High-pressure reciprocating plunger pump core

Abstract

The utility model provides a high-pressure reciprocating plunger pump core. The high-pressure reciprocating plunger pump core comprises a plunger, a limiting gasket, a main shell, a main spring, a valve element, a guide ring, a bottom screw plug and a secondary spring. The plunger is provided with a clamping part which is matched with the limiting gasket and the main spring, so that the plunger moves stably, abrasion of the sealing assembly is reduced, and the sealing reliability is improved. The main spring is connected outside the main shell in a sleeving mode to form step-shaped connection, and stable axial movement is ensured. The valve element is located in the main shell, the end cover is arranged at the upper end, the guide ring is clamped between the valve element and the main shell, the valve element is guided to move accurately, friction is reduced, and the service life of the pump element is prolonged. A limiting hole is formed in the bottom screw plug, and deviation and abnormal abrasion are avoided. The secondary spring strengthens the pressure balance capability and optimizes the response performance. The disassembly and maintenance of the pump core are simplified, the maintenance cost is reduced, the adaptability and reliability are improved, and the pump is particularly suitable for high-pressure and high-frequency working environments. Through reasonable sealing, guiding and pressure adjusting, efficient and stable operation of the pump core under extreme working conditions is ensured.

Description

Technical Field

[0001] This application relates to the field of high-pressure pump technology, and in particular to a high-pressure reciprocating plunger pump core. Background Technology

[0002] High-pressure reciprocating piston pumps are important equipment widely used in fluid transportation, booster injection, and hydraulic transmission. Traditional piston pump cores primarily achieve fluid intake and discharge by changing the volume of the working chamber through the reciprocating motion of the piston. Due to their high-pressure, high-impact operating characteristics, high requirements are placed on the pump core's sealing performance, wear resistance, structural strength, and efficiency.

[0003] Current plunger pump core technology still faces the following challenges: First, sealing is a major problem for high-pressure reciprocating plunger pumps. Under high pressure and high-speed motion, long-term friction easily occurs between the plunger and the sealing components. This friction leads to accelerated wear of the sealing rings, further causing leakage and affecting the pump's sealing performance and service life. Especially under high pressure, the friction between the liquid and the sealing material is high, easily leading to premature aging of the sealing rings, thus increasing maintenance and replacement costs. Second, heat dissipation is also a technical challenge for high-pressure reciprocating plunger pumps. Under high-pressure operating conditions, the plunger pump core generates a large amount of heat, especially under high-frequency motion, where friction and fluid flow resistance exacerbate heat accumulation. If the heat dissipation design is inadequate, the pump core's operating temperature will rise, affecting the pump's performance stability and even causing premature failure of pump core components. Finally, disassembly and maintenance are also prominent issues in existing technology. Traditional plunger pump designs are often complex to disassemble, requiring specialized equipment and technicians, and replacement costs are high after damage. The cumbersome disassembly and maintenance process of high-pressure pump cores makes it difficult to meet the needs of rapid response and low-cost repair. Utility Model Content

[0004] The purpose of this application is to overcome the problems mentioned above, such as the long-term friction between the plunger and the main housing of the pump core under high pressure, which easily generates a lot of heat, leading to premature aging or damage of pump components, and the complex disassembly and maintenance process of the pump core structure, which requires professional technicians and tools, increasing the difficulty and cost of maintenance.

[0005] According to one aspect of this application, a high-pressure reciprocating plunger pump core is provided, comprising:

[0006] A plunger, wherein the plunger is provided with a snap-fit ​​portion;

[0007] A limiting washer is engaged with the engaging portion;

[0008] Main housing, which accommodates the plunger;

[0009] The main spring is sleeved on the outside of the main housing, with one end abutting against the limiting gasket and the other end abutting against the main housing. When viewed axially, the contact point between the main housing and the main spring is stepped.

[0010] A valve core is housed inside the main housing, and an end cap is provided at the upper end of the valve core;

[0011] A guide ring is sandwiched between the valve core and the main housing to guide the movement of the valve core;

[0012] A bottom screw plug is provided inside the main housing. When viewed axially, a limit hole is provided, through which the valve core passes.

[0013] The secondary spring is sleeved on the outside of the valve core, with one end abutting against the guide ring and the other end abutting against the bottom screw plug.

