CN113110627B - High-precision, high-reliability and quick-response adjustable venturi - Google Patents
High-precision, high-reliability and quick-response adjustable venturi Download PDFInfo
- Publication number
- CN113110627B CN113110627B CN202110469344.7A CN202110469344A CN113110627B CN 113110627 B CN113110627 B CN 113110627B CN 202110469344 A CN202110469344 A CN 202110469344A CN 113110627 B CN113110627 B CN 113110627B
- Authority
- CN
- China
- Prior art keywords
- servo motor
- magnetic
- venturi
- electric cylinder
- adjusting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The application relates to the technical field of aerospace, in particular to an adjustable venturi tube with high precision, high reliability and quick response. A high-precision high-reliability quick-response adjustable venturi comprises a venturi main body, wherein the venturi main body is provided with an inlet end, an outlet end and a flow passage for communicating the inlet end with the outlet end, and the flow passage comprises a contraction section, a transition section and an expansion section which are connected in sequence; the electric control device also comprises an adjusting component, an electric cylinder and a control unit; the adjusting component is provided with a fixing part and an adjusting part, the fixing part is connected with an output shaft of the electric cylinder, the adjusting part is of a conical structure, and the adjusting part is positioned in the flow channel and can form a critical flow channel with the transition section; the control unit is electrically connected with the electric cylinder; the control unit is through controlling electronic jar in this application for the regulation part moves along the axis direction of runner in the runner, with the cross sectional area who changes critical runner. The electric cylinder is utilized to improve accurate adjustment of the position, state and orientation of the adjustment member.
Description
Technical Field
The application relates to the technical field of aerospace, in particular to an adjustable venturi tube with high precision, high reliability and quick response.
Background
The existing adjustable cavitation venturi is generally circular in cross section, and the minimum flow cross section area at the throat is adjusted through mutual matching of a movable valve core, a contraction section, the throat and an expansion section, so that the purpose of adjusting the flow is achieved.
The existing valve core is controlled by a common motor, errors can exist in the actual displacement of the valve core, and then the actual flow cross-sectional area is inconsistent with the theoretical flow cross-sectional area, so that the accuracy of flow regulation is not high.
Disclosure of Invention
An object of this application is to provide a high reliability quick response's of high accuracy adjustable venturi tube, adopts ordinary motor to control the valve rod in order to solve prior art to a certain extent for the not high technical problem of precision to the flow control.
The application provides an adjustable venturi tube with high precision, high reliability and quick response, which comprises a venturi tube main body, wherein the venturi tube main body is provided with an inlet end, an outlet end and a flow passage for communicating the inlet end with the outlet end, and the flow passage comprises a contraction section, a transition section and an expansion section which are connected in sequence; the electric control device also comprises an adjusting component, an electric cylinder and a control unit;
the adjusting component is provided with a fixing part and an adjusting part, the fixing part is connected with an output shaft of the electric cylinder, the adjusting part is of a conical structure, and the adjusting part is positioned in the flow channel and can form a critical flow channel with the transition section; the control unit is electrically connected with the electric cylinder;
the control unit controls the electric cylinder to enable the adjusting portion to move in the flow channel along the axis direction of the flow channel so as to change the cross-sectional area of the critical flow channel.
In the above technical solution, further, the electric cylinder includes a servo motor, a motor housing, and a ball screw;
the motor shell is internally provided with an accommodating space, the servo motor and the ball screw are positioned in the accommodating space, the ball screw is connected with an output shaft of the servo motor, and the fixing part is sleeved on the ball screw;
the servo motor is electrically connected with the control unit.
In the above technical solution, further, the control unit includes a PLC controller, a servo motor controller electrically connected to the PLC controller, and a servo motor encoder;
the servo motor controller is electrically connected with the servo motor, the receiving end of the servo motor encoder is electrically connected with the servo motor, and the transmitting end is electrically connected with the servo motor controller;
the PLC controller can transmit a preset instruction signal to the servo motor controller, and the servo motor controller which receives the preset instruction signal is used for controlling the servo motor to move so as to enable the adjusting component to move along the axial direction of the flow channel;
the servo motor encoder is used for recording the running speed data and the rotating direction data of the output shaft of the servo motor and feeding back the running speed data and the rotating direction data to the servo motor controller.
