A vacuum-assisted self-priming pump

Abstract

This utility model relates to a vacuum-guided self-priming pump, a fire pump that meets the requirements of reliable physical self-priming, belonging to the technical field of self-priming pumps. Its structure is as follows: a vacuum priming device is connected to the pump's input pipe, the vacuum priming device being higher than the pump's horizontal axis plane; the vacuum priming device includes a priming box and a vacuum pump; an air extraction port is provided at the top of the priming box, and the vacuum pump's extraction pipe is connected to the air extraction port via a manual or electric ball valve; a liquid level sensor is provided inside the priming box, the plane on which the liquid level sensor senses the liquid level is the starting liquid level, and above the starting liquid level is an air-blocking slow-flow chamber. This vacuum-guided self-priming pump, using a vacuum priming device, can achieve one-time water priming and can be used without secondary priming, making it convenient and quick. It allows the pump body to be installed on the highest level of the fire water tank, still achieving the requirements of reliable physical self-priming using a pre-priming device.

Description

Technical Field

[0001] This utility model relates to a vacuum-induced self-priming pump, a fire pump that meets the requirements of self-priming, and belongs to the technical field of self-priming and self-priming pumps. Background Technology

[0002] Self-priming pumps are widely used in various fields due to their small size and ease of maintenance. However, existing self-priming pumps require the pump to be filled with water before operation, and they need to be refilled with water every time they are started, which is time-consuming and labor-intensive. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a strong self-priming pump with vacuum priming. This strong self-priming pump with vacuum priming adopts a vacuum priming device, which can realize that after one water priming, it can be used without secondary priming, which is convenient and quick.

[0004] To solve the above problems, the specific technical solution of this utility model is as follows: A strong self-priming pump with vacuum diversion, wherein a vacuum diversion device is connected to the pump's input pipe, and the vacuum diversion device is higher than the horizontal axis plane of the pump; the vacuum diversion device includes a diversion box and a vacuum pump; an air extraction port is provided at the top of the diversion box, and the air extraction pipe of the vacuum pump is connected to the air extraction port through a manual or electric ball valve; a liquid level sensor is provided inside the diversion box, the plane on which the liquid level sensor senses the liquid level is the starting liquid surface, and the space above the starting liquid surface is an air-blocking slow-flow chamber.

[0005] The input pipe is divided into two sections. One section extends upward into the diversion box and is flush with the starting liquid level. The other section is a gas-liquid mixing pipe. One end of the gas-liquid mixing pipe is inserted into the diversion box and is lower than the starting liquid level. The other end extends out of the diversion box and is connected to the pump inlet.

[0006] Above the starting liquid surface is an air-blocking slow-flow chamber, and a guide cap is provided inside the air-blocking slow-flow chamber. The bottom surface of the guide cap is flush with the starting liquid surface. One side of the guide cap is connected to the top of the input pipe, and the other side of the guide cap is provided with a water spray pipe. The water spray pipe has several radial through holes around its circumference. The diameter of the water spray pipe is smaller than the diameter of the gas-liquid mixing pipe, and the lower end of the water spray pipe is inserted into the top of the gas-liquid mixing pipe. An opening is left between the water spray pipe and the gas-liquid mixing pipe.

[0007] The gas-liquid mixing pipe is located at the lower end of the diversion box and has a water inlet.

[0008] The pump's outlet pipe bends upwards, and the bend is higher than the starting liquid level.

[0009] The pump is a horizontal pump or a vertical pump.

[0010] The vacuum priming pump of this application, employing the above-described structure, has the following advantages: 1. A vacuum pump is set up for evacuation. When the water level rises once, the liquid level will stop after the pump is stopped, which ensures that there is no need to fill water and evacuate air again when the pump is started next time. The operation is convenient and quick. 2. A vacuum pump and a manual ball valve are installed above the diversion box. When the vacuum pump draws the liquid level to the start / stop liquid level, it can be turned off, or even the vacuum pump can be removed to save equipment space. The vacuum pump can also be used for multiple purposes. 3. A guide cap, an opening, and a spray pipe are installed inside the slow-flow chamber. The water that rises from the input pipe is guided and diffused through the guide cap. The liquid mixes with the gas inside the guide cap and is sprayed out through the spray pipe. A pressure difference is formed inside and outside the guide cap. The gas outside the guide cap is continuously drawn in and driven from the opening. While the gas mixes with the water flow, it is continuously discharged from the input pipe. As a result, the liquid level inside the guide box is continuously increased to meet the pump's lifting requirements. Attached Figure Description

[0011] Figure 1 A schematic diagram of the structure of a self-priming pump for vacuum diversion, as shown in Example 1.

[0012] Figure 2 A schematic diagram of the structure of a self-priming pump for vacuum diversion, Example 2.

