Liquid level control device for petrochemical wastewater tank

Abstract

A petrochemical wastewater tank liquid level control device comprises a wastewater tank, an anti-slip baffle E is arranged at the bottom of a non-metal fixing rod A, a magnetic switch K1 is arranged in the non-metal fixing rod A, and the non-metal fixing rod A penetrates through a magnetic floater D, a common electrode C, a low liquid level electrode B and the non-metal fixing rod A to be connected with a machine pump automatic start-stop signal output circuit L; when the liquid level reaches the position of the magnetic switch K1, the automatic pump start-stop signal output circuit L outputs a pump start signal, and when the liquid level is lower than the bottom end of the low-liquid-level electrode B, the automatic pump start-stop signal output circuit L outputs a pump stop signal. By the adoption of the structure, starting and stopping of the machine pump are automatically controlled through output of starting and stopping signals, the working links of manual pump starting and stopping or routing inspection of operators can be reduced, and the situation that the machine pump is frequently started and stopped by mistake due to excessive foam in the waste water tank, and consequently the machine pump is damaged is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production auxiliary equipment, in particular to a petrochemical wastewater tank liquid level control device. Background Art

[0002] At present, in the field of petrochemical production, a certain amount of wastewater is often generated due to production needs, and the wastewater of the device is collected through the wastewater tank; the wastewater often contains a large amount of organic matter, and a large amount of foam will be generated during the flow process; the pump that pumps water from the wastewater tank to the sewage pool often uses a simple three-electrode level gauge to output the start and stop signals; the working principle of the simple three-electrode level gauge is to output the signal after the contact between the wastewater liquid surface and the electrode is connected, but due to the presence of foam on the liquid surface, it can also conduct electricity and output distorted signals, which often causes the wastewater tank motor to start or stop frequently, which can easily damage the pump; even due to excessive foam or liquid splashing, the pump does not stop, the wastewater tank liquid level is emptied, and the pump runs dry, which wastes energy and easily damages the pump. A level control device that can solve this defect is needed. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a petrochemical wastewater tank liquid level control device, which outputs a pump stop signal when the liquid level is low and outputs a pump stop signal when the liquid level is high through the rise and fall of the liquid level.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A petrochemical wastewater tank liquid level control device comprises a wastewater tank, wherein a common electrode C, a low liquid level electrode B and a non-metallic fixed rod A are arranged in the wastewater tank from low to high at the bottom, an anti-slip baffle E is arranged at the bottom of the non-metallic fixed rod A, a magnetic switch K1 is arranged in the non-metallic fixed rod A, the non-metallic fixed rod A penetrates a magnetic float D, the common electrode C, the low liquid level electrode B and the non-metallic fixed rod A are connected to a machine pump automatic start and stop signal output circuit L, when the liquid level reaches the position of the magnetic switch K1, the machine pump automatic start and stop signal output circuit L outputs a machine pump start signal, and when the liquid level is lower than the bottom end of the low liquid level electrode B, the machine pump automatic start and stop signal output circuit L outputs a machine pump stop signal.

[0006] The bottom end of the common electrode C is located at the bottom of the wastewater tank.

[0007] The density of the magnetic float D is lower than that of the waste liquid in the waste water tank.

[0008] The structure of the above-mentioned automatic start and stop signal output circuit L of the pump is:

[0009] It includes NAND gates D1-D4, the common electrode C is connected to the negative electrode of the power supply, the low liquid level electrode B and the magnetic switch K1 control the on and off of the base of the transistor V through the NAND gates D1-D4, one end of the contactor K is connected to the positive electrode of the power supply, and the other end is connected to the collector of the transistor V, the emitter of the transistor V is connected to the ground, and the contactor K controls the start and stop of the pump M.

