Liquid self-priming delivery device

Abstract

The utility model relates to liquid delivery equipment technical field discloses a kind of liquid self-suction conveying devices, including pit tank and use workshop, further including buffer tank, pipeline centrifugal pump, storage tank and valve system controlled by PLC, buffer tank is corrosion-resistant closed pressure vessel, its top is communicated with pit tank by liquid inlet pipe, liquid inlet valve is equipped on liquid inlet pipe, buffer tank top is further equipped with liquid guide pipe and exhaust pipe, the bottom of buffer tank is connected with the import of pipeline centrifugal pump by liquid outlet pipe, pump front valve is equipped on liquid outlet pipe, the import of storage tank is connected with use workshop by conveying pipe for the outlet of pipeline centrifugal pump, the outlet of storage tank is connected with use workshop by supply pipe, outlet valve is equipped on supply pipe, device core power equipment pipeline centrifugal pump and motor are located ground, avoid the erosion of corrosive liquid, discard complex independent vacuum system, utilize pipeline centrifugal pump self-liquid discharge for buffer tank vacuumizing, system integration degree is high.

Description

Technical Field

[0001] This utility model relates to the field of liquid conveying equipment technology, specifically to a liquid self-priming conveying device. Background Technology

[0002] In industrial production settings, workshop circulating water tanks and wastewater collection tanks are often located in underground pits. The liquid within these tanks needs to be transported to the production line or subsequent treatment units via conveying equipment. Currently, submersible pumps are commonly used, directly immersed in corrosive liquids for transport. This method results in the pump body, seals, and motor being exposed to a corrosive environment for extended periods, leading to extremely short equipment lifespans, frequent malfunctions, high maintenance costs, and safety hazards such as leaks and electric shock.

[0003] For example, CN204824130U discloses a corrosive liquid conveying device, which uses an independent vacuum pumping device to evacuate the vacuum box, uses atmospheric pressure to force the liquid into the vacuum box, and then relies on the liquid level difference or an auxiliary pump to deliver it. This method relies on two sets of vacuum boxes and valve groups working alternately, with frequent valve switching and a complex process. The final delivery of the liquid relies on the gravity flow of the liquid after the vacuum is broken. Its delivery height is directly limited by the level difference between the vacuum box and the high-level water tank, making it difficult to meet the needs of higher or longer delivery distances. Summary of the Invention

[0004] Therefore, the purpose of this utility model is to provide a liquid self-priming conveying device that can effectively solve the problems mentioned in the background art.

[0005] This utility model adopts the following technical solution: a liquid self-priming conveying device, including a pit pool and a workshop, and also includes a buffer tank, a pipeline centrifugal pump, a storage tank, and a valve system controlled by a PLC. The buffer tank is a corrosion-resistant, sealed pressure vessel. Its top is connected to the pit pool through an inlet pipe, and an inlet valve is provided on the inlet pipe. The top of the buffer tank is also provided with a liquid inlet pipe and an exhaust pipe. The bottom of the buffer tank is connected to the inlet of the pipeline centrifugal pump through an outlet pipe, and a pre-pump valve is provided on the outlet pipe. The outlet of the pipeline centrifugal pump is connected to the inlet of the storage tank through a delivery pipe. The outlet of the storage tank is connected to the workshop through a supply pipe, and an outlet valve is provided on the supply pipe.

[0006] Furthermore, the liquid inlet tube is equipped with a liquid inlet valve, and the exhaust pipe is equipped with a vacuum breaking valve.

[0007] Furthermore, the device also includes a PLC control system, which is electrically connected to the pipeline centrifugal pump, inlet valve, pump front valve, outlet valve, priming valve, and vacuum breaking valve.

[0008] Furthermore, the buffer tank is equipped with a pressure transmitter for detecting its internal pressure, and the pressure transmitter is electrically connected to the PLC control system.

[0009] Furthermore, the storage tank is equipped with a level switch for detecting the internal liquid level, and the level switch is electrically connected to the PLC control system.

[0010] Furthermore, the buffer tank and storage tank are made of polypropylene, polyvinylidene fluoride, or reinforced fiberglass.

[0011] Compared with the prior art, the advantages of this utility model are as follows: The core power equipment of this device, the pipeline centrifugal pump and motor, are located on the ground, avoiding the corrosion of corrosive liquids and greatly extending the service life of the equipment. It eliminates the need for a complex independent vacuum system and uses the pipeline centrifugal pump itself to discharge liquid to create a vacuum in the buffer tank. The system has a high degree of integration and low investment and operating costs. The conveying process is completed by the pipeline centrifugal pump, which can achieve continuous and stable fluid conveying. Its head depends only on the power of the pump, which can meet the needs of conveying over long distances. The unique vacuum breaking design can prevent liquid backflow when the device is stopped, ensuring that the device is in standby mode. Attached Figure Description

[0012] Figure 1 This is a schematic diagram illustrating the driving principle of this utility model; Figure 2 This is a schematic diagram of the parking state of this utility model; In the diagram: 1. Pit water tank; 2. Buffer tank; 3. Pipeline centrifugal pump; 4. Storage tank; 5. Workshop; 6. Inlet valve; 7. Pump front valve; 8. Outlet valve; 9. Priming valve; 10. Vacuum breaking valve. Detailed Implementation

[0013] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0014] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0015] Please see Figure 1 , Figure 2As shown, a liquid self-priming conveying device includes a sump pool 1 and a working workshop 5, as well as a buffer tank 2, a pipeline centrifugal pump 3, a storage tank 4, and a valve system controlled by a PLC. The buffer tank 2 is a corrosion-resistant, sealed pressure vessel. Its top is connected to the sump pool 1 through an inlet pipe, and an inlet valve 6 is provided on the inlet pipe. The top of the buffer tank 2 is also provided with a liquid inlet pipe and an exhaust pipe. The bottom of the buffer tank 2 is connected to the inlet of the pipeline centrifugal pump 3 through an outlet pipe, and a pump pre-valve 7 is provided on the outlet pipe. The outlet of the pipeline centrifugal pump 3 is connected to the inlet of the storage tank 4 through a delivery pipe. The outlet of the storage tank 4 is connected to the working workshop 5 through a supply pipe, and an outlet valve 8 is provided on the supply pipe.

