A sealing assembly for a plunger pump

Abstract

The present application discloses a sealing assembly for a plunger pump, and relates to the technical field of plunger pump sealing. The present application includes a plunger pump, wherein the plunger pump has a plunger and a cylinder body, wherein the plunger is movably inserted in the cylinder body, and further includes: a mounting plate, wherein the mounting plate is mounted on one end of the plunger located in the cylinder body, and a plurality of sliding arc plates are slidably mounted in a circular array on the mounting plate, wherein the sliding arc plates slide in a direction toward the axis of the mounting plate, and arc-shaped mounting grooves are provided on the outer peripheral side of the sliding arc plates, and further includes sealing rubber rings clamped on the plurality of sliding arc plates through the plurality of arc-shaped mounting grooves. The present application provides a clamping force in a direction away from the axis of the plunger to the plurality of sliding arc plates through an opening mechanism, so that the sealing rubber rings always contact the cylinder body, so that when the piston pump reciprocates and causes the sealing rubber rings to wear, the sealing rubber rings always maintain a good resistance force with the outer peripheral side of the cylinder body, thereby improving the service life of the sealing rubber rings.

Description

Technical Field

[0001] The present application relates to the technical field of plunger pump seals, and in particular to a sealing assembly for a plunger pump. Background Art

[0002] The pump is one of the essential components in the hydraulic system. Some common pumps include piston pumps, centrifugal pumps, plunger pumps, etc. Among them, plunger pumps are often used in environments with high pressure, large flow and flow that needs to be adjusted.

[0003] When pumping oil, the existing plunger pump uses multiple plungers to move back and forth in the inner cavity of the cylinder to pump and push liquid, thereby achieving the effect of pressurization. However, in order to prevent oil leakage during the reciprocating movement of the plunger pump, a sealing ring is generally installed on the plunger to improve the sealing performance. However, the plunger and the cylinder of the existing plunger pump are only sealed by a single sealing ring. The sealing ring is prone to wear during the movement of the plunger, resulting in a gradual deterioration of the sealing effect, which makes it easy for oil leakage to occur between the plunger and the cylinder. Summary of the Invention

[0004] The purpose of this application is to solve the problems raised by the above background technology, and this application provides a sealing assembly for a plunger pump.

[0005] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0006] A sealing assembly for a plunger pump includes a plunger pump having a plunger and a cylinder, wherein the plunger is movably inserted in the cylinder, and further includes:

[0007] A mounting plate, the mounting plate being mounted on one end of the plunger located within the cylinder body, the mounting plate being slidably mounted with a plurality of sliding arc plates in a circular array, the sliding arc plates sliding in a direction toward the axis of the mounting plate, the sliding arc plates being provided with arc-shaped mounting grooves on their outer circumferences, and further comprising sealing rubber rings clamped on the plurality of sliding arc plates through the plurality of arc-shaped mounting grooves;

[0008] The expansion mechanism is installed on the mounting plate and acts on the multiple sliding arc plates. When the hydraulic oil enters the cylinder body, the expansion mechanism provides a clamping force away from the axis of the mounting plate to the multiple sliding arc plates, so that the outer peripheral side of the sealing rubber ring contacts the inner peripheral wall of the cylinder body.

[0009] Furthermore, the expansion mechanism includes a mounting rod coaxially constructed on the end face of the mounting plate, a sliding plate is slidably sleeved on the mounting rod, a convex plate is constructed on the side of the sliding plate close to the sliding arc plate, and a first connecting rod is hinged between the convex plate and the sliding arc plate.

[0010] Furthermore, shift grooves are provided on both end faces of the sliding arc plate, and an arc-shaped push plate is movably arranged between adjacent shift grooves. The arc-shaped push plate is slidably installed on the mounting plate, and the sliding direction is toward the axial direction of the mounting plate. A second connecting rod is hinged between the arc-shaped push plate and the sliding plate, and a card slot is provided on the outer peripheral side of the arc-shaped push plate, which is used to clamp the sealing rubber ring.