[0014] Preferably, the plunger surface is provided with a ceramic or titanium nitride coating to reduce friction and improve the wear resistance of the plunger.

[0015] Preferably, the main housing comprises:

[0016] An axially penetrating cavity is formed by a coaxially connected plunger receiving section, a valve core receiving section, and a bottom screw plug mounting section.

[0017] Preferably, the inner diameter of the valve core receiving section is larger than the inner diameter of the plunger receiving section, a beveled abutment surface is provided at the connection between the valve core receiving section and the plunger receiving section, and a protrusion is provided on the end cap, the shape of which is adapted to the beveled abutment surface.

[0018] Preferably, the inner wall of the bottom screw plug mounting section is provided with an internal thread, the bottom screw plug is provided with an external thread, and the bottom screw plug is threadedly mounted on the bottom screw plug mounting part.

[0019] Preferably, the plunger receiving section is provided with a threaded oil guide groove.

[0020] Preferably, the limiting washer and the main spring have a stepped snap-fit ​​structure at the contact point, and the outer diameter of the stepped snap-fit ​​structure is adapted to the inner diameter of the main spring.

[0021] Preferably, the main housing is provided with two radially penetrating liquid perforations, the inner diameter of which is smaller than its outer diameter.

[0022] Preferably, the guide ring has a locking portion on its contact surface with the secondary spring to lock the secondary spring in place.

[0023] Preferably, the high-pressure reciprocating plunger pump core has an external thread on its main housing, which is threaded to the high-pressure reciprocating plunger pump, and a sealing gasket is provided at the connection.

[0024] This application has the following beneficial effects:

[0025] A high-pressure reciprocating plunger pump core is provided, designed to improve sealing performance, heat dissipation, and maintenance convenience. By incorporating a snap-fit ​​portion on the plunger, along with a limiting washer and main spring, the plunger movement is made more stable, effectively reducing wear on the sealing components and improving sealing reliability. The main housing adopts a stepped design, which, in conjunction with the main spring, enhances structural strength and optimizes stress distribution. The valve core, through the combination of end caps and guide rings, improves movement accuracy, reduces frictional loss, and extends pump core service life. Furthermore, the design of the bottom screw plug and limiting hole ensures controlled valve core movement, preventing misalignment or abnormal wear. The secondary spring further enhances pressure balance capability and optimizes pump core response performance. The overall structural design simplifies disassembly and maintenance processes, reduces maintenance difficulty and cost, and improves the pump core's adaptability and reliability, making it suitable for high-pressure, high-frequency operating environments. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the appearance of the high-pressure reciprocating plunger pump core according to one embodiment of this application;

[0028] Figure 2 This is an exploded view of the high-pressure reciprocating plunger pump core according to one embodiment of this application.

[0029] Figure 3 This is a bottom view of the main housing of the high-pressure reciprocating plunger pump core according to one embodiment of this application;

[0030] Figure 4 for Figure 3 A cross-sectional view of the main outer shell at point AA;

[0031] Figure 5 This is a schematic diagram of the appearance of the limiting gasket according to one embodiment of this application;

[0032] Figure 6 This is a bottom view of the guide ring described in one embodiment of this application;

[0033] Figure 7 for Figure 6 A cross-sectional view of the guide ring BB.

[0034] Explanation of reference numerals: 100, High-pressure reciprocating plunger pump core; 10, Plunger; 20, Limiting gasket; 21, Stepped snap-fit ​​structure; 30, Main spring; 40, Main housing; 41, External threaded part; 42, Plunger receiving section; 43, Beveled abutment surface; 44, Valve core receiving section; 45, Bottom screw plug mounting section; 46, Threaded oil guide groove; 50, Valve core; 51, End cap; 60, Guide ring; 61, Snap-fit ​​part; 70, Secondary spring; 80, Bottom screw plug. Detailed Implementation

[0035] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0036] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] Please refer to Figure 1 , Figure 2This application provides a high-pressure reciprocating plunger pump core 100, comprising: a plunger 10 with a snap-fit ​​portion 61; a limiting gasket 20 snapped into the snap-fit ​​portion 61; a main housing 40 housing the plunger 10; a main spring 30 sleeved on the outside of the main housing 40, with one end abutting against the limiting gasket 20 and the other end abutting against the main housing 40, and the contact point between the main housing 40 and the main spring 30 being stepped when viewed axially; a valve core 50 housed inside the main housing 40, with an end cap 51 on its upper end; a guide ring 60 sandwiched between the valve core 50 and the main housing 40 to guide the movement of the valve core 50; a bottom screw plug 80 disposed inside the main housing 40, with a limiting hole when viewed axially, through which the valve core 50 passes; and a secondary spring 70 sleeved on the outside of the valve core 50, with one end abutting against the guide ring 60 and the other end abutting against the bottom screw plug 80.

