Control device with function of preventing air blockage of pneumatic pump

Abstract

The utility model discloses a control device with a function of preventing air blockage of a pneumatic pump. The control device comprises a processor, an electromagnetic valve, the pneumatic pump and a pressure regulating valve, a coil unit of the electromagnetic valve is electrically connected with the processor, the pneumatic pump is connected with the first air outlet, and the pressure regulating valve is connected with the second air outlet of the electromagnetic valve and the first exhaust port. The processor drives the electromagnetic valve to act, and a first air outlet of the electromagnetic valve outputs a working air source to enable the pneumatic pump to operate and convey chemical liquid medicine. When the electromagnetic valve stops acting, the working gas source flows to the second gas outlet of the electromagnetic valve to the pressure regulating valve, a trace amount of working gas source regulated by the pressure regulating valve flows to the first gas outlet of the electromagnetic valve and is output through the first gas outlet to enable the chemical liquid to return to the pneumatic pump, and the pneumatic pump exhausts gas to enable the pneumatic pump to maintain positive pressure; and the pneumatic pump diaphragm is kept at a correct position without air blockage.

Description

Technical Field

[0001] This application relates to a chemical apparatus, and more particularly to a control device for preventing air pockets and crystallization in a pneumatic pump after the delivery of chemical liquid has been stopped. Background Technology

[0002] In the past, when chemical equipment in chemical plants needed to transport chemical solutions, the equipment would send signals to a PLC (Programmable Logic Controller), such as... Figure 1 , 2 As shown, after receiving the signal, the processor outputs a signal to drive the coil unit 21 of the solenoid valve 2 to start. The coil unit 21 will drive the valve core (not shown in the figure) inside the solenoid valve 2 to move, so that the working air source entering through the air inlet 26 will be output through the first air outlet 22 of the solenoid valve 2 to supply the working air source required by the pneumatic pump 3. When the pneumatic pump 3 receives the working air source, the diaphragm (not shown in the figure) inside will move left and right, generating thrust to deliver the chemical liquid.

[0003] When solenoid valve 2 does not receive an output signal from processor 1, solenoid valve 2 does not operate. At this time, the first outlet 22 of solenoid valve 2 stops supplying working air, and pneumatic pump 3 stops operating. The residual pressure of pneumatic pump 3 will be returned to the first exhaust port 24 through the first outlet 22.

[0004] When the pneumatic pump 3 stops operating, the original chemical solution remains in the diaphragm chamber inside the pneumatic pump 3. This chemical solution is prone to producing chemical gases and crystals, which could easily lead to air blockage. When the pneumatic pump 3 is driven to operate again, the first air outlet 22 of the solenoid valve 2 will supply working air to the pneumatic pump 3, but will not be able to drive the pneumatic pump 3 to work.

[0005] Therefore, the problem to be solved in this application is how to prevent the chemical liquid in the diaphragm chamber of the pneumatic pump 3 from producing chemical gases and crystals, and how to ensure that the pneumatic pump 3 can be driven smoothly the next time it is driven. Utility Model Content

[0006] The main purpose of this application is to address the shortcomings of traditional methods. This application connects a pressure regulating valve in series between the second outlet (normally open contact) and the first exhaust port of a five-port two-position solenoid valve. When the pneumatic pump stops operating, it maintains positive pressure on the pneumatic pump, ensuring that the diaphragm of the pneumatic pump remains in the correct position and does not become clogged.

[0007] To achieve the above objectives, this application provides a control device with a function to prevent airlock in a pneumatic pump, installed on a chemical device, comprising: a processor, a solenoid valve, a pneumatic pump, and a pressure regulating valve. The processor receives a signal indicating that the chemical device is in operation to deliver a chemical solution, and outputs a control signal. The solenoid valve includes a coil unit, a first outlet, a second outlet, a first exhaust port, a second exhaust port, and an inlet port; the coil unit is electrically connected to the processor, and the inlet port is connected to an external air supply unit to input the required working air source. The pneumatic pump is connected to the first outlet. The pressure regulating valve has an input terminal and an output terminal; the input terminal is connected to the second outlet, and the output terminal is connected to the first exhaust port. When the processor receives the signal to deliver the chemical liquid, it outputs a signal to drive the coil unit to operate. The working air source entering through the air inlet flows to the first air outlet, and the working air source is output from the first air outlet to make the pneumatic pump operate to deliver the chemical liquid. When the solenoid valve stops operating, the working air source entering through the air inlet flows to the second air outlet, and from the second air outlet to the pressure regulating valve. The pressure regulating valve adjusts the working air source to a small amount, which is then output to the first exhaust port, and from the first exhaust port to the first air outlet. The small amount of working air source output from the first air outlet pushes the chemical liquid back into the pneumatic pump, and the pneumatic pump exhausts the gas.

