CN113110626A - Rectangular transparent adjustable venturi - Google Patents
Rectangular transparent adjustable venturi Download PDFInfo
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- CN113110626A CN113110626A CN202110468136.5A CN202110468136A CN113110626A CN 113110626 A CN113110626 A CN 113110626A CN 202110468136 A CN202110468136 A CN 202110468136A CN 113110626 A CN113110626 A CN 113110626A
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- 239000012530 fluid Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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Abstract
The application relates to the technical field of aerospace, in particular to a rectangular transparent adjustable venturi. A rectangular transparent adjustable venturi comprises a venturi shell, an adjusting component and a sliding piece; the sliding piece is arranged in the venturi tube shell, and a flow passage is formed between the sliding piece and the side wall of the venturi tube shell; an inlet end and an outlet end are respectively arranged on the venturi tube shell at the two ends of the corresponding flow channel; one end of the adjusting component is connected with the sliding part, and the adjusting component can drive the sliding part to move along the direction perpendicular to the axis of the flow passage so as to change the cross-sectional area of the flow passage. The flow passage of the present application is formed between the slider and the side wall of the venturi housing, and when the slider is driven to move in a direction perpendicular to the axis of the flow passage, a wide range of flow regulation can be achieved.
Description
Technical Field
The application relates to the technical field of aerospace, in particular to a rectangular transparent adjustable venturi.
Background
When the adjustable cavitation venturi tube is used for adjusting the flow, the purpose of adjusting the flow is achieved by adopting a mode of moving the valve core, specifically, moving the valve core to change the annular area formed between the valve core and the throat part; however, with this configuration, it is difficult to achieve a wide range of flow regulation and to observe the flow of liquid inside the venturi.
Therefore, a rectangular transparent adjustable cavitation venturi is needed to solve the technical problems in the prior art to a certain extent.
Disclosure of Invention
The application aims to provide a rectangular transparent adjustable venturi tube, and solves the technical problem that the conventional venturi tube is difficult to realize large-scale flow regulation to a certain extent.
The application provides a rectangular transparent adjustable venturi, which comprises a venturi shell, an adjusting component and a sliding piece, wherein the venturi shell is provided with a cavity;
the sliding piece is arranged in the venturi tube shell, and a flow passage is formed between the sliding piece and the side wall of the venturi tube shell; an inlet end and an outlet end are respectively arranged on the venturi tube shell corresponding to the two ends of the flow passage;
one end of the adjusting component is connected with the sliding part, and the adjusting component can drive the sliding part to move along the direction perpendicular to the axis of the flow passage so as to change the cross-sectional area of the flow passage.
In the above technical solution, further, the apparatus further comprises a perspective member; the perspective component is arranged on the shell and corresponds to the flow channel.
In the above technical solution, further, the perspective member includes an observation window and a leakage-proof ring;
the observation window is fixed on the venturi tube shell through the first fastening bolt and is arranged corresponding to the flow channel;
the anti-leakage ring is arranged between the observation window and the venturi tube shell and used for sealing the observation window on the venturi tube shell.
In the above technical solution, further, the electric vehicle further comprises an electric cylinder; the electric cylinder comprises a servo driving motor, a motor shell and a ball screw;
the motor shell is internally provided with an accommodating space, and the ball screw is connected with an output shaft of the servo driving motor and is arranged in the accommodating space;
the fixed part of the adjusting component is sleeved on the ball screw.
In the above technical solution, further, the system further comprises a control unit;
the control unit comprises a PLC (programmable logic controller), a servo drive motor encoder and a servo drive motor controller electrically connected with the PLC;
the servo driving motor controller is electrically connected with the servo driving motor, the receiving end of the servo driving motor encoder is electrically connected with the servo driving motor, and the transmitting end is electrically connected with the servo driving motor controller;
the PLC controller can transmit a preset instruction signal to the servo driving motor controller, and the servo driving motor controller which receives the preset instruction signal is used for controlling the servo driving motor to move so as to enable the adjusting assembly to move along the direction vertical to the axis of the flow channel;
the servo drive motor encoder is used for recording the running speed and the rotating direction of an output shaft of the servo drive motor and feeding back the recorded running speed data and rotating direction data to the servo drive motor controller.