[0039] In this embodiment, it should be noted that the plunger 10, as the core moving component of the pump core, changes the working chamber volume through reciprocating motion to achieve fluid intake and discharge. The locking part 61 is used to cooperate with the limiting gasket 20 to ensure that the plunger 10 operates in a predetermined position and prevents accidental displacement. The limiting gasket 20 is installed on the locking part 61 of the plunger 10, serving a limiting function to prevent the plunger 10 from shifting, ensuring motion accuracy and sealing performance. The main housing 40 mainly houses the plunger 10 and internal components, providing mechanical support and protection. Its external design features a stepped structure, facilitating cooperation with the main spring 30, improving force uniformity, and optimizing structural strength. The main spring 30 is sleeved on the outside of the main housing 40, providing a restoring force for the plunger 10 and ensuring the stability of the reciprocating motion. One end abuts against the limiting gasket 20, and the other end abuts against the main housing 40; the stepped design enhances the spring's stability. The valve core 50 is installed inside the main housing 40 and is responsible for controlling the flow of fluid and regulating pressure. An end cap 51 is provided at the upper end to close and support the valve core 50, enabling its stable operation. A guide ring 60 is located between the valve core 50 and the main housing 40 to guide the movement of the valve core 50, ensuring it maintains linear motion under high pressure conditions, reducing offset and friction, and improving durability. A bottom plug 80 is installed at the bottom of the main housing 40 to provide structural fixation. An internal limit hole is designed, through which the valve core 50 passes to ensure its movement range is controlled, preventing seal failure or damage due to offset. A secondary spring 70 is sleeved on the outside of the valve core 50, providing additional elastic support, enabling the valve core 50 to respond quickly to high pressure changes, improving the pump core's fluid control performance. One end abuts against the guide ring 60, and the other end abuts against the bottom plug 80, ensuring the valve core 50 can quickly reset under stress, maintaining stable pump core operation.

[0040] The technical solution of this embodiment, by providing a snap-fit ​​part 61 on the plunger 10, and cooperating with the limiting gasket 20 and the main spring 30, makes the movement of the plunger 10 more stable, effectively reducing the wear of the sealing components and improving the sealing reliability. The main housing 40 adopts a stepped design, which is reasonably matched with the main spring 30 to enhance the structural strength and optimize the force distribution. The valve core 50, through the combination of the end cap 51 and the guide ring 60, improves the accuracy of movement, reduces friction loss, and extends the service life of the pump core. In addition, the design of the bottom screw plug 80 and the limiting hole ensures that the movement of the valve core 50 is controlled, avoiding deviation or abnormal wear. The setting of the secondary spring 70 further enhances the pressure balance capability and optimizes the response performance of the pump core. The overall structural design simplifies the disassembly and maintenance process, reduces the difficulty and cost of maintenance, improves the adaptability and reliability of the pump core, and is suitable for high-pressure, high-frequency operating environments.

[0041] like Figure 3 and Figure 4 As shown, in one specific embodiment, the main housing 40 includes an axially penetrating cavity, which is composed of a plunger receiving section 42, a valve core receiving section 44, and a bottom screw plug mounting section 45 coaxially connected. The inner diameter of the valve core receiving section 44 is larger than the inner diameter of the plunger receiving section 42. A beveled abutment surface 43 is provided at the connection between the valve core receiving section 44 and the plunger receiving section 42. A protrusion is provided on the end cap 51, and the shape of the protrusion is adapted to the beveled abutment surface 43. The inner wall of the bottom screw plug mounting section 45 is provided with an internal thread, and the bottom screw plug 80 is provided with an external thread. The bottom screw plug 80 is threadedly installed on the bottom screw plug 80 mounting part.

