CN112128094A - Constant-diameter cam group for pulse-free constant-flow three-plunger pump - Google Patents
Constant-diameter cam group for pulse-free constant-flow three-plunger pump Download PDFInfo
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- CN112128094A CN112128094A CN202011003384.4A CN202011003384A CN112128094A CN 112128094 A CN112128094 A CN 112128094A CN 202011003384 A CN202011003384 A CN 202011003384A CN 112128094 A CN112128094 A CN 112128094A
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- 230000033001 locomotion Effects 0.000 claims abstract description 17
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000014509 gene expression Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000001133 acceleration Effects 0.000 description 15
- 230000007246 mechanism Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
- F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
- F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H53/00—Cams or cam-followers, e.g. rollers for gearing mechanisms
- F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
- F16H53/025—Single-track cams for single-revolution cycles; Camshafts with such cams characterised by their construction, e.g. assembling or manufacturing features
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H53/00—Cams or cam-followers, e.g. rollers for gearing mechanisms
- F16H53/06—Cam-followers
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention relates to the technical field of plunger pumps, in particular to a constant-diameter cam set for a pulse-free constant-flow three-plunger pump, which comprises three cams coaxially arranged, wherein the angle difference between any two cams is 120 degrees, and the lift range and the return stroke angle of the cams are equal; the cam is matched and sleeved with a cam follower, and the cam follower drives the plunger to reciprocate; the cam follower comprises a roller and a connecting rod, the two rollers which are oppositely arranged on the side of the constant-diameter cam are in contact connection with the constant-diameter cam, the wheel center connecting line of the two rollers passes through the hole center of the mounting hole, and the wheel center distance of the two rollers is kept constant in the process of contacting with the constant-diameter cam; the invention has the beneficial effects that: the cam follower corresponding to the three cams drives the plunger to move at a constant speed, so that the output flow of the pump is a constant value, and the cam follower is always in contact with the cams in the high-speed movement process, thereby improving the transmission precision of the constant-diameter cam set for the pulse-free constant-flow three-plunger pump.
Description
Technical Field
The invention relates to the technical field of plunger pumps, in particular to a constant-diameter cam set for a pulse-free constant-flow three-plunger pump.
Background
When the plunger type constant flow pump is used for conveying large-flow liquid, the problems of large pulse, large noise, incapability of realizing instantaneous constant flow and the like still exist, and the requirements of high pressure, high precision, large flow and constant liquid conveying in practical application cannot be met. The design of the cam set in the plunger pump is a key technology part, and the design of the cam profile is the key of the output precision and the flow rate. The cam structure is used for a flow pump of transmission equipment and is generally applied to the environments of liquid chromatography transmission feeding, micro-reaction transmission feeding, high-precision chemical proportioning transmission feeding and the like.
The existing plunger type constant flow pump cannot effectively ensure that a cam follower always moves forwards and returns along with a cam by 100 percent and keeps running at high speed for a long time; moreover, the main reason for the loud noise is that the plunger return mechanism used in the conventional plunger pump is a spring return mechanism, the plunger is kept in contact by a spring, and the service life of the spring also affects the precision of the pump output.
Disclosure of Invention
The invention aims to provide a constant-diameter cam set for a pulse-free constant-flow three-plunger pump, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a constant-flow three-plunger pump without pulse is provided with an equal-diameter cam set, which comprises three cams which are coaxially arranged, wherein the angle difference between any two cams is 120 degrees, and the lift range and the return stroke angle of the cams are equal; the cam is provided with a cam follower in a matching way, and the cam follower drives the plunger to reciprocate.
As a further scheme of the invention: the cam is an equal-diameter cam, the equal-diameter cam is provided with a mounting hole and a key groove, and the equal-diameter cam is mounted on the shaft through the mounting hole and the key groove.
As a still further scheme of the invention: the cam follower comprises a roller and a connecting rod, the two rollers which are oppositely arranged on the side of the constant-diameter cam are in contact connection with the constant-diameter cam, the wheel center connecting line of the two rollers passes through the hole center of the mounting hole, and the wheel center distance of the two rollers is kept constant in the process of contacting with the constant-diameter cam.
As a still further scheme of the invention: the two rollers are connected through a connecting rod, and when the equal-diameter cam drives one of the rollers to move, the other roller is driven by the connecting rod to move synchronously.
As a still further scheme of the invention: the speed of the plunger movement by the three cam followers is kept constant.
As a still further scheme of the invention: the rotation period of the cam is the same as the reciprocating period of the plunger, and the lift starting time of the cam is overlapped with the starting time of the reciprocating movement of the plunger.
As a still further scheme of the invention: the lift and return angle of each cam are both 180 degrees, and the lift is 40 mm.