In the above technical solution, further, the PLC controller further includes a reset member electrically connected to the PLC controller;
the reset component comprises a magnetic ring and at least three magnetic limit switches which are arranged on the motor shell at intervals, and the vertical plane where the magnetic limit switches close to the venturi tube main body are located is the original point position;
the magnetic ring is arranged on the fixing part;
when the fixing part moves along the axis direction, 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 motor controller according to the action signals, so that 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 magnetic switch, a warning magnetic limit switch and a lower limit magnetic switch respectively;
the warning magnetic limit switch is arranged between the upper limit magnetic switch and the lower limit magnetic switch; the lower limit magnetic switch corresponds to the original point position;
the servo motor controller can respectively control the servo 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 magnetic switch, the servo motor to move at the first speed and a second rotating direction so as to enable the magnetic ring to move towards the warning magnetic limit switch, and the servo 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 magnetic 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 member further includes a limit block disposed between the electric cylinder and the venturi main body;
a first conduction part, a second conduction part and a third conduction 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 main body, and the third conduction part is communicated with the flow channel;
the first conducting part, the second conducting part and the third conducting part are in a step shape;
the adjusting part sequentially penetrates through the first conduction part, the second conduction part and the third conduction part and extends into the flow channel;
the second conduction part is matched with the fixing part, and the second conduction part can limit the fixing part.
In the above technical solution, further, the adjusting member includes a valve stem;
the valve rod is provided with the fixing part at the joint of the valve rod and the electric cylinder, and the part of the valve rod positioned in the flow passage is formed into the adjusting part;
protective layers are arranged on the outer side wall of the valve rod and the inner side wall of the flow passage;
the protective layer is made of polymer composite materials.
In the above technical solution, further, a first sealing member is provided between the adjusting portion and the third conduction portion.
In the above technical solution, further, an outlet pipe joint is provided at the outlet end, and a second sealing member is provided between the outlet pipe joint and an inner side wall of the housing of the venturi body.
In the above technical solution, a third sealing member is further provided between the outlet pipe joint and an end of the venturi tube housing.
Compared with the prior art, the beneficial effect of this application is:
the high-precision high-reliability quick-response adjustable venturi comprises a venturi main body, wherein the venturi main body is provided with an inlet end, an outlet end and a flow passage for communicating the inlet end with the outlet end, and the flow passage comprises a contraction section, a transition section and an expansion section which are connected in sequence; the electric control device also comprises an adjusting component, an electric cylinder and a control unit;
the adjusting component is provided with a fixing part and an adjusting part, the fixing part is connected with an output shaft of the electric cylinder, the adjusting part is of a conical structure, and the adjusting part is positioned in the flow channel and can form a critical flow channel with the transition section; the control unit is electrically connected with the electric cylinder;
the control unit controls the electric cylinder to enable the adjusting portion to move in the flow channel along the axis direction of the flow channel so as to change the cross-sectional area of the critical flow channel.
Specifically, the electric cylinder is a modularized product integrating a servo motor and a ball screw, can convert the rotary motion of the servo motor into linear motion, and can improve accurate adjustment of the position, state and orientation of an adjusting member by using the servo motor.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings used in the detailed description or the prior art description will be briefly described 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 structural diagram of a high-precision, high-reliability and fast-response adjustable venturi according to an embodiment of the present disclosure;
FIG. 2 is a cross-sectional view of an adjustable venturi with high accuracy, high reliability and fast response according to an embodiment of the present disclosure;
fig. 3 is a cross-sectional view of a high-precision, high-reliability and fast-response adjustable venturi according to the second embodiment of the present application;
fig. 4 is a top view of a high-precision, high-reliability and fast-response adjustable venturi according to the second embodiment of the present application;
fig. 5 is a cross-sectional view of a high-precision, high-reliability and fast-response adjustable venturi according to a third embodiment of the present application.