[0042] In this embodiment, the main housing 40 has an axially continuous cavity, i.e., a cavity running from top to bottom. This cavity consists of three coaxially connected parts: a plunger receiving section 42 for accommodating the plunger 10, allowing the plunger 10 to reciprocate; a valve core receiving section 44 for accommodating the valve core 50, with an inner diameter larger than the plunger receiving section 42, providing sufficient movement space for the valve core 50; and a bottom screw plug mounting section 45 for mounting the bottom screw plug 80, providing fixing and limiting functions. The inner diameter of the valve core receiving section 44 is larger than that of the plunger receiving section 42, meaning that the valve core 50 has a larger range of motion, which helps reduce motion resistance and improve the accuracy of fluid control. This forms a stepped transition structure, enhancing the sealing and support strength between components. The beveled abutment surface 43 at the connection point, similar to a transition slope, makes the transition between the plunger receiving section 42 and the valve core receiving section 44 smoother. The beveled design helps reduce local stress concentration and improves structural durability. The end cap 51 has a raised portion whose shape matches the beveled abutment surface 43. The raised portion of the end cap 51 fits tightly against the bevel, which helps to enhance the sealing performance and prevent high-pressure fluid leakage. The adaptable design reduces assembly errors, ensures stable operation of the valve core 50 under high pressure, and avoids unnecessary vibration or displacement. The inner wall of the bottom plug mounting section 45 is provided with internal threads, and the bottom plug 80 is provided with external threads. The two are connected by threads. This threaded connection method ensures that the bottom plug 80 can be firmly fixed and is not easy to loosen due to high-pressure impact. The threaded installation method also facilitates disassembly and maintenance, improving maintenance convenience. The thread has good sealing performance, which can effectively prevent liquid leakage and improve the reliability of the overall system.

[0043] The technical solution implemented in this embodiment improves sealing performance: the protrusion of the end cap 51 fits tightly with the beveled abutment surface 43, forming an additional sealing structure and reducing the risk of leakage. The threaded bottom plug 80 ensures overall sealing integrity and prevents liquid leakage. It also enhances structural strength: the beveled abutment surface 43 reduces stress concentration, improves durability, and extends pump core life. The stepped inner diameter design optimizes the stress structure, ensuring stable operation under high pressure. Furthermore, it improves installation and maintenance convenience: the threaded bottom plug 80 makes installation and disassembly easier, reducing maintenance time and costs. The adaptable end cap 51 design facilitates assembly, improving machining accuracy and assembly efficiency. This optimized design enhances the sealing performance, strength, stability, and maintainability of the plunger 10 pump core, making it more suitable for high-pressure, high-load, and high-frequency operating environments.

[0044] Furthermore, the inner wall of the plunger receiving section 42 is provided with a threaded oil guide groove 46. That is, an oil groove is designed to be spirally distributed along the axial direction of the plunger 10's movement path. This spiral groove can guide the lubricating oil to flow along the movement direction of the plunger 10, thereby improving the lubrication effect and optimizing fluid circulation.

[0045] Traditional plunger pumps rely primarily on passive coating of lubricating oil. However, the spiral oil guide groove design allows the lubricating oil to flow along the groove during the reciprocating motion of the plunger 10, forming a dynamic oil film and enhancing lubrication. This reduces dry friction caused by uneven local lubrication and extends the lifespan of the plunger 10 and sealing components.

[0046] The spiral structure promotes uniform distribution of lubricating oil, avoids oil accumulation or dry areas, and improves the long-term operational stability of the pump core.

[0047] The spiral flow pattern of the oil groove forms a continuous oil film between the plunger 10 and the inner wall of the receiving section, reducing direct contact and improving the durability of the sealing components. Under high pressure and high speed conditions, it reduces wear between the plunger 10 and the seals, extending the overall lifespan of the pump core. Under high load conditions, traditional designs may cause the plunger 10 to stick or seize against the cylinder wall due to oil film rupture, while the flow lubrication of the spiral oil groove effectively prevents this problem.

[0048] The spiral structure also enhances heat dissipation, promotes oil circulation, and removes heat. Since the plunger 10 generates frictional heat during high-frequency reciprocating motion, the flow characteristics of the spiral oil guide groove ensure continuous oil replacement, carrying away heat around the plunger 10 and preventing localized overheating. This design is particularly suitable for high-pressure, high-speed operating environments and helps improve system stability.

