Electrical conversion device based on electromagnetic induction and air pressure adjusting method of electrical conversion device

Abstract

The invention provides an electrical conversion device based on electromagnetic induction and an air pressure adjusting method of the electrical conversion device. The electrical conversion device based on electromagnetic induction comprises a shell, the shell is provided with an installation space, and an electromagnetic assembly is arranged in the shell; the nozzle is arranged in the mounting space in the axial direction of the shell, a back pressure cavity is formed between the nozzle and the mounting space, the nozzle is provided with an air inlet hole and an air outlet hole, an air channel is formed between the air inlet hole and the air outlet hole, the air channel is communicated with the back pressure cavity, and a magnetic valve element is arranged in the air channel; the control mechanism comprises a sensor and a controller, and the controller is electrically connected with the electromagnetic assembly. The backpressure cavity formed between the nozzle and the shell is communicated with the exhaust hole of the nozzle, and then the flow at the exhaust hole is adjusted by controlling the specific position of the magnetic valve element, so that the gas pressure of the backpressure cavity is indirectly controlled, the position of the magnetic valve element in the nozzle can be accurately and rapidly controlled, and the service life of the nozzle is prolonged. And the output airflow of the electrical conversion device is more stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical converter, in particular to an electrical conversion device based on electromagnetic induction and an electrical conversion device air pressure adjusting method. BACKGROUND

[0002] The valve positioner is the core component of the pneumatic control valve, and plays a very important role in the industrial process. Its main function is to process the input signal of the air source pressure and the valve position signal of the control valve, and control the opening of the control valve by adjusting the air source pressure of the input actuator. The electro-pneumatic conversion device is a conversion device in the controller that converts electrical signals into pneumatic signals, and is one of the most important components in the controller. At present, most domestic intelligent valve positioner manufacturers use piezoelectric valve structure, and its principle is to control the air source port through the deformation effect of the current-sensitive piezoelectric sheet caused by the current. However, the piezoelectric valve structure is prone to oscillation during long-term use, resulting in unstable output airflow. SUMMARY

[0003] The present application provides an electrical conversion device based on electromagnetic induction and an electrical conversion device air pressure adjusting method to solve the technical problem of unstable output airflow of the existing electrical conversion device.

[0004] The present application provides an electrical conversion device based on electromagnetic induction, which comprises: A housing having a mounting space, wherein an electromagnetic assembly is arranged in the housing; A nozzle arranged in the mounting space along the axial direction of the housing, wherein a back pressure cavity is arranged between the nozzle and the mounting space, the nozzle has an air inlet hole and an air outlet hole, a gas passage is arranged between the air inlet hole and the air outlet hole, the gas passage is in communication with the back pressure cavity, a magnetic valve core is arranged in the gas passage, and the electromagnetic assembly can drive the magnetic valve core to approach or move away from the air outlet hole; A control mechanism comprising a sensor and a controller, wherein the sensor is arranged in the gas passage and sleeved on the magnetic valve core, the controller is arranged outside the housing, the sensor is connected with the controller through the nozzle and the housing, and the controller is connected with the electromagnetic assembly.

[0005] In an embodiment of the present application, the magnetic valve core comprises a main body and a trapping portion, the main body and the trapping portion are integrally arranged, the trapping portion is located at one end of the main body close to the electromagnetic assembly, and at least part of the trapping portion can enter the air outlet hole.

[0006] In an embodiment of the present application, the diameter of the trapping portion gradually increases in the direction away from the exhaust hole, and the maximum diameter of the trapping portion is greater than the diameter of the exhaust hole.

[0007] In an embodiment of the present application, the trapping portion and the exhaust hole have a trapping gap, and the trapping gap has a linear relationship with the moving distance of the magnetic valve core.

[0008] In an embodiment of the present application, the trapping portion and the exhaust hole have a trapping gap, and the trapping gap has a non-linear relationship with the moving distance of the magnetic valve core.

[0009] In an embodiment of the present application, the nozzle is provided with a first forming plate and a second forming plate, both of which are disc-shaped structures, and the space between the first forming plate and the second forming plate forms the back pressure cavity.

[0010] In an embodiment of the present application, the nozzle and the shell are provided with a first sealing ring and a second sealing ring, which are respectively arranged on both sides of the back pressure cavity in the axial direction of the shell.

[0011] In an embodiment of the present application, the gas passage is provided with a limiting plate for limiting the movement of the magnetic valve core.

[0012] In an embodiment of the present application, the gas passage is provided with a throttling plate, and the throttling plate is provided with a throttling hole.

