Automatic liquid adding device of self-priming pump

Abstract

The utility model discloses an automatic liquid adding device of a self-priming pump, which comprises a self-priming pump body, the self-priming pump body is provided with a liquid inlet end and a liquid outlet end, the liquid inlet end is connected with a liquid inlet pipe, the liquid outlet end is connected with a liquid outlet tee joint, the other two connectors of the liquid outlet tee joint are respectively connected with a liquid outlet pipe and a liquid storage tank, the liquid outlet pipe is connected with a liquid supplementing branch pipe, and the liquid supplementing branch pipe is connected with a liquid supplementing pipeline. The other end of the liquid supplementing branch pipe is communicated with the liquid storage tank, and an electromagnetic valve is installed on the liquid supplementing branch pipe and is in linkage control with a metal electrode bar fixed to the top of the liquid storage tank. By the adoption of the device, automatic liquid supplementing can be achieved subsequently only by filling the pump shell with the solution when the self-priming pump is installed, the problem that the self-priming pump can work only by adding the solution into the liquid storage tank every time before being started is solved, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of pump technology, and in particular to an automatic liquid filling device for a self-priming pump. Background Technology

[0002] Self-priming pumps require the pump casing to be filled with water before starting. After starting, a vacuum is created, allowing the pump to draw in and deliver solutions. Current practice involves adding a storage tank to the top of the pump. Before starting, the solution is added to the tank, flows into the pump casing, and then the pump begins operation. The biggest problem with this method is that the pump needs to have solution added to the storage tank before each start-up, which reduces efficiency.

[0003] To address this, Chinese utility model patent CN201820638989.2 proposes a self-priming pump with automatic water replenishment function, comprising a motor, a controller, a self-priming pump, a storage tank, an electric ball valve, and a connecting pipe. The self-priming pump has an outlet on the top of its casing and an inlet on the side of its casing. An impeller is installed inside the pump casing, with one end of the impeller shaft connected to the motor. The controller is mounted on the motor. The electric ball valve is divided into a first electric ball valve and a second electric ball valve, and the connecting pipe is divided into a first connecting pipe and a second connecting pipe. The storage tank is connected to the outlet via the first connecting pipe and to the inlet via the second connecting pipe. A first electric ball valve is installed on the first connecting pipe, and a second electric ball valve is installed on the second connecting pipe. A level sensor is installed inside the storage tank, and a vent is provided on the top of the storage tank. This design enables timely water replenishment to the pump casing through the storage tank and level sensor. Its structure is simple, easy to connect, and facilitates subsequent installation and maintenance.

[0004] However, the above-mentioned device has an overly complex structure. Although it can replenish water with a self-priming pump in a timely manner, it cannot supply water that is missing in the water tank in a timely manner, thus reducing the efficiency of the self-priming pump when replenishing water. In order to solve the above problems, a self-priming pump water replenishment device is needed. Utility Model Content

[0005] The purpose of this utility model is to disclose an automatic liquid addition device for a self-priming pump. An automatic liquid addition device is installed on the liquid outlet pipe of the self-priming pump. After installation, the self-priming pump can work without adding solution to the storage tank before starting, thereby improving work efficiency.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] An automatic liquid addition device for a self-priming pump includes a self-priming pump body, which has an inlet end and an outlet end. An inlet pipe is connected to the inlet end, and an outlet tee is connected to the outlet end. The other two ports of the outlet tee are respectively connected to an outlet pipe and a storage tank. A replenishment branch pipe is connected to the outlet pipe, and the other end of the replenishment branch pipe is connected to the storage tank. A solenoid valve is installed on the replenishment branch pipe, and the solenoid valve is linked and controlled by a metal electrode rod fixed on the top of the storage tank.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] Two metal rods are inserted into the storage tank and connected to a PLC controller via wires. When the solution in the storage tank rises to the set level, the two metal rods become electrically connected due to the solution, forming a circuit with the PLC controller and closing the solenoid valve. When the solution flows into the pump housing, the metal rods detach from the solution, breaking the circuit with the PLC controller and opening the solenoid valve. At this point, after the self-priming pump starts, the solution enters the storage tank through the replenishment branch pipe and the open solenoid valve. When the solution level in the storage tank rises to the set level, the solenoid valve closes again. This cycle repeats automatically, allowing the storage tank to be replenished with solution, eliminating the need to add solution to the storage tank before each start-up of the self-priming pump and improving work efficiency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] In the diagram, 1-storage tank, 2-self-priming pump body, 3-solenoid valve, 4-PLC controller, 5-metal electrode rod, 6-inlet pipe, 7-outlet tee, 8-outlet pipe, 9-replenishment branch pipe. Detailed Implementation

[0012] The present invention will be further explained below with reference to the accompanying drawings.