[0011] Furthermore, the sliding plate is provided with an installation cavity, the sliding plate is provided with a protrusion located in the installation cavity, a driving plate is slidably installed in the installation cavity, a wedge block is provided at one end of the driving plate close to the installation rod, a plurality of wedge-shaped grooves for inserting the wedge blocks are provided on one side of the installation rod along its length direction, an interfering spring piece is installed between the driving plate and the protrusion, and a shielding sleeve for shielding the wedge groove is provided at the inner edges of both ends of the sliding plate.

[0012] Furthermore, a blocking plate for blocking an opening on one side of the installation cavity is installed on the sliding plate, and a connecting plate slidably connected to the driving plate is constructed on a side of the blocking plate close to the installation cavity.

[0013] Furthermore, a thread is provided on the outer peripheral side of the shielding sleeve away from the sealing rubber ring, and the movable sleeve on the mounting rod is provided with a push plate that cooperates with the thread of the shielding sleeve. A tightening spring is connected between the push plate and the shielding sleeve, and an annular groove is provided on the outer peripheral side of the push plate, and a sealing ring is installed in the annular groove.

[0014] Furthermore, a plurality of sliding grooves connected to the annular groove are provided in a circular array inside the push plate, and the axial direction of the sliding groove is toward the axis of the push plate. An oil inlet groove connected to the sliding groove is provided on the push plate, and a movable plate is slidably installed in the sliding groove. One end of the movable plate is located in the annular groove and is constructed with an arc plate, and the outer peripheral side of the arc plate is in contact with the inner peripheral side of the sealing ring.

[0015] Furthermore, a sleeve for covering the oil inlet groove is installed on the push plate, an oil inlet hole is opened at one end of the sleeve, a baffle for covering the oil inlet hole is slidably installed inside the sleeve, a gap is left between the outer peripheral side of the baffle and the inner peripheral side of the sleeve, and a resistance spring is installed between the baffle and the sleeve.

[0016] Furthermore, a rectangular groove is provided at the end of the plunger, a rectangular block is constructed on the mounting plate and is tightly inserted into the rectangular groove, a plug-in groove connected to the rectangular groove is symmetrically provided on the plunger, a positioning groove is provided on the rectangular block, a positioning plate for being inserted into the positioning groove is slidably inserted in the plug-in groove, threaded holes are symmetrically provided on the plunger, a through hole coaxial with the threaded hole is provided on the positioning plate, and a bolt is screwed into the threaded hole and passes through the through hole.

[0017] Furthermore, the positioning plate and the plug-in slot are both in the shape of a right-angled triangle, one side of the positioning plate is configured as an arc-shaped surface, and the arc-shaped surface smoothly transitions to the outer peripheral side of the plunger.

[0018] The beneficial effects of this application are as follows:

[0019] The present application provides a clamping force in a direction away from the plunger axis to multiple sliding arc plates through a spreading mechanism, so that the sealing rubber ring always contacts the cylinder body. When the piston pump moves back and forth and causes the sealing rubber ring to wear, the sealing rubber ring always maintains a good resistance force with the outer peripheral side of the cylinder body, thereby improving the service life of the sealing rubber ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of this application;

[0021] Figure 2 It is a schematic diagram of the structure of part of this application;

[0022] Figure 3 This is another structural diagram of this application;

[0023] Figure 4 This application Figure 3 Partial stereoscopic cross-sectional view;

[0024] Figure 5 This application Figure 4 Another partial perspective cutaway view;

[0025] Figure 6 This application Figure 4 Another partial perspective cutaway view;

[0026] Figure 7 It is an exploded view of part of the structure of this application;

[0027] Figure 8 This is another exploded view of the structure of this application;

[0028] Figure 9 It is an exploded view of another part of the structure of this application;