In the figure: 100-a venturi body; 101-an inlet end; 102-an outlet end; 103-a flow channel; 104-a constriction; 105-a transition section; 106-an expansion section; 107-a regulating member; 108-electric cylinder; 109-a fixed part; 110-an adjustment section; 111-critical flow path; 112-motor housing; 113-a groove; 114-ball screw; 115-a reduction member; 116-upper limit magnetic switch; 117-warning magnetic limit switch; 118-a lower limit magnetic switch; 119-a first direction of rotation; 120-a second rotational direction; 121-a limiting block; 122-a first conducting part; 123-a second conduction part; 124-a third conducting part; 125-a valve stem; 126-a first seal; 127-outlet pipe connection; 128-a second seal; 129-a third seal; 130-connecting piece.
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. 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.
Example one
With reference to fig. 1 and fig. 2, the present application provides a high-precision, high-reliability and fast-response adjustable venturi, which includes a venturi main body 100, the venturi main body 100 having an inlet end 101, an outlet end 102 and a flow passage 103 for communicating the inlet end 101 with the outlet end 102, the flow passage 103 including a contraction section 104, a transition section 105 and an expansion section 106 connected in sequence; also includes an adjusting member 107, an electric cylinder 108, and a control unit;
the adjusting component 107 is provided with a fixing part 109 and an adjusting part 110, the fixing part 109 is connected with an output shaft of the electric cylinder 108, the adjusting part 110 is in a conical structure, and the adjusting part 110 is located in the flow passage 103 and can form a critical flow passage 111 with the transition section 105; the control unit is electrically connected with the electric cylinder 108;
the control unit controls the electric cylinder 108 to move the adjusting part 110 in the flow passage 103 along the axial direction of the flow passage 103, so as to change the cross-sectional area of the critical flow passage 111.
Specifically, the electric cylinder 108 is a modular product in which a servo motor is integrated with the ball screw 114, and is capable of converting a rotational motion of the servo motor into a linear motion, thereby improving the accuracy of control of the adjustment member 107 by the servo motor.
More specifically, the electric cylinder 108 includes a servo motor, a motor housing 112, and a ball screw 114; an accommodating space is formed in the motor housing 112, the servo motor and the ball screw 114 are located in the accommodating space, the ball screw 114 is connected with an output shaft of the servo motor, and the fixing part 109 is sleeved on the ball screw 114; the servo motor is electrically connected with the control unit.
In the actual working process, the present application can adopt a bench servo control system to control the electric cylinder 108, so as to achieve accurate adjustment of the position, state and orientation of the adjusting member 107, wherein the bench servo control system is a prior art, and is briefly described as follows: the bench servo control system is mainly positioned by pulses, and when the servo motor receives 1 pulse, the bench servo control system rotates by an angle corresponding to 1 pulse, so that the displacement of the ball screw 114 is realized; furthermore, a closed-loop system can be realized between the pulses received by the servo motor and the pulses fed back by the servo motor, so that the rotation of the servo motor is accurately controlled, and the accurate adjustment of the adjusting component 107 is realized, wherein the adjusting precision can reach 0.0002mm and the highest precision can reach 0.0125mm under the common condition; meanwhile, the servo motor can also realize quick response, and the adjusting speed can reach 100 mm/s.
In this embodiment, the control unit includes a PLC controller, a servo motor controller electrically connected to the PLC controller, and a servo motor encoder; the servo motor controller is electrically connected with the servo motor, the receiving end of the servo motor encoder is electrically connected with the servo motor, and the transmitting end is electrically connected with the servo motor controller;
the PLC controller can transmit a preset instruction signal to the servo motor controller, and the servo motor controller which receives the preset instruction signal is used for controlling the servo motor to move so as to enable the adjusting component 107 to move along the axial direction of the flow channel 103;
the servo motor encoder is used for recording the running speed data and the rotating direction data of the output shaft of the servo motor and feeding back the running speed data and the rotating direction data to the servo motor controller.