[0049] The spiral structure also enhances sealing performance, creating a dynamic sealing effect: the spiral design of the oil groove generates a "pump effect" when the plunger 10 moves, causing the oil to flow along the groove and simultaneously forming a stable sealing oil film around the plunger 10. This "liquid seal" effectively prevents high-pressure liquid leakage and improves the overall sealing performance of the system.

[0050] In this embodiment, the structure of the oil guide groove can also be configured as follows:

[0051] The linear oil guide groove (longitudinal oil guide groove) extends linearly along the axial direction of the plunger receiving section 42 without rotation. It is suitable for high-pressure, high-speed operating environments, providing a rapid lubrication channel and reducing frictional heat buildup. The machining process is relatively simple and suitable for standard turning processes.

[0052] The staggered oil guide grooves are multiple parallel or staggered grooves distributed on the inner wall of the plunger receiving section 42. This increases the coverage area of ​​lubricating oil on the plunger 10 surface, improving lubrication. The staggered design provides additional support and reduces localized wear on the seals. Suitable for high-load, high-wear-resistant plunger 10 pump cores, especially for long-life applications.

[0053] The grid-like oil guide grooves consist of longitudinally and laterally staggered grooves forming a grid structure. This ensures uniform oil film distribution, improves lubricant storage capacity, and makes it suitable for equipment operating continuously for extended periods. It also possesses good thermal conductivity, enhancing the pump core's heat dissipation capacity. Suitable for high-speed, high-temperature, and high-pressure environments, such as industrial-grade high-pressure plunger pumps.

[0054] The wavy oil guide grooves, employing periodic wavy curves similar to corrugations, allow the lubricating oil to flow along a non-linear path, improving the uniformity of oil distribution on the plunger 10 surface. This enhances the cooling effect of the lubricating oil and reduces frictional losses. It is suitable for applications with high requirements for lubrication and heat dissipation, such as high-temperature plunger 10 pumps.

[0055] A rectangular annular groove (annular oil guide groove) is formed on the inner wall of the plunger receiving section 42, with multiple annular grooves arranged axially. Each groove is independent or interconnected. It can store a certain amount of lubricating oil, improving lubrication continuity, and is suitable for equipment with intermittent operation. It has a simple structure and is easy to manufacture. It is suitable for low-speed, high-load plunger pumps, such as hydraulic plunger pumps.

[0056] The trapezoidal grooves, with their stepped, progressively varying elevations, facilitate control of oil flow rate and prevent excessive oil loss. They also reduce oil backflow and improve lubrication efficiency. Suitable for applications requiring precise control of lubricant flow rate, such as aerospace hydraulic systems.

[0057] like Figure 5 As shown, in one specific embodiment, a stepped locking structure 21 is provided at the contact point between the limiting washer 20 and the main spring 30, and the outer diameter of the stepped locking structure 21 is adapted to the inner diameter of the main spring 30. With this structure, the main spring 30 can be more stably positioned on the limiting washer 20, preventing axial displacement or wobbling.

[0058] Implementing the technical solution of this embodiment can improve the positioning stability of the spring, accurately limit its movement, and prevent displacement. Due to the complex stress distribution during the installation of the main spring 30, it may shift or tilt after high-frequency vibration and prolonged use. The stepped snap-fit ​​structure 21 allows the bottom end of the main spring 30 to be more firmly fixed to the limiting washer 20, preventing lateral displacement or jumping during operation. It also improves the uniformity of axial force. In traditional designs, if the bottom of the spring directly abuts against a plane, unstable deformation may occur due to uneven force distribution. The stepped structure ensures uniform force distribution at the bottom of the spring, reducing stress concentration caused by force deviation, thereby extending the spring's service life.

[0059] It can also reduce assembly errors, improve assembly consistency, automatically align, and simplify assembly. Because the outer diameter of the step matches the inner diameter of the spring, the spring can automatically align and accurately position itself during installation, reducing human assembly errors and improving production efficiency. It also reduces component wobbling and improves pump core reliability. If the spring has a large tolerance range during assembly, it may cause wobbling or abnormal noise during operation. The snap-fit ​​structure precisely matches the spring size, ensuring the component remains stable after assembly and improving the overall reliability of the machine.