[0029] Reference numerals: 1, plunger; 2, cylinder; 3, mounting plate; 4, sliding arc plate; 5, arc-shaped mounting groove; 6, expansion mechanism; 601, mounting rod; 602, sliding plate; 603, convex plate; 604, first connecting rod; 7, sealing rubber ring; 8, shifting groove; 9, arc-shaped push plate; 10, second connecting rod; 11, card slot; 12, mounting cavity; 13, convex block; 14, driving plate; 15, wedge block; 16, wedge groove; 17, resisting spring piece; 1 8. Sealing plate; 19. Connecting plate; 20. Shielding sleeve; 21. Pushing plate; 22. Retaining spring; 23. Annular groove; 24. Sliding groove; 25. Oil inlet groove; 26. Moving plate; 27. Arc plate; 28. Sleeve; 29. Oil inlet hole; 30. Shielding plate; 31. Retaining spring; 32. Rectangular groove; 33. Rectangular block; 34. Plug-in groove; 35. Positioning groove; 36. Positioning plate; 37. Threaded hole; 38. Through hole; 39. Sealing ring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0031] like Figures 1-9 As shown, a sealing assembly of a plunger pump proposed in one embodiment of the present application includes a plunger pump 1, which has a plunger 1 and a cylinder 2. The plunger 1 is movably inserted in the cylinder 2. Specifically, the cylinder 2 has six cylindrical plunger grooves, and the number of plungers 1 is six and they are slidably inserted in the six plunger grooves respectively, and further includes:

[0032] A mounting plate 3 is mounted on one end of the plunger 1 located within the cylinder body 2. A plurality of sliding arc plates 4 are slidably mounted in a circular array on the mounting plate 3. The sliding arc plates 4 slide in a direction toward the axis of the mounting plate 3. Arc-shaped mounting grooves 5 are formed on the outer circumference of the sliding arc plates 4. Sealing rubber rings 7 are also provided that are clamped onto the plurality of sliding arc plates 4 through the plurality of arc-shaped mounting grooves 5.

[0033] The expansion mechanism 6 is installed on the mounting plate 3 and acts on multiple sliding arc plates 4. When the hydraulic oil enters the cylinder body 2, the expansion mechanism 6 provides a clamping force to the multiple sliding arc plates 4 away from the axial direction of the mounting plate 3, so as to form a sealing rubber ring 7. The outer peripheral side contacts the inner peripheral wall of the cylinder body 2. That is to say, when the multiple pistons 1 move back and forth in the cylinder body 2, because one end of the piston 1 is installed with the mounting plate 3, and the multiple sliding arc plates 4 on the mounting plate 3 are clamped with the sealing rubber ring 7, the sealing rubber ring 7 will also move with the piston 1 during the movement. At this time, the sealing rubber ring 7 contacts the cylinder body 2. It should be noted that through Multiple sliding arc plates 4 make the outer peripheral side of the sealing rubber ring 7 contact with the cylinder body 2 and partially located inside the sliding arc plates 4. At this time, the position of the sealing rubber ring 7 is consistent with the effect of the sealing ring on the existing plunger 1. During the movement of the plunger 1, the expansion mechanism 6 provides a clamping force away from the axis direction of the plunger 1 to the multiple sliding arc plates 4, so that the sealing rubber ring 7 always contacts the cylinder body 2. When the piston 1 moves back and forth and causes the sealing rubber ring 7 to wear, the sealing rubber ring 7 always maintains a good resistance force with the outer peripheral side of the cylinder body 2, thereby increasing the service life of the sealing rubber ring 7 and cooperating with the existing sealing ring on the plunger 1 to improve the sealing effect.

[0034] like Figure 3 and Figure 9As shown, in some embodiments, the expansion mechanism 6 includes a mounting rod 601 coaxially constructed on the end face of the mounting plate 3, and a sliding plate 602 is slidably sleeved on the mounting rod 601, and a convex plate 603 is constructed on the side of the sliding plate 602 close to the sliding arc plate 4, and a first connecting rod 604 is hinged between the convex plate 603 and the sliding arc plate 4. That is to say, each time the plunger 1 moves in the cylinder body 2 and pushes the hydraulic oil in the cylinder body 2, the hydraulic oil in the cylinder body 2 will be squeezed out from the plunger groove of the cylinder body 2, and the hydraulic oil will provide a driving force for the sliding, so that the hydraulic oil will push the sliding plate 602 to move in the direction close to the corresponding plunger 1. Because the sliding plate 602 is hinged to the first connecting rod 604, and the other end of the first connecting rod 604 is hinged to the sliding arc plate 4, the sliding plate 602 will move in the direction away from the axis of the plunger 1 through the first connecting rod 604 during the movement, so that the multiple sliding arc plates 4 provide the sealing rubber ring 7 with a force away from the plunger. The clamping force in the axial direction of the plug 1 is applied to ensure that each time the hydraulic oil in the plunger groove is pushed out due to the movement of the plunger 1, the sealing rubber ring 7 will be pressed into the plunger groove due to the force provided by the sliding plate 602 of the hydraulic oil tank to prevent the friction between the sealing rubber ring 7 and the cylinder body 2 from decreasing due to the wear of the sealing rubber ring 7, thereby improving the sealing effect, and the reaction force formed by pushing the hydraulic oil causes the sliding plate 602 to move, and cooperates with the first connecting rod 604 to make the multiple sliding arc plates 4 move away from each other, so that the sealing ring 39 is more evenly stressed when it is stretched open by the multiple sliding arc plates 4. Preferably, the number of sliding arc plates 4 is four, and in this embodiment, the two ends of adjacent sliding arc plates 4 can fit together. When the multiple sliding arc plates 4 move away from each other after the sliding plate 602 is subjected to force, a certain gap will be generated between the adjacent sliding arc plates 4, thereby increasing the force area of the sealing rubber ring 7, thereby further improving the sealing effect.

