Wear-resistant reciprocating plunger pump of embedded multi-layer sealing ring structure

Abstract

The invention relates to the technical field of plunger pumps, in particular to a wear-resistant reciprocating plunger pump with an embedded multi-layer sealing ring structure, which comprises a cylinder body and a plunger movably mounted in the cylinder body left and right, and further comprises a sealing unit I. The sealing unit I comprises a support ring I detachably mounted in the inner wall of the cylinder body; and a plurality of sealing rings which are distributed at equal intervals in the left-right direction are installed on the right side of the first supporting ring, the plunger is sleeved with the sealing rings, supporting assemblies used for supporting the sealing rings are installed in the sealing rings, and compensation assemblies used for pushing the sealing rings are further installed in the cylinder body. The multiple sealing rings are arranged on the inner wall of the cylinder body, the gaps between the plunger and the cylinder body are sealed through the sealing rings, meanwhile, the compensation assembly gives thrust for the sealing rings and the pushing ring to move leftwards, when the first supporting ring is abraded, the sealing rings can deform in the direction close to the central axis of the plunger, and the leakage condition is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plunger pump, in particular to a wear-resistant reciprocating plunger pump with embedded multi-layer sealing ring structure. BACKGROUND

[0002] The plunger pump is an important device of the hydraulic system. It relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working cavity to realize oil suction and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation. The horizontal plunger pump is installed by several plungers (usually 3 or 6) in parallel, and is pushed by a crankshaft through a connecting rod slider or an eccentric shaft to realize the reciprocating movement of the plunger to realize the suction and discharge of the liquid.

[0003] In order to ensure the sealing between the plunger and the cylinder during reciprocating movement, a sealing ring is installed inside the cylinder for sealing the plunger and the cylinder. The existing sealing ring is embedded in the inside of the cylinder. With the reciprocating movement of the plunger, friction will occur between the cylinder and the sealing ring. After a long time of reciprocating friction, the sealing ring will gradually wear, resulting in gaps between the sealing ring and the plunger, affecting the sealing between the plunger and the cylinder. SUMMARY

[0004] In order to solve the above problems, the present application provides a wear-resistant reciprocating plunger pump with embedded multi-layer sealing ring structure, which comprises a cylinder and a plunger movably installed inside the cylinder, and further comprises a sealing unit one, the sealing unit one comprises a support ring one detachably installed in the inner wall of the cylinder, a plurality of sealing rings equally distributed left and right are installed on the right side of the support ring one, the sealing rings are sleeved on the outside of the plunger, a support assembly is installed inside the sealing ring for supporting it, and a compensation assembly is installed inside the cylinder for pushing the sealing ring.

[0005] A sealing unit two, the sealing unit two comprises a sealing ring two installed on the left end of the plunger, and a spreading assembly is installed on the plunger for pushing the sealing ring two to expand outward.

[0006] Among them, the spreading assembly comprises a plurality of sliding blocks circumferentially and uniformly slidingly installed on the left end of the plunger, an expanding plate is fixedly connected to one end of the sliding block away from the central axis of the plunger, the sealing ring two is embedded on the outside of the plurality of expanding plates, a wedge-shaped block two is slidingly installed inside the sliding block for pushing the sliding block to move away from the central axis of the plunger to expand the sealing ring two, and a moving assembly is installed on the plunger for driving the wedge-shaped block two to move to the right.

[0007] In a possible implementation, the right side of the sealing ring is provided with a groove, the wall thickness of the sealing ring on the inside of the groove is greater than the wall thickness on the outside of the groove, and the support assembly comprises a plurality of elastic supports which are uniformly installed in the inside of the groove.

[0008] In a possible implementation, the support assembly further comprises wedge-shaped blocks one which are fixedly installed on the opposite sides of the two horizontal segments of the elastic support, the right side of the groove is slidably provided with pushing rings, the left end of the pushing ring extends to the inside of the groove and is inserted between the upper and lower wedge-shaped blocks one, and the right end of each pushing ring except the rightmost pushing ring abuts against the left side of the adjacent sealing ring.