[0008] In one embodiment of this application, the processor is a programmable logic controller.

[0009] In one embodiment of this application, when the coil unit of the solenoid valve is not driven by the processor, the valve core inside the solenoid valve does not move, the air inlet and the second air outlet are connected, and exhaust is performed through the second exhaust outlet; at this time, the first air outlet and the air inlet are not connected.

[0010] In one embodiment of this application, when the coil unit of the solenoid valve is driven by the processor, the coil unit drives the valve core inside the solenoid valve to move, and the first air outlet and the air inlet are connected, and exhaust is performed through the first exhaust port; at this time, the second air outlet and the air inlet are not connected.

[0011] In one embodiment of this application, the pressure regulating valve is a 0.5Kg pressure regulating valve. Attached Figure Description

[0012] The above and other objects, features, and advantages of this utility model will become clearer through the detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this utility model.

[0013] Figure 1 A circuit block diagram and a schematic diagram of solenoid valve operation for a control device used in the delivery of chemical solutions in traditional chemical equipment.

[0014] Figure 2 for Figure 1 A schematic diagram showing the solenoid valve stopping its operation;

[0015] Figure 3 This is a circuit block diagram and a schematic diagram of the solenoid valve operation of the control device for the chemical liquid delivery of the chemical equipment of this application.

[0016] Figure 4 for Figure 3 A schematic diagram showing the solenoid valve stopping its operation.

[0017] Figure label:

[0018] 1: Processor

[0019] 2: Solenoid valve

[0020] 21: Coil Unit

[0021] 22: First air outlet

[0022] 23: Second air outlet

[0023] 24: First exhaust port

[0024] 25: Second exhaust port

[0025] 26: Air Inlet

[0026] 3: Pneumatic pump

[0027] 4: Pressure regulating valve

[0028] 41: Input terminal

[0029] 42: Output terminal Detailed Implementation

[0030] Numerous specific details are provided in this specification to provide a thorough understanding of the specific embodiments of the present invention; however, those skilled in the art will recognize that the purpose of the present invention can still be achieved without one or more of these specific details; in other cases, well-known details have not been shown or described to avoid obscuring the main technical features of the present invention. A detailed description and technical content of the present invention are illustrated below with reference to the accompanying drawings; however, the drawings are provided for reference and illustration only and are not intended to limit the scope of the present invention.

[0031] The technical content and detailed description of this application are explained below with reference to the accompanying drawings:

[0032] Please see Figure 3, 4 The circuit block diagram and operation schematic of the control device for the chemical liquid delivery of the chemical equipment in this application are as follows: Figure 1 A schematic diagram of the solenoid valve stopping operation. As shown in the figure: The control device for preventing airlock in the pneumatic pump of this application includes: a processor 1, a solenoid valve 2, a pneumatic pump 3, and a pressure regulating valve 4.

[0033] The processor 1, installed inside a chemical device (not shown in the diagram), receives a start signal from the chemical device when it needs to start the delivery of chemical liquids (products). The processor 1 then outputs a control signal to activate the solenoid valve 2. In this diagram, the processor 1 is a programmable logic controller (PLC), a digital electronic device specifically designed for automated control systems.