[0035] like Figure 3 and Figure 9As shown, in some embodiments, the two end surfaces of the sliding arc plate 4 are provided with shift grooves 8, and an arc-shaped push plate 9 is movably provided between the adjacent shift grooves 8. The arc-shaped push plate 9 is slidably installed on the mounting plate 3, and the sliding direction is toward the axial direction of the mounting plate 3. A second connecting rod 10 is hinged between the arc-shaped push plate 9 and the sliding plate 602. A card groove 11 is provided on the outer peripheral side of the arc-shaped push plate 9, which is used to clamp the sealing rubber ring 7. Specifically, the number of convex plates 603 on the sliding plate 602 is equal to the sum of the number of arc-shaped push plates 9 and the sliding arc plate 4. That is to say, the second connecting rod 10 is also hinged. The two planes of the sliding arc plate 4 are fitted with the shift groove 8 and the card groove 11 inside the sliding slide plate forms a circular groove with the arc-shaped mounting groove 5. When the sliding plate 602 moves, the arc-shaped push plates 9 are moved away from each other through the second connecting rod 10. At this time, the corresponding sliding arc plates 4 are also moved away from each other through the first connecting rod 604, which increases the force-bearing area of the inner ring of the sealing rubber ring 7 and makes the corresponding sealing rubber ring 7 more evenly stressed, indirectly improving the interference effect between the outer ring of the sealing rubber ring 7 and the plunger groove.

[0036] like Figure 3 、 Figure 5 and Figure 9As shown, in some embodiments, when the plunger 1 moves in the plunger groove to pump oil, the negative pressure will cause the sliding plate 602 to move in the direction away from the corresponding plunger 1, so that the sliding arc plate 4 and the arc push plate 9 will be close to each other through the first connecting rod 604 and the second connecting rod 10, thereby reducing the sealing effect between the sealing rubber ring 7 and the plunger groove of the cylinder body 2. In order to prevent this from happening, a mounting cavity 12 is constructed on the sliding plate 602, and a protrusion 13 is constructed on the sliding plate 602 and located in the mounting cavity 12. A driving plate 14 is slidably installed in the mounting cavity 12, and a wedge block 15 is constructed on one end of the driving plate 14 close to the mounting rod 601. A plurality of wedge grooves 16 for inserting the wedge blocks 15 are opened on one side of the mounting rod 601 along its length direction. A resisting spring piece 17 is installed between the driving plate 14 and the protrusion 13, and a shielding sleeve 20 for blocking the wedge groove 16 is constructed at the inner edge of both ends of the sliding plate 602. When the plunger 1 moves in the cylinder 2 to pump oil, the primary plane of the wedge block 15 will come into contact with the plane of one of the wedge grooves 16, so that the sliding plate 602 will not move. Only when the plunger 1 moves in the cylinder 2 to push the hydraulic oil in the corresponding plunger groove, when the sliding plate 602 moves in the direction of the plunger 1, the inclined surface of the wedge block 15 will gradually increase because of the interference force between the inclined surface of the wedge block 15 and the inclined surface in the wedge groove 16, thereby causing the wedge block 15 to disengage from the corresponding wedge groove 16 until the sliding plate 602 moves into the other wedge groove 16. That is to say, through the interference spring piece 17, the drive plate 14 and the wedge block 15 constructed on the drive plate 14, the wedge groove 16 makes the sliding plate 602 can only move in the direction close to the plunger 1, thereby making the arc push plate 9 and the sliding arc plate 4 can only move in the direction away from the corresponding plunger 1 axis, so that the sealing rubber ring 7 always forms a conflict with the cylinder 2.

