A coupling structure for a descaling pump plunger head

Abstract

The utility model provides a kind of descaling pump plunger head coupling structure, including plunger assembly, piston assembly and connecting assembly, connecting assembly includes silk cover, hoop hemisphere, free hemisphere and fastener, silk cover is connected in the end of piston assembly, hoop hemisphere, free hemisphere is rotatably arranged in silk cover, the plane of hoop hemisphere and the plane of free hemisphere are set to coincide, and the plane of free hemisphere is recessed to form oil storage pinhole, and oil storage pinhole is used to fill lubricating oil. So it is designed to rotate the free hemisphere and the hoop hemisphere in the silk cover with the design of rigid contact, directly adapt to the different shaft conditions of piston and plunger, transfer tensile force through spherical surface coincidence, ensure that tensile force is evenly distributed under different angles, fundamentally eliminate local stress amplification effect;And the oil storage pinhole of free hemisphere plane can store lubricating oil for a long time, both can reduce the frictional resistance of two hemisphere plane coincidence, ensure rotation flexibility, and can avoid component wear caused by dry friction.

Description

Technical Field

[0001] This utility model relates to the field of descaling pump technology, and in particular to a descaling pump plunger head connection structure. Background Technology

[0002] In heavy industries such as steel metallurgy, high-pressure descaling pumps are the core equipment for surface descaling in steel production. Their operational reliability directly determines the surface quality of steel, production continuity, and overall operating costs. To meet the wear-resistant and corrosion-resistant requirements under high-pressure conditions, ceramic materials are widely used in the industry to manufacture plunger components. Ceramic plungers, with their excellent hardness, chemical stability, and wear resistance, effectively solve the problems of easy corrosion and short lifespan of metal plungers, becoming the core actuator of high-pressure descaling pumps.

[0003] However, under the extreme operating conditions of high-pressure descaling pumps, when line contact is formed between the plunger and the metal guide sleeve due to installation deviations, equipment wear, or insufficient assembly precision, the axes of the piston and plunger are prone to misalignment (including parallel offset or cross offset). This results in uneven distribution of tensile force on the plunger cross-section, creating localized stress concentration. While the uneven shear stress itself cannot "shear" the ceramic, it amplifies the basic shear stress through mechanical transmission, generating localized tensile force. This amplified localized tensile stress immediately triggers brittle fracture of the ceramic material, ultimately leading to plunger failure. Existing plunger head connection structures are mostly planar contact designs. Their rigid connection method cannot adapt to axial deviations between the piston and plunger, failing to resolve the problem of uneven tensile force distribution or suppress the amplification effect of shear stress. Consequently, the risk of brittle fracture of ceramic plungers remains uncontrolled.

[0004] Therefore, it is necessary to propose a descaling pump plunger head connection structure to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of this utility model is to provide a plunger head connection structure for a descaling pump, so as to solve the problem that the rigid connection at the plunger connection in the prior art is prone to uneven stress distribution.

[0006] To achieve the above objectives, this utility model provides a descaling pump plunger head connection structure, including a plunger assembly, a piston assembly, and a connecting assembly; wherein, The connecting assembly includes a threaded sleeve, a clamping hemisphere, a free hemisphere, and a fastener. The threaded sleeve is connected to the end of the piston assembly. The fastener is connected to the outer periphery of the threaded sleeve and abuts against the end of the piston assembly. The free hemisphere is disposed in the threaded sleeve, and the spherical surface of the free hemisphere abuts against the inner side of the end of the piston assembly. The clamping hemisphere is connected to the end of the plunger assembly and is engaged in the threaded sleeve. Both the clamping hemisphere and the free hemisphere are rotatably disposed in the threaded sleeve. The plane of the clamping hemisphere fits into the plane of the free hemisphere, and the plane of the free hemisphere is recessed to form an oil storage hole for filling with lubricating oil.

[0007] Preferably, the plunger assembly includes a plunger and a housing, the plunger being connected to the housing, and the clamp hemisphere being connected to the end of the plunger extending out of the housing.

[0008] Preferably, the piston assembly includes a piston and a base, the base being connected to the inside of the piston, the spherical surface of the free hemisphere abutting against the base, and the threaded sleeve being connected to the inner side of the end of the piston.

[0009] Preferably, the piston has an internal thread on the inner side of its end, and the threaded sleeve has an external thread on its outer circumference. The threaded sleeve is connected to the inner side of the piston's end by the thread.

[0010] Preferably, the fastener is a nut, one end of the threaded sleeve extends out of the piston, and the nut is screwed onto the outside of the extended end of the threaded sleeve and abuts against the piston.