[0034] The solenoid valve 2 includes a coil unit 21, a first air outlet 22, a second air outlet 23, a first exhaust port 24, a second exhaust port 25, and an air inlet 26. The coil unit 21 is electrically connected to the processor 1. When the coil unit 21 of the solenoid valve 2 is not driven by the processor 1, the valve core (not shown in the figure) inside the solenoid valve 2 does not operate. At this time, the air inlet 26 and the second air outlet 23 are connected (the first air outlet 22 and the air inlet 26 are not connected), and exhaust is performed through the second exhaust port 25. When the coil unit 21 of the solenoid valve 2 is driven by the processor 1, the coil unit 21 drives the valve core (not shown in the figure) inside the solenoid valve 2 to operate, so that the first air outlet 22 and the air inlet 26 are connected (the second air outlet 23 and the air inlet 26 are not connected), and exhaust is performed through the first exhaust port 24. The aforementioned air inlet 26 is connected to an external air supply unit (not shown in the figure) to input the required working air source. In this diagram, the solenoid valve 2 is a single-coil, five-port, two-position solenoid valve.

[0035] The pneumatic pump 3 is connected to the first outlet 22 of the solenoid valve 2. When the solenoid valve 2 is activated, the working air source entering through the inlet 26 flows to the first outlet 22, and the working air source is output from the first outlet 22 to the pneumatic pump 3. The working air source is used to drive the diaphragm (not shown in the figure) to move, thereby driving the delivery of chemical liquid.

[0036] The pressure regulating valve 4 has an input terminal 41 and an output terminal 42. The input terminal 41 is connected to the second outlet 23 of the solenoid valve 2, and the output terminal 42 is connected to the first exhaust port 24 of the solenoid valve 2. When the solenoid valve 2 stops operating, the working air source entering the solenoid valve 2 through the inlet 26 and exiting through the second outlet 23 is adjusted to a small amount by the pressure regulating valve 4 before entering through the first exhaust port 24 and flowing to the first outlet 22 to provide a small positive pressure supply of working air. This pushes the chemical solution back to the pneumatic pump 3, where it is exhausted, ensuring that the pneumatic pump 3 is not affected by the chemical solution and that the internal diaphragm of the pneumatic pump 3 remains in the correct position. In this diagram, the pressure regulating valve 4 is a 0.5 kg pressure regulating valve.

[0037] Continued Figure 3 As indicated by the arrow, when the chemical equipment in the chemical plant needs to transport chemical liquids (products), the processor 1 will receive a start signal and output a DC24V DC voltage source control signal to the coil unit 21 of the solenoid valve 2 to start the coil unit 21 to operate, and cause the valve core (not shown in the figure) inside the solenoid valve 2 to be attracted by the electromagnetic field or magnetically pushed to move, so that the working air source input by the air inlet 26 is output from the first air outlet 22 to supply the pneumatic pump 3 with a working air source of about 3Kg or more. When the pneumatic pump 3 receives the working air source, the diaphragm inside the pneumatic pump 3 will move left and right to generate thrust to transport the chemical liquid.

[0038] To be continued... Figure 4 As indicated by the arrow, when solenoid valve 2 does not receive an output signal from processor 1, the coil unit 21 of solenoid valve 2 does not operate, causing the valve core inside solenoid valve 2 to return to its original position. This stops the supply of working air to the first outlet 22, and pneumatic pump 3 also stops operating. At this time, the working air entering solenoid valve 2 through inlet 26 is output through the second outlet 23, adjusted to a small amount by pressure regulating valve 4, and then enters through the first exhaust port 24 and flows to the first outlet 22 for output. This small amount of working air pushes the chemical liquid back to pneumatic pump 3, where it is then exhausted. This design maintains positive pressure in pneumatic pump 3, ensuring that the airlock in pneumatic pump 3 is not affected by the chemical liquid, but rather keeps the internal diaphragm of pneumatic pump 3 in the correct position.

[0039] Compared to traditional technologies, such as Figure 1 , 2 As shown, when the pressure regulating valve 4 is not installed, similarly, when the coil unit 21 of the solenoid valve 2 receives the output signal from the processor 1 and is activated, the working air source entering through the air inlet 26 is output to the pneumatic pump 3 (e.g., when the pressure regulating valve 4 is not installed) through the first air outlet 22 of the solenoid valve 2. Figure 1As indicated by the arrow, when the pneumatic pump 3 receives the working air source, the diaphragm (not shown in the figure) inside the pneumatic pump 3 moves left and right, generating thrust to deliver the chemical liquid. When the solenoid valve 2 does not receive an output signal from the processor 1, the solenoid valve 2 does not operate. At this time, the first outlet 22 of the solenoid valve 2 stops supplying the working air source, and the pneumatic pump 3 stops operating. The residual pressure of the pneumatic pump 3 will be returned to the first exhaust port 24 through the first outlet 22 (as shown by the arrow). Figure 2 (As indicated by the arrow direction).