[0016] Specifically, the liquid inlet tube is equipped with a liquid inlet valve 9, and the exhaust pipe is equipped with a vacuum breaking valve 10.

[0017] Specifically, the device also includes a PLC control system, which is electrically connected to the pipeline centrifugal pump 3, the inlet valve 6, the pump front valve 7, the outlet valve 8, the priming valve 9, and the vacuum breaking valve 10.

[0018] Specifically, the buffer tank 2 is equipped with a pressure transmitter for detecting its internal pressure, and the pressure transmitter is electrically connected to the PLC control system.

[0019] Specifically, the storage tank 4 is equipped with a level switch for detecting the liquid level inside, and the level switch is electrically connected to the PLC control system.

[0020] Specifically, the buffer tank 2 and the storage tank 4 are made of polypropylene, polyvinylidene fluoride or reinforced fiberglass.

[0021] Specifically, a PLC control system can be added. Replace all the above valves with electric or pneumatic valves and connect them electrically to the PLC controller. At the same time, install a pressure transmitter on buffer tank 2 and a level switch on storage tank 4, all of which are connected to the PLC.

[0022] One embodiment of this utility model: During the preparation phase, close the inlet valve 6 and the pump inlet valve 7, open the priming valve 9 and the vacuum breaking valve 10, and inject clean priming liquid (water or a non-corrosive liquid of the same type) into the buffer tank 2 through the priming pipe until the tank is full, completely expelling the air from the tank. Then, close the priming valve 9 and the vacuum breaking valve 10. This step is only required after the first startup or maintenance of the device.

[0023] When starting the engine, the PLC control system is programmed to control the devices to start in the following sequence: Open the inlet valve 7 and outlet valve 8, and then start the pipeline centrifugal pump 3. The pump starts to draw liquid from the bottom of the buffer tank 2 and pump it to the storage tank 4, and then supply it to the use workshop 5. As the priming liquid is drawn away, the liquid level in the sealed buffer tank 2 drops, forming a negative pressure (vacuum). When the vacuum degree in the tank reaches a certain level, open the inlet valve 6. At this time, the corrosive liquid in the pit pool 1 is continuously forced into the buffer tank 2 under the pressure difference between the negative pressure inside the buffer tank 2 and the atmospheric pressure on the surface of the pit pool liquid. The pipeline centrifugal pump 3 then continuously transports the newly drawn corrosive liquid and the remaining priming liquid out, and the device enters a stable operating state.

[0024] When stopping, the PLC control system is programmed to control the device to stop safely in the following sequence: First, stop the pipeline centrifugal pump 3, then close the inlet valve 6 to isolate the sump liquid, and finally open the vacuum breaking valve 10 to allow the buffer tank 2 to communicate with the atmosphere, breaking the vacuum and effectively eliminating the negative pressure in the buffer tank 2. This prevents the liquid in the storage tank 4 and pipeline from flowing back into the buffer tank 2 or the sump due to siphoning. After stopping, there will be enough liquid in the buffer tank 2, so there is no need to re-prime it when starting it up next time. This allows for long-term use with just one priming.

[0025] If the liquid level in buffer tank 2 is too low or the pressure is abnormal during operation, the PLC can automatically stop the pump and issue an alarm.

[0026] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A liquid self-priming conveying device, comprising a sump pool (1) and a workshop (5), characterized in that: It also includes a buffer tank (2), a pipeline centrifugal pump (3), a storage tank (4), and a valve system controlled by a PLC. The buffer tank (2) is a corrosion-resistant, sealed pressure vessel. Its top is connected to the pit water tank (1) through an inlet pipe. An inlet valve (6) is provided on the inlet pipe. The top of the buffer tank (2) is also provided with a liquid inlet pipe and an exhaust pipe. The bottom of the buffer tank (2) is connected to the inlet of the pipeline centrifugal pump (3) through an outlet pipe. A pump front valve (7) is provided on the outlet pipe. The outlet of the pipeline centrifugal pump (3) is connected to the inlet of the storage tank (4) through a delivery pipe. The outlet of the storage tank (4) is connected to the workshop (5) through a supply pipe. An outlet valve (8) is provided on the supply pipe.

2. The liquid self-priming conveying device according to claim 1, characterized in that: The liquid inlet tube is equipped with a liquid inlet valve (9), and the exhaust pipe is equipped with a vacuum breaking valve (10).

3. The liquid self-priming conveying device according to claim 1, characterized in that: The device also includes a PLC control system, which is electrically connected to the pipeline centrifugal pump (3), the inlet valve (6), the pump front valve (7), the outlet valve (8), the priming valve (9), and the vacuum breaking valve (10).

4. A liquid self-priming conveying device according to claim 1, characterized in that: The buffer tank (2) is equipped with a pressure transmitter for detecting its internal pressure, and the pressure transmitter is electrically connected to the PLC control system.

5. A liquid self-priming conveying device according to claim 4, characterized in that: The storage tank (4) is equipped with a level switch for detecting the liquid level inside, and the level switch is electrically connected to the PLC control system.

6. A liquid self-priming conveying device according to claim 1, characterized in that: The buffer tank (2) and the storage tank (4) are made of polypropylene, polyvinylidene fluoride or reinforced fiberglass.

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