[0013] The present application also provides a gas pressure adjusting method for an electrical conversion device based on electromagnetic induction, which comprises the following steps: The nozzle is ventilated, and the gas enters the gas passage through the gas inlet hole. The gas is divided into two parts, one part enters the back pressure cavity, and the other part pushes the magnetic valve core to move and is discharged through the trapping gap; During the process that the gas pushes the magnetic valve core to move towards the exhaust port, part of the trapping portion enters the exhaust hole, and the trapping gap decreases; The sensor senses the moving distance of the magnetic valve core. When the magnetic valve core does not reach the preset position, the sensor transmits the moving distance of the magnetic valve core to the controller, and the controller starts the electromagnetic assembly; The electromagnetic assembly controls the magnetic valve core to move to the preset position, the trapping gap decreases, the gas pressure in the back pressure cavity increases, and the gas pressure in the back pressure cavity reaches the preset pressure.

[0014] The beneficial effects of the present application: the electrical conversion device and the electrical conversion device air pressure adjusting method based on electromagnetic induction are provided, the back pressure cavity formed between the nozzle and the shell is communicated with the exhaust hole of the nozzle, the flow rate at the exhaust hole is adjusted by controlling the specific position of the magnetic valve core, the control mechanism arranged simultaneously can freely control the specific position of the magnetic valve core through the electromagnetic assembly, so as to indirectly control the gas pressure of the back pressure cavity, so that the gas flow of the back pressure cavity can meet the air inlet requirement of the valve positioner, compared with the prior art, the position of the magnetic valve core in the nozzle can be accurately and quickly controlled, so that the output air flow of the electrical conversion device is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. It is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0016] In the drawings: Figure 1 The structural schematic diagram provided for an embodiment of the present application; Figure 2 The explosion diagram provided in an embodiment of the present application; Figure 3 The sectional view provided in an embodiment of the present application; Figure 4 The enlarged view of A provided in an embodiment of the present application; Figure 5 The schematic diagram when the displacement of the valve core and the gas flow are linear provided in an embodiment of the present application; Figure 6 The schematic diagram when the displacement of the valve core and the gas flow are nonlinear provided in an embodiment of the present application; Figure 7 The schematic diagram of the magnetic valve core when the displacement of the valve core and the gas flow are nonlinear provided in an embodiment of the present application; Figure 8 The method step diagram provided in an embodiment of the present application.

[0017] The reference signs are as follows: The shell 1, the nozzle 2, the air inlet hole 201, the exhaust hole 202, the air inlet channel 203, the first forming plate 204, the second forming plate 205, the magnetic valve core 3, the main body 301, the trapping part 302, the flow interception gap 303, the sensor 4, the back pressure cavity 5, the first sealing ring 6, the second sealing ring 7, the throttle plate 8, the throttle hole 801, the bearing 9, the electromagnetic assembly 10. DETAILED DESCRIPTION

[0018] The present application is described in greater detail by way of specific embodiments as follows. Other advantages and effects of the present application will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, according to which those skilled in the art will be able to effect the application. The present application can be implemented or applied in other different embodiments, and the details in the description can be modified or changed based on different views and applications without departing from the spirit of the present application. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0019] It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and the drawings only show the components related to the present application, not the number, shape and size of the components when actually implemented. The actual implementation of each component can be a random change, and the component layout pattern can be more complex.

[0020] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details, and in other embodiments, the known structures and devices are shown in the form of block diagrams rather than in the form of details to avoid making the embodiments of the present application difficult to understand.

[0021] Please refer to Figures 1-8 , an embodiment of the present application provides an electromagnetic induction-based electrical conversion device and an electrical conversion device air pressure adjustment method.

[0022] In an exemplary embodiment, the electromagnetic induction-based electrical conversion device includes a housing 1 having a mounting space, an electromagnetic assembly 10 arranged in the housing 1, and a nozzle 2 arranged in the housing 1. The housing 1 and the nozzle 2 are both tubular structures, the nozzle 2 is arranged in the mounting space along the axial direction of the housing 1, and a back pressure cavity 5 is formed between the nozzle 2 and the mounting space. The nozzle 2 has an air inlet hole 201 and an air outlet hole 202, a gas passage is arranged between the air inlet hole 201 and the air outlet hole 202, and the gas passage is in communication with the back pressure cavity 5. A magnetic valve core 3 is arranged in the gas passage, the electromagnetic assembly 10 can be used to drive the magnetic valve core 3 to move close to or away from the air outlet hole 202, and the electrical conversion device further includes a control mechanism including a sensor 4 and a controller (not shown in the figure). The sensor 4 is arranged in the gas passage and sheathed on the magnetic valve core 3, and is used to monitor the moving distance of the magnetic valve core 3 in real time to calculate the real-time position of the magnetic valve core 3. The controller is arranged outside the housing 1, the sensor 4 is arranged to pass through the nozzle 2 and electrically connected to the controller, and the controller is electrically connected to the electromagnetic assembly 10.

