Electric proportional valve with closed-loop control

Abstract

The utility model relates to the technical field of electric proportional valves, and discloses an electric proportional valve with closed-loop control, which comprises a stepping motor, the other end of the output shaft of the stepping motor is fixedly sleeved with a rotor, and the right end of the stepping motor is fixedly provided with an end cover. According to the utility model, through the arrangement of the stepping motor, the magnet, the magnetic encoder, the microcontroller and the coupling, when the stepping motor is started, the rotor drives the magnet to rotate, so that the magnetic encoder reads the position of the rotor through the magnetic pole change of the magnet and transmits the position to the microcontroller, and adjustment is carried out through the microcontroller; meanwhile, the threaded rod is sleeved with the rotor in a threaded mode and fixedly sleeved with the coupler, so that along with rotation of the rotor, the rotor pushes the threaded rod, linear motion is converted through the coupler, then the valve element is driven, a pulse width modulation coil can be replaced with the stepping motor, and the pulse width modulation coil can be adjusted through feedback of the magnetic encoder. And a closed-loop control system is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electric proportional valves, and more specifically, to an electric proportional valve with closed-loop control. Background Art

[0002] Electric proportional valve is a device used in the field of industrial automation production process control. Its control form is to control the opening angle of the valve to achieve control of the opening and cross-sectional area. It is used in petrochemical refining, pipeline crude oil transportation; power plant steam turbine unit cooling, lubricating oil supply, combustion air volume adjustment; liquid transportation cut-off, switch, flow regulation in environmental sewage treatment and other industrial automatic control processes.

[0003] Traditional electric proportional valves are mostly controlled by pulse width modulation coils. In actual use, due to structural and design limitations, corresponding amplifiers are required to control their proportional functions. At the same time, traditional electric proportional valves lack closed-loop control, which limits the accuracy of the electric proportional valves, making the control system of the electric proportional valves more complicated, larger in size, and higher in temperature, which is not conducive to cost savings for enterprises and increases the burden on enterprises. Therefore, improvements are needed. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides an electric proportional valve with closed-loop control, which has the advantages of closed-loop control.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an electric proportional valve with closed-loop control, comprising a stepper motor, the other end of the stepper motor output shaft is fixedly sleeved with a rotor, the right end of the stepper motor is fixedly installed with an end cover, the left end inside the end cover is fixedly installed with a PCB circuit board, the inner surface of the right end of the rotor is fixedly sleeved with a magnet, the left end of the PCB circuit board is fixedly installed with a magnetic encoder located on the right side of the magnet, a microcontroller is fixedly installed at the bottom of the right end of the PCB circuit board, the left end inside the rotor is threadedly sleeved with a threaded rod, the left end of the threaded rod is fixedly sleeved with a coupling, the inner surface of the left end of the coupling is movably sleeved with a valve core, the outer surface of the valve core is movably sleeved with an electric proportional valve body, the left end of the electric proportional valve body is threadedly sleeved with a screw plug, the right end of the electric proportional valve body and the left end of the protective shell are fixedly connected, and the magnet has completely opposite magnetic poles to ensure that the magnet can generate a magnetic field with varying intensity and direction.

[0006] As a preferred technical solution of the utility model, the outer surface of the coupling is movably sleeved with a protective shell, the right end of the protective shell is fixedly connected to the left end of the stepper motor, the inner bottom end of the coupling is movably sleeved with a screw, and the outer surface of the screw is threadedly sleeved with the inner surface of the bottom end of the protective shell.

[0007] As a preferred technical solution of the utility model, a base is fixedly installed on the top of the end cover, the left side of the bottom end of the base and the right side of the top end of the stepper motor are fixedly connected, and a plug is fixedly installed on the top of the base.

[0008] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0009] The utility model arranges a stepper motor, a magnet, a magnetic encoder, a microcontroller and a coupling. When the stepper motor is started, the rotor will drive the magnet to rotate, so that the magnetic encoder reads the position of the rotor through the change of the magnetic pole of the magnet, and then transmits it to the microcontroller and adjusts it through the microcontroller. At the same time, since the threaded rod is threadedly sleeved inside the rotor and the threaded rod and the coupling are fixedly sleeved, as the rotor rotates, the rotor will push the threaded rod, which is converted into linear motion through the coupling, and then drives the valve core. In this way, the pulse width modulation coil can be replaced by a stepper motor, so that a closed-loop control system is realized through the feedback of the magnetic encoder, and precise positioning is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model;

[0011] Figure 2 It is a structural schematic diagram of the bottom of the utility model;

[0012] Figure 3 It is a schematic diagram of the cross-sectional structure of the front side of the utility model;

[0013] Figure 4 for Figure 3 A schematic diagram of the local enlarged structure at point A in the middle;

[0014] Figure 5 for Figure 3 Schematic diagram of the local enlarged structure at point B in the middle.

