, comprising: an oil outlet valve seat and a valve core channel. One end of the valve core channel corresponds to the oil outlet valve seat, and the other end is connected to an external interface. The valve core channel contains a lower inner valve core, an upper inner valve core, and an elastic element compressed and supported between the upper and lower inner valve cores. The elastic element maintains the upper and lower inner valve cores in a sealed state. An oil outlet flow channel is arranged in parallel with the valve core channel. When the oil pressure on the oil outlet valve seat side is greater than the elastic support force of the elastic element, the lower inner valve core releases its seal, and the oil flow channel connects the oil outlet valve seat and the external interface. When the oil pressure on the external interface side is greater than the elastic support force of the elastic element, the upper inner valve core releases its seal, and the valve core channel, together with the upper and lower inner valve cores, forms a pressure relief channel connecting the external interface and the oil outlet valve seat. This invention, through the combined coupling of the upper and lower inner valve cores, enables the oil outlet valve assembly to quickly open and dispense oil, and also meets the need for pressure relief in non-operating states.

Description

Technical Field

[0001] This invention relates to the field of power machinery technology, specifically to an oil outlet valve assembly with a dual-valve-core coupling structure, suitable for fuel injection in marine high-power mechanical medium-speed fuel engines. Background Technology

[0002] Marine main engines are characterized by high flow rates and harsh operating environments for mechanical fuel pumps. High-power marine engines require fuel injectors that inject large quantities of fuel, resulting in significant fuel pressure fluctuations and substantial impact on the valve core, making it prone to damage. As a compressible liquid, fuel in a high-pressure injection system is injected into the high-pressure fuel line the instant the delivery valve opens. The fuel near the delivery valve in the high-pressure fuel line is compressed, increasing its pressure. This pressure wave, layered and gradually increasing in amplitude, is formed. In medium-speed fuel engines, the injection duration is longer, leading to a longer propagation time for the pressure wave and more complex pressure wave superposition, ultimately resulting in large fuel pressure fluctuations.

[0003] Therefore, the requirements for the fuel pump's delivery valve assembly structure are relatively high: it must meet the requirements of the large injection volume of the marine main engine, as well as the high reliability of the delivery valve assembly. Designing a delivery valve assembly that meets the requirements of large flow, good pressure holding effect, and high reliability is particularly important. Summary of the Invention

[0004] To achieve the above-mentioned technical objectives, the present invention provides an oil outlet valve assembly with a dual-valve-core coupling structure. Through the dual-valve-core coupling structure, the oil outlet valve assembly can be opened quickly and a certain pressure holding capacity can also be achieved.

[0005] The technical objective of this invention is achieved through the following technical solution: An oil outlet valve assembly with a dual-valve-core coupling structure includes the following components disposed within the oil outlet valve housing: The fuel outlet valve seat is used to connect to the booster chamber to realize fuel output and pressure relief return; The valve core channel has one end corresponding to the oil outlet valve seat and the other end connected to an external interface for fuel output and pressure relief return. The valve core channel is equipped with a lower inner valve core for blocking the oil outlet valve seat, an upper inner valve core for blocking the connection between the valve core channel and the external interface, and an elastic element that is compressed and supported between the upper inner valve core and the lower inner valve core. The elastic element is used to maintain the blocked state of the upper inner valve core and the lower inner valve core. The oil outlet passage is configured in parallel with the valve core passage to supply fuel from the oil outlet valve seat to the external interface; When the oil pressure on the outlet valve seat side is greater than the elastic support force of the elastic element, the lower inner valve core releases the blockage on the outlet valve seat and the oil outlet flow channel connects the outlet valve seat and the external interface. When the oil pressure on the external interface side is greater than the elastic support force of the elastic element, the upper inner valve core moves closer to the lower inner valve core and releases the blockage at the connection between the valve core channel and the external interface. The valve core channel, together with the upper inner valve core and the lower inner valve core, forms a pressure relief channel connecting the external interface and the oil outlet valve seat.

[0006] Furthermore, the upper inner valve core includes an upper sealing end, a cylindrical plug, and a tail column arranged coaxially in sequence. The upper sealing end is used to seal the connection between the valve core channel and the external interface. The cylindrical plug has an outer diameter that matches the inner diameter of the valve core channel. The outer diameter of the tail column is smaller than the outer diameter of the cylindrical plug and provides compression guidance when the elastic element is elastically compressed. The upper sealing end has a tapered surface that matches the shape of the connection between the valve core channel and the external interface.