As a still further scheme of the invention: the theoretical profile curve of the cam is configured by the cam rotation angle, and the displacement function expression of each section of the theoretical profile curve is as follows:
a first stage: s1＝10[(31/π)-sin(31)/(π)]；
And a second stage:
a third stage: s3＝40-10[3(π-3)/π-sin[3(π-3)]/(π)]；
A fourth stage: s4＝40-10[3(4-π)/π-sin[3(4-π)]/(π)]；
A fifth stage:
a sixth stage: s6＝10[3(2π-6)/π-sin[3(2π-6)]/π]；
Wherein,1to6The values of six sections of corner intervals after the cam corners are evenly divided are sequentially obtained.
As a still further scheme of the invention: and each section of the theoretical profile curve of the cam is in smooth transition.
Compared with the prior art, the invention has the beneficial effects that: the cam follower corresponding to the three cams drives the plunger to move at a constant speed, so that the output flow of the pump is a constant value, and the cam follower is always in contact with the cams in the high-speed movement process, thereby improving the transmission precision of the constant-diameter cam set for the pulse-free constant-flow three-plunger pump and prolonging the service life of the constant-diameter cam set for the pulse-free constant-flow three-plunger pump.
Drawings
Fig. 1 is a schematic structural diagram of an equal-diameter cam group for a pulse-free constant-flow triple plunger pump in the embodiment of the invention.
FIG. 2 is a schematic structural diagram of a cam and a roller according to an embodiment of the present invention.
Fig. 3 is a graph of speed (cam angle on the horizontal axis and speed on the vertical axis) for a single cam cycle in an embodiment of the present invention.
Fig. 4 is a graph of acceleration in one cycle of a single cam in an embodiment of the present invention (cam angle on the horizontal axis and acceleration on the vertical axis).
Fig. 5 is a graph of simulated velocity of three plungers during one cycle according to an embodiment of the present invention (cam angle on the horizontal axis and velocity on the vertical axis).
FIG. 6 is a profile view of a single cam in an embodiment of the present invention.
In the drawings: 1. a shaft; 21. a first cam; 22. a second cam; 23. a third cam; 31. a first roller; 32. and a second roller.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Referring to fig. 1, in the embodiment of the present invention, an equal-diameter cam set for a pulse-free constant-flow three-plunger pump includes three cams coaxially installed, an angle difference between any two cams is 120 °, and a lift range and a return stroke angle of the cams are equal; the cam is provided with a cam follower in a matching way, and the cam follower drives the plunger to reciprocate.
Specifically, three identical cams are sequentially mounted on the shaft 1 as a first cam 21, a second cam 22 and a third cam 23, the angle difference between the first cam 21 and the second cam 22 is 120 degrees, the angle difference between the second cam 22 and the third cam 23 is 120 degrees, and the angle difference between the first cam 21 and the third cam 23 is 120 degrees; the lift and return angles of the first cam 21, the second cam 22 and the third cam 23 are all 180 degrees, and the lift is 40 mm; the base circle radius is 48.5 mm. The theoretical profile curve of the first cam 21, the second cam 22 or the third cam 23 is configured by the cam rotation angle theta, and the theoretical profile curve is averagely divided into six sections, so that the cam profile is ensured to be round and smooth, the motion speed of the cam follower can be continuously and stably, and the acceleration of the cam follower cannot be suddenly changed.
Further, as shown in fig. 3 and 4, displacement sections of each section of the cam theoretical profile curve are provided, and the first section is a lift acceleration section1＝[0，π/3]At the moment, the speed of the cam follower is increased, the speed is increased by sine acceleration, the acceleration is increased from 0 and then reduced to 0, and when the acceleration is reduced to 0, the speed of the follower reaches a second-stage constant speed value; the second section is a lift uniform speed section2＝[0，2π/3]The speed of the cam follower is constant, the speeds of the first section and the second section are stably connected, and the flow output is constant; the third section is a lift deceleration section3＝[0，π]At this time, it is convexThe speed of the wheel follower is reduced by sine acceleration until the speed is reduced to 0, and the displacement of the cam follower reaches the top end; the fourth section is a return stroke acceleration section4＝[0，4π/3]At the moment, the cam follower moves back, the speed is increased from 0 by sine acceleration until the speed reaches a constant speed value in the fifth stage; the fifth section is a return uniform speed section5＝[0，5π/3]At the moment, the cam follower moves back, the speed is constant, and the acceleration value is 0; the sixth section is a return-stroke deceleration section6＝[0，2π](ii) a At this point the cam follower moves back and the speed decreases with a sinusoidal acceleration until the speed is 0 and the cam has just rotated one revolution. And each section is in smooth transition, so that the transmission stability is kept; the displacement function expression of each section of the theoretical profile curve is as follows:
a first stage: s1＝10[(31/π)-sin(31)/(π)]；
And a second stage:
a third stage: s3＝40-10[3(π-3)/π-sin[3(π-3)]/(π)]；
A fourth stage: s4＝40-10[3(4-π)/π-sin[3(4-π)]/(π)]；
A fifth stage:
a sixth stage: s6＝10[3(2π-6)/π-sin[3(2π-6)]/π]；
Wherein,1to6The values of six sections of corner intervals after the cam corners are evenly divided are sequentially obtained.
