CN221169867U - Composite eccentric wheel mechanism for reciprocating pump - Google Patents
Composite eccentric wheel mechanism for reciprocating pump Download PDFInfo
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- CN221169867U CN221169867U CN202322862603.XU CN202322862603U CN221169867U CN 221169867 U CN221169867 U CN 221169867U CN 202322862603 U CN202322862603 U CN 202322862603U CN 221169867 U CN221169867 U CN 221169867U
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Abstract
The utility model discloses a composite eccentric wheel mechanism for a reciprocating pump, which aims to solve the defects of complex N-axis appearance and complex processing technology in the way of adjusting the eccentricity by N-axis parts in the prior art; and stress concentration at the inflection point of the N axis is easy to cause the problem of broken axis when in use. The utility model solves the technical problems by the following technical proposal: comprising the following steps: one end of the connecting rod is provided with a rotary hole; the large eccentric sleeve is arranged in the rotary hole, and the outer side wall of the large eccentric sleeve is matched with the rotary hole; a large eccentric hole is arranged in the large eccentric sleeve; the rotating cam is matched with the large eccentric hole; a small eccentric shaft is eccentrically arranged at the end part of the rotary cam; the rotating structure is used for rotating the small eccentric shaft. Because the large eccentric sleeve and the small eccentric sleeve are both revolution bodies, the revolution bodies can be processed in conventional modes such as turning and milling, and the like, and meanwhile, the characteristics of a large amount of materials are not removed on the parts, so that the strength requirement can be ensured, and the service life of the revolution bodies is prolonged.
Description
Technical Field
The utility model relates to the technical field of reciprocating pumps, in particular to a composite eccentric wheel mechanism for a reciprocating pump.
Background
The metering pump is used as a fluid conveying device capable of accurately regulating flow, and is widely applied to the fields of petrochemical industry, environmental protection, electric power, food, medicine and the like. The key core component in the metering pump is an adjustable eccentric mechanism, and the function of the mechanism is as follows: firstly, the device is used for driving the plunger to perform periodic reciprocating movement; and the variable eccentricity (or called as crank length) can be generated by the adjusting mechanism to change the piston stroke, so that the volume change is controlled, and the purpose of controlling the flow is achieved. The current way of adjusting the eccentricity in the eccentric wheel mechanism in the metering pump is mainly an N-axis mechanism, as shown in fig. 1, through the axial movement of the N axis, the eccentric sliding sleeve can move along the inclined axis diameter of the eccentric sliding sleeve, so that different radial eccentric distances are generated to control the piston stroke.
In actual use, the stability, reliability and flow regulation precision of the metering pump work are greatly related to the precision of the processing of the N-axis parts, and are generally influenced by the inclination geometric angle and the self strength of the inclined shaft section on the N axis. From the technical perspective, the N-axis is complex in appearance, multiple working procedures are needed to be combined and processed by different machine tools, multiple clamping is needed, and the requirement on positioning precision is high; secondly, according to the N-axis structure, most materials are required to be removed in processing, the strength of the part is greatly weakened, and meanwhile, the stress concentration at the abrupt inflection point of the section of the part is large, so that the shaft breakage condition occurs frequently in use.
Disclosure of utility model
The utility model overcomes the defects of complex processing technology due to complex appearance of the N shaft in the way of adjusting the eccentricity by the N shaft part in the prior art; the stress at the inflection point of the N shaft is concentrated and the problem of broken shaft is easy to occur when the composite eccentric wheel mechanism is used, and the composite eccentric wheel mechanism for the reciprocating pump is provided, the function of adjustable eccentricity can be realized through the matching of the large eccentric sleeve and the small eccentric sleeve, and as the large eccentric sleeve and the small eccentric sleeve are both gyrorotor bodies, the composite eccentric wheel mechanism can be processed in a conventional method (such as turning, milling and the like) and has the characteristics that a large amount of materials are not removed on parts, so that the strength requirement can be ensured and the service life is prolonged; in addition, compared with an N-axis structure, the composite eccentric wheel mechanism has small axial size and is beneficial to the miniaturization design of the whole machine.
In order to solve the technical problems, the utility model adopts the following technical scheme: a compound eccentric wheel mechanism for a reciprocating pump, comprising:
a rotary hole is formed in one end of the connecting rod;
The large eccentric sleeve is arranged in the rotary hole, and the outer side wall of the large eccentric sleeve is matched with the rotary hole; a large eccentric hole is arranged in the large eccentric sleeve;
The rotating cam is matched with the large eccentric hole; a small eccentric shaft is eccentrically arranged at the end part of the rotary cam;
And the rotating structure is used for rotating the small eccentric shaft.