[0007] Furthermore, the lower inner valve core includes a lower sealing end and a plunger body. The lower sealing end is located at one end of the plunger body, and the other end of the plunger body abuts against the elastic element. The lower sealing end is used to block the oil outlet valve seat. The outer diameter of the plunger body and the inner diameter of the valve core channel are adapted to each other. The lower sealing end has a tapered surface adapted to the shape of the oil outlet valve seat.

[0008] Furthermore, the side of the cylindrical plug is provided with at least one concave pressure relief groove, and the two ends of the pressure relief groove penetrate through the two ends of the cylindrical plug in the axial direction; the lower inner valve core is provided with a central through hole in the axial direction of the lower inner valve core.

[0009] Furthermore, the sidewall of the plunger body is provided with at least one flat surface, and a concave structure connecting the central through hole is provided at the flat surface.

[0010] Furthermore, the outer diameter of the lower sealing end is larger than the inner diameter of the valve core channel, and the lower sealing end forms a limit outside the port of the valve core channel.

[0011] Furthermore, the oil outlet valve seat has a first cavity, a second cavity, and a valve seat channel connecting the first cavity and the second cavity. The first cavity is connected to the booster cavity, and the second cavity is connected to both the oil outlet channel and the valve core channel. The inner diameter of the first cavity and the second cavity is larger than the inner diameter of the valve seat channel. The lower sealing end is placed in the second cavity, and the valve seat channel is positioned to connect to the second cavity with a tapered surface that matches the lower sealing end.

[0012] Furthermore, the external interface includes a first interface cavity and a second interface cavity connected to each other. The inner diameter of the first interface cavity is larger than the inner diameter of the second interface cavity, and the second interface cavity is connected to the valve core channel. A tapered transition cavity is provided at the connection between the first interface cavity and the second interface cavity. The inner diameter of the first interface cavity is smaller than the inner diameter of the valve core channel, and a tapered surface adapted to the shape of the upper sealing end is provided at the connection between the second interface cavity and the valve core channel.

[0013] Furthermore, one end of the oil outlet channel is connected to the second cavity, and the other end of the oil outlet channel is connected to the external interface through the side wall of the first interface cavity; the inner diameter of the oil outlet channel is equal to the inner diameter of the second interface cavity.

[0014] Furthermore, four concave pressure relief grooves are evenly arranged around the side of the plunger, and four planes are evenly arranged around the side wall of the plunger body.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The fuel outlet valve assembly with dual valve core coupling structure of the present invention can realize the rapid opening of the fuel outlet valve assembly to deliver fuel through the combination and coupling of the upper inner valve core and the lower inner valve core. It can also meet the need for pressure relief when the fuel pump enters the non-working state. After the pressure relief reaches a certain level, it can automatically close the pressure relief to achieve a certain pressure holding effect, ensuring that a certain oil pressure is maintained on both sides at the same time, avoiding damage to the valve core caused by the instantaneous impact pressure. The structure design has high reliability and high safety redundancy.

[0016] 2. The upper inner valve core and the lower inner valve core of the present invention share a valve core channel for operation, which occupies little space and makes the structure more streamlined without reducing the function of the oil outlet valve assembly.

[0017] 3. The oil outlet valve assembly of the dual valve core coupling structure of the present invention adopts a modular design, and all components are installed in the oil outlet valve housing, which facilitates overall installation and disassembly and has a wide range of applications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the oil outlet valve assembly structure of the dual valve core coupling structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the oil outlet valve seat structure in this invention.

[0020] Figure 3 This is a schematic diagram of the upper inner valve core structure in this invention.

[0021] Figure 4 This is a top view of the upper inner valve core structure in this invention.

[0022] Figure 5 This is a bottom view schematic diagram of the lower inner valve core in this invention.

[0023] Figure 6 This is the present invention. Figure 5 AA cross-sectional view of the lower inner valve core.

[0024] Figure 7 This is a schematic diagram of the external interface structure in this invention.

[0025] Figure 8 This is a schematic diagram of the fuel flow path in the oil outlet state of this invention.

[0026] Figure 9 This is a schematic diagram of the fuel flow path under depressurization conditions in this invention.

