A circuit for isolating start-stop chemical pumps

Abstract

The application relates to the technical field of industrial electrical control, and particularly discloses a circuit for isolating start and stop of a chemical pump, which comprises a power distribution cabinet, the power distribution cabinet is connected with a first line, a first stop button and a relay are sequentially arranged on the first line, a power supply zero line of the relay is connected with the power distribution cabinet, a U-shaped line after the first stop button is connected with the first line, the U-shaped line surrounds the relay, a first start button is arranged on the U-shaped line, a second line is connected between the U-shaped line and the relay, the second line is after the first start button, a second stop button is arranged outside the U-shaped line, third and fourth lines are connected in parallel at the end of the first line after the second stop button, the ends of the third and fourth lines are connected with the power distribution cabinet, and a second start button is arranged on the fourth line. Through the cooperative action of the first and second start buttons, the on-site personnel are reminded to carry out on-site inspection before starting the chemical pump, and the safety hidden danger is eliminated.

Description

Technical Field

[0001] This utility model relates to the field of industrial electrical control technology, specifically to a circuit for isolating and starting a chemical pump. Background Technology

[0002] In chemical production processes, media are transported through pipelines, and various chemical pumps (such as centrifugal pumps and metering pumps) are extensively used between these pipelines for media transport control. These chemical pumps are typically driven by three-phase asynchronous motors, and their start-stop control is a routine operation. Currently, the common control method involves installing start / stop buttons on the distribution cabinet or on-site control column, allowing the chemical pumps to start and stop by pressing the buttons. Because the pipelines may be filled with media harmful to humans, and there may be perforations or valve leaks, posing potential dangers to on-site operations, personnel must conduct an on-site inspection before starting the chemical pump. Only after confirming safety can the start button be pressed to activate the pump. However, some workers may be lazy or forget to conduct on-site inspections, directly pressing the button to start the chemical pump without performing an on-site check, creating a safety hazard. Utility Model Content

[0003] The purpose of this utility model is to provide a circuit for isolating and starting / stopping chemical pumps, so as to solve the problem that existing chemical pumps can only be started with a single button, which poses a safety hazard when the button is pressed directly without on-site inspection.

[0004] To address the above issues, the following technical solution is provided: A circuit for isolating and starting a chemical pump includes a distribution cabinet and a chemical pump installed within a dike. The distribution cabinet is energized to start the chemical pump. The distribution cabinet is connected to a first line, on which a first stop button and a relay are sequentially installed. The neutral wire of the relay is connected to the distribution cabinet. A U-shaped line following the first stop button is connected to the first line, enclosing the relay. A first start button is installed on the U-shaped line. A second line is connected between the U-shaped line and the relay, following the first start button. A second stop button is installed on the first line extending beyond the U-shaped line. A third line and a fourth line are connected in parallel to the end of the first line following the second stop button. The ends of the third and fourth lines are both connected to the distribution cabinet. A second start button is installed on the fourth line.

[0005] The basic principle of the above technical solution is as follows: only after on-site inspection, pressing the first start button and the first stop button will energize the relay and keep it in operation, the distribution cabinet will have no output, and the chemical pump will not run. Only after pressing the second start button and the second stop button will the distribution cabinet receive the start signal and the chemical pump will start running. Pressing the first stop button and the second stop button will stop the distribution cabinet from working.

[0006] The beneficial effects of the above technical solution are as follows: Compared with the existing method of starting the chemical pump with just one button, this technical solution is equipped with a first start button and a second start button. Only after the first start button is pressed after on-site inspection, the relay will be activated, and only then can the second start button be pressed to start the chemical pump. If the second start button is pressed directly without on-site inspection, the distribution cabinet cannot be started, thus preventing the chemical pump from starting. This avoids starting the chemical pump without on-site inspection, thereby preventing safety hazards.

[0007] Furthermore, it also includes a first operating column and a second operating column. The first start button, the first stop button and the relay are all set on the first operating column. The first line extends from the distribution cabinet end to the first operating column and then continues to extend to the second operating column. The second start button and the second stop button are both set on the second operating column.

[0008] Furthermore, an operating column power fuse is connected to the first line preceding the first stop button.