The large eccentric sleeve and the rotating cam are matched to form the eccentric wheel assembly with a certain amount, and the assembly can rotate around the axis of the small eccentric shaft after being installed, so that the connecting rod is driven to swing within a certain angle range, the piston is driven to do periodic reciprocating movement, the periodic change of the sealing volume is caused by the reciprocating movement of the piston, and the purpose of conveying fluid can be achieved by matching with the inlet and outlet one-way valve. Because the large eccentric sleeve, the rotating cam and the small eccentric shaft are all in a revolving body structure, the large eccentric sleeve, the rotating cam and the small eccentric shaft can be obtained by adopting a conventional processing method (such as turning, milling and the like), and meanwhile, the part has no characteristic of removing a large amount of materials, so that the strength requirement can be ensured, and the service life is long; and compared with an N-axis structure, the composite eccentric wheel mechanism has small axial size and is beneficial to the miniaturization design of the whole machine.
Preferably, the rotating structure comprises a sliding pin arranged on the inner side wall of the large eccentric hole and a spiral groove arranged on the outer side wall of the rotating cam, the spiral groove is spirally arranged along the axial direction of the rotating cam, and the end part of the sliding pin is matched with the spiral groove; the end part of the small eccentric shaft is provided with a pushing structure which pushes the small eccentric shaft to move along the axial direction.
The end part of the small eccentric shaft is provided with a pushing structure which pushes the small eccentric shaft to move along the axial direction. The pushing structure pushes the small eccentric shaft to move along the axial direction, and the sliding pin and the spiral groove are matched, so that the axial movement of the small eccentric shaft is converted into circumferential movement, and the small eccentric shaft can rotate for a certain angle; when in actual use, the two ends of the large eccentric sleeve in the axial direction are provided with limit supports, the large eccentric sleeve is limited in the axial direction and can only rotate, so that the sliding pin moves along the spiral when moving along with the small eccentric shaft in the axial direction, thereby driving the large eccentric sleeve to rotate and generating circumferential displacement.
Preferably, the pushing mechanism comprises an adjusting screw, a threaded hole matched with the adjusting screw, and the end part of the adjusting screw is rotatably connected with the end part of the small eccentric shaft.
Through rotating adjusting screw for adjusting screw and screw hole cooperation realize the displacement of axial direction, thereby promote little eccentric shaft along axial reverse movement.
Preferably, the end part of the small eccentric shaft is provided with a mounting hole, the end part of the adjusting screw is arranged in the mounting hole, and a bearing is arranged between the adjusting screw and the mounting hole.
The bearing can reduce friction between the adjusting screw and the mounting hole.
Preferably, a locking mechanism is provided on the side wall of the adjusting screw, and is used for locking the adjusting screw.
The locking mechanism is used for locking the adjusting screw rod and preventing the adjusting screw rod from axially moving.
Preferably, the locking mechanism includes a locking screw disposed on a side wall of the adjusting screw.
By turning the locking screw, the locking of the adjusting screw can be achieved. After the eccentricity of the large eccentric sleeve and the small eccentric shaft is adjusted, the large eccentric sleeve and the small eccentric shaft can keep an adjusted state, and relative deflection is prevented in the working process.
Preferably, the end of the slide pin is provided with a round head, and the round head is abutted against the spiral groove.
The round head is abutted with the spiral groove, so that the spiral groove can slide on the round head more smoothly.
Compared with the prior art, the utility model has the beneficial effects that: the large eccentric sleeve, the rotating cam and the small eccentric shaft are all in a revolving body structure, and can be obtained by adopting a conventional processing method (such as turning, milling and the like), and meanwhile, the part has no characteristic of removing a large amount of materials, so that the strength requirement can be ensured, and the service life is long; and compared with an N-axis structure, the composite eccentric wheel mechanism has small axial size and is beneficial to the miniaturization design of the whole machine.
Drawings
FIG. 1 is a schematic diagram in the background of the utility model;
FIG. 2 is a schematic driving diagram of the present utility model;
FIG. 3 is a schematic view of the construction of the large eccentric sleeve and the small eccentric shaft of the present utility model;
FIG. 4 is a schematic view of the operation of the present utility model;
FIG. 5 is a schematic illustration of the different eccentricities of the present utility model;
In the figure: 1. small eccentric shaft, 11, rotating cam, 12, spiral groove, 13, mounting hole, 2, big eccentric sleeve, 21, big eccentric hole, 22, side wall hole, 3, sliding pin, 4, connecting rod, 41, gyration hole, 5, piston, 51, screw hole, 6, adjusting screw, 7, locking screw, 8, bearing.