[0027] In the picture: 1. Outlet valve housing; 2. Outlet valve seat; 3. Valve core passage; 4. External interface; 5. Lower inner valve core; 6. Upper inner valve core; 7. Elastic element; 8. Outlet flow channel; 201. First cavity; 202. Second cavity; 203. Valve seat passage; 501. Lower sealing end; 502. Plunger body; 503. Central through hole; 504. Plane; 601. Upper sealing end; 602. Cylindrical plug; 603. Tail column; 604. Pressure relief groove. Detailed Implementation

[0028] The technical solution of the present invention will be further described below with reference to specific embodiments: An oil outlet valve assembly with a dual-valve-core coupling structure, such as Figures 1 to 9 As shown, the following is provided inside the oil outlet valve housing 1: The fuel outlet valve seat 2 is used to connect to the booster chamber to realize fuel output and pressure relief return; The valve core channel 3 has one end corresponding to the oil outlet valve seat 2 and the other end connected to an external interface 4 for fuel output and pressure relief return. The valve core channel 3 is provided with a lower inner valve core 5 for blocking the oil outlet valve seat 2, an upper inner valve core 6 for blocking the connection between the valve core channel 3 and the external interface 4, and an elastic element 7 that is compressed and supported between the upper inner valve core 6 and the lower inner valve core 5. The elastic element 7 is used to maintain the blocking state of the upper inner valve core 6 and the lower inner valve core 5. The oil outlet passage 8 is arranged in parallel with the valve core passage 3 to supply fuel from the oil outlet valve seat 2 to the external interface 4. When the oil pressure on the side where the oil outlet valve seat 2 is located is greater than the elastic support force of the elastic element 7, the oil pressure pushes the lower inner valve core to further compress the elastic element 7, the lower inner valve core 5 releases the blockage of the oil outlet valve seat 2 and the oil outlet flow channel 8 connects the oil outlet valve seat 2 and the external interface 4. When the oil pressure on the side where the external interface 4 is located is greater than the elastic support force of the elastic element 7, the oil pressure pushes the upper inner valve core 6 to further compress the elastic element 7. The upper inner valve core 6 moves closer to the lower inner valve core 5 and releases the blockage at the connection between the valve core channel 3 and the external interface 4. The valve core channel 3, together with the upper inner valve core 6 and the lower inner valve core 5, forms a pressure relief channel connecting the external interface 4 and the oil outlet valve seat 2. When the oil pressure on the side where the oil outlet valve seat 2 is located, the elastic support force of the elastic element 7, and the oil pressure on the side where the external interface 4 is located are balanced, the upper inner valve core 6 and the lower inner valve core 5 remain in a blocked state.

[0029] More specifically, such as Figure 2 As shown, the oil outlet valve seat 2 is disposed inside the oil outlet valve housing 1 and near one end of the oil outlet valve housing 1. An O-ring seal is provided between the oil outlet valve seat 2 and the oil outlet valve housing 1. The oil outlet valve seat 2 has a first cavity 201, a second cavity 202, and a valve seat channel 203 connecting the first cavity 201 and the second cavity 202. The first cavity 201 is connected to the booster chamber, and the second cavity 202 is connected to both the oil outlet channel 8 and the valve core channel 3. The inner diameter of the first cavity 201 and the second cavity 202 is larger than the inner diameter of the valve seat channel 203. In one implementation, the first cavity 201 and the second cavity 202 have the same inner diameter.

[0030] like Figure 3 and Figure 4 As shown, the upper inner valve core 6 includes an upper sealing end 601, a cylindrical plug 602, and a tail column 603 arranged coaxially in sequence. The upper sealing end 601 is used to seal the connection between the valve core channel 3 and the external interface 4. The cylindrical plug 602 has an outer diameter that matches the inner diameter of the valve core channel 3. The outer diameter of the tail column 603 is smaller than the outer diameter of the cylindrical plug 602 and provides compression guidance when the elastic element 7 is elastically compressed. For example, the elastic element is a spring, the tail column 603 is inserted into the spring coil, the outer diameter of the cylindrical plug 602 is larger than the outer diameter of the spring coil, and the spring is always linearly compressed along the tail column 603 during the compression process.

[0031] like Figure 5 and Figure 6 As shown, the lower inner valve core 5 includes a lower sealing end 501 and a plunger body 502. The lower sealing end 501 is located at one end of the plunger body 502, and the other end of the plunger body 502 abuts against the elastic element 7. The lower sealing end 501 is used to block the oil outlet valve seat 2, specifically blocking the connection between the second cavity 202 and the valve seat channel 203. The outer diameter of the plunger body 502 is adapted to the inner diameter of the valve core channel 3.

[0032] At least one concave pressure relief groove 604 is provided on the side of the cylindrical plug 602, and the two ends of the pressure relief groove 604 penetrate through the two ends of the cylindrical plug 602 in the axial direction; the lower inner valve core 5 is provided with a central through hole 503 that penetrates through the axial direction of the lower inner valve core 5.

