CN118659608A - A permanent magnet moving iron torque motor for valve positioner - Google Patents
A permanent magnet moving iron torque motor for valve positioner Download PDFInfo
- Publication number
- CN118659608A CN118659608A CN202410759536.5A CN202410759536A CN118659608A CN 118659608 A CN118659608 A CN 118659608A CN 202410759536 A CN202410759536 A CN 202410759536A CN 118659608 A CN118659608 A CN 118659608A
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- Prior art keywords
- permanent magnet
- magnetic connecting
- armature
- magnetic
- connecting column
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K26/00—Machines adapted to function as torque motors, i.e. to exert a torque when stalled
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention relates to the field of fluid transmission control, in particular to a permanent magnet moving iron type torque motor for a valve positioner, which comprises the following components: the coil component and the magnetic connecting column can form two magnetic columns with different polarities when the coil component is electrified; the permanent magnet is positioned between the magnetic connecting column and the magnetic connecting block through surface contact attraction according to different polarities; the magnetic connecting block is attracted with the permanent magnet through surface contact and magnetized by the permanent magnet; the armature baffle surface is arranged towards the magnetic connecting column, the permanent magnet and the magnetic connecting block, and a certain gap is reserved between the armature baffle surface and the magnetic connecting column, the permanent magnet and the magnetic connecting block; the middle of the elastic piece is connected with the armature baffle plate through a pin, and the armature baffle plate can deflect around the center of the elastic piece; the nozzle is mounted at a position corresponding to the armature plate and is connected to an air source for injecting air toward the armature plate. The invention has the advantages of less air gap, high efficiency, greatly reduced processing and assembling difficulty, good linearity and more accurate valve position adjustment.
Description
Technical Field
The invention relates to the field of fluid transmission control, in particular to a permanent magnet moving iron type torque motor for a valve positioner.
Background
In modern industrial process control systems, valve positioners are critical components for achieving precise fluid control. The parameters such as medium flow, pressure, temperature and the like are ensured to meet the process control requirements by adjusting the opening of the valve. Valve positioners rely on pneumatic or electric actuators to actuate valves, but these systems often suffer from inefficiency, slow response, inaccurate positioning, and the like.
In the air pressure control device, a technique is commonly used in which a minute current signal is used to control the deflection of the shutter to generate displacement, thereby affecting the nozzle shutter pitch and converting the nozzle shutter pitch into an air pressure signal. The torque motor is often applied to the device, and the permanent magnet moving iron type torque motor has the characteristics of small volume, light weight, high energy efficiency, high response speed and the like. The motor generates a stable magnetic field by using permanent magnetic materials, and generates rotary or linear motion by electromagnetic action, thereby driving the valve to a preset position. Its precise control capability and rapid responsiveness make permanent magnet moving iron type torque motors an ideal choice for improving valve positioning performance.
Along with the improvement of environmental protection requirements and the increase of energy cost, high-efficiency energy conservation becomes another important index for valve positioner design. The permanent magnet moving iron type torque motor has obvious advantages in this respect, can provide required power and speed at lower energy consumption, is beneficial to reducing the energy consumption of the whole control system, and has important significance for promoting the green low-carbon industrial development.
In the aspect of the design of a permanent magnet moving iron type torque motor, the important point is how to design a proper magnetic circuit structure to improve the efficiency and torque density of the motor, and to realize the accurate control of the motor motion so as to meet the high-precision positioning requirement. By fine design of the magnetic circuit structure and selection of high-quality permanent magnet materials, the loss of magnetic flux can be effectively reduced, and therefore torque output and efficiency of the motor are improved. At the same time, the proportional conversion from the electric signal to the air pressure signal is realized structurally by the cooperation of the permanent magnet and the electromagnetism and the cooperation of the related elastic structures
High precision positioning requirements. And the high-precision sensor and control algorithm realize real-time monitoring and accurate control of the motor state, and ensure the rapid and accurate positioning of the valve.