[0013] like Figure 1 As shown, an automatic liquid addition device for a self-priming pump includes a self-priming pump body 2, which has an inlet end and an outlet end. An inlet pipe 6 is connected to the inlet end, and an outlet tee 7 is connected to the outlet end. The other two ports of the outlet tee 7 are respectively connected to an outlet pipe 8 and a storage tank 1. A replenishment branch pipe 9 is connected to the outlet pipe 8. The other end of the replenishment branch pipe 9 is connected to the storage tank 1, and a solenoid valve 3 is installed on the replenishment branch pipe 9. The solenoid valve 3 and a metal electrode rod 5 fixed on the top of the storage tank 1 are controlled by a PLC controller 4 on site.

[0014] In order to achieve both normal liquid output and liquid replenishment, the diameter of the liquid replenishment branch pipe 9 is 1 / 3 to 1 / 2 of the diameter of the liquid output pipe 8.

[0015] To improve the accuracy of liquid replenishment and ensure the reliability of the device, the inlet of the liquid replenishment branch pipe 9 is at the same height as the metal electrode rod 5. The volume of the solution in the storage tank indicated by the bottom height of the metal electrode rod 5 should be 1.5 to 2 times larger than the volume of the pump casing of the self-priming pump body 2. After the height of the metal electrode rod is determined, it is fixed by adding a bracket or cover plate, etc. Each metal electrode rod is connected to a wire, which is connected to the PLC controller. The PLC controller is linked with the solenoid valve for control.

[0016] When the solution level in the storage tank rises to the lowest point of the metal electrode rod, the solution contacts the metal electrode rod. Because the solution conducts electricity, the metal electrode rod is connected to the PLC controller, forming a conductive circuit. The PLC controller then closes the solenoid valve, and the solution level in the storage tank stops rising.

[0017] When the solution flows from the storage tank into the self-priming pump casing, the liquid level drops, and the metal rod detaches from the solution. At this point, the PLC controller receives a circuit disconnection signal and operates the solenoid valve to open. The next time the self-priming pump starts, the solution can flow into the storage tank through the replenishment branch pipe and the open solenoid valve. When the solution level in the storage tank rises to the lowest point of the metal electrode rod, the solenoid valve closes again. This cycle repeats, thus achieving automatic liquid addition.

[0018] Using the above device, the pump casing only needs to be filled with solution during the installation of the pump, and automatic replenishment can be achieved thereafter. This solves the problem that the self-priming pump needs to be filled with solution in the storage tank before it can work, thus improving work efficiency.

Claims

1. An automatic liquid dosing device for a self-priming pump, characterized in that, The pump includes a self-priming pump body (2), which is provided with an inlet end and an outlet end. An inlet pipe (6) is connected to the inlet end, and an outlet tee (7) is connected to the outlet end. The other two ports of the outlet tee (7) are respectively connected to an outlet pipe (8) and a storage tank (1). A replenishment branch pipe (9) is connected to the outlet pipe (8). The other end of the replenishment branch pipe (9) is connected to the storage tank (1), and a solenoid valve (3) is installed on the replenishment branch pipe (9). The solenoid valve (3) is linked and controlled with a metal electrode rod (5) fixed on the top of the storage tank (1).

2. The self-priming pump automatic liquid dosing device as described in claim 1, characterized in that, The diameter of the replenishment branch pipe (9) is 1 / 3 to 1 / 2 of the diameter of the outlet pipe (8).

3. The automatic liquid addition device for a self-priming pump as described in claim 1, characterized in that, The solenoid valve (3) is controlled by the PLC controller (4) installed on site and the metal electrode rod (5) in linkage.

4. The automatic liquid addition device for a self-priming pump as described in claim 1, characterized in that, The opening of the replenishment branch pipe (9) is at the same height as the metal electrode rod (5).

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