[0011] Preferably, the peripheral wall of the clamp hemisphere has a notch, and two bolt holes perpendicular to the notch surface are provided on both sides of the notch. The clamp hemisphere is fastened to the end of the plunger by bolts passing through the two bolt holes.

[0012] Preferably, the surfaces of the free hemisphere and the clamping hemisphere are coated with lubricating grease.

[0013] Preferably, there are multiple oil-retaining holes, which are arranged at equal intervals on the plane of the free hemisphere.

[0014] Preferably, the diameter of each of the oil storage holes is 2mm to 3mm.

[0015] Preferably, the side of the base closest to the free hemisphere has an arc shape that matches the spherical surface.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a descaling pump plunger head connection structure, including a plunger assembly, a piston assembly, and a connecting assembly. The connecting assembly includes a threaded sleeve, a clamping hemisphere, a free hemisphere, and fasteners. The threaded sleeve is connected to the end of the piston assembly, and the fasteners are connected to the outer periphery of the threaded sleeve and abut against the end of the piston assembly. The free hemisphere is disposed in the threaded sleeve, and the spherical surface of the free hemisphere abuts against the inner side of the end of the piston assembly. The clamping hemisphere is connected to the end of the plunger assembly and is locked in the threaded sleeve. Both the clamping hemisphere and the free hemisphere are rotatably disposed in the threaded sleeve. The plane of the clamping hemisphere fits against the plane of the free hemisphere, and the plane of the free hemisphere is recessed to form an oil storage hole for filling with lubricating oil. This rigid contact design allows for the rotation of the free hemisphere and the clamping hemisphere within the threaded sleeve, directly adapting to different axial operating conditions of the piston and plunger. The spherical contact transmits tension, ensuring uniform force distribution at different angles and fundamentally eliminating localized stress amplification. Furthermore, the small oil storage holes on the free hemisphere's surface can store lubricating oil for an extended period, reducing frictional resistance at the contact point and ensuring rotational flexibility. This also prevents component wear caused by dry friction, further extending the service life of the spherical mating structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure in one embodiment of the present utility model; Figure 2 This is a cross-sectional schematic diagram of the overall structure in one embodiment of the present invention; Figure 3 This is an exploded view of the overall structure in one embodiment of the present invention.

[0019] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] Explanation of icon numbers: 10. Plunger assembly; 110. Plunger; 120. Housing; 20. Piston assembly; 210. Piston; 220. Base; 30. Connecting assembly; 310. Threaded sleeve; 320. Clamping hemisphere; 321. Notch; 330. Free hemisphere; 331. Oil storage hole; 340. Fastener; 341. Nut. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0025] Please see the appendix Figure 1-3 The present invention provides a descaling pump plunger 110 head connection structure in one embodiment, including a plunger assembly 10, a piston assembly 20, and a connecting assembly 30, the specific scheme of which is as follows: The connecting assembly 30 includes a threaded sleeve 310, a clamping hemisphere 320, a free hemisphere 330, and a fastener 340. The threaded sleeve 310 is connected to the end of the piston assembly 20. The fastener 340 is connected to the outer periphery of the threaded sleeve 310 and abuts against the end of the piston assembly 20. The free hemisphere 330 is disposed in the threaded sleeve 310, and the spherical surface of the free hemisphere 330 abuts against the inner side of the end of the piston assembly 20. The clamping hemisphere 320 is connected to the end of the plunger assembly 10 and is engaged in the threaded sleeve 310. Both the clamping hemisphere 320 and the free hemisphere 330 are rotatably disposed in the threaded sleeve 310. The plane of the clamping hemisphere 320 fits against the plane of the free hemisphere 330, and the plane of the free hemisphere 330 is recessed to form an oil storage hole 331, which is used to fill lubricating oil.

