Driving and control integrated variable-frequency direct-current electromagnetic valve, control circuit and control method thereof

Abstract

The invention relates to a drive-control integrated variable-frequency direct-current electromagnetic valve, a control circuit and a control method thereof. A drive and control integrated variable frequency direct current electromagnetic valve is composed of a valve element arranged in a valve body, a coil arranged on the valve element in a sleeving mode, an air inlet, an air outlet, a drive and control board arranged on the inner wall of the valve body, an LED display window and keys, wherein the air inlet and the air outlet are formed in the symmetrical ends of the valve element along the valve body, and the LED display window is electrically connected with the drive and control board, exposed out of the valve body and used for displaying the current set frequency. A variable-frequency PWM square wave signal is generated through a drive control board control circuit; and the PWM square wave signal is loaded to the coil to generate a magnetic field so as to drive the valve core to move.

Description

Technical Field

[0001] The invention belongs to the technical field of sandblasting and shot blasting, and particularly relates to a drive-control integrated variable frequency DC solenoid valve, a control circuit and a control method thereof. Background Art

[0002] At present, the mainstream solenoid valves in the market have, on the one hand, non-adjustable frequencies or very low frequency bandwidths. On the other hand, as the frequency increases, the corresponding solenoid valve air flow path will decrease, and the corresponding air flow rate will decrease, affecting the sandblasting and shot peening effects. On the other hand, the mainstream solenoid valves in the market require additional drives, which increases the cost of use and is inconvenient to operate.

[0003] CN201510276479.6 discloses a direct-acting axial flow solenoid valve, which aims to solve the problems existing in the prior art. The present invention provides a direct-acting axial flow solenoid valve, which has a small electromagnetic force when starting, can be opened reliably under large flow conditions, and has a small flow resistance loss. The technical solution: The direct-acting axial flow solenoid valve of the present invention includes an inlet nozzle 1, a valve core gasket 2, a gland 3, a valve core 4, a coil skeleton 5, a housing 6, a movable armature 7, a stationary yoke 8 and a spring 9, such as Figure 1 As shown. The fluid is introduced from the inlet nozzle 1, and enters the interior of the gland 3 through the liquid inlet channel on the inlet nozzle 1. When the coil is not energized, the front end of the valve core 4 is pressed against the valve core gasket 2 under the elastic force of the spring. At this time, the fluid inside the gland 3 cannot enter the valve core 4, and the solenoid valve is in a closed state. After the coil is energized, under the action of the coil magnetic field, the movable armature 7 is attracted by the stationary yoke 8, overcomes the spring force, and drives the valve core 4 to move backward together. At this time, the front end of the valve core 4 is separated from the valve core gasket 2, and the solenoid valve passage is opened. The fluid enters the valve core 4 from the front end of the valve core 4 through the liquid inlet channel 11, and then enters the interior of the stationary yoke 8, and finally flows out from the rear end of the stationary yoke 8. After power is cut off, the magnetic force disappears, and the spring force of the spring causes the movable armature 7 to return to the initial position. At this time, the front end of the valve core 4 is pressed against the valve core gasket 2 again, cutting off the fluid supply. Its shortcomings are:

[0004] ⑴ It does not have control function itself and needs to provide additional drive control circuit;

[0005] ⑵The frequency is not adjustable or the adjustment range is small;

[0006] ⑶ The frequency cannot be displayed in real time. Summary of the invention

[0007] The purpose of the present invention is to provide a drive + control + execution integrated into one, which can achieve frequency conversion directly through setting, without the need for additional external control, and simple external wiring; a drive-control integrated variable frequency DC solenoid valve, a control circuit and a control method thereof with an adjustable frequency range of 1 to 00 Hz.

[0008] The technical solution of the present invention is the drive-control integrated variable frequency DC solenoid valve, which is special in that it consists of a valve core arranged in the valve body, a coil mounted on the valve core, an air inlet and an air outlet respectively arranged along the symmetrical ends of the valve body of the valve core, a drive-control board arranged on the inner wall of the valve body, and an LED display window and a button electrically connected to the drive-control board and exposed outside the valve body for displaying the currently set frequency; a variable frequency PWM square wave signal is generated through the drive-control board control circuit; the PWM square wave signal is loaded into the coil to generate a magnetic field, thereby driving the valve core to move.