[0060] Enhancing pump core durability, reducing wear, and extending structural lifespan: Traditional springs, where the bottom directly contacts a flat surface, may experience wear on the limiting washer 20 due to long-term friction. The stepped structure provides stable support, reducing localized wear caused by sliding of the contact surface, thereby improving the overall durability of the pump core. Reducing vibration and improving operational smoothness: Springs are prone to resonance or displacement under high-frequency vibration, while the stepped locking structure effectively restricts the spring's degrees of freedom, making its force more stable and reducing unnecessary vibration.

[0061] In an optional embodiment, the main housing 40 is provided with two radially penetrating liquid perforations, the inner diameter of which is smaller than its outer diameter. In this embodiment, the liquid perforations are small holes on the main housing 40, penetrating radially, meaning they pass through from one side of the main housing 40 to the other, allowing liquid to pass through. Their functions include controlling the flow of liquids (such as lubricating oil or working medium) to ensure the normal operation of the plunger 10 pump. During high-pressure reciprocating motion, local high or negative pressure may be generated; the liquid perforations can help regulate the pressure difference between the inside and outside of the cavity, reducing cavitation or cavitation phenomena caused by negative pressure. The pump core operates in a high-temperature environment; the liquid perforations can enhance liquid flow, improve heat dissipation efficiency, and prevent local overheating. The liquid perforations adopt a tapered structure, with the inner diameter smaller than the outer diameter (such as a tapered or stepped orifice). This structure optimizes liquid flow, reduces flow resistance, and enhances sealing performance. If the liquid perforations are completely uniform, external particles may easily enter the pump core; reducing the inner diameter helps to create a certain filtration effect, preventing impurities from clogging or damaging internal components. The constricted liquid perforation hole can control the liquid flow rate, ensure uniform flow, and prevent excessively rapid flow from affecting lubrication or heat dissipation.

[0062] like Figure 6 and Figure 7 As shown, in one specific embodiment, the guide ring 60 has a snap-fit ​​portion 61 on its abutting surface against the secondary spring 70, which snaps the secondary spring 70 in place.

[0063] The function of the snap-fit ​​part 61 is to keep the secondary spring 70 stable during operation, preventing displacement or loosening of the spring during high-frequency reciprocating motion. The snap-fit ​​structure ensures that the secondary spring 70 is always aligned with the guide ring 60, avoiding uneven force distribution caused by misalignment, which would affect the stability of the pump core. If the spring directly contacts the plane of the guide ring 60, prolonged operation may lead to wear; however, the snap-fit ​​part 61 forms a relatively fixed contact point, reducing frictional loss and improving durability.

[0064] The snap-fit ​​method can adopt an annular groove snap-fit ​​(groove + spring end embedding). An annular groove is machined on the abutting surface of the guide ring 60, allowing the end of the secondary spring 70 to be embedded in it, forming a stable snap-fit. The structure is simple, easy to process, and can prevent the spring from sliding axially.

[0065] Alternatively, a limiting boss-type snap-fit ​​(small step + spring end abutment) can be used. An annular boss is added to the abutment surface of the guide ring 60, allowing the spring end to fit around the boss and preventing lateral movement. This enhances the spring's restraint capacity and is suitable for springs with higher stiffness.

[0066] Alternatively, a snap-fit ​​connection (slot + bent spring end) can be used. A small slot is machined on the guide ring 60, and the end of the secondary spring 70 is inserted into the slot by bending, forming a mechanical snap-fit. This can further improve the fixing effect of the spring and prevent axial or rotational deviation.

[0067] Alternatively, a spiral embedded snap-fit ​​connection (spiral groove + spring self-locking) can be used. A spiral groove matching the shape of the spring is used, allowing the spring end to embed into the guide ring 60 along the spiral groove, thus forming a snap-fit. This reduces deformation of the spring end while enhancing the fixing effect.

[0068] In an alternative embodiment, the surface of the plunger 10 is provided with a ceramic or titanium nitride coating to reduce friction and improve the wear resistance of the plunger 10.

[0069] In this embodiment, the plunger 10 surface is coated with a ceramic or titanium nitride coating, which significantly reduces friction, improves wear resistance, and enhances corrosion resistance. Different coatings are suitable for different needs, improving the service life and efficiency of the plunger 10 pump and reducing maintenance costs. Applying a coating to the plunger 10 reduces the coefficient of friction, improves wear resistance, enhances corrosion resistance, and reduces seal damage. The plunger 10 reciprocates at high speed under high pressure, resulting in significant friction with the sealing components. The coating reduces friction and improves energy efficiency. Some coatings have high hardness, effectively reducing the wear rate of the plunger 10 surface and extending its service life. Under certain operating conditions, the plunger 10 may come into contact with corrosive liquids (such as working media containing impurities), and the coating provides additional protection. Low-friction coatings reduce wear on the seals, thereby reducing the risk of leakage and improving seal reliability.