Although permanent magnet moving iron torque motors exhibit great potential for application, some challenges remain in practical use. For example, how to design a suitable magnetic circuit structure to improve the efficiency and torque density of the motor, how to realize accurate control of the torque motion to meet high-precision positioning requirements, how to ensure the reliability and life of the motor in a severe industrial environment, how to design an optimized structure to reduce machining and assembly difficulties, and the like. The solution of these problems requires intensive research and innovation in the aspects of permanent magnet material selection, electromagnetic design, control strategy, structural optimization and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a permanent magnet moving iron type torque motor for a valve positioner, which can utilize two magnetic poles generated by corresponding control electric signals in the valve positioner to be overlapped with a permanent magnet magnetizing field arranged around at an air gap, so that an armature baffle deflects to change the distance between an armature and a nozzle, further adjust the air pressure in proportion, has higher efficiency and can obviously improve the performance of the valve positioner.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides a permanent magnetism moves indisputable moment motor for valve locator, includes coil assembly, magnetism spliced pole, permanent magnet, magnetism connecting block, elastic sheet, armature baffle, nozzle, first casing and second casing, permanent magnet, magnetism spliced pole, magnetism connecting block all have two, the symmetry is arranged in first casing both sides, and the polarity of two permanent magnets is placed the opposite direction, coil assembly pass through holding screw and link to each other with the bottom of two magnetism spliced poles, when the coil assembly circular telegram, can magnetize two magnetism spliced poles into different polarities; the permanent magnet is in the middle position of the magnetic connecting column and the magnetic connecting block through surface contact attraction according to different polarities; the magnetic connecting block is attracted with the permanent magnet through surface contact and magnetized by the permanent magnet; the armature baffle is arranged facing the magnetic connecting column, the permanent magnet and the magnetic connecting block, and a certain gap is reserved between the armature baffle and the magnetic connecting column, the permanent magnet and the magnetic connecting block; the elastic sheet is horizontally arranged in the first shell through a screw and is used for providing torsion force when the armature baffle plate is subjected to magnetic force movement, the middle of the elastic sheet is connected with the armature baffle plate through a pin, and the armature baffle plate can deflect around the center of the elastic sheet; the nozzle is arranged on the second shell and is positioned at a corresponding position of the armature baffle plate, and the nozzle is connected with an air source and is used for spraying air to the armature baffle plate.
Further, the two side surfaces of the permanent magnet are respectively contacted and attracted with the corresponding magnetic connecting block and the corresponding magnetic connecting cylindrical surface.
Further, one end of the magnetic connecting column is connected with the coil assembly through a set screw, and meanwhile, the magnetic connecting column is connected with the first shell through interference fit, and the other end of the magnetic connecting column is arranged in the first shell.
Further, the second casing pass through No. two holding screw and link to each other with first casing, install the spacing nail on it, the spacing nail runs through the setting of second casing, has a certain distance from the armature baffle for the displacement by a wide margin of restriction armature baffle.
Further, the nozzle link to each other with the second casing through the screw thread, the nozzle passes through interference fit with the cap soon and is connected, the lower extreme of nozzle runs through the setting of second casing, but through cap soon adjustable nozzle and armature baffle between the distance.
Further, through holes matched with pins are formed in the armature baffle plate, and the pins are symmetrically installed.
Further, the middle of the elastic sheet is riveted with the armature baffle through two symmetrically installed pins, and the electromagnetic moment born by the armature baffle is balanced with the elastic force of the elastic sheet.
Further, the magnetic connecting column, the magnetic connecting block and the armature baffle are all made of soft magnetic materials, the first shell and the second shell are made of aluminum alloy without affecting the magnetic circuit, and the elastic sheet is made of high-hardness high-elasticity 304 spring steel.
The invention has the following characteristics and beneficial effects:
the permanent magnet moving iron type moment motor for the valve positioner can utilize two magnetic poles generated by corresponding control electric signals in the valve positioner to be overlapped with a permanent magnet magnetizing field arranged around the valve positioner at an air gap, so that an armature baffle deflects to change the distance between an armature and a nozzle, and further the air pressure is regulated in proportion, namely the motor can regulate the air pressure of an air chamber of a pneumatic actuator in proportion according to control signals of a control unit.
The permanent magnet moving iron type torque motor for the valve positioner is provided with a proper magnetic circuit structure, the number of gaps is smaller, the efficiency of the torque motor is higher, the performance of the valve positioner can be obviously improved, and the valve positioner has important engineering application value and market potential.
The permanent magnet moving iron type torque motor for the valve positioner is simpler and more convenient to process and assemble, is beneficial to improving the precision and efficiency of industrial process control, and provides support for promoting the development of industrial automation technology.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic system diagram of a valve positioner.
Fig. 2 is an oblique view of a permanent magnet moving iron type torque motor device for a valve positioner according to an embodiment of the present invention.
Fig. 3 is an exploded view of a permanent magnet moving iron type torque motor device for a valve positioner according to an embodiment of the present invention.
Fig. 4 is a cross-sectional view of a permanent magnet moving iron type torque motor apparatus for a valve positioner according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of the first housing in the embodiment of the present invention.
Fig. 6 is a state diagram of armature deflection in an embodiment of the invention.
Fig. 7 is a schematic diagram of a magnetic circuit of an embodiment of the present invention.
Fig. 8 is a main structural outline of the embodiment of the present invention.
Fig. 9 is a schematic structural view of an elastic sheet in the embodiment of the present invention.
Fig. 10 is a schematic structural view of a magnetic connection post in an embodiment of the present invention.