In the actual working process, the PLC controller transmits a preset command signal to the servo motor controller, where the preset command signal is a pulse command, the servo motor controller drives the servo motor to rotate at a corresponding speed and direction after receiving the pulse command, and the rotational motion of the servo motor is converted into the linear motion of the adjustment mechanism through the transmission mechanism and the ball screw 114. 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 111 needs to be increased, the moving distance of the adjusting part 110 can be calculated through a relevant calculation formula of a venturi tube, and then the angle or the number of turns which need to be rotated by the servo motor is calculated through the transmission ratio of the transmission mechanism, the screw pitch of the ball screw 114 and the like; and finally, converting the pulse number of the servo motor driver into the pulse number required to be transmitted by the PLC through the conversion of an electronic gear ratio.
Step 200: the PLC controller sends a preset number of pulses, and the adjusting part 110 moves, so that the cross-sectional area of the critical flow passage 111 is adjusted, and the flowing flow of the liquid is adjusted; after the servo motor controller receives the pulse frequency and the pulse number of the PLC, the servo motor driver sends a certain pulse number at the corresponding pulse frequency, the servo motor receives the pulse frequency and the pulse number (wherein the pulse frequency corresponds to the rotating speed of the servo motor, and the pulse number corresponds to the rotating angle of the servo motor), the servo motor rotates at the corresponding angle at the speed corresponding to the pulse frequency, at the moment, the rotation of the servo motor is recorded by a servo motor encoder, and the encoder feeds back the recorded pulse to the servo motor driver; therefore, the servo motor driver corresponds to the pulse of the servo motor encoder, and the pulse of the servo motor encoder is matched with the pulse of the rotation angle of the servo motor, so that the closed-loop control is formed between the servo motor driver and the servo motor.
To sum up, the servo drive system who forms is closed loop control red copper, and the servo motor driver can directly sample servo 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.
Example two
The second embodiment is an improvement on the basis of the first embodiment, technical contents disclosed in the first embodiment are not described repeatedly, and contents disclosed in the second embodiment also belong to contents disclosed in the first embodiment.
In this embodiment, as shown in fig. 3 and 4, after the flow rate of the first liquid is regulated, the venturi needs to be reset to facilitate the next use, and to this end, the present application further includes a resetting member 115, where the resetting member 115 is electrically connected to the PLC controller;
the reset member 115 includes a magnetic ring and at least three magnetic limit switches arranged on the motor housing 112 at intervals, specifically, a slot 113 is formed on the motor housing 112, the magnetic limit switches are arranged in the slot 113, and the magnetic ring is arranged on the fixing portion 109;
in the actual use process, a vertical plane where a magnetic limit switch close to the venturi body 100 is located is defined as an origin position; when the fixing portion 109 moves along the axis direction, the magnetic ring triggers different magnetic limit switches to act, the PLC controller can receive an action signal of the magnetic limit switches, and transmits a preset instruction signal to the servo motor controller according to the action signal, so that the fixing portion 109 is reset to the original point position.
Specifically, for example, the number of the magnetic limit switches is three, and the three magnetic limit switches are an upper limit magnetic switch 116, a warning magnetic limit switch 117 and a lower limit magnetic switch 118; the warning magnetic limit switch 117 is disposed between the upper limit magnetic switch 116 and the lower limit magnetic switch 118; the lower limit magnetic switch 118 corresponds to the origin position.
Specifically, when the magnetic ring moves to the vicinity of the magnetic limit switch, the magnetic field intensity at the position is enhanced, and the magnetic limit switch is closed under the action of magnetism; 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.
More specifically, after the task is finished or a reset instruction is received, the adjusting portion 110 starts to move close to the upper limit magnetic switch 116 at a first speed (the first speed is a constant speed) and a first rotating direction 119 (the first rotating direction 119 is a clockwise rotating direction), after the magnetic ring touches the upper limit magnetic switch 116, the adjusting portion 110 stops moving and moves at a first speed and a second rotating direction 120 (the second rotating direction 120 is a counterclockwise rotating direction) until the magnetic ring touches the warning magnetic limit switch 117, and when the warning magnetic limit switch 117 is closed, the adjusting portion 110 moves close to the lower limit magnetic switch 118 at a second speed (the second speed is a constant speed, and the second speed is less than the first speed) until the lower limit magnetic switch 118 is touched, and the adjusting portion 110 stops moving, and at this time, the fixing portion 109 also reaches the original position.