Detailed Description
The technical scheme of the utility model is further specifically described by the following specific embodiments with reference to the accompanying drawings:
Example 1: referring to fig. 1 to 5, a complex eccentric wheel mechanism for a reciprocating pump mainly includes a connecting rod 4, a large eccentric sleeve 2, a rotating cam 11, a small eccentric shaft 1, and a rotating structure for rotating the small eccentric shaft 1.
One end of the connecting rod 4 is provided with a rotary hole 41, and the other end of the connecting rod 4 is rotationally connected with the piston 5;
The large eccentric sleeve 2 is rotatably arranged in the rotary hole 41, and the outer side wall of the large eccentric sleeve 2 is matched with the rotary hole 41; a large eccentric hole 21 is formed in the large eccentric sleeve 2, and the large eccentric hole 21 is eccentrically arranged in the large eccentric sleeve 2;
The outer side wall of the rotary cam 11 is matched with the large eccentric hole 21; the two end parts of the rotating cam 11 are eccentrically provided with small eccentric shafts 1; the small eccentric shaft 1 and the rotating cam 11 are integrally formed.
The large eccentric sleeve 2 and the rotating cam 11 are matched to form an eccentric wheel assembly with a certain amount, and the assembly can rotate circumferentially around the axis of the small eccentric shaft 1 after being installed, so that the connecting rod 4 is driven to swing within a certain angle range, the piston 5 is driven to do periodic reciprocating movement, the piston 5 is caused to periodically change the sealing volume, and the purpose of conveying fluid can be achieved by matching with the inlet and outlet one-way valve.
Therefore, in order to conveniently adjust the eccentricity, a rotating structure is provided for rotating the small eccentric shaft 1, and the adjustment of the eccentricity is achieved by rotating the small eccentric shaft 1.
The specific structure of the rotating structure is as follows: the rotating structure comprises a sliding pin 3 arranged on the inner side wall of the large eccentric hole 21 and a spiral groove 12 arranged on the outer side wall of the rotating cam 11; the inner side wall of the large eccentric hole 21 is provided with a side wall hole 22, one part of the sliding pin 3 is clamped in the side wall hole 22, and the other part of the sliding pin 3 is clamped in the spiral groove 12; the spiral groove 12 is spirally arranged along the axial direction of the rotating cam 11, and the end part of the sliding pin 3 is matched with the spiral groove 12; in order to enable the sliding pin 3 to closely fit the spiral groove 12, a thrust spring may be further provided in the sidewall hole 22, the thrust spring pushing the end of the sliding pin 3 to abut against the spiral groove 12. And the end of the sliding pin 3 can be provided with a round head, and the round head is abutted with the spiral groove 12, so that the spiral groove 12 can slide on the round head more smoothly.
The end part of the small eccentric shaft 1 is provided with a pushing structure which pushes the small eccentric shaft 1 to move along the axial direction. The pushing structure pushes the small eccentric shaft 1 to move along the axial direction, and the sliding pin 3 and the spiral groove 12 are matched to convert the axial movement of the small eccentric shaft 1 into circumferential movement, so that the small eccentric shaft 1 can rotate for a certain angle; in actual use, the limiting supports are arranged at the two ends of the large eccentric sleeve 2 in the axial direction, the large eccentric sleeve 2 is limited in the axial direction and can only rotate, so that the sliding pin 3 moves along the spiral when moving along with the small eccentric shaft 1 in the axial direction, and the large eccentric sleeve 2 is driven to rotate to generate circumferential displacement.
The pushing structure may be driven by an oil cylinder or an electric cylinder, and the pushing structure in this embodiment includes: the adjusting screw 6 is provided with a threaded hole 51 matched with the adjusting screw 6, and the end part of the adjusting screw 6 is rotationally connected with the end part of the small eccentric shaft 1. By rotating the adjusting screw 6, the adjusting screw 6 is matched with the threaded hole 51, so that displacement in the axial direction is realized, and the small eccentric shaft 1 is pushed to move reversely along the axial direction.
The end of the small eccentric shaft 1 is provided with a mounting hole 13, the end of the adjusting screw 6 is arranged in the mounting hole 13, a bearing 8 is arranged between the adjusting screw 6 and the mounting hole 13, and the bearing 8 in the embodiment adopts an angular contact bearing 8.
In addition, a locking mechanism is arranged on the side wall of the adjusting screw 6, and is used for locking the adjusting screw 6 and preventing the adjusting screw 6 from moving axially; the locking mechanism comprises a locking screw 7 arranged on the side wall of the adjusting screw 6. By turning the locking screw 7, locking of the adjusting screw 6 can be achieved. After the eccentricity of the large eccentric sleeve 2 and the small eccentric shaft 1 is adjusted, the large eccentric sleeve and the small eccentric shaft can keep an adjusted state, and relative deflection is prevented in the working process.