[0010] The two inputs of the above-mentioned NAND gate D4 are connected to the low liquid level electrode B, the positive electrode of the power supply is connected to the NAND gate D4, the positive electrode of the power supply is connected to the low liquid level electrode B through the resistor R1, the output end of the NAND gate D4 is connected to the input end of the NAND gate D2, the other input end of the NAND gate D2 is connected to the input end of the NAND gate D3 and both are set to 1, the output end of the NAND gate D2 is connected to the input end of the NAND gate D1, the positive electrode of the power supply is connected to one end of the magnetic switch K1 through the resistor R2, the other end of the magnetic switch K1 is connected to the input end of the NAND gate D1, the output end of the NAND gate D1 is connected to the other input end of the NAND gate D3, and the output end of the NAND gate D3 is connected to the base of the transistor V through the resistor R3.

[0011] The utility model provides a petrochemical wastewater tank liquid level control device, which automatically controls the start and stop of a pump by outputting a start and stop signal, thereby reducing the operator's manual start and stop of the pump or inspection work links, and avoiding the wastewater tank pump from being frequently started and stopped by mistake due to excessive foam in the wastewater tank, thereby damaging the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0013] Figure 1 This is a circuit diagram of the wastewater tank liquid level control device of the utility model.

[0014] In the figure: non-metallic fixed rod A, low liquid level electrode B, common electrode C, magnetic float D, anti-slip baffle E, magnetic switch K1, machine pump automatic start and stop signal output circuit L, NAND gate D1-D4, transistor V, contactor K, machine pump M. DETAILED DESCRIPTION

[0015] like Figure 1 As shown in, a petrochemical wastewater tank liquid level control device includes a wastewater tank, in which a common electrode C, a low liquid level electrode B and a non-metallic fixed rod A are respectively arranged from low to high at the bottom position, an anti-slip baffle E is arranged at the bottom of the non-metallic fixed rod A, a magnetic switch K1 is arranged in the non-metallic fixed rod A, the non-metallic fixed rod A passes through a magnetic float D, the common electrode C, the low liquid level electrode B and the non-metallic fixed rod A are connected to a machine pump automatic start and stop signal output circuit L, when the liquid level reaches the position of the magnetic switch K1, the machine pump automatic start and stop signal output circuit L outputs a machine pump start signal, and when the liquid level is lower than the bottom of the low liquid level electrode B, the machine pump automatic start and stop signal output circuit L outputs a machine pump stop signal.

[0016] The bottom end of the common electrode C is located at the bottom of the wastewater tank.

[0017] The density of the magnetic float D is lower than that of the waste liquid in the waste water tank.

[0018] The structure of the above-mentioned automatic start and stop signal output circuit L of the pump is:

[0019] It includes NAND gates D1-D4, the common electrode C is connected to the negative electrode of the power supply, the low liquid level electrode B and the magnetic switch K1 control the on and off of the base of the transistor V through the NAND gates D1-D4, one end of the contactor K is connected to the positive electrode of the power supply, and the other end is connected to the collector of the transistor V, the emitter of the transistor V is connected to the ground, and the contactor K controls the start and stop of the pump M.

[0020] The two inputs of the above-mentioned NAND gate D4 are connected to the low liquid level electrode B, the positive electrode of the power supply is connected to the NAND gate D4, the positive electrode of the power supply is connected to the low liquid level electrode B through the resistor R1, the output end of the NAND gate D4 is connected to the input end of the NAND gate D2, the other input end of the NAND gate D2 is connected to the input end of the NAND gate D3 and both are set to 1, the output end of the NAND gate D2 is connected to the input end of the NAND gate D1, the positive electrode of the power supply is connected to one end of the magnetic switch K1 through the resistor R2, the other end of the magnetic switch K1 is connected to the input end of the NAND gate D1, the output end of the NAND gate D1 is connected to the other input end of the NAND gate D3, and the output end of the NAND gate D3 is connected to the base of the transistor V through the resistor R3.

[0021] Example:

[0022] like Figure 1 As shown, a magnetic float waste liquid tank level gauge and improved device, when the waste water tank level is high, the magnetic float D attracts the magnetic switch K1, and the "machine pump automatic start and stop signal output circuit L" outputs a start signal to start the machine pump M to discharge the waste water to the sewage treatment device.

