A high pressure piston pump

Abstract

The utility model discloses a high pressure plunger pump, including the pump body, be equipped with the plunger cavity in the pump body, the inside activity of plunger cavity is equipped with the plunger, and the plunger includes the plunger body, and the front end of plunger body is provided with the plunger head, and the side of plunger head is connected with the first sealing washer, and the front end side of plunger head is embedded with the step face, the utility model discloses the plunger of high pressure plunger pump through setting up the linkage structure of stop end cover with adjusting ring, V ring with movable gap, make the first sealing washer of plunger head side can automatically adjust the gap between with plunger cavity inner wall according to the working medium pressure. When high pressure, the first sealing washer is extruded radial expansion, and the sealing property is strengthened, prevents the leakage, when low pressure, the first sealing washer restores the original shape, reduces the friction resistance of plunger cavity inner wall. The structure has effectively solved the contradiction between friction and leakage in traditional plunger sealing, has realized the self -adaptation sealing, has prolonged the service life of sealing washer, has improved the working efficiency and reliability of high pressure pump.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump technology, and specifically to a high-pressure plunger pump. Background Technology

[0002] High-pressure plunger pumps are widely used in industrial fields, and the sealing performance of their plungers is crucial. In existing technology, plunger pumps typically achieve sealing through fixed-size sealing rings. For example, CN223387516U describes a high-pressure plunger pump including a plunger body movably disposed within a plunger cavity, with a sealing ring disposed on the plunger body. However, this fixed-size sealing ring has at least the following drawbacks during operation: To ensure sealing under high pressure, the sealing ring and the inner wall of the plunger cavity need to maintain a small fit clearance, but this will lead to unnecessary wear at low pressure. On the other hand, if the fit clearance is increased to reduce friction, it will lead to leakage of the working fluid under high pressure.

[0003] Therefore, there is an urgent need for a plunger structure that can automatically adjust the sealing gap according to the working pressure. Utility Model Content

[0004] The purpose of this invention is to propose a high-pressure plunger pump that can automatically adjust the sealing performance according to the working pressure, so as to achieve the best balance between friction and sealing under different working conditions.

[0005] To solve the above problems, the present invention provides the following technical solution, including a pump body, a plunger cavity provided in the pump body, a plunger movably provided inside the plunger cavity, the plunger including a plunger body, a plunger head provided at the front end of the plunger body, a first sealing ring connected to the side of the plunger head, a stepped surface embedded in the front end side of the plunger head, and a stop end cap axially movably connected to the front end of the plunger head through a limiting structure, the stop end cap covering the opening side of the stepped surface, and a movable gap provided between the stop end cap and the plunger head; A first sealing ring and an adjusting ring are slidably fitted inside the stepped surface. The adjusting ring is located on the side near the stop end cover, and a second sealing ring is connected to the side of the adjusting ring. A V-shaped groove is embedded on the side of the first sealing ring near the adjusting ring, and a V-shaped ring that is movably inserted into the V-shaped groove is integrally formed on the side of the adjusting ring near the first sealing ring.

[0006] Compared with existing technologies, the beneficial effects of this invention are that the plunger of the high-pressure plunger pump of this invention, through the linkage structure of a stop end cap with a movable clearance, an adjusting ring, and a V-ring, allows the first sealing ring on the side of the plunger head to automatically adjust the gap between itself and the inner wall of the plunger cavity according to the working fluid pressure. Under high pressure, the first sealing ring expands radially under compression, enhancing sealing and preventing leakage; under low pressure, the first sealing ring returns to its original shape, reducing the frictional resistance of the inner wall of the plunger cavity. This structure effectively solves the contradiction between friction and leakage in traditional plunger seals, achieving self-adaptive sealing, extending the service life of the sealing ring, and improving the working efficiency and reliability of the high-pressure pump. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the internal structure of the high-pressure plunger pump of this utility model.

[0008] Figure 2 This is a schematic diagram of the plunger explosion structure of this utility model.

[0009] Figure 3 This is a schematic diagram of the cross-sectional structure of the plunger of this utility model.

[0010] Figure 4 This is a schematic diagram of the three-dimensional structure of the plunger of this utility model.

[0011] Figure 5 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0012] In the figure: 1. Plunger body; 2. Stepped surface; 3. First sealing ring; 4. V-groove; 5. Snap-fit ​​block; 6. Stop end cap; 7. Bolt; 8. Insertion hole; 9. Adjusting ring; 10. Second sealing ring; 11. V-ring; 12. Snap-fit ​​groove; 13. Plunger head; 14. Movement clearance; 15. Pump body; 16. Plunger cavity. Detailed Implementation

[0013] 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.

[0014] Please see Figure 1-5 .