In the above technical solution, further, the apparatus further comprises a reset assembly; the reset assembly is electrically connected with the PLC;
the reset assembly comprises a magnetic ring and at least three magnetic limit switches which are arranged on the motor shell at intervals, and the position of the magnetic limit switch close to the venturi tube shell is the original position;
the magnetic ring is arranged on the fixing part;
when the fixing part moves along the direction perpendicular to the axis of the flow channel, the magnetic ring can trigger different magnetic limit switches to act, the PLC can receive action signals of the magnetic limit switches and transmit preset command signals to the servo drive motor controller according to the action signals, and therefore the fixing part is reset to the original point position.
In the above technical solution, further, three magnetic limit switches are provided, and the three magnetic limit switches are an upper limit switch, a warning limit switch and a lower limit switch respectively;
the warning limit switch is arranged between the upper limit switch and the lower limit switch; the lower limit switch corresponds to the origin position;
the servo driving motor controller can respectively control the servo driving motor to move at a first speed and a first rotating direction so as to enable the magnetic ring to move towards the upper limit switch, the servo driving motor to move at the first speed and a second rotating direction so as to enable the magnetic ring to move towards the warning limit switch, and the servo driving motor to move at a second speed and the second rotating direction so as to enable the magnetic ring to move towards the lower limit switch, and when the magnetic ring moves to the original point position, the fixing part is reset.
In the above technical solution, further, the reset assembly further includes a stopper disposed between the electric cylinder and the venturi housing;
a first accommodating part, a second accommodating part and a third accommodating part are sequentially arranged in the limiting block from the end part close to the electric cylinder to the end part close to the venturi tube shell, and the third accommodating part is communicated with the flow channel;
the first accommodating part, the second accommodating part and the third accommodating part are in a step shape;
the adjusting part of the adjusting assembly sequentially penetrates through the first accommodating part, the second accommodating part and the third accommodating part and is connected with the sliding part.
In the above technical solution, further, the pipe joint further includes an inlet pipe joint member;
the inlet pipe joint member comprises an inlet pipe joint, a first gasket and a first anti-leakage ring;
the inlet pipe joint is arranged on the venturi shell corresponding to the inlet end;
the first anti-leakage ring is arranged between the inlet pipe joint and the inner side wall of the venturi tube shell;
the first gasket is disposed between the inlet fitting and an outer sidewall of the venturi housing.
In the above technical solution, further, the pipe joint further includes an outlet pipe joint member;
the outlet pipe joint member comprises an outlet pipe joint, a second gasket and a second anti-leakage ring;
the outlet pipe connector is arranged on the venturi tube shell corresponding to the outlet end;
the second anti-leakage ring is arranged between the outlet pipe joint and the inner side wall of the venturi tube shell; the second gasket is disposed between the outlet tube fitting and an outer sidewall of the venturi housing.
Compared with the prior art, the beneficial effect of this application is:
the application provides a rectangular transparent adjustable venturi, which comprises a venturi shell, an adjusting component and a sliding piece, wherein the venturi shell is provided with a first end and a second end;
the sliding piece is arranged in the venturi tube shell, and a flow passage is formed between the sliding piece and the side wall of the venturi tube shell; an inlet end and an outlet end are respectively arranged on the venturi tube shell corresponding to the two ends of the flow passage;
one end of the adjusting component is connected with the sliding part, and the adjusting component can drive the sliding part to move along the direction perpendicular to the axis of the flow passage so as to change the cross-sectional area of the flow passage.