According to each section of displacement function curve, the corresponding rectangular coordinate of the cam theoretical profile curve is obtained as follows:
x＝(r0+s)sin
y＝(r0+s)cos
in the formula r0Is the radius of the base circle, s is the displacement, and is the value of the corner interval of the cam corner theta.
The cam theoretical profile curve is the displacement curve of the roller center, and the cam theoretical profile subtracts the roller radius r in the normal directionrI.e. the actual profile of the cam. Therefore, when the theoretical contour point of the cam is known, the normal direction of the point of the theoretical contour of the cam is subtracted by the radius r of the rollerrAnd obtaining the corresponding actual contour points of the cam.
The expression of the right-angle coordinate corresponding to the actual profile curve of the cam is as follows:
dx/d＝(ds/d)sin+(r0+s)cos
dy/d＝(ds/d)cos-(r0+s)sin
x1＝x-rrcosθ
y1＝y-rrsinθ
(x1，y1) The curve representing the actual profile of the cam corresponds to a rectangular coordinate.
When the motor drives the first cam 21, the second cam 22 and the third cam 23 through the shaft, when the first cam 21 is in the first section: the lift acceleration section, the second cam 22 is in the second section: the lift constant speed section, the third cam 23 is in the third section: and in the lift deceleration section, the speeds of the three plungers are twice as high as the speed of the plunger in uniform motion. By analogy, the forward movement combined speed of the three plungers is always twice of the speed of the uniform movement stage, so that the output flow of the plunger pump is constant.
Referring to fig. 1, 2 and 6, in another embodiment of the present invention, the cam is a constant diameter cam, the constant diameter cam is provided with a mounting hole and a key slot, and the constant diameter cam is mounted on the shaft 1 through the mounting hole and the key slot.
A key groove matched with the key and the key groove is also formed in the shaft 1, and the position of the key groove meets the condition that after the three equal-diameter cams are installed, the difference between each pair of equal-diameter cams is 120 degrees; the shaft shoulder is also arranged for limiting and restricting the constant diameter cams, and the three constant diameter cams are arranged on the shaft 1 through the clamping ring and the shaft sleeve.
In another embodiment of the invention, the cam follower comprises a roller and a connecting rod, the two rollers which are oppositely arranged on the side of the constant-diameter cam are in contact connection with the constant-diameter cam, the wheel center connecting line of the two rollers passes through the hole center of the mounting hole, and the wheel center distance of the two rollers is kept constant in the process of contacting with the constant-diameter cam; the two rollers are connected through a connecting rod, and when the equal-diameter cam drives one of the rollers to move, the other roller is driven by the connecting rod to move synchronously. Both rollers have a radius of 23.5 mm.
The two rollers are a roller I31 and a roller II 32 respectively, specifically, when the constant diameter cam moves in a lifting mode, the constant diameter cam and the roller I31 have a stress effect, and the roller II 32 moves along with a connecting rod between the two rollers, so that the roller II 32 and the constant diameter cam are not stressed but are always kept in right contact. When the constant diameter cam moves in a return stroke, the effect is opposite, the constant diameter cam and the roller two 32 have stress action, and the roller one 31 moves along with the connecting rod between the two rollers, so that the roller one 31 and the constant diameter cam are not stressed but always keep just contact. The connecting rod is alternately driven by one of the two rollers to realize the reciprocating of the plunger, and the return mechanism replacing the plunger in the prior art is a spring return mechanism, so that the noise is reduced, and the output precision of the pump is also improved.
Referring to fig. 5, in another embodiment of the present invention, three cam followers are provided to keep the speed of the plunger constant.
Curve I is the speed curve of the plunger driven by the first cam 21, curve II is the speed curve of the plunger driven by the second cam 22, and curve III is the speed curve of the plunger driven by the third cam 23; when the first cam 21 is in a lift acceleration section, the second cam 22 is in a lift constant speed section, and the third cam 23 is in a lift deceleration section; three plunger speeds and twice the speed of the plunger in uniform motion. By analogy, the forward movement combined speed of the three plungers is always twice as high as that of the constant-speed movement stage thereof.
Further, the rotation period of the cam is the same as the reciprocating period of the plunger, and the lift starting time of the cam coincides with the starting time of the reciprocating movement of the plunger. The cam followers corresponding to the three cams drive the plunger to move at a constant speed, so that the output flow of the pump is at a constant value.