[0009] In a possible implementation, the compensation assembly comprises a support ring two which is movably installed on the inner wall of the cylinder body and located on the right side of the rightmost sealing ring, the right end of the rightmost pushing ring abuts against the left side of the support ring two, and the right side of the support ring two is provided with a pressing ring, and a compression spring is fixedly connected between the support ring two and the pressing ring and sleeved around the plunger.

[0010] In a possible implementation, the compensation assembly further comprises a limiting tube which is fixedly connected to the right side of the support ring two, the left side of the pressing ring is fixedly connected with a jacket, the jacket is movably sleeved on the outside of the limiting tube, a plurality of wedge-shaped grooves are equidistantly arranged on the outer ring wall of the limiting tube and inclined towards the direction of the central axis of the plunger, a plurality of wedge-shaped teeth are equidistantly arranged on the inner wall of the jacket and engaged with the wedge-shaped grooves, and a helical groove one is formed in the inner ring wall of the limiting tube.

[0011] In a possible implementation, the right side of the cylinder body is detachably provided with a sealing pressing cap which is sleeved around the plunger, a sealing ring one is embedded on the outer ring wall of the sealing pressing cap and used for sealing the gap between the sealing pressing cap and the inner wall of the cylinder body, and the right end of the pressing ring abuts against the left end of the sealing pressing cap.

[0012] In a possible implementation, the left end of the plunger is detachably provided with an end cover, the end cover is pressed against the left side of the sealing ring two, and the outer diameter of the end cover is the same as the outer diameter of the plunger.

[0013] In a possible implementation, the inside of the sliding block is provided with a wedge-shaped through groove, the right end of the wedge-shaped through groove is inclined towards the direction of the central axis of the plunger, the wedge-shaped blocks two are slidably matched with the wedge-shaped through groove, the right ends of the plurality of wedge-shaped blocks two penetrate into the inside of the plunger and are fixedly connected with a baffle, the baffle is slidably connected with the plunger, and a return spring is fixedly connected between the left side of the baffle and the inner wall of the plunger.

[0014] In a possible implementation manner, the moving assembly comprises a pull rod slidingly arranged inside the plunger, a left end of the pull rod is fixedly connected with the right side of the baffle, a right end of the pull rod is fixedly connected with a movable block, an outer rotating ring and an inner rotating ring located outside the movable block are rotatably arranged on an outer ring wall of the expansion assembly, the outer rotating ring is in screw thread cooperation with the screw groove one, the inner rotating ring is located inside the outer rotating ring and is in transmission connection with the outer rotating ring through a ratchet and pawl mechanism, and a screw groove two is arranged on an inner wall of the inner rotating ring.

[0015] The beneficial effects of the present application are as follows: 1. The present application sets a plurality of sealing rings on the inner wall of the cylinder body, seals the gap between the plunger and the cylinder body by the sealing ring, compensates the pushing force given by the compensation assembly to the sealing ring and the pushing ring to move left, makes the elastic support expand outward by the pushing wedge one when the pushing ring moves left, supports the support ring one outward by the elastic support, deforms the sealing ring to the direction close to the plunger central axis when the support ring one is worn, adaptively makes up the gap generated after the wear, makes the sealing ring always adhere to the plunger, and avoids the leakage.

[0016] 2. The present application sets the sealing ring two on the plunger, seals the gap between the plunger and the cylinder body by the sealing ring two, makes the wedge two move right relative to the plunger by the moving assembly when the plunger moves left, moves the sliding block and the expansion plate away from the plunger central axis by the wedge two, expands the sealing ring two outward by the expansion plate, makes up the gap generated after the wear of the sealing ring two, makes the sealing ring two always adhere to the inner wall of the cylinder body, and avoids the leakage. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a three-dimensional structure schematic diagram of the present application.

[0018] Figure 2 is a half cut structure schematic diagram of the present application.

[0019] Figure 3 is a plane structure schematic diagram of the sealing unit one of the present application.

[0020] Figure 4 is a three-dimensional structure schematic diagram of the sealing ring of the present application.

[0021] Figure 5 is a three-dimensional structure schematic diagram of the C-shaped frame of the present application.

[0022] Figure 6 is a three-dimensional structure schematic diagram of the compensation assembly of the present application.

[0023] Figure 7 is a plane structure schematic diagram of the sealing unit two of the present application.