In particular, the flow passage of the present application is formed between a slider and a sidewall of the venturi housing, which enables a wide range of flow regulation when the slider is driven in a direction perpendicular to the axis of the flow passage.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic plan view of a rectangular transparent adjustable venturi provided herein at a first viewing angle;
FIG. 2 is an enlarged view of structure A in FIG. 1;
FIG. 3 is a schematic diagram of a venturi housing in a rectangular transparent adjustable venturi provided herein;
FIG. 4 is a schematic diagram of a structure of a rectangular transparent adjustable venturi provided by the present application with a venturi housing removed;
fig. 5 is a schematic plan view of a rectangular transparent adjustable venturi provided in the present application at a second viewing angle.
Reference numerals:
100-a venturi housing; 101-a regulating assembly; 102-a slide; 103-a flow channel; 104-a constriction; 105-a transition section; 106-an expansion section; 107-a stationary part; 108-an adjustment section; 109-a see-through member; 110-a viewing window; 111-a first anti-leakage ring; 112-a first fastening bolt; 115-motor housing; 116-a groove; 117-ball screw; 118-a reset component; 119-upper limit switch; 120-warning limit switch; 121-lower limit switch; 124-a limiting block; 128-an inlet pipe joint member; 129-inlet pipe joint; 130-a first shim; 131-a second anti-leakage ring; 132-an outlet pipe joint member; 133-outlet pipe connection; 134-a second gasket; 135-third leakage prevention ring; 136-fourth anti-leakage ring; 137-a fifth leakage prevention ring; 138-second fastening bolt; 139-third fastening bolt; 140-a fourth fastening bolt; 141-sixth anti-leakage ring; 142-an adjustment lever; 143-connecting block.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments.
The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
A rectangular transparent adjustable venturi provided by the present application is described below with reference to fig. 1 to 5.
The application provides a rectangular transparent adjustable venturi, which comprises a venturi shell 100, an adjusting component 101 and a sliding piece 102;
the sliding member 102 is disposed in the venturi housing 100, and a flow passage 103 is formed between the sliding member and a side wall of the venturi housing 100; an inlet end and an outlet end are respectively arranged on the venturi housing 100 corresponding to the two ends of the flow passage 103;
one end of the adjusting assembly 101 is connected to the sliding member 102, and the adjusting assembly 101 can drive the sliding member 102 to move along the direction perpendicular to the axis of the flow passage 103 so as to change the cross-sectional area of the flow passage 103.
Specifically, in the present application, the flow channel 103 formed between the sliding member 102 and the side wall of the venturi housing 100 is a rectangular structure, when the sliding member 102 is driven to move along the direction perpendicular to the axis of the flow channel 103, a large flow rate adjustment range can be achieved, even an ultra-large flow rate adjustment ratio can be achieved, and when the sliding member 102 is very close to the side wall of the venturi housing 100 and slightly attached to the side wall, a very small flow rate adjustment can be achieved.
Specifically, the inner side walls of the venturi housing 100 cooperate with the slide to provide an adjustable minimum flow area to control flow.
More specifically, the flow passage 103 has a convergent section 104, a transition section 105, and a divergent section 106 connected in series.
In addition, the driving shaft and the fluid outlet direction of the existing cavitation-adjusting venturi are on the same straight line, and the fluid inlet direction and the fluid outlet direction are often ninety degrees, however, once the pressure drop is large, the transition section 105 cannot be cavitated, and the downstream pressure can affect the transition section 105, so that the upstream pressure is unstable, and the flow control has a certain deviation; and in this application, the inlet end and the outlet end are arranged oppositely, that is, the flow channel 103 formed by the inlet end and the outlet end is a linear flow channel 103, so that the bending condition does not exist, the great pressure drop loss cannot be caused, the upstream pressure is relatively stable, and the control precision of the flow is improved.