[0033] Preferably, the sidewall of the plunger body 502 is provided with at least one plane 504, and the plane 504 is provided with a concave structure that connects to the central through hole 503.

[0034] In one implementation process, four concave pressure relief grooves 604 are evenly arranged around the side of the plunger 602, and four planes 504 are evenly arranged around the side wall of the plunger body 502. Each plane 504 is provided with a concave structure connected to the central through hole 503. The concave structure is a through hole structure.

[0035] When the oil pressure on the side where the outlet valve seat 2 is located is greater than the elastic support force of the elastic element 7, the oil pressure pushes the lower inner valve core 5 to further compress the elastic element 7. The lower inner valve core 5 releases the blockage on the outlet valve seat 2, and the oil outlet channel 8 connects the outlet valve seat 2 and the external interface 4. After entering from the outlet valve seat, the fuel flows through the oil outlet channel 8 to the external interface 4. The fuel path is as follows: Figure 8 As shown.

[0036] When the oil pressure on the side where external interface 4 is located is greater than the elastic support force of elastic element 7, the fuel depressurization path is as follows: Figure 9 As shown, the upper inner valve core 6 approaches the lower inner valve core 5 and further compresses the elastic element 7. At this time, the external interface 4 and the valve core channel 3 are connected. The external interface, the valve core channel 3, the pressure relief groove 604, the central through hole 503 of the lower inner valve core 5, the valve seat channel 203, and the first cavity 201 are connected to form a pressure relief channel, so that part of the oil pressure on the side where the external interface 4 is located is relieved and returned through the pressure relief channel. When the pressure is relieved to a certain extent, that is, when the oil pressure on the side where the external interface 4 is located gradually approaches and equals the elastic support force of the elastic element 7, the upper inner valve core 6 gradually resets under the action of the elastic support force of the elastic element 7, cutting off the connection between the external interface 4 and the valve core channel 3, and the pressure relief ends. At this time, a certain amount of oil pressure is still retained on the side where the external interface 4 is located, achieving a certain pressure holding purpose. When the side wall of the plunger body 502 is provided with a plane 504, and the plane 504 is provided with a concave structure that connects to the central through hole 503, part of the pressure relief backflow directly enters the central through hole 503, and another part of the pressure relief backflow enters the central through hole 503 from the concave structure.

[0037] like Figure 7 As shown, the external interface 4 includes a first interface cavity 401 and a second interface cavity 402 connected to each other. The inner diameter of the first interface cavity 401 is larger than the inner diameter of the second interface cavity 402. The second interface cavity 402 is connected to the valve core channel 3. A tapered transition cavity is provided at the connection between the first interface cavity 401 and the second interface cavity 402. The inner diameter of the first interface cavity 401 is smaller than the inner diameter of the valve core channel 3.

[0038] Preferably, in one implementation, the upper sealing end 601 is provided with a tapered surface, and a tapered surface that matches the shape of the tapered surface of the upper sealing end 601 is provided at the connection between the second interface cavity 402 and the valve core channel 3, so that the upper sealing end 601 forms a line sealing structure when sealing the connection between the valve core channel 3 and the external interface 4, thereby increasing the sealing effect.

[0039] Preferably, the lower sealing end 501 is provided with a tapered surface, and the position where the valve seat channel 203 connects to the second cavity 202 is provided with a tapered surface that matches the tapered surface of the lower sealing end 501, so that the lower sealing end 501 forms a line sealing structure when blocking the oil outlet valve seat 2, thereby increasing the sealing effect.

[0040] Preferably, the outer diameter of the lower sealing end 501 is larger than the inner diameter of the valve core channel 3, the lower sealing end 501 forms a limit outside the port of the valve core channel 3, and the lower sealing end 501 is always placed inside the second cavity 202.

[0041] One end of the oil outlet channel 8 is connected to the second cavity 202, and the other end of the oil outlet channel 8 is connected to the external interface 4 through the side wall of the first interface cavity 401; the inner diameter of the oil outlet channel 8 is equal to the inner diameter of the second interface cavity 402.

[0042] In one implementation process, an O-ring is provided on the outer area of ​​the external interface 4 of the oil outlet valve housing 1, and an O-ring is provided on the outer area of ​​the oil outlet valve seat 2 of the oil outlet valve housing to ensure sealing during installation.