[0037] like Figure 3 、 Figure 4 、 Figure 5 and Figure 9 As shown, in some embodiments, a blocking plate 18 for blocking an opening on one side of the installation cavity 12 is installed on the sliding plate 602. Specifically, the blocking plate 18 is installed on the sliding plate 602 by bolts. The side of the blocking plate 18 close to the installation cavity 12 is constructed with a connecting plate 19 that is slidably connected to the drive plate 14. The design of the blocking plate 18 can prevent hydraulic oil from entering the installation cavity 12. When the sealing rubber ring 7 needs to be removed later, in order to facilitate disassembly, the bolts on the blocking plate 18 can be removed and the blocking plate 18 can be pulled. When the blocking plate 18 is pulled to a certain extent, the blocking plate 18 continues to move, which will drive the drive plate 14 to move. The drive plate 14 moves to move the wedge block 15 constructed on the drive plate 14, thereby disengaging the wedge block 15 from the wedge groove 16, so that the sliding plate 602 can move in a direction away from the corresponding plunger 1, which is convenient for the subsequent replacement of the sealing rubber ring 7.

[0038] like Figure 3 、 Figure 4 、 Figure 8 and Figure 9 As shown, in some embodiments, a thread is provided on the outer peripheral side of the shielding sleeve 20 away from the sealing rubber ring 7, and a movable sleeve on the mounting rod 601 is provided with a push plate 21 that is threadedly matched with the shielding sleeve 20, and a tightening spring 22 is connected between the push plate 21 and the shielding sleeve 20, and an annular groove 23 is provided on the outer peripheral side of the push plate 21, and a sealing ring 39 is sleeved in the annular groove 23. After the push plate 21 is tightened on the shielding sleeve 20, the resistance spring 31 is in a compressed state, thereby preventing the push plate 21 from loosening after tightening. The sealing ring 39 in the annular groove 23 of the push plate 21 contacts the plunger groove, so that when the plunger 1 moves to push oil, the hydraulic oil is not easy to pass through the push plate 21, thereby increasing the force provided by the hydraulic oil to the push plate 21, so that the push plate 21 is subjected to as large a force as possible, thereby indirectly increasing the moving stroke of the sliding plate 602, and indirectly improving the resistance effect between the sealing rubber ring 7 and the cylinder body 2.

[0039] like Figure 4 and Figure 6 As shown, in some embodiments, a plurality of sliding grooves 24 connected to the annular groove 23 are provided in a circular array inside the push plate 21, and the axial direction of the sliding groove 24 is toward the axis of the push plate 21. An oil inlet groove 25 connected to the sliding groove 24 is provided on the push plate 21, and a movable plate 26 is slidably installed in the sliding groove 24. One end of the movable plate 26 is located in the annular groove 23 and is constructed with an arc plate 27. The outer peripheral side of the arc plate 27 contacts the inner peripheral side of the sealing ring 39. That is to say, when the push plate 21 squeezes the hydraulic oil in the plunger groove, part of the hydraulic oil will enter the oil inlet groove 25, thereby causing the hydraulic oil to enter the sliding groove 24 and causing the movable plate 26 to move away from the push plate 21, thereby causing the arc plate 27 to push the sealing ring 39 to move, causing the sealing ring 39 to contact the inner peripheral side of the plunger groove, indirectly improving the sealing effect of the push plate 21.

