High-flow plunger pump with rotatable plunger

Abstract

The utility model relates to the technical field of plunger pumps, in particular to a high-flow plunger pump with a rotatable plunger. Comprising a power end, a fluid end and a connecting assembly, a middle rod of the power end pushes a plunger to do reciprocating rectilinear motion through the connecting assembly, pressurization of a medium in the fluid end is achieved, the connecting assembly comprises a clamping sleeve, a clamping ring, a transmission ball and a ball seat, the clamping ring is fixed to a clamping groove of the plunger, and the plunger and the clamping ring are sleeved with the clamping sleeve. The clamping sleeve is fixedly connected with the middle rod, a hole for fixing the transmission pin is formed in the clamping sleeve, a sliding groove is formed in the outer surface of the plunger, the lower end of the transmission pin is located in the sliding groove, a hemispherical groove is formed in the end of the plunger, a hemispherical groove corresponding to the hemispherical groove is formed in the ball seat, and the ball seat is arranged in a groove formed in the end of the middle rod. And a spring is arranged at the bottom of the ball seat. By applying the eccentric wear-resistant plunger, the eccentric wear phenomenon of the plunger can be effectively avoided, and the positive effects of prolonging the service life of the plunger and reducing the maintenance cost are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pumps, in particular to a large-flow plunger pump with a rotatable plunger. Background Art

[0002] As a common reciprocating positive displacement pump in the industrial field, the plunger pump is widely used in various fields such as water injection, hydraulic pressure, and boosting and delivery. The plunger pump is mainly divided into the power end and the hydraulic end. The power end converts the rotary motion into reciprocating linear motion through the crank-connecting rod mechanism, thereby driving the plunger to reciprocate in the hydraulic end, realizing the volume change inside the hydraulic end, thereby realizing the boosting function.

[0003] For large-flow plunger pumps, the plunger diameter is large, the sealing contact area is large, and the reciprocating plunger is one of the main vulnerable parts of the plunger pump. Especially when the medium contains hard particles or is not installed properly, the wear of the plunger will increase, affecting the service life of the plunger. When hard particles get stuck between the packing and the plunger or when eccentric wear occurs due to improper installation, the same part of the plunger will be repeatedly scratched, causing the scratches on the surface of the plunger to deepen, which will cause the medium to leak and eventually fail and need to be replaced. Especially for large-flow plunger pumps, the plunger diameter is large. As long as any part of it is severely worn and the scratches are too deep, it will cause the seal to fail, resulting in the need to replace the entire plunger, greatly increasing the maintenance cost. Summary of the invention

[0004] The utility model aims to provide a large flow plunger pump with a rotatable plunger, so as to effectively avoid eccentric wear of the plunger, increase the service life of the plunger and reduce maintenance costs.

[0005] The utility model provides a large flow plunger pump with a rotatable plunger, comprising a power end, a hydraulic end and a connecting assembly, wherein the intermediate rod of the power end pushes the plunger to perform reciprocating linear motion through the connecting assembly to realize pressurization of the medium inside the hydraulic end, and is characterized in that the connecting assembly comprises a ferrule, a ferrule, a transmission ball and a ball seat, wherein the ferrule is fixed on the ferrule groove, the ferrule is sleeved on the outside of the plunger and the ferrule ring, and slides relatively on the plunger shaft along the axial direction of the plunger, and the ferrule is connected and fixed with the intermediate rod; a hole for fixing a transmission pin is provided on the ferrule, a slide groove is provided on the outer surface of the plunger, the lower end of the transmission pin is in the slide groove and is connected with the slide groove in cooperation; a hemispherical groove is provided at the end of the plunger, a hemispherical groove corresponding thereto is provided on the ball seat, and the two hemispherical grooves constitute a spherical space for placing the transmission ball; the ball seat is arranged in the groove provided at the end of the intermediate rod, and slides axially in the groove; a spring is arranged at the bottom of the ball seat, one end of the spring is fixed on the groove in the intermediate rod, and the other end is connected to the ball seat.

[0006] Furthermore, the slide groove adopts a periodic structure and is arranged in a zigzag ring shape on the outer surface of the plunger along the circumferential direction of the plunger. The lower end of the transmission pin penetrates into the slide groove and moves relatively in the slide groove.

[0007] Furthermore, the contact surface of the slide groove side wall from the initial contact point to the final contact point between the transmission pin and the slide groove side wall on one side is the same serrated surface, and the circumferential projection range of the contact surface of the slide groove side wall completely covers the circumferential projection range of the non-contact surface of the slide groove side wall where the transmission pin on the opposite side does not contact the slide groove side wall.

[0008] Furthermore, the angle between the contact surface of the slide groove side wall where the transmission pin contacts the slide groove side wall and the plunger axis is less than 45°.

[0009] Furthermore, the clamping ring is configured as a multi-petal combined structure.

[0010] Furthermore, the ferrule is connected and fixed to the middle rod via threads.

[0011] The utility model provides a large-flow plunger pump with a rotatable plunger. The serrated grooves arranged in a ring on the plunger and the transmission pins matched therewith realize the synchronous rotation of the plunger during the reciprocating motion. This makes the wear of the plunger more uniform, effectively avoids the phenomenon of eccentric wear of the plunger, and effectively improves the service life of the plunger without the need to introduce other external power. The utility model has more obvious advantages in use, especially for large-flow and high-pressure working conditions, because the plunger has a large diameter, and the effect of alleviating local eccentric wear through rotation will be better, and the service life of the plunger will be longer. In summary, the utility model has the advantages of compact structure, strong practicality, and a wide range of applications, and has the positive effects of reducing the maintenance cost of the plunger and greatly improving the service life of the plunger. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the connection assembly of the utility model;

[0014] Figure 3 It is a schematic diagram of the structure of the transmission pin and the slide slot of the utility model in different matching positions;

[0015] Figure 4 This is a schematic diagram of the structure of the connection assembly of the utility model in the A position state;

[0016] Figure 5 This is a schematic diagram of the structure of the connection assembly of the utility model in the B position state;

[0017] Figure 6This is a schematic diagram of the structure of the connection assembly of the utility model in the C position state;

[0018] Figure 7 This is a schematic diagram of the structure of the connection assembly of the utility model in the D position state;

[0019] Figure 8 It is a partial schematic diagram of the utility model in the first viewing angle state;

[0020] Fig. 9 It is a partial schematic diagram of the utility model in the second viewing angle state. DETAILED DESCRIPTION

[0021] like Figure 1-Figure 9 As shown, the utility model provides a large flow plunger pump with a rotatable plunger, comprising a power end 1, a hydraulic end 2 and a connecting assembly 3. The power end converts the external input rotational power into a reciprocating thrust through a crank connecting rod mechanism, and pushes the intermediate rod 12 of the power end to do reciprocating motion. The intermediate rod pushes the plunger 4 to do reciprocating linear motion through the connecting assembly, thereby pressurizing the medium inside the hydraulic end.

[0022] Specifically, the connecting assembly is mainly composed of a sleeve 5, a snap ring 6, a transmission ball 9 and a ball seat 10. The snap ring is fixed on the slot of the plunger. For easy disassembly, the snap ring can be divided into multiple petals. The sleeve is sleeved on the outside of the plunger and the snap ring and can slide relative to each other along the axial direction. The sleeve is connected and fixed to the intermediate rod by a thread. A hole is provided on the sleeve for fixing the transmission pin 7. The ball seat is used to fix the transmission ball and is arranged in a groove provided at the end of the intermediate rod and can slide axially in the groove. A slide groove 8 is provided on the outer surface of the plunger, and the lower end of the transmission pin is in the slide groove. A hemispherical groove is provided at the end of the plunger, and a hemispherical groove is also provided on the ball seat, which together with the hemispherical groove at the end of the plunger constitutes a spherical space in which the transmission ball can be placed. The transmission ball is used to transmit the huge thrust required for supercharging, and when the plunger is offset, the plunger and the intermediate rod are not strictly on the same axis. At this time, the plunger can rotate relative to the transmission ball, thereby achieving automatic centering. A spring 11 is arranged at the bottom of the ball seat, one end of which is fixed to a groove in the middle rod and the other end is connected to the ball seat, so as to push the ball seat to move axially so as to keep coordination with the movement of the plunger.

[0023] The chute adopts a periodic structure, such as Figure 3 The figure shows two cycles of the slide groove in the embodiment of the utility model. The drive pins are arranged in a sawtooth ring along the circumferential direction of the plunger on the outer surface of the plunger, and the lower end of the drive pin is deeply inserted into the slide groove and moves relatively in the slide groove.

[0024] Next, by combining Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 In the operation process shown, the power transmission and the automatic rotation principle of the plunger of the large flow plunger pump with a rotatable plunger provided by the utility model are introduced, and then the utility model is further described and illustrated.

[0025] When the plunger moves to the right to increase pressure, the transmission pin is in the slide groove. Figure 3 The left end face of the ball seat is in direct contact with the middle rod, and the internal state of the connecting component is as follows: Figure 4 As shown, at this time, the huge thrust required for supercharging is transmitted through the intermediate rod, ball seat, transmission ball, and plunger.

[0026] When the middle rod and plunger reach the right apex, the middle rod starts to move back to the left, and the middle rod, the ferrule and the transmission pin move to the left together. At this time, the plunger does not move, and the ball seat and the transmission ball remain stationary under the action of the spring. At this time, the transmission pin starts to move out of the slide slot. Figure 3 Move from position A to position B, that is, Figure 3 The B position state in the connection component is as follows: Figure 5 shown.

[0027] Then the middle rod drives the ferrule and the transmission pin to continue to move to the left. At this time, the transmission pin will squeeze the side wall of the slide groove, that is, the transmission pin moves along the slide groove wall from Figure 3 The drive pin can only move axially with the ferrule. When the angle between the side wall of the slideway in contact with the drive pin and the axis of the plunger is less than 45°, the axial force of the drive pin on the plunger through the side wall of the slideway is smaller than the circumferential force. Therefore, the plunger will be squeezed and rotated. The direction of rotation is Figure 3 When the driving pin moves relative to the slide slot, Figure 3 When the middle rod is in the C position, the end of the ferrule moves to the position of the retaining ring. When the middle rod continues to move to the left, the middle rod drives the ferrule, the ferrule drives the retaining ring, and the retaining ring drives the plunger to move to the left together. At this time, the transmission pin and the wall of the slide groove are not subjected to force, and the plunger stops rotating. The internal state of the connecting assembly is as follows: Figure 6 shown.

[0028] When the middle rod reaches the left vertex and moves to the right again, the middle rod drives the ferrule and the transmission pin to move to the right together. At this time, the plunger remains stationary, and the transmission pin moves out of the slide groove. Figure 3 When the C position in the figure starts to move to the D position, the transmission pin starts to squeeze the wall of the slide slot, and the internal state of the connecting component is as follows: Figure 7 shown.

[0029] When the middle rod continues to move to the right, the transmission pin moves along the wall of the slide groove from Figure 3The piston starts to move from position D to position E. At this time, if the plunger wants to move to the right, it will compress the hydraulic end medium, which requires a large axial thrust. Therefore, the plunger will rotate again under the pressure of the transmission pin, and the rotation direction is Figure 3 in the direction of the arrow shown until the drive pin moves Figure 3 When the transmission pin reaches the E position, the left end face of the ball seat is in direct contact with the middle rod, and the thrust is transmitted through the middle rod, ball seat, transmission ball, and plunger, so that the plunger moves right to pressurize the medium. The internal state of the connection assembly is as follows: Figure 4 As shown, at this time, the transmission pin and the slide slot are not subjected to force, and the plunger stops rotating. Figure 3 The difference between the E position and the A position is one cycle, and one cycle is completed at this time. That is, in one reciprocating cycle, the plunger rotates from the A position to the E position, realizing the automatic rotation function of the plunger.

[0030] It is worth noting that in order to ensure the rotation of the plunger of the utility model in one direction, the contact surface of the slide groove side wall where the transmission pin and the slide groove side wall on one side are located from the initial contact point to the final contact point is the same serrated surface, and the circumferential projection range of the slide groove side wall contact surface completely covers the circumferential projection range of the slide groove side wall non-contact surface where the transmission pin on the opposite side does not contact the slide groove side wall. For example, the transmission pin moves along the slide groove side wall from Figure 3 When the position B in the figure moves to the position C, the contact surface m of the slide groove side wall where the starting contact point q and the final contact point s of the transmission pin and the slide groove side wall are located is the same serrated surface of the slide groove, and the circumferential projection range of the contact surface of the slide groove side wall completely covers the circumferential projection range of the non-contact surface n of the slide groove side wall where the opposite transmission pin does not contact the slide groove side wall.

[0031] The utility model realizes synchronous rotation of the plunger during reciprocating motion by means of the sawtooth grooves arranged in a ring on the plunger and the transmission pins matched therewith, so that the wear of the plunger is more uniform, and the eccentric wear of the plunger is effectively avoided, thereby effectively improving the service life of the plunger, and no additional external power is required. The utility model has a more obvious use advantage, especially for working conditions with large flow and high pressure, because the plunger has a large diameter, and the effect of alleviating local eccentric wear by rotation will be better, and the service life of the plunger will be longer.

Claims

1. A large flow plunger pump with a rotatable plunger, comprising a power end, a hydraulic end and a connecting assembly, wherein the intermediate rod of the power end pushes the plunger to perform reciprocating linear motion through the connecting assembly to increase the pressure of the medium inside the hydraulic end, characterized in that: The connecting assembly includes a sleeve, a snap ring, a transmission ball and a ball seat. The snap ring is fixed on the slot of the plunger. The sleeve is sleeved on the outside of the plunger and the snap ring, and slides relatively on the plunger shaft along the axial direction of the plunger. The sleeve is connected and fixed to the intermediate rod. A hole for fixing the transmission pin is provided on the sleeve, and a slide groove is provided on the outer surface of the plunger. The lower end of the transmission pin is located in the slide groove and is connected with the slide groove. A hemispherical groove is provided at the end of the plunger, and a hemispherical groove corresponding to the groove is provided on the ball seat. The two hemispherical grooves constitute a spherical space for placing the transmission ball. The ball seat is arranged in the groove provided at the end of the intermediate rod, and slides axially in the groove. A spring is provided at the bottom of the ball seat, one end of the spring is fixed to the groove in the intermediate rod, and the other end is connected to the ball seat.

2. A large flow plunger pump with a rotatable plunger according to claim 1, characterized in that: The slide groove adopts a periodic structure and is arranged in a zigzag ring array on the outer surface of the plunger along the circumferential direction of the plunger. The lower end of the transmission pin penetrates into the slide groove and moves relatively in the slide groove.

3. A large flow plunger pump with a rotatable plunger according to claim 2, characterized in that: The contact surface of the slide groove side wall from the initial contact point to the final contact point between the transmission pin and the slide groove side wall on one side is the same serrated surface, and the circumferential projection range of the contact surface of the slide groove side wall completely covers the circumferential projection range of the non-contact surface of the slide groove side wall where the transmission pin on the opposite side does not contact the slide groove side wall.

4. A large flow plunger pump with a rotatable plunger according to claim 3, characterized in that: The angle between the contact surface of the slide groove side wall where the transmission pin contacts the slide groove side wall and the plunger axis is less than 45°.

5. A large flow plunger pump with a rotatable plunger according to claim 1, characterized in that: The clamping ring is arranged as a multi-petal combined structure.

6. A large flow plunger pump with a rotatable plunger according to claim 1, characterized in that: The ferrule is connected and fixed with the middle rod through threads.

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