[0043] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An oil outlet valve assembly with a dual-valve-core coupling structure, characterized in that, The following is provided inside the oil outlet valve housing: The fuel outlet valve seat is used to connect to the booster chamber to realize fuel output and pressure relief return; The valve core channel has one end corresponding to the oil outlet valve seat and the other end connected to an external interface for fuel output and pressure relief return. The valve core channel is provided with a lower inner valve core for blocking the oil outlet valve seat, an upper inner valve core for blocking the connection between the valve core channel and the external interface, and an elastic element that is compressed and supported between the upper inner valve core and the lower inner valve core. The elastic element is used to maintain the blocking state of the upper inner valve core and the lower inner valve core. The oil outlet passage is configured in parallel with the valve core passage to supply fuel from the oil outlet valve seat to the external interface; When the oil pressure on the oil outlet valve seat side is greater than the elastic support force of the elastic element, the lower inner valve core releases the blockage on the oil outlet valve seat and the oil outlet flow channel connects the oil outlet valve seat and the external interface. When the oil pressure on the external interface side is greater than the elastic support force of the elastic element, the upper inner valve core moves closer to the lower inner valve core and releases the blockage at the connection between the valve core channel and the external interface. The valve core channel, together with the upper inner valve core and the lower inner valve core, forms a pressure relief channel connecting the external interface and the oil outlet valve seat.

2. The oil outlet valve assembly with a dual-valve-core coupling structure according to claim 1, characterized in that, The upper inner valve core includes an upper sealing end, a cylindrical plug, and a tail column arranged coaxially in sequence. The upper sealing end is used to seal the connection between the valve core channel and the external interface. The cylindrical plug has an outer diameter that matches the inner diameter of the valve core channel. The outer diameter of the tail column is smaller than the outer diameter of the cylindrical plug and provides compression guidance when the elastic element is elastically compressed. The upper sealing end has a tapered surface that matches the shape of the connection between the valve core channel and the external interface.

3. The oil outlet valve assembly with a dual-valve-core coupling structure according to claim 2, characterized in that, The lower inner valve core includes a lower sealing end and a plunger body. The lower sealing end is disposed at one end of the plunger body, and the other end of the plunger body abuts against the elastic element. The lower sealing end is used to block the oil outlet valve seat. The outer diameter of the plunger body is adapted to the inner diameter of the valve core channel. The lower sealing end has a tapered surface adapted to the shape of the oil outlet valve seat.

4. The oil outlet valve assembly with a dual-valve-core coupling structure according to claim 3, characterized in that, The cylindrical plug has at least one concave pressure relief groove on its side, and the two ends of the pressure relief groove penetrate the two ends of the cylindrical plug in the axial direction; the lower inner valve core has a central through hole in the axial direction.

5. The oil outlet valve assembly with a dual-valve-core coupling structure according to claim 4, characterized in that, The sidewall of the plunger body is provided with at least one plane, and the plane is provided with a concave structure that connects to the central through hole.

6. The oil outlet valve assembly with a dual-valve-core coupling structure according to claim 3, characterized in that, The outer diameter of the lower sealing end is larger than the inner diameter of the valve core channel, and the lower sealing end forms a limit outside the port of the valve core channel.

7. The oil outlet valve assembly with a dual-valve-core coupling structure according to claim 4, characterized in that, The oil outlet valve seat has a first cavity, a second cavity, and a valve seat channel connecting the first cavity and the second cavity. The first cavity is connected to the pressurization cavity, and the second cavity is connected to both the oil outlet channel and the valve core channel. The inner diameter of the first cavity and the second cavity is larger than the inner diameter of the valve seat channel. The lower sealing end is placed in the second cavity, and the valve seat channel is positioned to connect to the second cavity with a tapered surface that matches the lower sealing end.

8. The oil outlet valve assembly with a dual-valve-core coupling structure according to claim 7, characterized in that, The external interface includes a first interface cavity and a second interface cavity connected to each other. The inner diameter of the first interface cavity is larger than the inner diameter of the second interface cavity. The second interface cavity is connected to the valve core channel. A tapered transition cavity is provided at the connection between the first interface cavity and the second interface cavity. The inner diameter of the first interface cavity is smaller than the inner diameter of the valve core channel. A tapered surface adapted to the shape of the upper sealing end is provided at the connection between the second interface cavity and the valve core channel.

9. The oil outlet valve assembly with a dual-valve-core coupling structure according to claim 8, characterized in that, One end of the oil outlet channel is connected to the second cavity, and the other end of the oil outlet channel is connected to an external interface through the side wall of the first interface cavity; the inner diameter of the oil outlet channel is equal to the inner diameter of the second interface cavity.

10. The oil outlet valve assembly with a dual-valve-core coupling structure according to claim 4, characterized in that, The side of the plunger is evenly provided with four concave pressure relief grooves, and the side wall of the plunger body is evenly provided with four planes.

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