[0023] In the embodiment, the back pressure cavity 5 formed between the nozzle 2 and the shell 1 is communicated with the exhaust hole 202 of the nozzle 2, and the flow at the exhaust hole 202 is adjusted by controlling the specific position of the magnetic valve core 3. The control mechanism is freely controlled to control the specific position of the magnetic valve core 3 by the electromagnetic assembly 10, so as to indirectly control the gas pressure of the back pressure cavity 5, and the gas flow and the gas pressure of the back pressure cavity 5 can meet the air inlet requirement of the valve positioner. Compared with the prior art, the position of the magnetic valve core 3 in the nozzle 2 can be accurately and quickly controlled, and the output gas flow of the electrical conversion device is more stable.

[0024] For example, in the embodiment, the shell 1 and the nozzle 2 are both tubular, and the installation space is located in the shell 1 and penetrates through the whole shell 1. When the nozzle 2 is installed, the nozzle 2 is inserted from one end of the shell 1, so that the nozzle 2 is entirely located in the shell 1 and is clamped with the shell 1.

[0025] For example, in the embodiment, a connecting piece can be arranged between the nozzle 2 and the shell 1 to improve the fixing effect of the two. In a specific embodiment, a plurality of screws or pins can be arranged in the circumferential direction of the shell 1, and the connecting piece is arranged in the radial direction of the shell 1 to connect the shell 1 and the nozzle 2, so that the nozzle 2 can be positioned and prevented from rotating.

[0026] For example, in the embodiment, the sensor 4 is a Hall sensor 4. Since the magnetic valve core 3 is a permanent magnet, the Hall sensor 4 can accurately detect the moving distance of the magnetic valve core 3, so as to determine the position of the magnetic valve core 3 and determine whether the magnetic valve core 3 is moved to the position.

[0027] For example, a bearing 9 can be arranged in the air inlet channel 203 to provide stable support force for the magnetic valve core 3, so as to facilitate the axial movement of the magnetic valve core 3 in the gas channel.

[0028] It is worth noting that, in the embodiment, the electromagnetic assembly 10 is an electromagnetic coil installed in the shell 1, which provides electromagnetic force to drive the magnetic valve core 3 to move axially. Specifically, since the magnetic valve core 3 is a permanent magnet, when the electromagnetic coil is energized, the electromagnetic coil can drive the magnetic valve core 3 to move, and the moving distance of the magnetic valve core 3 can be controlled by controlling the energization time of the electromagnetic coil.

[0029] It is also worth noting that, in the embodiment, the electromagnetic assembly 10 can be installed in the shell 1 in various installation modes. Specifically, the electromagnetic assembly 10 can be connected with the shell 1 by flanges, screws, bolts and the like.

[0030] It should be noted that in the embodiment, a gap can exist between the electromagnetic assembly 10 and the housing 1, so that the gas discharged from the exhaust hole 202 can enter the atmosphere from the gap; or, a vent hole is formed on the housing 1, which is in communication with the mounting space, and the gas discharged from the exhaust hole 202 can be discharged into the atmosphere through the vent hole.

[0031] In an exemplary embodiment, the magnetic valve core 3 is cylindrical as a whole, which includes a main body 301 and a trapped portion 302, the main body 301 and the trapped portion 302 are integrally arranged, and the trapped portion 302 is located at one end of the main body 301 close to the electromagnetic assembly 10, so as to cooperate with the exhaust hole 202, wherein at least part of the trapped portion 302 can enter the exhaust hole 202.

[0032] In the embodiment, by arranging the trapped portion 302 and enabling the trapped portion 302 to enter the exhaust hole 202, the flow gap 303 formed between the trapped portion 302 and the exhaust hole 202 can be adjusted, and then the gas pressure of the back pressure cavity 5 can be adjusted.

[0033] As shown in Figure 3 and Figure 4 , the shape in the embodiment is specially designed, specifically, along the axial direction of the magnetic valve core 3 and in the direction away from the exhaust hole 202 of the magnetic valve core 3 (i.e. from right to left in the figure), the diameter of the trapped portion 302 gradually increases, and the maximum diameter of the trapped portion 302 is greater than the diameter of the exhaust hole 202. The more the part of the trapped portion 302 enters the exhaust hole 202, the smaller the flow gap 303 between the trapped portion 302 and the exhaust hole 202, and the less the gas discharged from the exhaust hole 202 per unit time, so that more gas enters the back pressure cavity 5 to meet the needs of the valve positioner, and when the end surface of the trapped portion 302 abuts against the exhaust hole 202, the pressure of the back pressure cavity 5 is the largest.