[0024] Figure 8 is a schematic diagram of the half-section structure of the plunger of the present application.

[0025] Figure 9 is a schematic diagram of the perspective structure of the sliding block of the present application.

[0026] Figure 10 is a schematic diagram of the perspective structure of the moving assembly of the present application.

[0027] In the figure: 1, cylinder; 11, sealing pressure cap; 12, sealing ring one; 2, plunger; 21, end cover; 3, sealing unit one; 31, support ring one; 32, sealing ring; 33, support assembly; 331, elastic support; 332, wedge block one; 333, pushing ring; 34, compensation assembly; 341, support ring two; 342, pressing ring; 343, compression spring; 344, limiting tube; 345, clamping sleeve; 346, helical groove one; 4, sealing unit two; 41, sealing ring two; 42, expansion assembly; 421, sliding block; 422, expansion plate; 423, wedge block two; 424, wedge-shaped through groove; 425, baffle; 426, return spring; 43, moving assembly; 431, pull rod; 432, movable block; 433, outer rotating ring; 434, inner rotating ring; 435, helical groove two. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in combination with the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] Please refer to Figure 1 - Figure 10 A wear-resistant reciprocating plunger pump with an embedded multi-layer sealing ring structure comprises a cylinder 1 and a plunger 2 movably installed inside the cylinder 1, and further comprises a sealing unit one 3, the sealing unit one 3 comprising a support ring one 31 detachably installed in the inner wall of the cylinder 1, a plurality of sealing rings 32 equally distributed on the right side of the support ring one 31, the sealing rings 32 being sleeved on the outside of the plunger 2, and a support assembly 33 installed on the inside of the sealing rings 32 for supporting the sealing rings 32, and the inside of the cylinder 1 is further provided with a compensation assembly 34 for pushing the sealing rings 32.

[0030] A sealing unit two 4, the sealing unit two 4 comprising a sealing ring two 41 installed on the left end of the plunger 2, and the plunger 2 is provided with an expansion assembly 42 for pushing the sealing ring two 41 to expand outward.

[0031] The expansion assembly 42 comprises a plurality of sliding blocks 421 which are circumferentially and uniformly slidingly installed at the left end of the plunger 2, and the end of the sliding block 421 away from the central axis of the plunger 2 is fixedly connected with an expansion plate 422, the sealing ring two 41 is embedded outside the plurality of expansion plates 422, and the inside of the sliding block 421 is slidingly installed with a wedge-shaped block two 423 for pushing the sliding block 421 to move away from the central axis of the plunger 2 to expand the sealing ring two 41, and the plunger 2 is installed with a moving assembly 43 for driving the wedge-shaped block two 423 to move rightward.

[0032] In specific use, when the plunger 2 reciprocates leftward and rightward in the cylinder body 1, the gap between the plunger 2 and the cylinder body 1 is sealed by the sealing ring 32 and the sealing ring two 41, so that the plunger 2 can stably suck, discharge and transport the medium, and the medium cannot seep into other parts of the pump from the gap between the plunger 2 and the cylinder body 1, thereby avoiding pump failure and damage.

[0033] When the sealing ring 32 is worn due to the reciprocation of the plunger 2, the sealing ring 32 is given an axial pushing force to the left by the compensation assembly 34, so that the sealing ring 32 is deformed in the radial direction, and the sealing ring 32 is supported by the supporting assembly 33, so that the sealing ring 32 is deformed towards the central axis of the plunger 2, thereby making up for the gap caused by wear, and the sealing ring 32 can always adhere to the surface of the plunger 2, thereby avoiding the situation that the sealing effect of the sealing ring 32 is poor.

[0034] When the sealing ring two 41 is worn due to the reciprocation of the plunger 2, the wedge-shaped block two 423 is driven to move rightward by the moving assembly 43, so that the wedge-shaped block two 423 pushes the sliding block 421 and the expansion plate 422 to move away from the central axis of the plunger 2, the sealing ring two 41 is expanded outward by the expansion plate 422, so that the sealing ring two 41 always adheres to the inner wall of the cylinder body 1, and the sealing ring two 41 can be self-adaptively adjusted according to the wear condition, thereby improving the sealing effect between the plunger 2 and the cylinder body 1.