[0013] Figure 3 A schematic diagram of the structure of a self-priming pump for vacuum diversion, Example 3.

[0014] Figure 4 This is a schematic diagram of the water spray pipe structure. Detailed Implementation Example 1

[0015] like Figure 1 As shown, a strong self-priming pump with vacuum diversion has the following structure: a vacuum diversion device 2 is connected to the input pipe 3 of the pump 1, and the vacuum diversion device 2 is higher than the horizontal axis plane of the pump 1; the vacuum diversion device 2 includes a diversion box 21 and a vacuum pump 22; an air extraction port 23 is provided at the top of the diversion box 21, and the air extraction pipe of the vacuum pump 22 is connected to the air extraction port 23 through a manual or electric ball valve 24; a liquid level sensor 28 is provided inside the diversion box 21, and the plane on which the liquid level sensor 28 senses the liquid level is the starting liquid surface 27, and above the starting liquid surface 27 is an air-blocking slow flow chamber 25.

[0016] The diversion box 21 is equipped with a three-way valve at the starting liquid level 27, which connects the liquid level sensor 28 and the suction pipe of the vacuum pump 22. This not only reduces the size of the diversion box 21, but also improves the overall performance of the pump by installing a manual or electric ball valve 24 at the suction pipe, which is an explosion-proof solenoid valve. It can be used in explosion-proof fields.

[0017] During operation, the input pipe 3 of pump 1 is extended via a flange and inserted below the suction liquid level. Then, vacuum pump 22 is started, and the gas inside the evacuation box 21 and pump 1 is evacuated through the evacuation port 23, creating negative pressure. Liquid enters the evacuation box 21 through the input pipe 3, and the pump chamber below the sealed motor of pump 1 is also filled with water. When the liquid reaches the starting liquid level 27, the liquid level sensor 28 is activated, sending a signal to the external controller to shut down vacuum pump 22. Simultaneously, the manual ball valve 24 can be manually or electrically closed. The external controller starts pump 1, and since there is no gas inside pump 1, continuous operation is achieved. At the same time, the air-blocking slow-flow chamber 25 acts as an air-blocking structure, protecting the upper vacuum pump from the entry of gas, liquid, or other substances that could damage it. Example 2

[0018] like Figure 2 As shown, a strong self-priming pump for vacuum diversion has the following structure: a vacuum diversion device 2 is connected to the input pipe 3 of the pump 1; the vacuum diversion device 2 includes a diversion box 21 and a vacuum pump 22; an air extraction port 23 is provided at the top of the diversion box 21, and the air extraction pipe of the vacuum pump 22 is connected to the air extraction port 23 through a manual or electric ball valve 24; a liquid level sensor 28 is provided inside the diversion box 21, the plane on which the liquid level sensor 28 senses the liquid level is the starting liquid surface 27, and above the starting liquid surface 27 is an air-blocking slow-flow chamber 25.

[0019] The input pipe 3 is divided into two sections. One section of the input pipe 3 extends upward into the diversion box 21 and is flush with the starting liquid level 27. The other section is a gas-liquid mixed transport pipe 4. One end of the gas-liquid mixed transport pipe 4 is inserted into the diversion box 21 and is lower than the starting liquid level 27. The other end extends out of the diversion box 21 and is connected to the inlet of the pump 1.

[0020] During operation, the vacuum pump 22 draws gas from the suction box 21 through the suction port 23, creating a negative pressure. Liquid then enters the suction box 21 through the input pipe 3. The pump chamber below the sealed motor of pump 1 is also filled with water. When the liquid reaches the starting liquid level 27, the liquid level sensor 28 activates, sending a signal to the external controller to shut down the vacuum pump 22. Simultaneously, the manual ball valve 24 can be manually or electrically closed. When pump 1 first draws water from the suction box 21, lowering the liquid level and creating a negative pressure, the input pipe 3 raises the liquid level again to replenish water, thus ensuring continuous operation of pump 1. Example 3

[0021] like Figure 3 As shown, based on the structure of Embodiment 2, an air-blocking slow-flow cavity 25 is located above the starting liquid surface 27. A guide cap 31 is provided in the air-blocking slow-flow cavity 25. One side of the guide cap 31 is connected to the top of the input pipe 3, and the other side of the guide cap 31 is provided with an opening 32. The position of the opening 32 is flush with the starting liquid surface 27, and the position of the opening 32 corresponds to the position of the gas-liquid mixing pipe 4.

[0022] The lower end of the gas-liquid mixing pipe 4, located inside the diversion box 21, is equipped with a water inlet 33. For example... Figure 4 As shown, a water spray pipe 34 is provided at the opening 32 of the flow guide cap 31. The water spray pipe 34 has several radial through holes around its circumference. The diameter of the water spray pipe 34 is smaller than the diameter of the gas-liquid mixing pipe 4, and the lower end of the water spray pipe 34 is inserted into the top of the gas-liquid mixing pipe 4.