[0015] Example 1 A high-pressure plunger pump includes a pump body 15, a plunger cavity 16 inside the pump body 15, a plunger movably disposed inside the plunger cavity 16, the plunger including a plunger body 1, a plunger head 13 fixedly disposed at the front end of the plunger body 1, a first sealing ring 3 as a basic seal connected to the side of the plunger head 13, the side of the first sealing ring 3 slidingly contacting the inner wall of the plunger cavity 16, wherein the pump body 15 is also connected to a drive mechanism (not shown in the figure), the drive mechanism is used to drive the plunger to move back and forth in the axial direction of the plunger cavity 16, and to suck and expel the working fluid through the plunger head 13. The above is the existing plunger pump structure, which will not be described in detail here.

[0016] In this embodiment, an annular stepped surface 2 is embedded on the front side of the plunger head 13. A stop end cap 6 is connected to the end face of the plunger head 13 through a limiting structure to cover the opening side of the stepped surface 2. Specifically, a snap-fit ​​groove 12 is provided on the end face of the plunger head 13. The cross-section of the snap-fit ​​groove 12 can be rectangular. A snap-fit ​​block 5 matching the snap-fit ​​groove 12 is integrally formed on the inner side of the stop end cap 6. During assembly, the snap-fit ​​block 5 is first embedded into the snap-fit ​​groove 12 to achieve the initial positioning of the stop end cap 6. Then, the bolt 7 is passed through the insertion hole 8 on the stop end cap 6 and screwed into the pre-set threaded hole at the bottom of the snap-fit ​​groove 12.

[0017] It should be noted that bolt 7 does not tightly press the stop end cap 6 onto the plunger head 13, but rather allows for a small axial clearance 14 in the stop end cap 6. The specific details of the clearance 14 can be seen in the diagram. Figure 4 .

[0018] Furthermore, within the cavity formed by the stepped surface 2 and the stop end cap 6, an adjusting ring 9 and a first sealing ring 3 are sequentially placed from the stop end cap 6 side towards the plunger body 1 side. Specifically, the adjusting ring 9 can slide axially within the cavity, and a second sealing ring 10 is connected to the side of the adjusting ring 9, which can play an auxiliary sealing role in the entire sealing assembly. The side of the first sealing ring 3 facing the adjusting ring 9 is machined with a V-shaped groove 4 with a V-shaped cross-section. The adjusting ring 9 is integrally formed with a V-shaped ring 11 corresponding to the V-shaped groove, and the V-shaped ring 11 is movably inserted into the V-shaped groove 4.

[0019] The working principle of this utility model is as follows: When the plunger of this high-pressure plunger pump moves within the plunger cavity 16 to perform the hydraulic stroke, the high-pressure working fluid acts on the end face of the stop end cover 6. Due to the movable gap 14, this pressure pushes the stop end cover 6 towards the plunger body 1, thereby squeezing the adjusting ring 9 behind it. As the adjusting ring 9 moves, its V-shaped ring 11 wedges deeper into the V-groove 4 of the first sealing ring 3, applying a radially outward expanding force to the V-groove 4. This forces the first sealing ring 3 to undergo radial elastic deformation, increasing its outer diameter and thus reducing the gap between the side of the first sealing ring 3 and the inner wall of the plunger cavity 16, enhancing the sealing effect. Conversely, when the pressure decreases, the force decreases, and the first sealing ring 3 returns to its original shape due to its elasticity, restoring the gap with the inner wall of the plunger cavity 16. The frictional force decreases accordingly, avoiding unnecessary wear.

[0020] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0021] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure plunger pump, comprising a pump body, a plunger cavity within the pump body, a plunger movably disposed within the plunger cavity, the plunger comprising a plunger body, a plunger head disposed at the front end of the plunger body, and a first sealing ring connected to the side of the plunger head, characterized in that... The front end of the plunger head is embedded with a stepped surface, and the front end of the plunger head is axially movably connected to a stop end cap through a limiting structure. The stop end cap covers the opening side of the stepped surface, and there is a movable gap between the stop end cap and the plunger head. A first sealing ring and an adjusting ring are slidably fitted inside the stepped surface. The adjusting ring is located on the side near the stop end cover. A V-shaped groove is embedded on the side of the first sealing ring near the adjusting ring. A V-shaped ring that is movably inserted into the V-shaped groove is integrally formed on the side of the adjusting ring near the first sealing ring.

2. A high-pressure plunger pump as described in claim 1, characterized in that, The limiting structure includes a bolt, a snap-fit ​​groove embedded in the front end of the plunger head, a corresponding snap-fit ​​block integrally formed on the stop end cap, and an insertion hole through the stop end cap. After the bolt is inserted into the insertion hole, it is threadedly connected to the bottom end of the snap-fit ​​groove.

3. A high-pressure plunger pump as described in claim 1 or 2, characterized in that, A second sealing ring is connected to the side of the adjusting ring.

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