[0034] As shown in Figure 3 and Figure 5 , in the embodiment, the trapped portion 302 and the exhaust hole 202 have a flow gap 303, and the flow gap 303 has a linear relationship with the moving distance of the magnetic valve core 3. In another embodiment, as shown in Figure 6 and Figure 7 , the flow gap 303 has a non-linear relationship with the moving distance of the magnetic valve core 3. According to different needs, different shapes of the trapped portion 302 can be correspondingly arranged to meet the gas pressure adjustment efficiency of the back pressure cavity 5.

[0035] In an exemplary embodiment, the nozzle 2 is provided with a first forming plate 204 and a second forming plate 205, both of which are disc-shaped structures, and the space between the first forming plate 204 and the second forming plate 205 forms the back pressure cavity 5.

[0036] In the embodiment, the first forming plate 204 and the second forming plate 205 are arranged on the outer circumferential surface of the nozzle 2, so that the first forming plate 204 and the second forming plate 205 form the back pressure cavity 5, wherein the outer circumferential surface of the first forming plate 204 and the second forming plate 205 is attached to the inner wall of the shell 1.

[0037] In the embodiment, the first sealing ring 6 and the second sealing ring 7 are arranged between the nozzle 2 and the shell 1, and the first sealing ring 6 and the second sealing ring 7 are arranged on the left and right sides of the back pressure cavity 5 along the axial direction of the shell 1, so that the back pressure cavity 5 can be sealed to prevent gas leakage of the back pressure cavity 5. Meanwhile, a channel can be arranged on the shell, so that the back pressure cavity 5 is connected to the receiving part of the valve positioner to output the gas in the back pressure cavity 5.

[0038] In an exemplary embodiment, a limiting plate is arranged in the gas channel to limit the movement of the magnetic valve core 3.

[0039] In the embodiment, the limiting plate can cooperate with the head of the magnetic valve core 3 to limit the movement of the magnetic valve core 3, so as to prevent the magnetic valve core 3 from moving too much.

[0040] In an exemplary embodiment, a throttling plate 8 is arranged in the gas channel, and the throttling plate 8 is provided with a throttling hole 801.

[0041] In the embodiment, the head of the gas channel has a larger diameter, and the throttling plate 8 is arranged on the head, so that the rate of gas entering the gas channel can be improved through the throttling hole 801 of the throttling plate 8.

[0042] The application also provides a gas pressure adjusting method of an electrical conversion device, which is applied to the electrical conversion device based on electromagnetic induction and includes the following steps. S100: air is supplied to the nozzle 2, and the gas enters the gas channel through the air inlet hole 201, and the gas is branched, part of the gas enters the back pressure cavity 5, and the other part of the gas pushes the magnetic valve core 3 to move and is discharged through the interception gap 303; S200: in the process that the gas pushes the magnetic valve core 3 to move towards the exhaust port, part of the interception part 302 enters the exhaust hole 202, and the interception gap 303 is reduced; S300: the sensor 4 senses the movement distance of the magnetic valve core 3, and when the magnetic valve core 3 does not reach the preset position, the sensor 4 transmits the movement distance of the magnetic valve core 3 to the controller, and the controller starts the electromagnetic assembly 10; S400: the electromagnetic assembly 10 controls the magnetic valve core 3 to move to the preset position of the exhaust hole 202, the interception gap 303 is reduced, the gas pressure in the back pressure cavity 5 is increased, and the gas pressure in the back pressure cavity 5 reaches the preset gas pressure.

[0043] Specifically: the gas source enters the electrical converter, pushes the valve core displacement, the valve positioner receives the valve position change instruction, the gas enters the valve positioner through the back pressure cavity 5, the Hall sensor 4 monitors the magnetic valve core 3 position, specifically by monitoring the magnetic field of the magnetic valve core 3, if the valve core does not move to the position, the back pressure cavity 5 gas pressure is insufficient, the acquisition voltage signal feedback controller CPU, the controller CPU outputs the current signal to the electromagnetic component 10 through the PID algorithm, the electromagnetic component 10 generates a magnetic field through the electromagnetic effect, pushes the valve core displacement, and the controller CPU detects whether the valve position is correct in real time during the movement process, if the magnetic valve core 3 moves to the position, that is, the stable current signal does not change, so that the magnetic valve core 3 maintains the current position, after the work is completed, the electromagnetic component 10 is reversely electrified, the magnetic valve core 3 is pushed away from the exhaust hole 202, and the reset is realized.