[0070] Alternatively, the coating may be a ceramic coating (such as alumina Al2O3, zirconium oxide ZrO), titanium nitride (TiN) coating, chromium nitride (CrN) coating, diamond-like carbon (DLC) coating, etc.

[0071] In one specific embodiment, the high-pressure reciprocating plunger pump core 100 has an external threaded portion 41 on its main housing 40, which is threadedly connected to the high-pressure reciprocating plunger 10 pump, and a sealing gasket is provided at the connection.

[0072] The threaded connection ensures a tight seal between the pump core and the plunger 10 pump, preventing loosening due to vibration or pressure fluctuations in high-pressure operating environments. A sealing gasket at the connection prevents leakage and ensures safe transmission of high-pressure fluid. The threaded connection design also allows for easy disassembly and replacement of the pump core, reducing maintenance costs and improving system reliability.

[0073] Gaskets are typically made of high-pressure resistant and corrosion-resistant materials, such as PTFE, rubber, or metal alloys, to meet the requirements of high-pressure working environments.

[0074] The embodiments described above are merely examples of several implementations of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A high-pressure reciprocating plunger pump core, characterized in that, include: A plunger, wherein the plunger is provided with a snap-fit ​​portion; A limiting washer is engaged with the engaging portion; Main housing, which accommodates the plunger; The main spring is sleeved on the outside of the main housing, with one end abutting against the limiting gasket and the other end abutting against the main housing. When viewed axially, the contact point between the main housing and the main spring is stepped. A valve core is housed inside the main housing, and an end cap is provided at the upper end of the valve core; A guide ring is sandwiched between the valve core and the main housing to guide the movement of the valve core; A bottom screw plug is provided inside the main housing. When viewed axially, a limit hole is provided, through which the valve core passes. The secondary spring is sleeved on the outside of the valve core, with one end abutting against the guide ring and the other end abutting against the bottom screw plug.

2. The high-pressure reciprocating plunger pump core according to claim 1, characterized in that, The plunger surface is coated with a ceramic or titanium nitride coating to reduce friction and improve the plunger's wear resistance.

3. The high-pressure reciprocating plunger pump core according to claim 1, characterized in that, The main housing includes: An axially penetrating cavity is formed by a coaxially connected plunger receiving section, a valve core receiving section, and a bottom screw plug mounting section.

4. The high-pressure reciprocating plunger pump core according to claim 3, characterized in that, The inner diameter of the valve core receiving section is larger than the inner diameter of the plunger receiving section. A beveled abutment surface is provided at the connection between the valve core receiving section and the plunger receiving section. A protrusion is provided on the end cap, and the shape of the protrusion is adapted to the beveled abutment surface.

5. The high-pressure reciprocating plunger pump core according to claim 3, characterized in that, The inner wall of the bottom screw plug mounting section is provided with an internal thread, and the bottom screw plug is provided with an external thread. The bottom screw plug is threadedly installed on the bottom screw plug mounting part.

6. The high-pressure reciprocating plunger pump core according to claim 3, characterized in that, The inner wall of the plunger receiving section is provided with a threaded oil guide groove.

7. The high-pressure reciprocating plunger pump core according to claim 1, characterized in that, The limiting washer and the main spring have a stepped snap-fit ​​structure at the contact point, and the outer diameter of the stepped snap-fit ​​structure is adapted to the inner diameter of the main spring.

8. The high-pressure reciprocating plunger pump core according to claim 1, characterized in that, The main housing is provided with two through holes that run radially through it, and the inner diameter of the through holes is smaller than the outer diameter.

9. The high-pressure reciprocating plunger pump core according to claim 1, characterized in that, The guide ring has a locking part on its contact surface with the secondary spring, which locks the secondary spring in place.

10. The high-pressure reciprocating plunger pump core according to claim 1, characterized in that, The main housing of the high-pressure reciprocating plunger pump core is provided with an external threaded part, which is connected to the high-pressure reciprocating plunger pump through a thread, and a sealing gasket is provided at the connection.

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