[0035] Please refer to Figure 3 , Figure 4 and Figure 5 , the right side of the sealing ring 32 is provided with a groove, the wall thickness of the sealing ring 32 inside the groove is greater than the wall thickness outside the groove, and the supporting assembly 33 comprises a plurality of elastic supports 331 which are circumferentially and uniformly installed inside the groove.

[0036] In specific use, the sealing ring 32 is elastically supported by the elastic supports 331, so that the sealing ring 32 has a tendency to deform towards the central axis of the plunger 2, and when the sealing ring 32 is worn, the sealing ring 32 can be self-adaptively adjusted to make up for the loss of wear, and since the wall thickness of the sealing ring 32 inside the groove is thicker, the wear resistance time is longer, and the wear resistance of the sealing ring 32 can be improved.

[0037] Please refer toFigure 3 , Figure 4 and Figure 5 The support assembly 33 also includes a wedge-shaped block 332 fixedly installed on both sides of the two horizontal sections of the elastic bracket 331. A push ring 333 is slidably installed on the right side of the groove. The left end of the push ring 333 extends into the inside of the groove and is inserted between the upper and lower wedge-shaped blocks 332. Except for the rightmost push ring 333, the right ends of the other push rings 333 abut against the left side of the adjacent sealing ring 32.

[0038] Please see Figure 3 and Figure 6 The compensation component 34 includes a second support ring 341 that is movably mounted on the inner wall of the cylinder 1 and located to the right of the rightmost sealing ring 32. The right end of the rightmost pushing ring 333 abuts against the left side of the second support ring 341. A pressure ring 342 is installed on the right side of the second support ring 341. A compression spring 343, which is sleeved on the outside of the plunger 2, is fixedly connected between the second support ring 341 and the pressure ring 342.

[0039] In practical use, the compression spring 343 provides elastic force to the second support ring 341 to move to the left, giving the second support ring 341 a tendency to move to the left. When the sealing ring 32 wears, the second support ring 341 pushes the sealing ring 32 to the left, allowing the sealing ring 32 to deform towards the central axis of the plunger 2. While the second support ring 341 pushes the sealing ring 32 to the left, the sealing ring 32 contracts in the left and right direction. The second support ring 341 and the sealing ring 32 will push the corresponding pushing ring 333 to the left, allowing the pushing ring 333 to further insert into the two corresponding wedge blocks 332. The pushing ring 333 pushes the two corresponding wedge blocks 332 away from each other, which can promote the support of the elastic bracket 331 for the sealing ring 32, allowing the sealing ring 32 to deform towards the central axis of the plunger 2 when worn.

[0040] Please see Figure 3 and Figure 6 The compensation component 34 also includes a limiting tube 344 fixedly connected to the right side of the support ring 341. A sleeve 345 is fixedly connected to the left side of the pressure ring 342. The sleeve 345 is movably fitted around the outside of the limiting tube 344. Several wedge-shaped grooves are evenly distributed on the outer ring wall of the limiting tube 344. The left end of the wedge-shaped groove is inclined towards the central axis of the plunger 2. Several wedge-shaped teeth are evenly distributed on the inner wall of the sleeve 345. The wedge-shaped grooves and wedge-shaped teeth mesh with each other. A spiral groove 346 is formed on the inner ring wall of the limiting tube 344.

[0041] In practical use, when the compression spring 343 pushes the support ring 341 to move to the left, the support ring 341 drives the limiting tube 344 to move to the left as well. At this time, the limiting tube 344 slides to the left relative to the jacket 345. When the limiting tube 344 moves to the left, the wedge groove and the wedge teeth will be misaligned. At this time, the wedge groove is used to push the wedge teeth to move away from the central axis of the plunger 2, so that the jacket 345 will undergo a certain degree of outward deformation, ensuring that the limiting tube 344 moves smoothly to the left. When aligned with the wedge teeth again, the sleeve 345 can drive the wedge teeth to mesh with the wedge groove again. However, when the plunger 2 moves to the right, the plunger 2 will give the support ring 341 and the limiting tube 344 a frictional force to move to the right. At this time, the mutual meshing of the wedge groove and the wedge teeth will limit the limiting tube 344, preventing the support ring 341 and the limiting tube 344 from moving to the right, thereby ensuring that the support ring 341 can continuously squeeze the sealing ring 32 and prevent the sealing ring 32 from separating from the surface of the plunger 2.