[0044] Wherein, the direct relationship between the throttling area A between the valve core and the exhaust hole 202 and the flow Q can be obtained according to the following formula,

[0045] Wherein, wherein the flow coefficient is Y, the compressibility coefficient of the compressible gas is the gas density, and the pressure difference before and after is the pressure difference.

[0046] In summary, the back pressure cavity 5 formed between the nozzle 2 and the shell 1 is communicated with the exhaust hole 202 of the nozzle 2, and the specific position of the magnetic valve core 3 is controlled to adjust the flow at the exhaust hole 202, so as to indirectly control the gas pressure of the back pressure cavity 5, which can accurately and quickly control the position of the magnetic valve core 3 in the nozzle 2, and make the output gas flow of the electrical conversion device more stable.

[0047] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. An electromagnetic induction-based electrical conversion device, characterized by, The application relates to an electromagnetic induction-based electrical conversion device and a gas pressure adjusting method thereof. The device comprises a shell with a mounting space, an electromagnetic assembly arranged in the shell, and a vent hole arranged on the shell. A nozzle is arranged in the mounting space along the axial direction of the shell, and a back pressure cavity is arranged between the nozzle and the mounting space. The nozzle has an air inlet hole and an air outlet hole, and a gas passage is arranged between the air inlet hole and the air outlet hole.

2. The electromagnetic induction-based electrical conversion device of claim 1, wherein: The gas passage is communicated with the back pressure cavity, and a magnetic valve core is arranged in the gas passage.

3. The electromagnetic induction-based electrical conversion device of claim 2, wherein: The electromagnetic assembly can drive the magnetic valve core to move close to or away from the air outlet hole.

4. The electromagnetic induction-based electrical conversion device of claim 3, wherein: The vent hole is communicated with the air outlet hole.

5. The electromagnetic induction-based electrical conversion device of claim 3, wherein: A control mechanism comprises a sensor and a controller.

6. The electromagnetic induction-based electrical conversion device of claim 1, wherein: The sensor is arranged in the gas passage and sleeved on the magnetic valve core.

7. The electromagnetic induction-based electrical conversion device of claim 6, wherein: The controller is arranged outside the shell.

8. The electromagnetic induction-based electrical conversion device of claim 1, wherein: The sensor is connected with the controller through the nozzle and the shell.

9. The electromagnetic induction-based electrical conversion device of claim 1, wherein: The magnetic valve core comprises a main body and a trapping part. The main body and the trapping part are integrally arranged. The trapping part is arranged at one end of the main body close to the electromagnetic assembly. At least part of the trapping part can enter the air outlet hole. In the direction away from the air outlet hole, the diameter of the trapping part gradually increases. The maximum diameter of the trapping part is greater than the diameter of the air outlet hole. The trapping part and the air outlet hole have a flow interception gap. The flow interception gap has a linear relationship with the moving distance of the magnetic valve core. The flow interception gap has a non-linear relationship with the moving distance of the magnetic valve core. The nozzle is provided with a first forming plate and a second forming plate. The first forming plate and the second forming plate are both disc-shaped structures. The space between the first forming plate and the second forming plate forms the back pressure cavity. The nozzle and the shell are provided with a first sealing ring and a second sealing ring. The first sealing ring and the second sealing ring are arranged on the two sides of the back pressure cavity along the axial direction of the shell. The gas passage is provided with a limiting plate for limiting the magnetic valve core. The gas passage is provided with a throttle plate. The throttle plate is provided with a throttle hole. The application discloses an electromagnetic induction-based electrical conversion device and a gas pressure adjusting method thereof. The gas is introduced into the nozzle, enters the gas passage through the air inlet hole, is divided into two parts, one part enters the back pressure cavity, and the other part pushes the magnetic valve core to move and is discharged through the flow interception gap. In the process that the gas pushes the magnetic valve core to move to the air outlet, part of the trapping part enters the air outlet hole, and the flow interception gap is reduced. The sensor senses the moving distance of the magnetic valve core. When the magnetic valve core does not reach the preset position, the sensor transmits the moving distance of the magnetic valve core to the controller. The controller starts the electromagnetic assembly. The electromagnetic assembly controls the magnetic valve core to move to the preset position of the air outlet hole. The flow interception gap is reduced, the gas pressure in the back pressure cavity is increased, and the gas pressure in the back pressure cavity reaches the preset gas pressure.

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