[0009] Preferably, the air inlet and the air outlet are axially arranged at two symmetrical ends of the valve body along the same axis of the valve core.

[0010] As a preferred embodiment: when the PWM square wave signal is at the peak, that is, the power-on state, a magnetic field is generated, pushing the valve core toward the air inlet side, closing the air path; when the PWM square wave signal is at the trough, that is, the power-off state, the magnetic field disappears, and the air pressure pushes the valve core toward the air outlet side, opening the air path, thereby achieving the opening and closing of the air path.

[0011] Preferably, the drive-control integrated variable frequency solenoid valve is installed by means of an L-shaped mounting bracket that penetrates axially along the valve wall.

[0012] Preferably, the air inlet and the air outlet are radially arranged on the valve body along the axis of the valve core.

[0013] Preferably: the control circuit includes an isolation circuit electrically connected through an input interface to access the MCU, the MCU is electrically connected to the solenoid valve through an isolation drive amplifier circuit, the MCU is electrically connected to the LED display through a display drive circuit, and an external power supply supplies power to the MCU through a DC-DC power supply circuit; a button is connected to the MCU; PWM output is achieved through the MCU, and high and low level reversal is achieved by adjusting the count number, thereby achieving frequency adjustment; at the same time, the duty cycle can be adjusted to control the opening time of the variable frequency solenoid valve.

[0014] Another technical solution of the present invention is the control circuit of the drive-control integrated variable frequency DC solenoid valve, which is special in that it includes an isolation circuit electrically connected through an input interface to access the MCU, the MCU is electrically connected to the solenoid valve through an isolation drive amplifier circuit, the MCU is electrically connected to the LED display through a display drive circuit, and an external power supply supplies power to the MCU through a DC-DC power supply circuit; a button is connected to the MCU; PWM output is achieved through the MCU, and high and low level reversal is achieved by adjusting the count number, thereby achieving frequency adjustment; at the same time, the duty cycle can be adjusted to control the opening time of the variable frequency solenoid valve.

[0015] Another technical solution of the present invention is a control method of the drive-control integrated variable frequency DC solenoid valve, which is special in that it includes the following steps:

[0016] ⑴Set the frequency by pressing buttons and display it on LCD;

[0017] ⑵MCU runs the software program according to the set frequency, outputs PWM signal and drives the coil through the amplifier circuit;

[0018] ⑶ The coil switches the solenoid valve through PWM power on and off to achieve ventilation and air cut-off.

[0019] Preferably, step (2) further comprises: the MCU realizes high and low level reversal and frequency regulation by adjusting the counting amount; the MCU controls the opening time of the variable frequency solenoid valve by adjusting the duty cycle, which is 50% by default.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The drive + control + execution of the present invention is integrated, the wiring is simple, and the frequency conversion can be realized by itself, and no additional control circuit is required externally;

[0022] (2) The present invention displays the frequency in real time, which is more intuitive;

[0023] ⑶ The present invention provides a key interaction function to facilitate setting the frequency size. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a horizontal drive-control integrated variable frequency DC solenoid valve of the present invention;

[0025] Figure 2 It is a schematic diagram of the top view of the structure of the horizontal drive-control integrated variable frequency DC solenoid valve of the present invention;

[0026] Figure 3 yes Figure 2 AA section view;

[0027] Figure 4 It is a structural schematic diagram of a vertical drive-control integrated variable frequency DC solenoid valve of the present invention;

[0028] Figure 5 It is a schematic diagram of the top view of the structure of the vertical drive-control integrated variable frequency DC solenoid valve of the present invention;

[0029] Figure 6 yes Figure 5 BB section view;

[0030] Figure 7 It is a circuit block diagram of the drive-control integrated variable frequency DC solenoid valve of the present invention;

[0031] Figure 8 It is a schematic diagram of the control signal and micro PWM square wave of the drive-control integrated variable frequency DC solenoid valve of the present invention.