[0040] like Figure 4 and Figure 8As shown, in some embodiments, a sleeve 28 for blocking the oil inlet groove 25 is installed on the push plate 21, that is, the sleeve 28 is connected to the oil inlet groove 25, an oil inlet hole 29 is opened at one end of the sleeve 28, and a baffle 30 for blocking the oil inlet hole 29 is slidably installed inside the sleeve 28, and a gap is left between the outer peripheral side of the baffle 30 and the inner peripheral side of the sleeve 28, and a resistance spring 31 is installed between the baffle 30 and the sleeve 28, that is, when the push plate 21 moves to squeeze the hydraulic oil, the hydraulic oil enters the oil inlet hole 29, which pushes the baffle 30 to move, so that the hydraulic oil passes through The movable plate 26 is pressed against the piston 1 and the piston 12 is pressed against the piston 13. The piston 12 is pressed against the piston 13 and the piston 12 is pressed against the piston 13. The piston 12 is pressed against the piston 13 and the piston 12 is pressed against the piston 13.

[0041] like Figure 7-Figure 9 As shown, in some embodiments, a rectangular groove 32 is provided at the end of the plunger 1, and a rectangular block 33 is constructed on the mounting plate 3 to be tightly inserted into the rectangular groove 32. A plug-in groove 34 connected to the rectangular groove 32 is symmetrically provided on the plunger 1, and a positioning groove 35 is provided on the rectangular block 33. A positioning plate 36 for being inserted into the positioning groove 35 is slidably inserted in the plug-in groove 34. A threaded hole 37 is symmetrically provided on the plunger 1, and a through hole 38 coaxial with the threaded hole 37 is provided on the positioning plate 36. The bolt is screwed into the threaded hole 37 and passes through the through hole 38. In other words, the mounting plate 3 can be removed from the plunger 1 to facilitate subsequent replacement. The design of the rectangular block 33 plays a guiding role. When the rectangular block 33 is inserted into the rectangular groove 32, the positioning plate 36 is inserted into the insertion groove 34, so that one end of the positioning plate 36 is inserted into the positioning groove 35 to limit the position of the rectangular block 33. Then the bolt is screwed into the threaded hole 37 and passed through the through hole 38 to fix the position of the positioning plate 36 to achieve the positioning of the positioning plate 36. The rectangular block 33 and the rectangular groove 32 are installed together through the positioning plate 36 and the mounting plate 3 can be installed on the plunger 1, which is convenient for the later replacement and maintenance of the mounting plate 3.

[0042] like Figure 7 As shown, in some embodiments, the positioning plate 36 and the insertion groove 34 are both in the shape of a right triangle, that is, the positioning groove 35 is also in the shape of a right triangle, and one side of the positioning plate 36 is constructed as an arc surface, and the arc surface smoothly transitions to the outer peripheral side of the plunger 1, as shown in FIG. Figure 7As shown, the positioning plate 36 is in the shape of a right triangle, so that after the positioning plate 36 is inserted into the insertion groove 34, it can enter the positioning groove 35 more smoothly, thereby improving the guiding effect.

[0043] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sealing assembly for a plunger pump, comprising a plunger pump, wherein the plunger pump has a plunger (1) and a cylinder (2), wherein the plunger (1) is movably inserted in the cylinder (2), and wherein: Also includes: A mounting plate (3), the mounting plate (3) being mounted on one end of the plunger (1) located inside the cylinder body (2), a plurality of sliding arc plates (4) being slidably mounted in a circular array on the mounting plate (3), the sliding arc plates (4) sliding in a direction toward the axis of the mounting plate (3), an arc-shaped mounting groove (5) being provided on the outer peripheral side of the sliding arc plate (4), and a sealing rubber ring (7) being clamped on the plurality of sliding arc plates (4) through the plurality of arc-shaped mounting grooves (5); A spreading mechanism (6), the spreading mechanism (6) is mounted on the mounting plate (3) and acts on the plurality of sliding arc plates (4). When hydraulic oil enters the cylinder body (2), the spreading mechanism (6) provides a pressing force in a direction away from the axis of the mounting plate (3) to the plurality of sliding arc plates (4), so that the outer peripheral side of the sealing rubber ring (7) contacts the inner peripheral wall of the cylinder body (2); The spreading mechanism (6) comprises a mounting rod (601) coaxially constructed on the end face of the mounting plate (3); a sliding plate (602) is slidably sleeved on the mounting rod (601); a convex plate (603) is constructed on a side of the sliding plate (602) close to the sliding arc plate (4); a first connecting rod (604) is hinged between the convex plate (603) and the sliding arc plate (4); The sliding plate (602) is provided with an installation cavity (12), the sliding plate (602) is provided with a protrusion (13) located in the installation cavity (12), a driving plate (14) is slidably installed in the installation cavity (12), a wedge block (15) is provided at one end of the driving plate (14) close to the installation rod (601), a plurality of wedge grooves (16) for inserting the wedge blocks (15) are provided on one side of the installation rod (601) along its length direction, a resisting spring piece (17) is provided between the driving plate (14) and the protrusion (13), and a shielding sleeve (20) for shielding the wedge grooves (16) is provided at the inner edges of both ends of the sliding plate (602).