[0015] In the figure: 1. stepper motor; 2. rotor; 3. end cover; 4. PCB circuit board; 5. magnet; 6. magnetic encoder; 7. microcontroller; 8. threaded rod; 9. coupling; 10. protective shell; 11. screw; 12. valve core; 13. electric proportional valve body; 14. screw plug; 15. base; 16. plug. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] like Figures 1 to 5 As shown, the utility model provides an electric proportional valve with closed-loop control, comprising a stepper motor 1, a rotor 2 is fixedly sleeved at the other end of the output shaft of the stepper motor 1, an end cover 3 is fixedly installed at the right end of the stepper motor 1, a PCB circuit board 4 is fixedly installed at the left end inside the end cover 3, a magnet 5 is fixedly sleeved on the inner surface of the right end of the rotor 2, a magnetic encoder 6 located on the right side of the magnet 5 is fixedly installed on the left end of the PCB circuit board 4, a microcontroller 7 is fixedly installed on the bottom of the right end of the PCB circuit board 4, a threaded rod 8 is threadedly sleeved at the left end inside the rotor 2, a coupling 9 is fixedly sleeved at the left end of the threaded rod 8, a valve core 12 is movably sleeved on the inner surface of the left end of the coupling 9, an electric proportional valve body 13 is movably sleeved on the outer surface of the valve core 12, a screw plug 14 is threadedly sleeved on the left end of the electric proportional valve body 13, the right end of the electric proportional valve body 13 is fixedly connected to the left end of the protective shell 10, and the magnet 5 has completely opposite magnetic poles to ensure that the magnet 5 can generate a magnetic field with varying intensity and direction.

[0018] When the stepper motor 1 is started, the rotor 2 will rotate. At this time, the magnet 5 fixedly sleeved on the right end of the rotor 2 will rotate together, so that the magnetic pole of the magnet 5 will change. At this time, the magnetic encoder 6 will read the position of the rotor 2 according to the change of the magnetic pole, and then transmit the position signal of the rotor 2 to the microcontroller 7, which will adjust it according to the rate of change of the position of the rotor 2. In this way, the precise control function can be achieved through the stepper motor 1, so that the pulse width modulation coil is replaced by the stepper motor 1. At the same time, a closed-loop control system is realized through the feedback of the magnetic encoder 6 to achieve precise positioning.

[0019] Among them, the outer surface of the coupling 9 is movably sleeved with a protective shell 10, the right end of the protective shell 10 is fixedly connected to the left end of the stepper motor 1, and the inner surface of the bottom end of the coupling 9 is movably sleeved with a screw 11, and the outer surface of the screw 11 is threadedly sleeved with the inner surface of the bottom end of the protective shell 10.

[0020] Due to the presence of the screw 11, the coupling 9 will be prevented from rotating along with the threaded rod 8, thereby achieving linear motion.

[0021] A base 15 is fixedly mounted on the top of the end cover 3 , the left side of the bottom of the base 15 is fixedly connected to the right side of the top of the stepper motor 1 , and a plug 16 is fixedly mounted on the top of the base 15 .

[0022] Due to the presence of the plug 16, a stable and reliable power supply will be provided.

[0023] The working principle and use process of this utility model:

[0024] First, the operator starts the stepper motor 1, so that the rotor 2 drives the magnet 5 to rotate. Since the magnetic poles of the magnet 5 are opposite, as the magnet 5 rotates, the magnetic encoder 6 will read the position of the rotor 2 by the change of the magnetic poles of the magnet 5, and then transmit the position information of the rotor 2 to the microcontroller 7, so that the microcontroller 7 can adjust the position by the rate of change of the rotor 2. At the same time, the threaded rod 8 threadedly sleeved inside the rotor 2 will be pushed as the rotor 2 rotates, thereby converting it into linear motion through the coupling 9, and finally driving the valve core 12 to move together. In this way, the stepper motor 1 can replace the pulse width modulation coil, and the closed-loop control system can be realized through the precise position feedback of the magnetic encoder 6. The system can achieve performance similar to that of a servo motor, thereby achieving better flow regulation and more outstanding linear regulation.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric proportional valve with closed-loop control, comprising a stepper motor (1), characterized in that: The other end of the output shaft of the stepper motor (1) is fixedly sleeved with a rotor (2); the right end of the stepper motor (1) is fixedly mounted with an end cover (3); the left end of the end cover (3) is fixedly mounted with a PCB circuit board (4); the inner surface of the right end of the rotor (2) is fixedly sleeved with a magnet (5); the left end of the PCB circuit board (4) is fixedly mounted with a magnetic encoder (6) located on the right side of the magnet (5); the bottom of the right end of the PCB circuit board (4) is fixedly mounted with a microcontroller (7); the left end of the rotor (2) is threadedly sleeved with a A threaded rod (8), the left end of the threaded rod (8) is fixedly sleeved with a coupling (9), the inner surface of the left end of the coupling (9) is movably sleeved with a valve core (12), the outer surface of the valve core (12) is movably sleeved with an electric proportional valve body (13), the left end of the electric proportional valve body (13) is threadedly sleeved with a screw plug (14), the right end of the electric proportional valve body (13) is fixedly connected to the left end of the protective shell (10), and the magnet (5) has completely opposite magnetic poles to ensure that the magnet (5) can generate a magnetic field with varying strength and direction.

2. The electric proportional valve with closed-loop control according to claim 1, characterized in that: The outer surface of the coupling (9) is movably sleeved with a protective shell (10), the right end of the protective shell (10) is fixedly connected to the left end of the stepper motor (1), and the bottom end of the coupling (9) is internally movably sleeved with a screw (11), and the outer surface of the screw (11) is threadedly sleeved with the inner surface of the bottom end of the protective shell (10).

3. The electric proportional valve with closed-loop control according to claim 1, characterized in that: A base (15) is fixedly mounted on the top of the end cover (3); the left side of the bottom of the base (15) is fixedly connected to the right side of the top of the stepper motor (1); and a plug (16) is fixedly mounted on the top of the base (15).

Images