[0032] Main component symbols:

[0033] Button 1 LCD display window 2 Drive control board 3 Coil 4 Spool 5 Air Inlet 6 Air outlet 7 DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings:

[0035] Figures 1 to 3 An embodiment of the horizontal drive-control integrated variable frequency DC solenoid valve of the present invention is shown.

[0036] See also Figures 1 to 3 As shown, the drive-control integrated horizontal variable frequency DC solenoid valve is composed of a valve core 5 arranged in the valve body, a coil 4 mounted on the valve core 5, an air inlet 6 and an air outlet 7 respectively arranged at two symmetrical ends of the valve body along the coaxial line of the valve core 4, a drive control board 3 arranged on the inner wall of the valve body, and an LED display window 2 and a button 1 electrically connected to the drive control board 3 and exposed outside the valve body for displaying the current set frequency; a variable frequency PWM square wave signal is generated through the drive control board control circuit; the PWM square wave signal is loaded into the coil to generate a magnetic field, thereby driving the valve core to move; the PWM square wave signal is loaded into the coil 4 to generate a magnetic field, thereby driving the valve core 5 to move;

[0037] See also Figure 8 As shown in the figure, the convex horizontal line of the wave crest indicates that the solenoid valve is open, and the concave horizontal line of the wave trough indicates that the solenoid valve is closed; when the PWM square wave signal is at the wave crest, that is, the power-on state, a magnetic field is generated to push the valve core 5 toward the air inlet 6 to close the air path; when the PWM square wave signal is at the wave trough, that is, the power-off state, the magnetic field disappears, and the air pressure pushes the valve core 5 toward the air outlet to open the air path, thereby realizing the on and off of the air path.

[0038] The drive-control integrated variable frequency solenoid valve is installed by means of an L-shaped mounting bracket that penetrates axially along the valve wall.

[0039] Figures 4 to 6 An embodiment of the vertical drive-control integrated variable frequency DC solenoid valve of the present invention is shown.

[0040] See also Figures 4 to 6 As shown, the drive-control integrated vertical variable frequency DC solenoid valve is composed of a valve core 5 arranged in the valve body, a coil 4 mounted on the valve core 5, an air inlet 6 and an air outlet 7 radially arranged at the top of the valve body along the axis of the valve core 5, a drive control board 3 arranged on the inner wall of the valve body, and an LED display window 2 and a button 1 electrically connected to the drive control board 3 and exposed outside the valve body for displaying the current set frequency; the drive control board 3 controls and drives the variable frequency solenoid valve to generate a variable frequency PWM square wave signal; the PWM square wave signal is loaded into the coil 4 to generate a magnetic field, thereby driving the valve core 5 to move; please refer to Figure 8As shown in the figure, the convex horizontal line of the wave crest indicates that the solenoid valve is open, and the concave horizontal line of the wave trough indicates that the solenoid valve is closed; when the PWM square wave signal is at the wave crest, that is, the power-on state, a magnetic field is generated to push the valve core 5 toward the air inlet 6 to close the air path; when the PWM square wave signal is at the wave trough, that is, the power-off state, the magnetic field disappears, and the air pressure pushes the valve core 5 toward the air outlet to open the air path, thereby realizing the on and off of the air path.

[0041] Figure 7 An embodiment of a control circuit for driving and controlling an integrated variable frequency DC solenoid valve of the present invention is shown.

[0042] See also Figure 7 As shown, the control circuit includes an input interface controlled by a start-stop signal, an isolation circuit electrically connected through the input interface is connected to the MCU, the MCU is electrically connected to the solenoid valve through an isolation drive amplifier circuit, the MCU is electrically connected to the LED display through a display drive circuit, and an external power supply supplies power to the MCU through a DC-DC power supply circuit; a button is connected to the MCU; PWM output is realized through the MCU, and high and low level reversal is realized by adjusting the counting amount, thereby realizing frequency adjustment; at the same time, the duty cycle can be adjusted to control the opening time of the variable frequency solenoid valve, and the default is 50%.