[0026] Specifically, the head connection structure of the descaling pump plunger 110 in this application includes a plunger assembly 10, a piston assembly 20, and a connecting assembly 30. The plunger assembly 10 and the piston assembly 20 are components in the high-pressure descaling pump. This application replaces the traditional rigid connection with a spherical splicing connecting assembly 30 to avoid stress concentration caused by uneven stress distribution. The connecting assembly 30 includes a threaded sleeve 310, a clamping hemisphere 320, a free hemisphere 330, and a fastener 340. The threaded sleeve 310 serves as a connecting bridge. With stable docking with piston assembly 20, fastener 340 locks the axial position of threaded sleeve 310 through a resisting action, preventing components from loosening under high pressure conditions. The rotatable design of free hemisphere 330 and clamping hemisphere 320 within threaded sleeve 310 directly adapts to the parallel or intersecting deviations of the axes of piston 210 and plunger 110. The tensile force is transmitted through spherical contact, ensuring uniform distribution of tensile force at different angles and fundamentally eliminating the local stress amplification effect. By changing the original tensile force plane to a spherical surface, equal tensile force can be achieved at different angles, thus mitigating the stress amplification effect of the plunger assembly. The misalignment of component 10 and piston assembly 20 during movement causes uneven tension. This is addressed by optimizing the structure of the tension components, eliminating uneven stress, extending the service life of plunger 110, and reducing production costs. Meanwhile, the oil storage orifice 331 on the free hemisphere 330 plane can store lubricating oil for an extended period. This reduces frictional resistance at the contact point between the two hemispheres, ensuring rotational flexibility, and prevents component wear caused by dry friction, further extending the service life of the spherical mating structure. Ultimately, this reduces the risk of brittle fracture of the ceramic plunger 110 and ensures stable equipment operation. The lubricant is improved; preferably, there are multiple oil storage holes 331, which are equidistantly arranged on the plane of the free hemisphere 330. This allows the lubricant to be evenly distributed on the plane of the free hemisphere 330, ensuring that each contact point between the clamping hemisphere 320 and the plane of the free hemisphere 330 is adequately lubricated, avoiding uneven friction caused by local lubrication deficiency. The diameter of each oil storage hole 331 can be set to 2mm~3mm, and its specific size can be set by those skilled in the art according to actual needs.

[0027] In a preferred embodiment of the present invention, the plunger assembly 10 includes a plunger 110 and a housing 120, wherein the plunger 110 is connected to the housing 120, and the clamping hemisphere 320 is connected to the end of the plunger 110 that extends out of the housing 120.

[0028] It should be noted that the housing 120's enveloping positioning of the plunger 110 ensures that the plunger 110 maintains a stable axial movement trajectory during high-pressure reciprocating motion, preventing axial deviation from being exacerbated by plunger 110 wobbling. Simultaneously, directly connecting the clamp hemisphere 320 to the end of the plunger 110 extending from the housing 120 shortens the force transmission path between the clamp hemisphere 320 and the plunger 110, reducing losses and stress attenuation during force transmission, and ensuring that tensile force can be directly transmitted to the free hemisphere 330 through the clamp hemisphere 320. Furthermore, the protective function of the housing 120 prevents accidental collisions between the plunger 110 and external components, further extending the overall service life of the plunger 110, while simplifying the assembly process of the plunger 110 and the clamp hemisphere 320, improving equipment assembly efficiency.

[0029] In a preferred embodiment of the present invention, the piston assembly 20 includes a piston 210 and a base 220. The base 220 is connected to the inside of the piston 210, the spherical surface of the free hemisphere 330 abuts against the base 220, and the threaded sleeve 310 is connected to the inner side of the end of the piston 210.

[0030] It is important to note that the contact between the base 220 and the spherical surface of the free hemisphere 330 creates a precise support structure for the free hemisphere 330. The presence of the base 220 not only provides a stable support point for the free hemisphere 330, preventing axial displacement under high pressure, but also increases the contact area between the two through its close fit design with the spherical surface of the free hemisphere 330. This allows the pressure borne by the free hemisphere 330 to be evenly distributed to the base 220, eliminating stress concentration caused by localized stress. Preferably, the side of the base 220 closest to the free hemisphere 330 has an arc shape that matches the spherical surface. The arc-shaped fit design guides the free hemisphere 330 to rotate along a fixed trajectory, further ensuring the stability of the linkage between the piston 210 and the plunger 110. In addition, the arc structure can reduce the frictional resistance between the free hemisphere 330 and the base 220, improve rotational flexibility, indirectly reduce the spherical surface wear rate, and extend the service life of the overall structure.

[0031] In a preferred embodiment of the present invention, the piston 210 has an internal thread on the inner side of its end, and the threaded sleeve 310 has an external thread on its outer circumference. The threaded sleeve 310 is threadedly connected to the inner side of the piston 210's end.

[0032] It is worth noting that the detachability of the threaded connection facilitates the disassembly and replacement of internal components such as the threaded sleeve 310 and the free hemisphere 330 during subsequent equipment maintenance, without the need to completely disassemble the piston 210 or plunger 110, thus reducing maintenance difficulty and cost. Furthermore, the adjustable tightness of the threaded connection allows for precise control of the axial fit of the base 220, the free hemisphere 330, the clamp hemisphere 320, and the plunger 110 by rotating the threaded sleeve 310. This ensures that all components are in close contact to achieve uniform force transmission, while also allowing for a rotational margin by "loosening half a turn after tightening," thus meeting the flexible rotation requirements of the spherical components.