In this embodiment, in order to observe the flow rate of the liquid in the flow channel 103 at any time and observe whether the cavitation phenomenon occurs at any time, and to facilitate the analysis of the flow field of the flow channel 103 inside the venturi, the rectangular transparent adjustable venturi further includes a perspective member 109; the see-through member 109 is disposed on the housing and corresponds to the flow channel 103.
Wherein the perspective member 109 comprises a viewing window 110 and a first anti-leakage ring 111; the observation window 110 is fixed on the venturi housing 100 by the first fastening bolt 112 and is disposed corresponding to the flow passage 103; the first anti-leakage ring 111 is disposed between the observation window 110 and the venturi housing 100, and is used for sealing the observation window 110 on the venturi housing 100.
In particular, due to the internal closure of the venturi, it is difficult to observe the phenomenon of internal liquid flow; the application provides a transparent venturi tube is applicable to test experiments, and in the experimental process, the cavitation phenomenon can be used for mechanism research by acquiring flow field information through a shooting and recording device. And similarly, whether cavitation occurs in the adjustable venturi can be directly judged from the image processing direction in a machine vision mode, and even whether cavitation occurs in the venturi can be judged visually.
Specifically, the observation window 110 is formed by processing a perm plate, which integrates the advantages of high strength, high toughness, high thickness, high transparency, and the like; the viewing window 110 of the perm plate material can withstand high pressures up to several megapascals, or even tens of megapascals, of the fluid internal flow channel 103; in addition, the viewing window 110 made of the parm plate has a certain thickness and also has the advantage of high transparency, so that an operator can clearly observe the fluid flow and the cavitation phenomenon inside the venturi tube from the outside.
Further, the viewing window 110 is preferably circular.
Specifically, the number of the first fastening bolts 112 is plural, preferably 15, and after repeated experiments, the 15 first fastening bolts 112 can bear the pressure applied to the observation window 110 by the fluid pressure, and fasten the observation window 110 and the venturi housing 100.
Specifically, the first anti-leakage ring 111 is matched with the observation window 110 and the venturi casing 100 to prevent the fluid inside the adjustable venturi from leaking, so as to achieve the sealing effect.
In this embodiment, the adjusting assembly 101 includes an adjusting rod 142, and an adjusting portion 108 is formed on one end of the adjusting rod 142 adjacent to the venturi housing 100, and a fixing portion 107 is formed on one end adjacent to the electric cylinder.
In this embodiment, an electric cylinder, preferably a servo electric cylinder, is further included, and the servo electric cylinder functions to convert a rotational motion into a linear motion, as compared to a conventional stepping motor. The servo electric cylinder is a modularized product integrating a servo driving motor and a lead screw, converts the rotary motion of the servo driving motor into linear motion, and simultaneously retains the maximum advantages of the servo driving motor: the accurate rotating speed, the rotating speed and the torque are controlled and converted into accurate speed, displacement and thrust control, and finally high-precision linear motion control can be realized. In this embodiment, in order to save space, it is preferable to employ a fold-back type electric cylinder in which a belt drive of a synchronous pulley is added.
Specifically, the electric cylinder includes a servo drive motor, a motor housing 115, and a ball screw 117; the motor housing 115 is internally provided with an accommodating space, and the ball screw 117 is connected with an output shaft of the servo drive motor and is arranged in the accommodating space; the fixing portion 107 of the adjusting assembly 101 is sleeved on the ball screw 117.
In the actual working process, a servo control system can be used to control the electric cylinder, so as to achieve accurate adjustment of the position, state and orientation of the adjusting assembly 101, wherein the servo control system is a prior art, and is briefly described as follows: the servo control system is mainly positioned by pulses, and when the servo driving motor receives 1 pulse, the servo driving motor rotates by an angle corresponding to the 1 pulse, so that the displacement of the ball screw 117 is realized; furthermore, a closed-loop system can be realized between the pulses received by the servo drive motor and the pulses fed back by the servo drive motor, so that the rotation of the servo drive motor is accurately controlled, and the accurate adjustment of the adjusting component 101 is realized; typically the precision of the repeated positioning of the adjustment assembly 101 is up to 0.002 mm. Meanwhile, the servo driving motor can also realize quick response, the adjusting speed can reach 100mm/s under the conditions that the lead screw lead is 2mm and the rated rotating speed of the motor is 3000 r/min, the rotating speed of the motor can be increased to 6000 r/min under special conditions, and the adjusting speed can reach 200mm/s at most.
In this embodiment, a control unit is also included; the control unit comprises a PLC (programmable logic controller), a servo drive motor encoder and a servo drive motor controller electrically connected with the PLC; the servo driving motor controller is electrically connected with the servo driving motor, the receiving end of the servo driving motor encoder is electrically connected with the servo driving motor, and the transmitting end is electrically connected with the servo driving motor controller; the PLC controller can transmit a preset instruction signal to the servo drive motor controller, and the servo drive motor controller which receives the preset instruction signal is used for controlling the servo drive motor to move so as to enable the adjusting assembly 101 to move along the direction perpendicular to the axis of the flow channel 103; the servo drive motor encoder is used for recording the running speed and the rotating direction of an output shaft of the servo drive motor and feeding back the recorded running speed data and rotating direction data to the servo drive motor controller.
In this embodiment, a reset component 118 is also included; the reset assembly 118 is electrically connected with the PLC controller; the reset component 118 comprises a magnetic ring and at least three magnetic limit switches which are arranged on the motor shell 115 at intervals, and the position of the magnetic limit switch close to the venturi tube shell is the original position; the magnetic ring is arranged on the fixing part 107;
when the fixing portion 107 moves in the direction perpendicular to the axis of the flow channel 103, the magnetic ring triggers different magnetic limit switches to act, and the PLC controller can receive an action signal of the magnetic limit switches and transmit a preset instruction signal to the servo drive motor controller according to the action signal, so that the fixing portion 107 is reset to the original position.
In this embodiment, there are three magnetic limit switches, which are an upper limit switch 119, a warning limit switch 120, and a lower limit switch 121;
the warning limit switch 120 is arranged between the upper limit switch 119 and the lower limit switch 121; the lower limit switch 121 corresponds to the origin position;
the servo drive motor controller can control the servo drive motor to move at a first speed and a first rotation direction to move the magnetic ring towards the upper limit switch 119, the servo drive motor to move at the first speed and a second rotation direction to move the magnetic ring towards the warning limit switch 120, and the servo drive motor to move at a second speed and the second rotation direction to move the magnetic ring towards the lower limit switch 121, respectively, when the magnetic ring moves to the origin position, the fixing part 107 is reset.
Specifically, in this embodiment, the limiting position is reached by the mutual cooperation of three magnetic limit switches (the upper limit switch 119, the warning limit switch 120, and the lower limit switch 121), and the most important function is to enable the adjusting component 101 to return to zero accurately after the venturi tube performs a task, so as to establish a reference, avoid error accumulation caused by multiple uses, and facilitate multiple uses.
In order to ensure the repeatability of venturi control and the accuracy of origin regression, an upper limit switch 119, a warning limit switch 120 and a lower limit switch 121 are installed in a groove 116 at the upper part of the electric cylinder; the principle of the magnetic limit switch is that a ball screw 117 in an electric control cylinder is fixedly connected with a fixing part 107 of an adjusting assembly 101, and a magnetic ring is arranged on the ball screw 117, so that the magnetic ring and the fixing part 107 move synchronously, when the magnetic ring moves to the position near the magnetic limit switch, the magnetic field intensity is enhanced, and the magnetic limit switch is closed under the magnetic action; when the magnetic ring is far away from the magnetic limit switch, the magnetic field intensity is reduced, and the magnetic limit switch is disconnected. The specific working process is as follows: when the task is finished or an origin return instruction is received, the fixing portion 107 of the adjusting component 101 starts to move close to the upper limit switch 119 at a constant speed, and after the magnetic ring touches the upper limit switch 119, the fixing portion 107 of the adjusting component 101 stops and moves in a reverse direction at a constant speed until the magnetic ring touches the warning limit switch 120, the warning limit switch 120 is closed, the moving speed of the fixing portion 107 of the adjusting component 101 is slowed, the fixing portion 107 of the adjusting component 101 is closed to the lower limit switch 121 at a constant low speed, and the fixing portion 107 of the adjusting component 101 stops moving until the lower limit switch 121 is touched, where the fixing portion is the origin (the position where the lower limit switch 121 is located is the origin position). Since the origin is returned at a constant low speed each time to the lower limit switch 121 as the origin, the accuracy can be improved.
Whether the original point of regression can both detect three limit magnetic switch and normally work at every turn, if when adjusting component 101's fixed part 107 moved to corresponding position, PLC did not receive the signal that magnetic limit switch returned, showed this sensor goes wrong, adjusting component 101's fixed part 107 stop motion, the PLC control panel will report the mistake.
More specifically, three magnetic limit switches are matched with hardware through software, and different control schemes can be provided for the same flow regulation process to further improve the control accuracy. Three control schemes that can be implemented are given in this application:
in the first control scheme, each time the fixing portion 107 of the adjusting assembly 101 starts to work, the fixing portion 107 of the adjusting assembly 101 quickly reaches the upper magnetic limit switch, then reaches the warning limit switch 120, and then reaches the lower limit switch 121 at a constant low speed to return to the original point according to the movement manner.
When receiving the flow regulation command, the PLC sends a corresponding pulse at a certain frequency, so that the fixed part 107 of the regulation assembly 101 reaches the corresponding position; when the command for adjusting the flow rate is received again, that is, when the flow rate needs to be changed again, in order to improve the control accuracy, the magnetic limit switch is used again, the fixing portion 107 of the adjusting assembly 101 reaches the upper limit switch 119 again at a constant speed, then reaches the warning limit switch 120, then reaches the lower limit switch 121 again at a constant low speed, returns to the original point, and then clears the pulse number. Then, the PLC control board sends a certain pulse number to move the fixing part 107 of the adjusting component 101 to a corresponding position.
In summary, the magnetic limit switch as hardware is used to assist returning to the original point, and the fixing portion 107 of the adjusting assembly 101 reaches the target position again.
In the second control scheme, after the device is started, the fixing part 107 of the adjusting component 101 is moved to the original point in the manner described above, and when a flow adjusting instruction is received, the PLC transmits a corresponding pulse at a certain frequency, so that the fixing part 107 of the adjusting component 101 reaches a corresponding position; when the flow rate change instruction is received again, the magnetic limit switch closest to the current is judged through the logic operation and the four arithmetic operations of the PLC control board, then the magnetic limit switch is approached at a constant low speed, when the switch detects the fixing part 107 of the adjusting assembly 101, the fixing part 107 of the adjusting assembly 101 stops, and at the moment, the pulse number in the PLC control board is changed into the pulse number corresponding to the magnetic limit switch. The reason for this operation is that when the fixing portion 107 of the adjusting component 101 is at different positions, corresponding to different pulse numbers, for example, the lower limit switch 121 is used as an origin, the corresponding pulse number is 0, and the positions of the other two magnetic limit switches are calibrated in advance, in the calibrating method, the fixing portion 107 of the adjusting component 101 starts from the origin and approaches the warning limit switch 120 at a constant low speed, when the warning limit switch 120 approaches to be closed, the fixing portion 107 of the adjusting component 101 stops moving, the pulse number at this time is recorded, and the pulse number corresponds to the actual position of the warning limit switch 120; similarly, the upper limit switch 119 is calibrated, and the position of the upper limit switch corresponds to a certain pulse number.
In the third control scheme, after the computer is started, the original point is returned in the mode. When receiving the command to adjust the flow, the PLC sends a corresponding pulse at a frequency such that the fixed part 107 of the adjustment assembly 101 reaches the corresponding position. When the flow regulation instruction is received again, namely the flow needs to be changed again, the fixing part 107 of the regulation component 101 is quickly close to the original point, when the flow is close to the original point, the flow reaches the lower limit switch 121 at a constant low speed, then the lower limit switch 121 is closed, the pulse number is cleared, the PLC control board sends the corresponding pulse number again, and the fixing part 107 of the regulation component 101 moves to the corresponding position.
The third embodiment can be implemented on the premise that the pulse number is recorded in an absolute positioning manner, that is, different positions correspond to different pulse numbers, and when the fixing portion 107 of the adjusting assembly 101 is quickly close to the original point, the pulse number recorded by the PLC control board is quickly reduced. When the number of pulses is lower than a certain value, the PLC control board can determine that the fixing portion 107 of the adjusting component 101 is close to the lower limit switch 121, and thus the fixing portion 107 of the adjusting component 101 reaches the origin at a constant low speed by changing the output pulse frequency, thereby improving the control accuracy.
In summary, in order to improve the control accuracy and reduce the response time, i.e. improve the displacement accuracy and speed of the fixing part 107 of the adjusting assembly 101, the fixing part 107 of the adjusting assembly 101 is driven by an electric cylinder, which is a linear motion mechanism combining a high-accuracy servo driving motor and a high-accuracy ball screw, by means of the high-accuracy displacement control and fast response of the electric cylinder, instead of a conventional stepping motor, thereby achieving the accurate control of the flow rate.
In the actual working process, the PLC transmits a preset instruction signal to the servo drive motor controller, the preset instruction signal is a pulse instruction, the servo drive motor controller drives the servo drive motor to rotate according to the corresponding speed and direction after receiving the pulse instruction, and the rotary motion of the servo drive motor is converted into the linear motion of the adjusting mechanism through the transmission mechanism and the ball screw 117. The method comprises the following specific steps:
step 100: through the logic operation and the four arithmetic operations in the PLC controller, the number of pulses which need to be emitted by the PLC controller when a certain liquid flow needs to be adjusted is calculated, for example, when a certain liquid flow needs to be increased, namely, the cross-sectional area of the critical flow passage 103 needs to be increased, the moving distance of the adjusting part 108 can be calculated through a relevant calculation formula of a venturi tube, and then the required rotating angle or the number of turns of the servo driving motor can be calculated through the transmission ratio of a transmission mechanism, the screw pitch of the ball screw shaft 117 and the like; and finally, converting the pulse number of the servo drive motor driver into the pulse number required to be transmitted by the PLC through conversion of an electronic gear ratio.
Step 200: the PLC controller sends a preset number of pulses, and the adjusting part 108 moves, so that the cross-sectional area of the critical flow passage 103 is adjusted, and the flowing flow of the liquid is adjusted; after the pulse frequency and the pulse number of the PLC are received by the servo drive motor controller, the servo drive motor driver sends a certain pulse number at a corresponding pulse frequency, the servo drive motor receives the pulse frequency and the pulse number (wherein the pulse frequency corresponds to the rotating speed of the servo drive motor, and the pulse number corresponds to the rotating angle of the servo drive motor), the servo drive motor rotates at a speed corresponding to the pulse frequency by a corresponding angle, at the moment, the rotation of the servo drive motor is recorded by a servo drive motor encoder, and the encoder feeds the recorded pulse back to the servo drive motor driver; therefore, the servo drive motor driver corresponds to the pulse of the servo drive motor encoder, and because the pulse of the servo drive motor encoder is matched with the pulse of the rotation angle of the servo drive motor, the closed-loop control is formed between the servo drive motor driver and the servo drive motor.