Reference numerals illustrate:
1: a coil assembly; 2: a plastic sleeve; 3: a first set screw; 4: an iron core; 5: a first magnetic connecting column; 6: a first housing; 7: a first magnetic connecting block; 8: a first permanent magnet; 9: an armature baffle; 10: a second housing; 11: a cap is screwed; 12: a nozzle; 13: a pin; 14: an elastic sheet; 15: a screw; 16: a limit screw; 17: a second set screw; 18: a second magnetic connecting block; 19: a second permanent magnet; 20: and a second magnetic connecting column.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
As shown in fig. 2-4, the permanent magnet moving iron type torque motor device for the valve positioner of the present invention comprises a coil assembly 1, a magnetic connecting column, a permanent magnet, a magnetic connecting block, an elastic sheet 14, an armature baffle 9, a nozzle 12, a first shell 6 and a second shell 10, wherein the two permanent magnets, the magnetic connecting column and the magnetic connecting block are respectively a first permanent magnet 8 and a second permanent magnet 19, a first magnetic connecting column 5 and a second magnetic connecting column 20, a first magnetic connecting block 7 and a second magnetic connecting block 18, and are symmetrically arranged at two sides in the first shell; the lower end surfaces of the first magnetic connecting column 5 and the second magnetic connecting column 20 are respectively connected with the coil assembly 1 through the first set screw 3, and when the coil assembly 1 is electrified, the first magnetic connecting column 5 and the second magnetic connecting column 20 can be magnetized into different polarities; the polarities of the first permanent magnet 8 and the second permanent magnet 19 are opposite, the two side surfaces of the first permanent magnet 8 are respectively in surface contact attraction with the first magnetic connecting column 5 and the first magnetic connecting block 7, and the second permanent magnet 19 is respectively in surface contact attraction with the second magnetic connecting block 18 and the second magnetic connecting column 20. As shown in fig. 4 and 8, the armature damper 9 is mounted on the elastic sheet 14 by riveting through the pin 13, and the armature damper 9 is arranged facing the magnetic connecting column, the permanent magnet and the magnetic connecting block and is kept with a certain gap with the magnetic connecting column, the permanent magnet and the magnetic connecting block; the elastic sheet 14 is arranged in the first shell 6, both ends of the elastic sheet are arranged on the first shell through screws 15 and used for providing torsion force when the armature baffle moves under magnetic force, the middle of the elastic sheet is connected with the armature baffle through a pin, and the armature baffle can deflect around the center of the elastic sheet; the nozzle 12 is mounted on the second housing 10 by threads, is connected with the screw cap by interference fit, is connected with an air source, and is used for injecting air to the armature damper; the nozzle 12 is positioned at the corresponding position of the armature baffle, the lower end of the nozzle penetrates through the second shell, and the distance between the nozzle and the armature baffle can be adjusted through the screw cap; as shown in fig. 2, the second housing 10 is connected to the first housing 6 by a second set screw 17, on which a limiting nail 16 is mounted, the limiting nail 16 penetrating the second housing 10 and being disposed at a distance from the armature plate for limiting the substantial displacement of the armature plate.
As shown in fig. 1, in the regulating valve, the permanent magnet moving iron type torque motor device of the invention is communicated with a pipeline connected with a gas source and a pneumatic actuating mechanism. The control unit sends out an electric signal to the torque motor, and the distance between the nozzle of the torque motor and the armature baffle is changed, so that the air pressure input into the air chamber of the pneumatic actuating mechanism is changed in proportion, and the actuating mechanism pushes the valve rod to accurately control the regulating valve.
In this embodiment, the armature baffle 9 is provided with a through hole adapted to the pin 13, the pins are symmetrically installed, the middle of the elastic sheet and the armature baffle are riveted by two symmetrically installed pins, and an elastic force for supporting the armature baffle to twist is generated at the position where the width of the connecting part between the middle and two ends of the elastic sheet is smaller.
In this embodiment, the first magnetic connecting post 5, the second magnetic connecting post 20, the first magnetic connecting block 7, the second magnetic connecting block 18 and the armature damper 9 are all made of soft magnetic alloy, so that they have good magnetic permeability. The first permanent magnet 8 and the second permanent magnet 19 are samarium cobalt magnets, and the coil assembly is copper coils. The first and second housings are made of aluminum alloy to isolate the external magnetic field and the interference of the coil assembly 1 to the magnetic circuit in the first housing 6. The elastic sheet is made of high-hardness high-elasticity 304 spring steel.
In the invention, when the coil assembly 1 is not electrified, the permanent magnets at the two ends form fixed magnetic fields with the magnetic connecting column, the magnetic connecting block and the armature baffle respectively, the magnetic attraction force born by the two ends of the armature baffle is equal, and the armature baffle is at the middle position.