In summary, in the first aspect, since the magnetic switch 118 is moved downwards at a constant low speed when the venturi tube is reset to the original position each time, the reset accuracy of the fixing portion 109 can be improved, thereby facilitating the flow control of the venturi tube; in the second aspect, whether the three magnetic limit switches work normally can be detected every time the fixed part 109 is reset to the original position, if the fixed part 109 moves to the corresponding position, the PLC controller does not receive a signal fed back by the magnetic limit switches, it indicates that the magnetic limit switches have problems, the fixed part 109 stops moving, and the PLC controller reports an error; in a third aspect, the upper limit magnetic switch 116 and the lower limit magnetic switch 118 can limit the displacement of the fixing portion 109, and in a normal working process, if the magnetic ring touches the upper limit magnetic switch 116 or the lower limit magnetic switch 118, the fixing portion 109 stops moving, so that the fixing portion 109 can only move within a certain range, a servo motor protection effect is achieved, and safety is improved.
In this embodiment, in order to prevent the fixed part 109 from hitting the venturi body 100 during the movement, the return member 115 further includes a stopper 121 disposed between the electric cylinder 108 and the venturi body 100; a first conduction part 122, a second conduction part 123 and a third conduction part 124 are sequentially arranged from the end part close to the electric cylinder 108 to the end part close to the venturi main body 100 in the limiting block 121, and the third conduction part 124 is communicated with the flow channel 103;
specifically, the limit block 121 is connected to the motor housing 112 by a connecting member 130.
The first conduction part 122, the second conduction part 123, and the third conduction part 124 are stepped; the adjusting part 110 sequentially passes through the first conduction part 122, the second conduction part 123 and the third conduction part 124 and extends into the flow channel 103; the second conduction part 123 is matched with the fixing part 109, and in the practical application process, when the fixing part 109 is completely abutted to the second conduction part 123, the fixing part 109 cannot move, so that the limiting effect on the fixing part 109 is realized, and the safety of the venturi tube is ensured.
EXAMPLE III
The third embodiment is an improvement on the third embodiment, technical contents disclosed in the third embodiment are not described repeatedly, and the contents disclosed in the third embodiment also belong to the contents disclosed in the third embodiment.
In this embodiment, as shown in connection with fig. 5, the adjustment member 107 includes a valve stem 125; the valve rod 125 is formed with the fixing portion 109 at a connection with the electric cylinder 108, and a portion of the valve rod 125 located in the flow passage 103 is formed as the adjusting portion 110; in order to improve the reliability of the present application, protective layers are disposed on the outer side wall of the valve rod 125 and the inner side wall of the flow channel 103; the protective layer is made of polymer composite materials.
Specifically, the polymer composite material is formed by compounding and combining a plurality of materials such as a polymer, ceramic powder, carbon fiber and the like. Preferably, the polymer composite material is KN22 polymer ceramic polymer material, which is prepared by grinding, fine filtering and blending polyurethane resin, modified epoxy resin, antirust paint, auxiliary agent and the like.
The following process is adopted when the polymer composite material is sprayed on the outer side wall of the valve rod 125 and the inner side wall of the flow channel 103: firstly, preparing a polymer composite material; then, grinding the outer side wall of the valve rod 125 and the inner side wall of the flow passage 103; and finally, air spraying and high-temperature curing.
Specifically, in order to enable the shielding layer to be better combined with the outer side wall to the valve rod 125 and the inner side wall of the flow passage 103, the outer side wall of the valve rod 125 and the inner side wall of the flow passage 103 are ground to Ra1.6.
Specifically, the polymer composite is uniformly blended according to a corresponding proportion, and sufficient stirring is required to ensure uniform mixing.
Specifically, air spraying is a spraying method that uses compressed air to atomize the coating, and it is necessary to adjust the spray shape (circular or fan shape) and spray width (fan shape) of the spray gun to ensure that the outer side wall of the valve stem 125 and the inner side wall of the flow channel 103 are uniformly coated and the coating is applied several times to ensure that the coating has a proper thickness.