[0023] Working principle:

[0024] As the liquid level drops, the magnetic float D falls on the non-metallic fixed rod along with the liquid level, K1 is disconnected, and finally the magnetic float falls on the baffle E;

[0025] When the liquid level drops to below the lowest point of electrode C, the "machine pump automatic start and stop signal output circuit L" outputs a stop signal and the machine pump stops running.

[0026] In a preferred solution, the density of the magnetic float D is less than the density of the waste liquid.

[0027] In the preferred embodiment, the middle hole of the magnetic float D passes through the non-metallic fixing rod A.

[0028] In the preferred solution, the bottom of the non-metallic fixing rod A is provided with an anti-slip baffle E

[0029] The working principle of the utility model is a magnetic float waste liquid tank level meter and an improved device. When the liquid level in the waste water tank is high, the magnetic float D attracts the magnetic switch K1, and the "machine pump automatic start and stop signal output circuit L" outputs a start signal to start the machine pump M to discharge the waste water to the sewage treatment device; as the liquid level drops, the magnetic float D falls on the non-metallic fixed rod along with the liquid level, K1 is disconnected, and finally the magnetic float falls on the baffle E; when the liquid level drops to the lowest point below the electrode C, the "machine pump automatic start and stop signal output circuit L" outputs a stop signal, and the machine pump stops running.

Claims

1. A petrochemical wastewater tank level control device, characterized in that: It includes a wastewater tank, in which a common electrode C, a low liquid level electrode B and a non-metallic fixed rod A are respectively arranged from low to high at the bottom position, an anti-slip baffle E is arranged at the bottom of the non-metallic fixed rod A, a magnetic switch K1 is arranged in the non-metallic fixed rod A, the non-metallic fixed rod A passes through a magnetic float D, the common electrode C, the low liquid level electrode B and the non-metallic fixed rod A are connected to a machine pump automatic start and stop signal output circuit L, when the liquid level reaches the position of the magnetic switch K1, the machine pump automatic start and stop signal output circuit L outputs a machine pump start signal, and when the liquid level is lower than the bottom of the low liquid level electrode B, the machine pump automatic start and stop signal output circuit L outputs a machine pump stop signal.

2. A petrochemical wastewater tank liquid level control device according to claim 1, characterized in that: The bottom end of the common electrode C is located at the bottom of the wastewater tank.

3. A petrochemical wastewater tank liquid level control device according to claim 2, characterized in that: The density of the magnetic float D is lower than that of the waste liquid in the waste water tank.

4. A petrochemical wastewater tank liquid level control device according to claim 3, characterized in that: The structure of the automatic start and stop signal output circuit L of the pump is: It includes NAND gates D1-D4, the common electrode C is connected to the negative electrode of the power supply, the low liquid level electrode B and the magnetic switch K1 control the on and off of the base of the transistor V through the NAND gates D1-D4, one end of the contactor K is connected to the positive electrode of the power supply, and the other end is connected to the collector of the transistor V, the emitter of the transistor V is connected to the ground, and the contactor K controls the start and stop of the pump M.

5. A petrochemical wastewater tank liquid level control device according to claim 4, characterized in that: The The two inputs of the NAND gate D4 are connected to the low liquid level electrode B, the positive electrode of the power supply is connected to the NAND gate D4, the positive electrode of the power supply is connected to the low liquid level electrode B through the resistor R1, the output end of the NAND gate D4 is connected to the input end of the NAND gate D2, the other input end of the NAND gate D2 is connected to the input end of the NAND gate D3 and both are set to 1, the output end of the NAND gate D2 is connected to the input end of the NAND gate D1, the positive electrode of the power supply is connected to one end of the magnetic switch K1 through the resistor R2, the other end of the magnetic switch K1 is connected to the input end of the NAND gate D1, the output end of the NAND gate D1 is connected to the other input end of the NAND gate D3, and the output end of the NAND gate D3 is connected to the base of the transistor V through the resistor R3.

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