When a certain small current is conducted to the coil assembly 1, one end of the magnetic connecting column at two magnetized ends is N pole, the other end is S pole, an electromagnetic field generated by the conduction is superposed with a fixed magnetic field generated by the permanent magnet, the magnetic field force received by one end of the armature baffle plate 9 is larger than that received by the other end, at the moment, the armature baffle plate 9 is twisted and balanced with the elastic force of the elastic piece as shown in fig. 6, and the distance between the armature baffle plate 9 and the nozzle 12 is changed, so that the air pressure in the air path is changed. When different amounts of current are supplied to the coil assembly 1, the angle by which the armature plate 9 is twisted is different, so that changing the current changes the distance of the armature plate 9 from the nozzle 12 in proportion to the change of the current. As shown in fig. 7, the two permanent magnet poles in the first housing 6 need to be placed in different directions, and changing the positive and negative poles of the current or changing the direction of the polarity of the permanent magnet will cause the armature damper to have different torsion directions.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A permanent magnet moving iron type torque motor for a valve positioner, characterized in that: including coil assembly, magnetism spliced pole, permanent magnet, magnetism connecting block, elastic sheet, armature baffle, nozzle, first casing and second casing, wherein:
the coil component can magnetize the two magnetic connecting columns to different polarities when being electrified;
The magnetic connecting column is a magnetic column which can form two different polarities when the coil assembly is electrified;
The permanent magnet is in the middle position of the magnetic connecting column and the magnetic connecting block through surface contact attraction according to different polarities;
The magnetic connecting block is attracted with the permanent magnet through surface contact and magnetized by the permanent magnet;
the armature baffle is arranged facing the magnetic connecting column, the permanent magnet and the magnetic connecting block, and a certain gap is reserved between the armature baffle and the magnetic connecting column, the permanent magnet and the magnetic connecting block;
the elastic sheet is used for providing torsion force when the armature baffle plate is subjected to magnetic force movement, the middle of the elastic sheet is connected with the armature baffle plate through a pin, and the armature baffle plate can deflect around the center of the elastic sheet;
The nozzle is arranged on the second shell and is positioned at a corresponding position of the armature baffle plate, and the nozzle is connected with an air source and is used for spraying air to the armature baffle plate.
2. A permanent magnet moving iron type torque motor for a valve positioner according to claim 1, wherein: the permanent magnet, the magnetic connecting column and the magnetic connecting block are symmetrically arranged at two sides in the first shell, the polarities of the two permanent magnets are opposite in placement direction, and the two side surfaces are respectively contacted and attracted with the corresponding magnetic connecting block and the corresponding magnetic connecting column surface.
3. A permanent magnet moving iron type torque motor for a valve positioner according to claim 1, wherein: one end of the magnetic connecting column is connected with the coil assembly through a set screw, and meanwhile, the magnetic connecting column is connected with the first shell through interference fit, and the other end of the magnetic connecting column is arranged in the first shell.
4. A permanent magnet moving iron type torque motor for a valve positioner according to claim 1, wherein: the second shell is connected with the first shell through a second set screw, and a limit nail is arranged on the second shell and penetrates through the second shell, and is a certain distance away from the armature baffle plate and used for limiting the large-amplitude displacement of the armature baffle plate.
5. A permanent magnet moving iron type torque motor for a valve positioner according to claim 1, wherein: the nozzle is connected with the second shell through threads, the nozzle is connected with the screw cap through interference fit, the lower end of the nozzle penetrates through the second shell, and the distance between the nozzle and the armature baffle can be adjusted through the screw cap.
6. A permanent magnet moving iron type torque motor for a valve positioner according to claim 1, wherein: the armature baffle plate is provided with through holes matched with the pins, and the pins are symmetrically arranged.
7. A permanent magnet moving iron type torque motor for a valve positioner according to claim 1, wherein: the middle of the elastic sheet is riveted with the armature baffle through two symmetrically installed pins, and the electromagnetic moment born by the armature baffle is balanced with the elastic force of the elastic sheet.
8. A permanent magnet moving iron type torque motor for a valve positioner according to claim 1, wherein: the magnetic connecting column, the magnetic connecting block and the armature baffle are all made of soft magnetic materials, the first shell and the second shell are made of aluminum alloy, and the elastic sheet is made of high-hardness high-elasticity 304 spring steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410759536.5A CN118659608A (en) | 2024-06-13 | 2024-06-13 | A permanent magnet moving iron torque motor for valve positioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410759536.5A CN118659608A (en) | 2024-06-13 | 2024-06-13 | A permanent magnet moving iron torque motor for valve positioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118659608A true CN118659608A (en) | 2024-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410759536.5A Pending CN118659608A (en) | 2024-06-13 | 2024-06-13 | A permanent magnet moving iron torque motor for valve positioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118659608A (en) |
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2024
- 2024-06-13 CN CN202410759536.5A patent/CN118659608A/en active Pending
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