Specifically, the high temperature curing means that the valve rod 125 and the venturi body 100 are placed in a high temperature container and heated and cured, and preferably heated at 80 degrees celsius for 2 hours or more.
In summary, in the first aspect, the special molecular structure of the polymer composite material endows the outer sidewall of the valve rod 125 and the inner sidewall of the flow channel 103 with high elasticity, so that the valve rod 125 and the flow channel 103 can adapt to temperature changes; in the second aspect, the polymer composite material has shock absorption and wear resistance, and can resist working conditions such as abrasion, erosion and the like in most environments; in a third aspect, the polymer composite material has excellent corrosion resistance, can resist corrosion of most low-temperature organic acids and inorganic acids, and can greatly prolong the service life of the valve rod 125 and the flow channel 103, and particularly, the high-density molecular weight and the smooth surface of the polymer composite material not only improve the cavitation resistance, but also improve the stability of fluid flow, so that the flow regulation is more controllable; in the fourth aspect, the valve stem 125 and the flow channel 103 with the protective layer can be compatible with more corrosive fluids during actual operation, for example, high and low concentrations of sulfuric acid can be compatible with them, thereby improving reliability.
In this embodiment, in order to prevent the liquid from leaking from the gap between the third conduction part 124 and the adjustment part 110, a first seal 126 is provided between the adjustment part 110 and the third conduction part 124.
In this embodiment, an outlet pipe connection 127 is provided at the outlet end 102, and in order to prevent liquid from leaking from a gap between the outlet pipe connection 127 and the housing of the venturi body 100, a second seal 128 is provided between the outlet pipe connection 127 and the inner side wall of the housing of the venturi body 100; a third seal 129 is provided between the outlet conduit fitting 127 and the end of the venturi housing.
Specifically, the third sealing element 129 is an aluminum pad, and the aluminum pad forms a pre-tightening force between the outlet pipe joint 127 and the housing of the venturi tube, and plays a role in fastening and stabilizing.
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. Moreover, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments.
Claims (7)
1. A high-precision high-reliability quick-response adjustable venturi comprises a venturi main body, wherein the venturi main body is provided with an inlet end, an outlet end and a flow passage for communicating the inlet end with the outlet end, and the flow passage comprises a contraction section, a transition section and an expansion section which are connected in sequence; the electric control device is characterized by further comprising an adjusting member, an electric cylinder and a control unit;
the adjusting component is provided with a fixing part and an adjusting part, the fixing part is connected with an output shaft of the electric cylinder, the adjusting part is of a conical structure, and the adjusting part is positioned in the flow channel and can form a critical flow channel with the transition section; the control unit is electrically connected with the electric cylinder;
the control unit controls the electric cylinder to enable the adjusting part to move in the flow channel along the axial direction of the flow channel so as to change the section area of the critical flow channel;
the electric cylinder comprises a servo motor, a motor shell and a ball screw;
the motor shell is internally provided with an accommodating space, the servo motor and the ball screw are positioned in the accommodating space, the ball screw is connected with an output shaft of the servo motor, and the fixing part is sleeved on the ball screw;
the servo motor is electrically connected with the control unit;
the control unit comprises a PLC controller, a servo motor controller and a servo motor encoder, wherein the servo motor controller is electrically connected with the PLC controller;
the servo motor controller is electrically connected with the servo motor, the receiving end of the servo motor encoder is electrically connected with the servo motor, and the transmitting end is electrically connected with the servo motor controller;
the PLC controller can transmit a preset instruction signal to the servo motor controller, and the servo motor controller which receives the preset instruction signal is used for controlling the servo motor to move so as to enable the adjusting component to move along the axial direction of the flow channel;
the servo motor encoder is used for recording the running speed data and the rotating direction data of the output shaft of the servo motor and feeding back the running speed data and the rotating direction data to the servo motor controller;
the adjustable venturi with high precision, high reliability and quick response further comprises a resetting component, and the resetting component is electrically connected with the PLC;
the reset component comprises a magnetic ring and at least three magnetic limit switches which are arranged on the motor shell at intervals, and the vertical plane where the magnetic limit switches close to the venturi tube main body are located is the original point position;
the magnetic ring is arranged on the fixing part;
when the fixing part moves along the axis direction, 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 motor controller according to the action signals, so that the fixing part is reset to the original point position.