[0023] In this embodiment, the outlet pipe of the shaft seal shielded pump 1 is bent upwards, and the bend position is higher than the starting liquid level 27. This ensures that after the water level rises once, the liquid level will stop at the starting and stopping liquid level after the pump stops, thus ensuring that there is no need to refill water and pump air when starting the pump next time, making the operation convenient and quick.

[0024] During operation, the vacuum pump 22 draws gas from the inlet box 21 through the suction port 23, creating a negative pressure. Liquid enters the inlet box 21 through the input pipe 3. The pump chamber below the sealed motor of pump 1 is also filled with water. When the liquid reaches the starting liquid level 27, the liquid level sensor 28 is activated, sending a signal to the external controller to shut down the vacuum pump 22. Simultaneously, the manual ball valve 24 can be manually or electrically closed. When the starting pump 1 first draws water from the inlet box 21, the liquid level in the inlet box 21 decreases, creating a negative pressure. Liquid in the input pipe 3 is continuously drawn in, and the drawn-in liquid releases pressure and diffuses within the guide cap 31, mixing with the gas inside the guide cap. It then flows through the spray pipe 34 to the gas-liquid mixing pipe 4. When the liquid sprayed from the spray pipe 34 flows rapidly, a pressure difference is generated at the opening 32, mixing the surrounding gas into the high-speed flowing water through the radial through-holes of the spray pipe 34. The mixture is then output through pump 1, achieving a gas-liquid mixed output.

[0025] In the above embodiments one to three, pump 1 is a horizontal pump or a vertical pump to meet the requirements of various working conditions.

[0026] In Embodiments 1 and 3, when used in non-firefighting locations, the vacuum pump 22 can be removed after its operation. When restarting after stopping the pump, a starting water level remains inside, eliminating the need for the vacuum pump 22 to operate again, thus improving work efficiency. During firefighting operations, the vacuum pump 22 needs to be started before each start-up of pump 1 to expel accumulated gas in the suction pipe, ensuring pump 1 meets the self-priming requirements. The entire process of vacuum pump 22 startup and vacuum operation does not affect the normal operation of the fire pump.

Claims

1. A powerful self-priming pump for vacuum evacuation, characterized in that: A vacuum diversion device (2) is connected to the input pipe (3) of the pump (1). The vacuum diversion device (2) is higher than the horizontal axis plane of the pump (1). The vacuum diversion device (2) includes a diversion box (21) and a vacuum pump (22). An air extraction port (23) is provided at the top of the diversion box (21). The air extraction pipe of the vacuum pump (22) is connected to the air extraction port (23) through a manual or electric ball valve (24). A liquid level sensor (28) is provided in the diversion box (21). The plane on which the liquid level sensor (28) senses the liquid level is the starting liquid surface (27). Above the starting liquid surface (27) is the air blockage slow flow chamber (25).

2. The vacuum-induced self-priming pump according to claim 1, characterized in that: The input pipe (3) is divided into two sections. One section of the input pipe (3) extends upward into the diversion box (21) and is flush with the starting liquid level (27). The other section is a gas-liquid mixed transport pipe (4). One end of the gas-liquid mixed transport pipe (4) is inserted into the diversion box (21) and is lower than the starting liquid level (27). The other end extends out of the diversion box (21) and is connected to the inlet of the pump (1).

3. The vacuum-induced self-priming pump according to claim 2, characterized in that: Above the starting liquid surface (27) is an air-blocking slow-flow chamber (25), and a guide cap (31) is provided in the air-blocking slow-flow chamber (25). The bottom surface of the guide cap (31) is flush with the starting liquid surface (27). One side of the guide cap (31) is connected to the top of the input pipe (3), and the other side of the guide cap (31) is provided with a water spray pipe (34). The water spray pipe (34) has several radial through holes around its circumference. The diameter of the water spray pipe (34) is smaller than the diameter of the gas-liquid mixing pipe (4), and the lower end of the water spray pipe (34) is inserted into the top of the gas-liquid mixing pipe (4). An opening (32) is left between the water spray pipe (34) and the gas-liquid mixing pipe (4).

4. The vacuum-induced self-priming pump according to claim 3, characterized in that: The lower end of the gas-liquid mixing pipe (4) located inside the diversion box (21) is provided with a water inlet (33).

5. The vacuum-induced self-priming pump according to claim 3, characterized in that: The outlet pipe of pump (1) is bent upwards, and the bend position is higher than the starting liquid level (27).

6. The vacuum-induced self-priming pump according to any one of claims 1 to 5, characterized in that: The pump (1) is a horizontal pump or a vertical pump.

Images