[0043] The control method of the drive-control integrated variable frequency DC solenoid valve of the present invention comprises the following steps:

[0044] ⑴Set the frequency by pressing buttons and display it on LCD;

[0045] ⑵MCU runs the software program according to the set frequency, outputs PWM signal and drives the coil through the amplifier circuit;

[0046] ⑶MCU realizes high and low level reversal and frequency regulation by adjusting the counting quantity; MCU controls the opening time of the variable frequency solenoid valve by adjusting the duty cycle, which is 50% by default;

[0047] (4) The coil switches the solenoid valve on and off through PWM power-on and power-off to achieve ventilation and air cut-off.

[0048] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A drive-control integrated variable frequency DC solenoid valve, characterized in that: It consists of a valve core arranged in the valve body, a coil mounted on the valve core, an air inlet and an air outlet respectively arranged along the symmetrical ends of the valve body of the valve core, a drive control board arranged on the inner wall of the valve body, and an LED display window and a button electrically connected to the drive control board and exposed outside the valve body for displaying the current set frequency; a variable frequency PWM square wave signal is generated through the drive control board control circuit; the PWM square wave signal is loaded into the coil to generate a magnetic field, thereby driving the valve core to move.

2. The drive-control integrated variable frequency DC solenoid valve according to claim 1, characterized in that: The air inlet and the air outlet are axially arranged at two symmetrical ends of the valve body along the same axis of the valve core.

3. The drive-control integrated variable frequency DC solenoid valve according to claim 2, characterized in that: When the PWM square wave signal is at the peak, that is, the power-on state, a magnetic field is generated, pushing the valve core toward the air inlet side, closing the air path; when the PWM square wave signal is at the trough, that is, the power-off state, the magnetic field disappears, and the air pressure pushes the valve core toward the air outlet side, opening the air path and realizing the on and off of the air path.

4. The drive-control integrated variable frequency DC solenoid valve according to claim 2, characterized in that: The drive-control integrated variable frequency solenoid valve is installed by means of an L-shaped mounting bracket that penetrates axially along the valve wall.

5. The drive-control integrated variable frequency DC solenoid valve according to claim 1, characterized in that: The air inlet and the air outlet are respectively arranged radially along the valve body of the valve core axis.

6. The drive-control integrated variable frequency DC solenoid valve according to any one of claims 1 to 4, characterized in that: The control circuit includes an isolation circuit electrically connected through an input interface to access the MCU, the MCU is electrically connected to the solenoid valve through an isolation drive amplifier circuit, the MCU is electrically connected to the LED display through a display drive circuit, and an external power supply supplies power to the MCU through a DC-DC power supply circuit; a button is connected to the MCU; PWM output is achieved through the MCU, and high and low level reversal is achieved by adjusting the count number, thereby achieving frequency adjustment; at the same time, the duty cycle can be adjusted to control the opening time of the variable frequency solenoid valve.

7. A control circuit for driving and controlling an integrated variable frequency DC solenoid valve, characterized in that: The method includes connecting an isolation circuit electrically connected through an input interface to an MCU, electrically connecting the MCU to a solenoid valve through an isolation drive amplifier circuit, electrically connecting the MCU to an LED display screen through a display drive circuit, and an external power supply supplies power to the MCU through a DC-DC power supply circuit; connecting a button to the MCU; realizing PWM output through the MCU, realizing high and low level reversal by adjusting the count quantity, thereby realizing frequency adjustment; and at the same time, the duty cycle can be adjusted to control the opening time of the variable frequency solenoid valve.

8. A control method for a drive-control integrated variable frequency DC solenoid valve, characterized in that: The following steps are involved: ⑴Set the frequency by pressing buttons and display it on LCD; ⑵MCU runs the software program according to the set frequency, outputs PWM signal and drives the coil through the amplifier circuit; ⑶ The coil switches the solenoid valve through PWM power on and off to achieve ventilation and air cut-off.

9. The control method of the drive-control integrated variable frequency DC solenoid valve according to claim 8, characterized in that: The step (2) further includes: the MCU realizes high and low level reversal by adjusting the counting amount to realize frequency regulation; the MCU controls the opening time of the variable frequency solenoid valve by adjusting the duty cycle, which is 50% by default.

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