2. A high-precision high-reliability quick-response adjustable venturi tube according to claim 1, wherein three magnetic limit switches are provided, wherein the three magnetic limit switches are an upper limit magnetic switch, a warning magnetic limit switch and a lower limit magnetic switch;
the warning magnetic limit switch is arranged between the upper limit magnetic switch and the lower limit magnetic switch; the lower limit magnetic switch corresponds to the original point position;
the servo motor controller can respectively control the servo 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 magnetic switch, the servo motor to move at the first speed and a second rotating direction so as to enable the magnetic ring to move towards the warning magnetic limit switch, and the servo 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 magnetic switch, and when the magnetic ring moves to the original point position, the fixing part is reset.
3. A high accuracy high reliability quick response adjustable venturi according to claim 1, wherein said reset member further comprises a stopper disposed between said electric cylinder and said venturi body;
a first conduction part, a second conduction part and a third conduction 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 main body, and the third conduction part is communicated with the flow channel;
the first conducting part, the second conducting part and the third conducting part are in a step shape;
the adjusting part sequentially penetrates through the first conduction part, the second conduction part and the third conduction part and extends into the flow channel;
the second conduction part is matched with the fixing part, and the second conduction part can limit the fixing part.
4. A high accuracy, high reliability and fast response adjustable venturi according to claim 1, wherein said adjusting member comprises a valve stem;
the valve rod is provided with the fixing part at the joint of the valve rod and the electric cylinder, and the part of the valve rod positioned in the flow passage is formed into the adjusting part;
protective layers are arranged on the outer side wall of the valve rod and the inner side wall of the flow passage;
the protective layer is made of polymer composite materials.
5. A highly accurate, reliable and fast responding adjustable venturi according to claim 3, wherein a first sealing member is provided between said adjusting portion and said third conducting portion.
6. A high accuracy, high reliability and fast response adjustable venturi according to claim 1, wherein an outlet pipe joint is provided at the outlet end, and a second sealing member is provided between the outlet pipe joint and the inner side wall of the housing of the venturi body.
7. A high accuracy high reliability fast response adjustable venturi according to claim 6, wherein a third seal is provided between said outlet conduit fitting and the end of the housing of said venturi.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110469344.7A CN113110627B (en) | 2021-04-28 | 2021-04-28 | High-precision, high-reliability and quick-response adjustable venturi |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110469344.7A CN113110627B (en) | 2021-04-28 | 2021-04-28 | High-precision, high-reliability and quick-response adjustable venturi |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113110627A CN113110627A (en) | 2021-07-13 |
| CN113110627B true CN113110627B (en) | 2022-05-17 |
Family
ID=76720313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110469344.7A Active CN113110627B (en) | 2021-04-28 | 2021-04-28 | High-precision, high-reliability and quick-response adjustable venturi |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113110627B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114166641B (en) * | 2021-12-06 | 2023-11-03 | 北京航空航天大学 | Venturi tube back pressure performance testing device and testing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101727108A (en) * | 2008-10-30 | 2010-06-09 | 北京航空航天大学 | Low-flow gas control device and using method thereof |
| CN102032598A (en) * | 2010-12-08 | 2011-04-27 | 北京航空航天大学 | Circumferentially graded low-pollution combustion chamber with multiple middle spiral-flow flame stabilizing stages |