2. A sealing assembly for a plunger pump according to claim 1, characterized in that: The two end faces of the sliding arc plate (4) are provided with shift grooves (8), and arc push plates (9) are movably arranged between the adjacent shift grooves (8). The arc push plates (9) are slidably installed on the mounting plate (3), and the sliding direction is toward the axial direction of the mounting plate (3). A second connecting rod (10) is hinged between the arc push plate (9) and the sliding plate (602), and a card slot (11) is provided on the outer peripheral side of the arc push plate (9), which is used to clamp the sealing rubber ring (7).

3. The sealing assembly of a plunger pump according to claim 1, characterized in that: A blocking plate (18) for blocking an opening on one side of the installation cavity (12) is mounted on the sliding plate (602); a connecting plate (19) slidably connected to the driving plate (14) is constructed on a side of the blocking plate (18) close to the installation cavity (12).

4. The sealing assembly of a plunger pump according to claim 1, characterized in that: A thread is provided on the outer peripheral side of the shielding sleeve (20) away from the sealing rubber ring (7), and a push plate (21) is provided on the movable sleeve of the mounting rod (601) and is engaged with the thread of the shielding sleeve (20). A tightening spring (22) is connected between the push plate (21) and the shielding sleeve (20), and an annular groove (23) is provided on the outer peripheral side of the push plate (21), and a sealing ring (39) is provided inside the annular groove (23).

5. The sealing assembly of a plunger pump according to claim 4, characterized in that: A plurality of sliding grooves (24) communicating with the annular groove (23) are provided in a circular array inside the push plate (21), and the axis direction of the sliding groove (24) faces the axis of the push plate (21). An oil inlet groove (25) communicating with the sliding groove (24) is provided on the push plate (21). A movable plate (26) is slidably installed in the sliding groove (24). One end of the movable plate (26) is located in the annular groove (23) and is constructed with an arc plate (27). The outer peripheral side of the arc plate (27) contacts the inner peripheral side of the sealing ring (39).

6. The sealing assembly of a plunger pump according to claim 5, characterized in that: A sleeve (28) for shielding the oil inlet groove (25) is installed on the push plate (21), an oil inlet hole (29) is opened at one end of the sleeve (28), a shielding plate (30) for shielding the oil inlet hole (29) is slidably installed inside the sleeve (28), a gap is left between the outer peripheral side of the shielding plate (30) and the inner peripheral side of the sleeve (28), and a resistance spring (31) is installed between the shielding plate (30) and the sleeve (28).

7. The sealing assembly of a plunger pump according to claim 1, characterized in that: A rectangular groove (32) is provided at the end of the plunger (1); a rectangular block (33) is constructed on the mounting plate (3) and is tightly inserted into the rectangular groove (32); a plug-in groove (34) communicating with the rectangular groove (32) is symmetrically provided on the plunger (1); a positioning groove (35) is provided on the rectangular block (33); a positioning plate (36) for being inserted into the positioning groove (35) is slidably inserted in the plug-in groove (34); a threaded hole (37) is symmetrically provided on the plunger (1); a through hole (38) coaxial with the threaded hole (37) is provided on the positioning plate (36); a bolt is screwed into the threaded hole (37) and passes through the through hole (38).

8. The sealing assembly of a plunger pump according to claim 7, characterized in that: The positioning plate (36) and the insertion slot (34) are both in the shape of a right triangle. One side of the positioning plate (36) is constructed as an arcuate surface, and the arcuate surface smoothly transitions to the outer peripheral side of the plunger (1).

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