As shown in fig. 5, the large eccentric sleeve 2 has an eccentricity E2, the small eccentric shaft 1 has an eccentricity E1, and the final eccentricity after adjustment by the adjusting screw 6 is the integrated eccentricity E. Assuming that the small eccentric shaft 1 generates a rotation angle alpha relative to the large eccentric sleeve 2 under the action of the adjusting screw 6, the comprehensive eccentricity E can be obtained by utilizing a cosine law in the triangles O1, O2 and O3 by means of a geometric relationship, and the comprehensive eccentricity E can be obtained, wherein the maximum stroke of the piston 5 is twice, namely S=2E; as shown in fig. 5, the 4 eccentric states of the eccentric assembly, wherein a is the combined eccentricity e=0, and the piston 5 (member 5) does not move due to no offset although the eccentric assembly rotates, and the flow rate is 0; the diagram B shows that the combined eccentricity E is not equal to 0 along with the increase of the relative rotation angle alpha of the small eccentric shaft 1 and the large eccentric sleeve 2, and the piston 5 starts to move so as to generate flow; the graph C shows a state that the comprehensive eccentricity E gradually increases; and D, the relative rotation angle of the two eccentric parts is 180 degrees, the comprehensive eccentricity E reaches the maximum, namely E=e1+e2, the plunger also operates with the maximum stroke, and the delivery flow rate reaches the maximum.
The large eccentric sleeve 2, the rotary cam 11 and the small eccentric shaft 1 are all in a revolving body structure, and can be obtained by adopting a conventional processing method (such as turning, milling and the like), and meanwhile, the parts have no characteristic of removing a large amount of materials, so that the strength requirement can be ensured, and the service life is long; and compared with an N-axis structure, the composite eccentric wheel mechanism has small axial size and is beneficial to the miniaturization design of the whole machine.
The above-described embodiments are merely preferred embodiments of the present utility model, and the present utility model is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (7)
1. A compound eccentric wheel mechanism for a reciprocating pump, comprising:
a rotary hole is formed in one end of the connecting rod;
The large eccentric sleeve is arranged in the rotary hole, and the outer side wall of the large eccentric sleeve is matched with the rotary hole; a large eccentric hole is arranged in the large eccentric sleeve;
The rotating cam is matched with the large eccentric hole; a small eccentric shaft is eccentrically arranged at the end part of the rotary cam;
And the rotating structure is used for rotating the small eccentric shaft.
2. The composite eccentric wheel mechanism for a reciprocating pump of claim 1, wherein the rotating structure comprises a sliding pin arranged on the inner side wall of the large eccentric hole and a spiral groove arranged on the outer side wall of the rotating cam, the spiral groove is spirally arranged along the axial direction of the rotating cam, and the end part of the sliding pin is matched with the spiral groove; the end part of the small eccentric shaft is provided with a pushing structure which pushes the small eccentric shaft to move along the axial direction.
3. The compound eccentric wheel mechanism for a reciprocating pump as claimed in claim 2, wherein the pushing mechanism comprises an adjusting screw, a threaded hole matched with the adjusting screw, and an end of the adjusting screw is rotatably connected with an end of the small eccentric shaft.
4. A compound eccentric wheel mechanism for a reciprocating pump as in claim 3 wherein the end of the small eccentric shaft is provided with a mounting hole, the end of the adjusting screw is provided in the mounting hole, and a bearing is provided between the adjusting screw and the mounting hole.
5. The compound eccentric wheel mechanism for a reciprocating pump as claimed in claim 3 or 4, wherein a locking mechanism is provided on a side wall of the adjusting screw, and the locking mechanism is used for locking the adjusting screw.
6. The compound eccentric mechanism for a reciprocating pump as recited in claim 5, wherein the locking mechanism comprises a locking screw disposed on a side wall of the adjusting screw.
7. The composite eccentric wheel mechanism for a reciprocating pump of claim 2, wherein the end of the sliding pin is provided with a round head, and the round head is abutted with the spiral groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322862603.XU CN221169867U (en) | 2023-10-23 | 2023-10-23 | Composite eccentric wheel mechanism for reciprocating pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322862603.XU CN221169867U (en) | 2023-10-23 | 2023-10-23 | Composite eccentric wheel mechanism for reciprocating pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221169867U true CN221169867U (en) | 2024-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322862603.XU Active CN221169867U (en) | 2023-10-23 | 2023-10-23 | Composite eccentric wheel mechanism for reciprocating pump |
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| Country | Link |
|---|---|
| CN (1) | CN221169867U (en) |
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2023
- 2023-10-23 CN CN202322862603.XU patent/CN221169867U/en active Active
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