[0042] Please see Figure 2 and Figure 3 A sealing cap 11 is detachably installed on the right side of the cylinder body 1 and sleeved on the outside of the plunger 2. The sealing cap 11 is fixed to the cylinder body 1 by bolts. A sealing ring 12 is embedded on the outer ring wall of the sealing cap 11 to seal the gap between the sealing cap 11 and the inner wall of the cylinder body 1. The right end of the pressure ring 342 abuts against the left end of the sealing cap 11.

[0043] In practical use, after installing the support ring 31, sealing ring 32, support assembly 33, compensation assembly 34, and plunger 2 into the cylinder body 1, the sealing cap 11 is inserted into the right end of the cylinder body 1, and then the sealing cap 11 is fixed with bolts. The sealing cap 11 seals the support ring 31, sealing ring 32, support assembly 33, and compensation assembly 34 to prevent them from falling off. At the same time, the sealing cap 11 supports the plunger 2, ensuring the stability of the plunger 2 in the cylinder body 1. The sealing ring 12 can seal the gap between the sealing cap 11 and the cylinder body 1, improving the sealing effect when the sealing cap 11 is assembled with the cylinder body 1.

[0044] Please see Figure 2 and Figure 7 An end cap 21 is detachably installed on the left end of the plunger 2. The end cap 21 is fixed to the plunger 2 by bolts. The end cap 21 is pressed against the left side of the sealing ring 41. The outer diameter of the end cap 21 is the same as the outer diameter of the plunger 2.

[0045] In practical use, the end cap 21 is installed in a detachable manner, which facilitates the installation of the sliding block 421, the expansion plate 422, the second wedge block 423, and the second sealing ring 41. After the sliding block 421, the expansion plate 422, the second wedge block 423, and the second sealing ring 41 are installed, the end cap 21 is installed on the left side of the second sealing ring 41. The end cap 21 covers the second sealing ring 41 and the expansion assembly 42, preventing the expansion assembly 42 from directly contacting the medium. The second sealing ring 41 seals the gap between the plunger 2 and the end cap 21, preventing the transported medium from entering between the plunger 2 and the end cap 21, and ensuring the normal operation of the sliding block 421, the expansion plate 422, and the second wedge block 423.

[0046] Please see Figure 7 , Figure 8 and Figure 9 The sliding block 421 has a wedge-shaped through groove 424 inside. The right end of the wedge-shaped through groove 424 is inclined towards the central axis of the plunger 2. The second wedge block 423 is slidably engaged with the wedge-shaped through groove 424. The right ends of several second wedge blocks 423 penetrate into the interior of the plunger 2 and are fixedly connected to a baffle 425. The baffle 425 is slidably connected to the plunger 2 from left to right. A return spring 426 is fixedly connected between the left side of the baffle 425 and the inner wall of the plunger 2.

[0047] In practical use, the return spring 426 provides elastic force to the baffle 425 to move to the right, giving the baffle 425 a tendency to move to the right. When the sealing ring 41 wears, the baffle 425 drives the wedge block 423 to move to the right, causing the wedge block 423 to slide to the right in the wedge groove 424. Through the mutual cooperation of the wedge block 423 and the wedge groove 424, the sliding block 421 and the expansion plate 422 are pushed to move away from the central axis of the plunger 2. The expansion plate 422 expands the sealing ring 41 outward, so that the sealing ring 41 can always be in contact with the inner wall of the cylinder 1, ensuring the sealing effect of the sealing ring 41.

[0048] Please see Figure 7 , Figure 8 , Figure 9 and Figure 10 The moving component 43 includes a pull rod 431 that is slidably installed inside the plunger 2. The left end of the pull rod 431 is fixedly connected to the right side of the baffle 425, and the right end of the pull rod 431 is fixedly connected to a movable block 432. An outer rotating ring 433 and an inner rotating ring 434 located outside the movable block 432 are rotatably installed on the outer ring wall of the expansion component 42. The outer rotating ring 433 is threadedly engaged with the spiral groove 346. The inner rotating ring 434 is located inside the outer rotating ring 433, and the two are connected by a ratchet and pawl mechanism. When the outer rotating ring 433 rotates counterclockwise, it drives the inner rotating ring 434 to rotate. A second threaded groove 435 is provided on the inner wall of the inner rotating ring 434. The end of the movable block 432 away from the central axis of the plunger 2 is threadedly engaged with the second threaded groove 435.

[0049] In practical use, when the plunger 2 slides to the left, the plunger 2 drives the outer rotating ring 433 to move to the left. The spiral groove 346 drives the outer rotating ring 433 to rotate counterclockwise. The outer rotating ring 433 drives the inner rotating ring 434 to rotate through the ratchet and pawl mechanism. When the inner rotating ring 434 rotates, it drives the movable block 432 to move slowly to the right through the threaded groove 435. The movable block 432 pulls the baffle 425 to move to the right through the pull rod 431, so that the wedge block 423 can push the sliding block 421 away from the central axis of the plunger 2. This makes it easier for the sealing ring 41 to automatically expand outward with the reciprocating movement of the plunger 2, thus compensating for the wear caused by wear.

[0050] By providing a spiral groove 346 on the inner side of the limiting tube 344, when the plunger 2 moves to the left, the inner rotating ring 434 can provide a thrust to the limiting tube 344 to move to the left, which can promote the limiting tube 344 and the second support ring 341 to move to the left, so that the second support ring 341 can push the sealing ring 32 to the left, promote the deformation of the sealing ring 32 towards the central axis of the plunger 2, and facilitate the compensation for the wear caused by the sealing ring 32.

[0051] When the plunger 2 slides to the right, the plunger 2 drives the outer rotating ring 433 to move to the right. The spiral groove 346 drives the outer rotating ring 433 to rotate clockwise. At this time, the outer rotating ring 433 cannot drive the inner rotating ring 434 to rotate through the ratchet and pawl mechanism, thus preventing the moving block 432 from rotating in the opposite direction and preventing the sealing ring 41 from contracting towards the central axis of the plunger 2.

[0052] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A wear-resistant reciprocating plunger pump with embedded multi-layer sealing ring structure, comprising a cylinder body (1) and a plunger (2) movably mounted inside the cylinder body (1), characterized in that, Also include: The sealing unit one (3) includes a support ring one (31) which is detachably installed in the inner wall of the cylinder body (1), a plurality of left and right equidistantly distributed sealing rings (32) are installed on the right side of the support ring one (31), the sealing ring (32) is sleeved on the outside of the plunger (2), the inside of the sealing ring (32) is provided with a support assembly (33) for supporting it, and the inside of the cylinder body (1) is also provided with a compensation assembly (34) for pushing the sealing ring (32); The sealing unit two (4) includes a sealing ring two (41) installed on the left end of the plunger (2), and a spreading assembly (42) is installed on the plunger (2) for pushing the sealing ring two (41) to expand outwardly; Wherein, the spreading assembly (42) includes a plurality of sliding blocks (421) which are circumferentially and uniformly slidably installed on the left end of the plunger (2), one end of the sliding block (421) away from the central axis of the plunger (2) is fixedly connected with a spreading plate (422), the sealing ring two (41) is embedded on the outside of a plurality of spreading plates (422), the inside of the sliding block (421) is slidably installed with a wedge-shaped block two (423) for pushing the sliding block (421) to move away from the central axis of the plunger (2) to expand the sealing ring two (41), and the plunger (2) is provided with a moving assembly (43) for driving the wedge-shaped block two (423) to move rightward.

2. A wear resistant reciprocating plunger pump with an embedded multi-layer seal ring structure as claimed in claim 1, wherein: The right side of the sealing ring (32) is provided with a groove, the wall thickness of the sealing ring (32) on the inside of the groove is greater than that on the outside of the groove, and the support assembly (33) includes a plurality of elastic supports (331) which are circumferentially and uniformly installed in the inside of the groove.

3. A wear resistant reciprocating plunger pump with an embedded multi-layer seal ring structure as claimed in claim 2, wherein: The support assembly (33) further includes a wedge-shaped block one (332) fixedly installed on the opposite side of the two horizontal sections of the elastic support (331), the right side of the groove is slidably installed with a pushing ring (333), the left end of the pushing ring (333) extends to the inside of the groove and is inserted between the upper and lower wedge-shaped blocks one (332), and the right end of the pushing ring (333) except the rightmost pushing ring (333) abuts against the left side of the adjacent sealing ring (32).

4. A wear resistant reciprocating plunger pump with an embedded multi-layer seal ring structure according to claim 3, characterized in that: The compensation assembly (34) includes a support ring two (341) which is movably installed on the inner wall of the cylinder body (1) and located on the right side of the rightmost sealing ring (32), the right end of the rightmost pushing ring (333) abuts against the left side of the support ring two (341), the right side of the support ring two (341) is installed with a pressing ring (342), and the support ring two (341) and the pressing ring (342) are fixedly connected with a compression spring (343) which is sleeved on the outside of the plunger (2).

5. A wear resistant reciprocating plunger pump with an embedded multi-layer seal ring structure according to claim 4, characterized in that: The compensation assembly (34) further comprises a limiting tube (344) fixedly connected to the right side of the second support ring (341), and the left side of the compression ring (342) is fixedly connected with a jacket (345), the jacket (345) is movably sleeved on the outside of the limiting tube (344), a plurality of wedge-shaped grooves are formed in the outer ring wall of the limiting tube (344) and are equidistantly distributed left and right, the left end of the wedge-shaped groove is inclined towards the direction close to the central axis of the plunger (2), a plurality of wedge-shaped teeth are fixedly connected to the inner wall of the jacket (345) and are equidistantly distributed left and right, the wedge-shaped groove is engaged with the wedge-shaped teeth, and a helical groove (346) is formed in the inner ring wall of the limiting tube (344).

6. A wear resistant reciprocating plunger pump with an embedded multi-layer seal ring structure as claimed in claim 4, wherein: The right side of the cylinder body (1) is detachably connected with a sealing compression cap (11) sleeved on the outside of the plunger (2), a sealing ring (12) for sealing the gap between the sealing compression cap (11) and the inner wall of the cylinder body (1) is embedded in the outer ring wall of the sealing compression cap (11), and the right end of the compression ring (342) abuts against the left end of the sealing compression cap (11).

7. A wear resistant reciprocating plunger pump with an embedded multi-layer seal ring structure as claimed in claim 1, wherein: The left end of the plunger (2) is detachably connected with an end cover (21), the end cover (21) is pressed on the left side of the sealing ring (41), and the outer diameter of the end cover (21) is the same as the outer diameter of the plunger (2).

8. A wear resistant reciprocating plunger pump with an embedded multi-layer seal ring structure as claimed in claim 1, wherein: The inside of the sliding block (421) is provided with a wedge-shaped through groove (424), the right end of the wedge-shaped through groove (424) is inclined towards the direction close to the central axis of the plunger (2), the wedge-shaped block (423) is in sliding fit with the wedge-shaped through groove (424), the right ends of the plurality of wedge-shaped blocks (423) penetrate into the inside of the plunger (2) and are fixedly connected with a baffle (425), the baffle (425) is in sliding connection with the plunger (2), and the left side of the baffle (425) is fixedly connected with a return spring (426) between the inner wall of the plunger (2).

9. A wear resistant reciprocating plunger pump with an embedded multi-layer seal ring structure according to claim 8, characterized in that: The moving assembly (43) comprises a pull rod (431) slidably installed in the inside of the plunger (2), the left end of the pull rod (431) is fixedly connected with the right side of the baffle (425), the right end of the pull rod (431) is fixedly connected with a movable block (432), the outer turning ring (433) and the inner turning ring (434) located outside the movable block (432) are rotatably installed on the outer ring wall of the expansion assembly (42), the outer turning ring (433) is in screw thread fit with the helical groove (346), the inner turning ring (434) is located inside the outer turning ring (433) and is in transmission connection with the outer turning ring (433) through a ratchet and pawl mechanism, a threaded groove (435) is formed in the inner wall of the inner turning ring (434), and the end of the movable block (432) away from the central axis of the plunger (2) is in screw thread fit with the threaded groove (435).

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