The working principle of the invention is as follows: the theoretical profile curve of the first cam 21, the second cam 22 or the third cam 23 is configured by a cam rotation angle theta, the theoretical profile curve is evenly divided into six sections, when the first cam 21 is in a lift acceleration section, the second cam 22 is in a lift constant speed section, and the third cam 23 is in a lift deceleration section; three plunger speeds and twice the speed of the plunger in uniform motion. By analogy, the forward movement combined speed of the three plungers is always twice of the speed of the constant-speed movement stage; the output flow of the pump is a constant value, and the cam driven piece is always contacted with the cam in the high-speed movement process, so that the transmission precision of the constant-diameter cam group for the pulse-free constant-flow triple plunger pump is improved.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (9)
1. A constant-diameter cam set for a pulse-free constant-flow three-plunger pump is characterized by comprising three cams which are coaxially arranged, wherein the angle difference between any two cams is 120 degrees, and the lift range and the return stroke angle of the cams are equal; the cam is provided with a cam follower in a matching way, and the cam follower drives the plunger to reciprocate.
2. The constant-flow, pulse-free triple-plunger pump constant-diameter cam set according to claim 1, wherein the cam is a constant-diameter cam, the constant-diameter cam is provided with a mounting hole and a key groove, and the constant-diameter cam is mounted on the shaft through the mounting hole and the key groove.
3. The constant-diameter cam set for the pulseless constant-flow triple-plunger pump according to claim 2, wherein the cam follower comprises a roller and a connecting rod, the two rollers oppositely arranged on the side of the constant-diameter cam are in contact connection with the constant-diameter cam, a connecting line of the centers of the two rollers passes through the center of the mounting hole, and the distance between the centers of the two rollers is kept constant during the contact with the constant-diameter cam.
4. The constant-flow pulse-free cam set for a triple plunger pump according to claim 3, wherein the two rollers are connected through a connecting rod, and when the constant-flow cam drives one of the rollers to move, the other roller is synchronously driven by the connecting rod to move.
5. The constant flow, constant pulse triple plunger pump as defined in claim 1, wherein the three cam followers move the plunger at a constant speed.
6. The constant-flow, constant-pulse-rate three-plunger pump constant-diameter cam set according to claim 1, wherein the rotation period of the cam is the same as the reciprocating period of the plunger, and the lift start time of the cam coincides with the start time of the reciprocating movement of the plunger.
7. The constant-flow, constant-pulse-rate three-plunger pump constant-diameter cam set as claimed in claim 1, wherein the lift and return angle of each cam are 180 degrees, and the lift is 40 mm.
8. The constant-flow constant-pulse constant-diameter cam set for the triple-plunger pump according to claim 7, wherein a theoretical profile curve of the cam is configured by a cam rotation angle, and displacement function expressions of each section of the theoretical profile curve are as follows:
a first stage: s1＝10[(31/π)-sin(31)/(π)]；
And a second stage:
a third stage: s3＝40-10[3(π-3)/π-sin[3(π-3)]/(π)]；
A fourth stage: s4＝40-10[3(4-π)/π-sin[3(4-π)]/(π)]；
A fifth stage:
a sixth stage: s6＝10[3(2π-6)/π-sin[3(2π-6)]/π]；
Wherein,1to6The values of six sections of corner intervals after the cam corners are evenly divided are sequentially obtained.
9. The constant flow, constant pulse triple plunger pump of claim 8 wherein the segments of the theoretical profile curve of the cam are smoothly transitioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011003384.4A CN112128094A (en) | 2020-09-22 | 2020-09-22 | Constant-diameter cam group for pulse-free constant-flow three-plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011003384.4A CN112128094A (en) | 2020-09-22 | 2020-09-22 | Constant-diameter cam group for pulse-free constant-flow three-plunger pump |
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| Publication Number | Publication Date |
|---|---|
| CN112128094A true CN112128094A (en) | 2020-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011003384.4A Pending CN112128094A (en) | 2020-09-22 | 2020-09-22 | Constant-diameter cam group for pulse-free constant-flow three-plunger pump |
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| CN (1) | CN112128094A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113496063A (en) * | 2021-07-29 | 2021-10-12 | 保定雷弗流体科技有限公司 | Cam structure design method of extrusion type peristaltic pump and extrusion type peristaltic pump |
| CN114718859A (en) * | 2022-04-07 | 2022-07-08 | 北京理工大学 | Single pulse hydraulic pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113496063A (en) * | 2021-07-29 | 2021-10-12 | 保定雷弗流体科技有限公司 | Cam structure design method of extrusion type peristaltic pump and extrusion type peristaltic pump |
| CN114718859A (en) * | 2022-04-07 | 2022-07-08 | 北京理工大学 | Single pulse hydraulic pump |
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Application publication date: 20201225 |