[0040] Therefore, when the pneumatic pump 3 stops operating in the aforementioned conventional chemical equipment, the original chemical solution remains in the diaphragm chamber inside the pneumatic pump 3. This chemical solution is prone to producing chemical gases and crystals, which could easily lead to air blockage. Consequently, when the pneumatic pump 3 starts operating again, the first outlet 22 of the solenoid valve 2 will supply working air to the pneumatic pump 3, preventing it from driving the pneumatic pump 3 to operate.

[0041] Therefore, it can be seen that by connecting a pressure regulating valve 4 weighing approximately 0.5 kg between the second outlet 23 and the first exhaust port 24 of the solenoid valve 2, when the pneumatic pump 3 stops operating, a small amount of positive pressure from the working air source is provided through the pressure regulating valve 4. This ensures that the pneumatic pump 3 is not affected by the chemical liquid and that the diaphragm (not shown in the figure) inside the pneumatic pump 3 remains in the correct position. Consequently, when the pneumatic pump 3 starts operating again, the first outlet 22 of the solenoid valve 2 supplies working air to the pneumatic pump 3, and the pneumatic pump 3 will be able to operate smoothly.

[0042] The above description is merely a preferred embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. All equivalent variations and modifications made according to the claims of this utility model should still fall within the scope of protection intended by this utility model. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. This utility model may also have other embodiments. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the claims of this utility model.

Claims

1. A control device with a function to prevent airlock in pneumatic pumps, installed on chemical equipment, characterized in that, include: A processor is configured to receive a signal indicating that the chemical equipment is in operation and is delivering a chemical solution, and to output a control signal. A solenoid valve includes a coil unit, a first air outlet, a second air outlet, a first exhaust port, a second exhaust port, and an air inlet; wherein the coil unit is electrically connected to the processor, and the air inlet is connected to an external air supply unit to input the required working air source. A pneumatic pump is connected to the first air outlet; A pressure regulating valve has an input terminal and an output terminal, wherein the input terminal is connected to the second air outlet and the output terminal is connected to the first exhaust port; When the processor receives the signal to deliver the chemical liquid, it outputs a signal to drive the coil unit to operate. The working air source entering through the air inlet flows to the first air outlet, and the working air source output from the first air outlet causes the pneumatic pump to operate and deliver the chemical liquid. When the solenoid valve stops operating, the working air source entering through the air inlet flows to the second air outlet, and from the second air outlet flows to the pressure regulating valve. The pressure regulating valve adjusts the working air source to a small amount, which then flows to the first exhaust port, and from the first exhaust port flows back to the first air outlet. The working air source output from the first air outlet pushes the chemical liquid back into the pneumatic pump, where the pneumatic pump exhausts the gas.

2. The control device having a function of preventing a pneumatic pumping airlock according to claim 1, wherein in, The processor is a programmable logic controller.

3. The control device having a function of preventing a pneumatic pumping airlock according to claim 1, wherein in, When the coil unit of the solenoid valve is not driven by the processor, the valve core inside the solenoid valve does not move, the air inlet and the second air outlet are connected, and exhaust is carried out through the second exhaust outlet; at this time, the first air outlet and the air inlet are not connected.

4. The control device having a function of preventing a pneumatic pumping airlock according to claim 3, wherein in, When the coil unit of the solenoid valve is driven by the processor, the coil unit drives the valve core inside the solenoid valve to move, and the first air outlet and the air inlet are connected, and exhaust is performed through the first air outlet; at this time, the second air outlet and the air inlet are not connected.

5. The control device having a function of preventing a pneumatic pumping airlock according to claim 3, wherein in, The pressure regulating valve is a 0.5Kg pressure regulating valve.

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