[0009] Furthermore, the first operating column is located inside the cofferdam, and the second operating column is located outside the cofferdam. Only after inspecting the site inside the cofferdam and pressing the first start button can one go outside the cofferdam to press the second start button. Attached Figure Description

[0010] Figure 1 This is the circuit diagram of this utility model.

[0011] The reference numerals in the accompanying drawings are as follows: 1. Distribution cabinet; 2. First line; 3. First stop button; 4. Relay; 5. Power neutral line; 6. Operating column power fuse; 7. U-shaped line; 8. First start button; 9. Second line; 10. Second stop button; 11. Third line; 12. Fourth line; 13. Second start button. Detailed Implementation

[0012] The following detailed description illustrates the specific implementation method: A circuit for isolating and starting / stopping chemical pumps, such as Figure 1As shown, the system includes a power distribution cabinet 1 and a chemical pump installed inside the cofferdam. The power distribution cabinet 1 is energized to start the chemical pump. The power distribution cabinet 1 is connected to a first line 2. A first stop button 3 and a relay 4 are sequentially installed on the first line 2. The neutral wire 5 of the relay 4 is connected to the power distribution cabinet 1. An operating column power fuse 6 is connected to the first line 2 before the first stop button 3. A U-shaped line 7 is connected to the first line 2 after the first stop button 3. The U-shaped line 7 surrounds the relay 4. A first start button 8 is installed on the U-shaped line 7. A second line 9 is connected between the U-shaped line 7 and the relay 4. The second line 9 is after the first start button 8. A second stop button 10 is installed on the first line 2 extending beyond the U-shaped line 7. A third line 11 and a fourth line 12 are connected in parallel at the end of the first line 2 after the second stop button 10. The ends of the third line 11 and the fourth line 12 are both connected to the power distribution cabinet 1. A second start button 13 is installed on the fourth line 12.

[0013] It also includes a first operating column and a second operating column. The first start button 8, the first stop button 3, and the relay 4 are all located on the first operating column. The first line 2 extends from the distribution cabinet 1 to the first operating column, and then continues to the second operating column. The second start button 13 and the second stop button 10 are both located on the second operating column. The first operating column is located inside the cofferdam, and the second operating column is located outside the cofferdam.

[0014] The specific implementation process is as follows: Only after conducting an on-site inspection inside the cofferdam and pressing the first start button 8 and the first stop button 3, will relay 4 be energized and remain operational. Distribution cabinet 1 will have no output, and the chemical pump will not run. Then, pressing the second start button 13 and the second stop button 10 outside the cofferdam will activate distribution cabinet 1, allowing the chemical pump to start. Conversely, pressing either the first stop button 3 or the second stop button 10 will stop distribution cabinet 1, thus shutting down the chemical pump. This circuit, by having the first start button 8 and the second start button 13 work in tandem, reminds on-site personnel that a site inspection must be conducted before starting the chemical pump to eliminate any safety hazards.

[0015] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A circuit for isolating and starting a chemical pump, comprising a distribution cabinet and a chemical pump installed within a dike, wherein the distribution cabinet is energized to start the chemical pump, characterized in that: The distribution cabinet is connected to a first line, on which a first stop button and a relay are sequentially installed. The neutral wire of the relay is connected to the distribution cabinet. A U-shaped line following the first stop button is connected to the first line, surrounding the relay. A first start button is installed on the U-shaped line. A second line is connected between the U-shaped line and the relay, following the first start button. A second stop button is installed on the first line extending beyond the U-shaped line. A third line and a fourth line are connected in parallel to the end of the first line following the second stop button. The ends of the third and fourth lines are both connected to the distribution cabinet. A second start button is installed on the fourth line.

2. The circuit for isolating and starting / stopping a chemical pump according to claim 1, characterized in that: It also includes a first operating column and a second operating column. The first start button, the first stop button and the relay are all set on the first operating column. The first line extends from the distribution cabinet end to the first operating column and then continues to extend to the second operating column. The second start button and the second stop button are both set on the second operating column.

3. The circuit for isolating and starting / stopping a chemical pump according to claim 2, characterized in that: An operating column power fuse is connected to the first line before the first stop button.

4. The circuit for isolating and starting / stopping a chemical pump according to claim 3, characterized in that: The first operating column is located inside the cofferdam, and the second operating column is located outside the cofferdam.

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