[0033] In a preferred embodiment of the present invention, the fastener 340 is a nut 341, one end of the threaded sleeve 310 extends out of the piston 210, and the nut 341 is screwed onto the outside of the extended end of the threaded sleeve 310 and abuts against the piston 210.

[0034] It is worth noting that by tightening the nut 341 onto the outside of the protruding end of the threaded sleeve 310, an axial limiting force can be directly applied to the threaded sleeve 310 to prevent the threaded sleeve 310 from moving along the internal thread of the piston 210 during high-frequency reciprocating motion, thus ensuring the relative position stability of each component. At the same time, the threaded fit of the nut 341 can be finely adjusted to ensure the locking effect without restricting the spherical rotation of the clamp hemisphere 320 and the free hemisphere 330, further enhancing the adaptability to axial deviation.

[0035] Furthermore, the peripheral wall of the clamp hemisphere 320 has a notch 321, and two bolt holes perpendicular to the surface of the notch 321 are provided on both sides of the notch 321. The clamp hemisphere 320 is fastened to the end of the plunger 110 by bolts passing through the two bolt holes.

[0036] It should be noted that the notch 321 design allows the clamp hemisphere 320 to have a certain elastic opening and closing space, which can be easily fitted onto the end of the plunger 110, avoiding the ceramic plunger 110 from being impacted by force due to forced assembly; and the fastening method of the bolt passing through the bolt hole can precisely control the clamping force of the clamp hemisphere 320 on the plunger 110 by adjusting the bolt torque.

[0037] Furthermore, the surfaces of the free hemisphere 330 and the clamping hemisphere 320 are coated with lubricating grease.

[0038] It should be understood that lubricating grease can form a protective film on the spherical mating surface, significantly reducing the coefficient of friction when the two hemispheres rotate relative to each other, reducing the impact of friction and wear on the spherical surface accuracy, and extending the service life of spherical components.

[0039] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A plunger head connection structure for a descaling pump, characterized in that, This includes a plunger assembly, a piston assembly, and a connecting assembly; among which, The connecting assembly includes a threaded sleeve, a clamping hemisphere, a free hemisphere, and a fastener. The threaded sleeve is connected to the end of the piston assembly. The fastener is connected to the outer periphery of the threaded sleeve and abuts against the end of the piston assembly. The free hemisphere is disposed in the threaded sleeve, and the spherical surface of the free hemisphere abuts against the inner side of the end of the piston assembly. The clamping hemisphere is connected to the end of the plunger assembly and is engaged in the threaded sleeve. Both the clamping hemisphere and the free hemisphere are rotatably disposed in the threaded sleeve. The plane of the clamping hemisphere fits into the plane of the free hemisphere, and the plane of the free hemisphere is recessed to form an oil storage hole for filling with lubricating oil.

2. The descaling pump plunger head connection structure according to claim 1, characterized in that, The plunger assembly includes a plunger and a housing, the plunger being connected to the housing, and a clamp hemispherical connection being connected to the end of the plunger extending out of the housing.

3. The descaling pump plunger head connection structure according to claim 2, characterized in that, The piston assembly includes a piston and a base, the base being connected to the inside of the piston, the spherical surface of the free hemisphere abutting against the base, and the threaded sleeve being connected to the inner side of the end of the piston.

4. The descaling pump plunger head connection structure according to claim 3, characterized in that, The piston has an internal thread on the inner side of its end, and the threaded sleeve has an external thread on its outer circumference. The threaded sleeve is connected to the inner side of the piston's end by the thread.

5. The descaling pump plunger head connection structure according to claim 4, characterized in that, The fastener is a nut, one end of the threaded sleeve extends out of the piston, and the nut is screwed onto the outside of the extended end of the threaded sleeve and abuts against the piston.

6. The descaling pump plunger head connection structure according to claim 2, characterized in that, The peripheral wall of the clamp hemisphere has a notch, and two bolt holes perpendicular to the notch surface are provided on both sides of the notch. The clamp hemisphere is fastened to the end of the plunger by bolts passing through the two bolt holes.

7. The descaling pump plunger head connection structure according to claim 1, characterized in that, The surfaces of the free hemisphere and the clamp hemisphere are coated with lubricating grease.

8. The descaling pump plunger head connection structure according to claim 1, characterized in that, The number of oil-retaining holes is multiple, and the multiple oil-retaining holes are arranged at equal intervals on the plane of the free hemisphere.

9. The descaling pump plunger head connection structure according to claim 8, characterized in that, The diameter of each of the oil storage holes is 2mm to 3mm.

10. The descaling pump plunger head connection structure according to claim 3, characterized in that, The base has an arc shape on the side closest to the free hemisphere that matches the spherical surface.

Images