In conclusion, the servo drive system who forms is closed loop control system, and servo drive motor driver can directly sample servo drive motor's encoder feedback signal, and inside has constituted position ring and speed ring, can overcome current adoption open loop step motor and appear losing the phenomenon of pulse, and this application makes control performance more reliable and more stable.
In this embodiment, the reset assembly 118 further includes a stopper 124 disposed between the electric cylinder and the venturi housing;
a first accommodating part, a second accommodating part and a third accommodating part are sequentially arranged in the limiting block 124 from the end part close to the electric cylinder to the end part close to the venturi housing, and the third accommodating part is communicated with the flow passage 103; the first accommodating part, the second accommodating part and the third accommodating part are in a step shape; the adjusting portion 108 of the adjusting assembly 101 sequentially passes through the first accommodating portion, the second accommodating portion, and the third accommodating portion, and is connected to the slider 102.
Specifically, one end of the limit block 124 is fixed to the motor housing 115 by a third fastening bolt 139, the other end of the limit block 124 is connected to a connecting block 143 by a second fastening bolt 138, one end of the connecting block 143 is connected to the venturi housing 100 by a fourth fastening bolt 140, a sixth leakage-proof ring 141 is disposed between the connecting block 143 and the venturi housing 100, a fourth leakage-proof ring 136 is disposed on the inner side wall of the connecting block 143 at the connection with the limit block 124, and a fifth leakage-proof ring 137 is disposed at the connection between the limit block 124 and the adjustment portion 108.
In this embodiment, an inlet fitting member 128 is also included; the inlet pipe joint member 128 includes an inlet pipe joint 129, a first gasket 130, and a second leakage prevention ring 131;
the inlet pipe connector 129 is disposed on the venturi housing 100 corresponding to the inlet end and is adapted to the venturi housing 100, and the inlet pipe connector 129 serves as a general interface and is connected to an external pipe as an inlet of the venturi housing 100.
The second anti-leakage ring 131 is disposed between the inlet pipe joint 129 and the inner sidewall of the venturi housing 100, so as to prevent the fluid inside the venturi housing 100 from leaking, thereby achieving a sealing effect.
The first gasket 130 is disposed between the inlet connector 129 and the outer sidewall of the venturi housing 100, and the first gasket 130 functions to increase a fastening force and prevent the inlet connector 129 from loosening.
In this embodiment, an outlet pipe joint member 132 is further included; the outlet pipe joint member 132 includes an outlet pipe joint 133, a second gasket 134, and a second leakage prevention ring 131;
the outlet pipe joint is disposed on the venturi housing 100 corresponding to the outlet end, and the outlet pipe joint 132 functions as a general interface to be connected with an external pipe as an outlet of the venturi housing 100.
The third anti-leakage ring 135 is disposed between the outlet pipe joint 133 and the inner sidewall of the venturi housing 100; the third anti-leakage ring 135 prevents fluid from leaking from the inside of the venturi housing 100, thereby achieving a sealing effect.
The second gasket 134 is disposed between the outlet pipe joint 133 and the outer sidewall of the venturi housing 100; the second gasket 134 functions to increase the fastening force and prevent the outlet pipe joint 133 from being loosened.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
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| CN202110468136.5A CN113110626B (en) | 2021-04-28 | 2021-04-28 | Rectangular transparent adjustable venturi |
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| CN202110468136.5A CN113110626B (en) | 2021-04-28 | 2021-04-28 | Rectangular transparent adjustable venturi |
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| CN113110626B CN113110626B (en) | 2022-06-24 |
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| CN212297658U (en) * | 2020-04-28 | 2021-01-05 | 上海凯科阀门制造有限公司 | multifunction valve |
| CN112211752A (en) * | 2020-12-08 | 2021-01-12 | 北京星际荣耀空间科技有限公司 | Adjustable venturi tube |
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| DE4325044A1 (en) * | 1993-07-26 | 1995-02-02 | Gema Volstatic Ag | Powder conveying device, in particular for coating powder |
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| CN113110626B (en) | 2022-06-24 |
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