| CN209325151U (en) * | 2019-01-10 | 2019-08-30 | 山东顺达空调设备有限公司 | Venturi valve and flow control system |
| CN209557121U (en) * | 2019-01-29 | 2019-10-29 | 山东普利达新能源科技有限公司 | A kind of jet dynamic control venturi mixer |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3524344A (en) * | 1968-09-19 | 1970-08-18 | Scans Associates Inc | Apparatus for testing carburetors |
| KR100202432B1 (en) * | 1991-03-15 | 1999-06-15 | 데이비드 팔머 | Process-chamber flow control system |
| US20060032930A1 (en) * | 2004-08-13 | 2006-02-16 | Banner Engineering & Sales, Inc. | Methods and apparatus for controlling baking oven zone temperature |
| CN101738227A (en) * | 2008-11-10 | 2010-06-16 | 北京航空航天大学 | Device and method for controlling and measuring flow of liquid nitrous oxide |
| CN101862035A (en) * | 2009-04-20 | 2010-10-20 | 扬州市天宝自动化工程有限公司 | Differential pressure air speed detection and control device |
| CN102620027B (en) * | 2011-01-26 | 2013-07-03 | 江西华电电力有限责任公司 | Electromagnetic spring type automatic rapid cut-off valve actuating mechanism |
| CN105888883B (en) * | 2016-05-09 | 2017-08-29 | 北京航空航天大学 | A kind of hydrogen peroxide precise control of flew magnetic valve |
| CN105757304A (en) * | 2016-05-09 | 2016-07-13 | 北京航空航天大学 | High-precision flow servo control valve |
| CN109704450B (en) * | 2019-03-05 | 2023-10-20 | 苏州方舟环保科技有限公司 | High-efficient waste water dissolves gas processing apparatus |
| CN110468426B (en) * | 2019-09-19 | 2020-06-30 | 哈尔滨共乐电力科技发展有限公司 | Pickling equipment of transformer silicon alloy steel |
-
2021
- 2021-04-28 CN CN202110469344.7A patent/CN113110627B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101727108A (en) * | 2008-10-30 | 2010-06-09 | 北京航空航天大学 | Low-flow gas control device and using method thereof |
| CN102032598A (en) * | 2010-12-08 | 2011-04-27 | 北京航空航天大学 | Circumferentially graded low-pollution combustion chamber with multiple middle spiral-flow flame stabilizing stages |
| CN209325151U (en) * | 2019-01-10 | 2019-08-30 | 山东顺达空调设备有限公司 | Venturi valve and flow control system |
| CN209557121U (en) * | 2019-01-29 | 2019-10-29 | 山东普利达新能源科技有限公司 | A kind of jet dynamic control venturi mixer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113110627A (en) | 2021-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113110627B (en) | High-precision, high-reliability and quick-response adjustable venturi | |
| CN202953172U (en) | Motor-driven steering engine | |
| CN106799331B (en) | Dispensing quantity metering control method | |
| US9927259B2 (en) | Rotary position indicator for actuator | |
| CA1220263A (en) | Apparatus for delivering accurate volume of liquid | |
| US5899437A (en) | Cam actuated valve | |
| CN102288264B (en) | Electric drive piston liquid micro flow measurement standard device | |
| CN111434862A (en) | Pressure monitoring control system for water supply pipe network | |
| CN108895180B (en) | Mechanical linkage system of valve | |
| CN109403605A (en) | A kind of house ornamentation robot based on uniaxial lifting device | |
| CN201688006U (en) | High precision electric control valve | |
| CN110836204A (en) | Servo valve and servo unit of integrated digital shaft controller | |
| US9393671B2 (en) | Programmable coolant nozzle system for grinding | |
| CN117167510B (en) | Regulating valve and flow regulating system | |
| CN101706267A (en) | Indexing mechanism with large diameter, small angle and high precision | |
| CN111322912A (en) | Thrust vector all-axis swinging spray pipe driven by ball screw in cooperation | |
| CN106958554A (en) | Direct feedback digital wobble hydraulic cylinder is driven in a kind of | |
| CN113019833B (en) | Double-component servo metering cylinder | |
| CN112032310B (en) | High-precision gas mass flow control valve | |
| CN109780296A (en) | A kind of linear motor valve positioner | |
| CN206169733U (en) | A lead screw device for digit control machine tool | |
| CN209977365U (en) | Venturi valve capable of accurately controlling air quantity | |
| CN113110626B (en) | Rectangular transparent adjustable venturi | |
| CN112872920A (en) | Robot magnetorheological polishing normal positioning actuator and method based on force feedback | |
| CN111891381A (en) | Aircraft front wheel deflection angle measuring mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |