Crankshaft for plunger pump

Abstract

The utility model discloses a crankshaft for a plunger pump, which belongs to the technical field of crankshafts and comprises a crankshaft main body, and the crankshaft main body comprises a first crankshaft neck, a first crankshaft arm, a second crankshaft neck, a second crankshaft arm and a third crankshaft neck which are sequentially connected. Arc-shaped grooves used for installing crankshaft bushes are machined in the outer walls of the first crankshaft journal, the second crankshaft journal and the third crankshaft journal, and an input end is fixedly arranged at the end, away from the first crankshaft arm, of the first crankshaft journal. The arc-shaped groove is processed on the N-shaped crankshaft main body, so that the lubricating effect is better and the service life is prolonged when the main journal and the crankshaft tile are matched with each other, primary inertia moment and centrifugal moment generated during operation of a fluid end can be balanced through the N-shaped design, the vibration of the crankshaft in the working process is greatly reduced, and the service life of the crankshaft is prolonged. Therefore, the running smoothness and comfort of the fluid end are improved, and part abrasion and noise caused by vibration are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of crankshaft belongs to a kind of crankshaft for plunger pump. BACKGROUND

[0002] The crankshaft for plunger pump realizes the liquid suction and discharge function of plunger pump by converting rotary motion into reciprocating linear motion.When the crankshaft rotates, the connecting rod swings under the drive of the crankshaft, thereby pushing the plunger to reciprocate in the cylinder. When the plunger is pulled outward, the pressure in the working chamber decreases, forming a negative pressure, the inlet valve opens, and the liquid is sucked in; when the plunger is pushed inward, the pressure in the working chamber increases, the outlet valve opens, and the liquid is discharged, thus realizing the circulation of liquid delivery. For example, the prior art with publication number CN215521593U discloses a high-strength crankshaft for a three-cylinder high-pressure plunger pump, which is connected by a thrust main journal, three connecting rod journals and two crank arms, so that the axial size of the crankcase housing can be reduced, the overall power end size is smaller, and the structure is more compact, which brings great convenience to the installation and transportation of the crankcase.

[0003] However, the conventional crankshaft for plunger pump has the following problems in use: since the surface of the crankshaft is smooth, the crankshaft bush cannot be limited when connected with the crankshaft, and may be damaged due to excessive movement. In addition, the inertial torque and centrifugal torque generated by the operation of the crankshaft cannot be effectively balanced, which may cause vibration of the crankshaft, affecting not only the service life of the crankshaft itself but also the normal use of the remaining parts inside the plunger pump. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a crankshaft for plunger pump to solve the problem that the crankshaft bush is damaged due to excessive movement caused by the smooth surface of the crankshaft, and the inertial torque and centrifugal torque generated by the operation of the crankshaft cannot be effectively balanced, causing vibration of the crankshaft and parts inside the plunger pump.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A crankshaft for plunger pump, comprising a crankshaft main body, the crankshaft main body comprises a first crank journal, a first crank arm, a second crank journal, a second crank arm and a third crank journal connected in sequence, arc-shaped grooves for installing crank bushings are machined on the outer walls of the first crank journal, the second crank journal and the third crank journal, an input end is fixedly arranged at one end of the first crank journal away from the first crank arm, an output end is fixedly arranged at one end of the third crank journal away from the second crank arm, and the first crank journal, the first crank arm, the second crank journal, the second crank arm and the third crank journal form an N-shaped structure.

[0007] Further, the input end and the output end are both fixedly sleeved with sealing rings, and the two sealing rings are arranged between the first crank journal and the input end and between the third crank journal and the output end respectively, so that the sealing performance between the input end and the output end and the plunger pump shell is improved.

[0008] Further, a rectangular groove is formed at one end of the input end away from the first crank journal, and the rectangular groove is arranged outside the sealing ring, so that the stability of the connection between the input end and the driving device is improved.

[0009] Further, a fixing hole is formed at the center of the side away from the input end and the output end, and the fixing hole is arranged below the rectangular groove.

[0010] Further, the first crank journal, the first crank arm, the second crank journal, the second crank arm and the third crank journal are integrally formed.

[0011] Further, the outer wall of the first crank journal, the outer wall of the second crank journal and the outer wall of the third crank journal are both fixedly provided with two protrusions, and the two protrusions are arranged on both sides of the arc-shaped groove, so that the crank bearing can be limited, and the normal use of the plunger pump is avoided from being affected by excessive deviation of the crank bearing.

[0012] Further, the outer wall of the first crank arm and the outer wall of the second crank arm are both provided with balance blocks, and the balance blocks are detachably fixed to the first crank arm and the second crank arm through fastening bolts.

[0013] Further, an installation hole is formed on the surface of each balance block, the fastening bolt is arranged in the installation hole, and an insertion hole is formed on each balance block and each fastening bolt, and a fastening bolt is inserted into the two insertion holes, so that the loosening is prevented.

[0014] The utility model has the advantages of the following:

[0015] 1. The utility model discloses a crankshaft body formed in an N shape by a first crank journal, a first crank arm, a second crank journal, a second crank arm and a third crank journal, and an arc-shaped groove is formed on the N-shaped crankshaft body, so that the lubrication effect is better when the main journal and the crank bearing cooperate with each other, the service life is prolonged, the primary inertia moment and the centrifugal moment generated when the hydraulic end operates are balanced through the design of the N shape, the vibration in the working process is greatly reduced, the running smoothness and the comfort of the hydraulic end are improved, and the abrasion and the noise of parts caused by the vibration are reduced.

[0016] 2. The N-shaped crankshaft body can reduce vibration, and due to the reduction of vibration, the impact force on the crankshaft body and the parts in the plunger pump can be prolonged, the maintenance cost and failure rate of the hydraulic end are reduced, and the stress on each plunger can be more uniform in design, avoiding local overheating, accelerated wear and other problems caused by uneven stress, improving the overall reliability and durability, and being especially suitable for large displacement and high power hydraulic ends;

[0017] 3. The N-shaped crankshaft can better withstand high-load working conditions, ensure its stability and safety under long-time high-load operation, and compared with other types of crankshafts, the N-shaped crankshaft body structure is relatively compact, occupies less space in the plunger pump, can provide more space for the arrangement of other components, is conducive to overall design and layout optimization, and at the same time, the compact structure also means that some unnecessary materials can be reduced, thereby reducing the weight of the crankshaft body to some extent, which helps to reduce the overall weight of the equipment and reduce the cost.

[0018] 4. The protrusions arranged on the crankshaft body play a limiting role on both sides of the crankshaft bushing, so that the crankshaft bushing is prevented from moving excessively and affecting the normal use of the crankshaft body, and the balance blocks arranged on the first crankshaft arm and the second crankshaft arm can offset the centrifugal force generated by the rotation of the crankshaft body, so that the periodic vibration of the crankshaft body during rotation can be further reduced through dynamic balance. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other implementation drawings can be obtained without creative labor on the basis of the provided drawings.

[0020] The structures, proportions, sizes, etc. shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0021] Figure 1 The overall structure schematic diagram provided by the present application is shown in the figure;

[0022] Figure 2 The overall structure front view provided by the present application is shown in the figure;

[0023] Figure 3 The overall structure right side view provided by the utility model;

[0024] Figure 4 The overall structure left side view provided by the utility model;

[0025] Figure 5 The balance block sectional view provided by the utility model.

[0026] In the figure: 1, crankshaft main body; 101, first crank journal; 102, first crank arm; 103, second crank journal; 104, second crank arm; 105, third crank journal; 106, arc-shaped groove; 107, input end; 108, output end;

[0027] 2, sealing ring; 3, rectangular groove; 4, fixing hole; 5, protrusion; 6, balance block; 7, fastening bolt; 8, mounting hole; 9, insertion hole; 10, fastening bolt. DETAILED DESCRIPTION

[0028] The embodiments of the utility model will be described below by specific examples, and those skilled in the art can easily understand other advantages and effects of the utility model from the disclosed content of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0029] Referring to the drawings accompanying Figures 1-5 The utility model provides a kind of crankshaft for plunger pump, including crankshaft main body 1, crankshaft main body 1 includes sequentially connected first crank journal 101, first crank arm 102, second crank journal 103, second crank arm 104 and third crank journal 105, and first crank journal 101, first crank arm 102, second crank journal 103, second crank arm 104 and third crank journal 105 are integrally formed.

[0030] Then, arc-shaped groove 106 for installing crank bush is machined on the outer wall of first crank journal 101, second crank journal 103 and third crank journal 105, input end 107 is fixedly arranged on the end of first crank journal 101 away from first crank arm 102, output end 108 is fixedly arranged on the end of third crank journal 105 away from second crank arm 104, and first crank journal 101, first crank arm 102, second crank journal 103, second crank arm 104 and third crank journal 105 form N shape.

[0031] In this embodiment, the outer wall of the input end 107 and the output end 108 is fixedly sleeved with a sealing ring 2, and the two sealing rings 2 are respectively arranged between the first crank journal 101 and the input end 107 and between the third crank journal 105 and the output end 108.

[0032] The crankshaft body 1 is composed of the first crank journal 101, the first crank arm 102, the second crank journal 103, the second crank arm 104 and the third crank journal 105, and is in the shape of N. On the one hand, the N-shaped crankshaft body 1 can well balance the primary inertia moment and the centrifugal moment generated during the operation of the hydraulic end, so that the vibration during the operation is greatly reduced, thereby improving the operation smoothness and comfort of the hydraulic end and reducing the wear and noise of parts caused by vibration. Due to the reduction of vibration, the impact force on each part inside the box is also reduced, which helps to prolong the service life of key parts such as connecting rods, pistons, piston rings, cylinder walls and bearings, and reduces the maintenance cost and failure rate of the hydraulic end. On the other hand, the N-shaped crankshaft body 1 can make the stress of each plunger more uniform in design, avoid local overheating and accelerated wear caused by uneven stress, and improve the overall reliability and durability. It is especially suitable for high-power hydraulic ends, and the N-shaped crankshaft body 1 can better withstand high-load working conditions to ensure its stability and safety under long-time high-load operation. Moreover, compared with other types of crankshafts, the N-shaped crankshaft body 1 has a relatively compact structure and occupies less space in the box, which provides more space for the arrangement of other parts and is conducive to overall design and layout optimization. The compact structure usually means that some unnecessary materials can be reduced, thereby reducing the weight of the crankshaft to some extent and reducing the overall weight of the equipment and the cost.

[0033] Moreover, the arc-shaped grooves 106 formed on the outer walls of the first crank journal 101, the second crank journal 103 and the third crank journal 105 make the lubrication effect better when the crankshaft body 1 and the crankshaft bushing cooperate, thereby prolonging the service life and improving the use stability of the crankshaft bushing.

[0034] Referring to the drawings Figures 1-5 The input end 107 is machined with a rectangular groove 3 away from one end of the first crank journal 101, the rectangular groove 3 is arranged outside the sealing ring 2, the input end 107 and the output end 108 are machined with a fixing hole 4 at the center of the side away from each other, and the fixing hole 4 is arranged below the rectangular groove 3.

[0035] In this embodiment, as Figures 1-4As shown, the outer wall of the first crank journal 101, the outer wall of the second crank journal 103 and the outer wall of the third crank journal 105 are fixedly provided with two protrusions 5, which are distributed on both sides of the arc-shaped groove 106. When the bearing shell is installed on the crankshaft main body 1, the two protrusions 5 can limit the bearing shell on both sides, so as to prevent the bearing shell from moving excessively and affecting the normal use of the crankshaft main body 1.

[0036] In this embodiment, as shown in the drawings, Figures 1-5 As shown, the outer wall of the first crank arm 102 and the outer wall of the second crank arm 104 are provided with a balance block 6, and the balance block 6 is detachably fixed with the first crank arm 102 and the second crank arm 104 by a fastening bolt 7. Moreover, the surface of each balance block 6 is processed with a mounting hole 8, the fastening bolt 7 is arranged in the mounting hole 8, and each balance block 6 and each fastening bolt 7 is processed with a insertion hole 9, and the two insertion holes 9 are inserted with a fastening pin 10.

[0037] By arranging the balance block 6 on the first crank arm 102 and the second crank arm 104, the centrifugal force generated by the rotation of the crankshaft main body 1 can be offset by the balance block 6, so as to further reduce the periodic vibration of the crankshaft main body 1 during rotation by dynamic balance.

[0038] Although the utility model has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model, all belong to the scope of protection required by the utility model.

Claims

1. A crankshaft for a plunger pump comprising a crankshaft body (1), characterized in that: The crankshaft body (1) comprises a first crank journal (101), a first crank arm (102), a second crank journal (103), a second crank arm (104) and a third crank journal (105) connected in sequence, and the outer walls of the first crank journal (101), the second crank journal (103) and the third crank journal (105) are all provided with arc-shaped grooves (106) for mounting crankshaft bushings; The first crank journal (101) is fixedly provided with an input end (107) at one end away from the first crank arm (102), and the third crank journal (105) is fixedly provided with an output end (108) at one end away from the second crank arm (104), and the first crank journal (101), the first crank arm (102), the second crank journal (103), the second crank arm (104) and the third crank journal (105) form an N-shaped structure.

2. The crankshaft for a piston pump of claim 1, wherein: The outer walls of the input end (107) and the output end (108) are both fixedly provided with sealing rings (2), and the two sealing rings (2) are respectively arranged between the first crank journal (101) and the input end (107) and between the third crank journal (105) and the output end (108).

3. The crankshaft for a piston pump of claim 2, wherein: The input end (107) is provided with a rectangular groove (3) at one end away from the first crank journal (101), and the rectangular groove (3) is arranged outside the sealing ring (2).

4. The crankshaft for a piston pump of claim 3, wherein: The input end (107) and the output end (108) are both provided with fixing holes (4) at the centers of the sides away from each other, and the fixing holes (4) are arranged below the rectangular groove (3).

5. The crankshaft for a piston pump of claim 1, wherein: The first crank journal (101), the first crank arm (102), the second crank journal (103), the second crank arm (104) and the third crank journal (105) are integrally formed.

6. The crankshaft for a piston pump of claim 1, wherein: The outer walls of the first crank journal (101), the second crank journal (103) and the third crank journal (105) are both fixedly provided with two protrusions (5), and the two protrusions (5) are arranged on both sides of the arc-shaped groove (106).

7. The crankshaft for a piston pump of claim 1, wherein: The outer walls of the first crank arm (102) and the second crank arm (104) are both provided with balance blocks (6), and the balance blocks (6) are detachably fixed to the first crank arm (102) and the second crank arm (104) by fastening bolts (7).

8. The crankshaft for a piston pump of claim 7, wherein: Each balance block (6) is provided with a mounting hole (8) on the surface, the fastening bolt (7) is arranged in the mounting hole (8), and each balance block (6) and each fastening bolt (7) are both provided with insertion holes (9), and the two insertion holes (9) are inserted with a fastening bolt (10).

Images