A submersible centrifugal pump with automatic venting

Abstract

This utility model discloses an automatic venting submersible centrifugal pump. Key technical features include a pump body and a pump cover. The pump cover has a pump chamber for mounting an impeller, and also has an inlet and an outlet connected to the pump chamber. The pump body has a receiving cavity for mounting a rotor, which is connected to the pump chamber. An vent hole is opened at the end of the receiving cavity away from the pump chamber, allowing the receiving cavity to communicate with the outside environment. This utility model, through its unique vent hole design, compresses air and discharges it along the vent hole when the pump body is immersed in liquid. This results in rapid and thorough venting, avoiding air binding, eliminating the need for additional priming equipment, and preventing failure. It solves the problems of increased costs and low venting efficiency associated with traditional solutions.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, and more specifically to a submersible centrifugal pump with automatic venting. Background Technology

[0002] Centrifugal pumps utilize the centrifugal force generated by the rotation of the impeller to draw liquid in from the inlet and accelerate it before discharging it. If air is present inside the pump and its density is very low, the centrifugal force generated by rotation is small. Consequently, the low pressure formed in the central area of ​​the impeller is insufficient to draw liquid from the storage tank into the pump. Even if the centrifugal pump is started, it cannot deliver liquid. This phenomenon is called air binding, indicating that the centrifugal pump lacks self-priming capability. This phenomenon is particularly severe when the pump is installed upside down (with the inlet facing downwards).

[0003] The current solution for centrifugal pumps is to open vent holes on the side wall of the pump cover and use centrifugal force to expel the gas inside the pump. However, this solution has the following problems: 1. The venting time is very long and the noise during venting is very loud; 2. If there is too much gas in the pump body, the centrifugal force generated after rotation is small and cannot expel the gas inside the pump, so it cannot transport liquid. Utility Model Content

[0004] To solve the above problems, this utility model provides the following technical solution:

[0005] An automatic venting submersible centrifugal pump includes a pump body and a pump cover. The pump cover has a pump chamber for mounting an impeller. The pump cover also has an inlet and an outlet communicating with the pump chamber. The pump body has a receiving cavity for mounting a rotor. The receiving cavity is connected to the pump chamber. An vent hole is opened at the end of the receiving cavity away from the pump chamber. The receiving cavity is connected to the outside through the vent hole.

[0006] The present invention is further configured such that: the pump cover is located below the pump body, the water inlet is opened at the bottom of the pump cover, the receiving cavity extends upward, and the vent is opened at the top of the receiving cavity.

[0007] The present invention is further configured such that: the pump cover and the pump body are integrally formed, or the pump cover and the pump body are detachably connected.

[0008] The present invention is further configured such that: a rotor is installed in the receiving cavity, the rotor extends into the pump cavity and is provided with an impeller, and the rotor is provided with a plurality of air-permeable channels.

[0009] The present invention is further configured such that: there is a gap between the top of the rotor and the top of the receiving cavity, and the venting channel passes through the rotor to connect the pump cavity with the gap.

[0010] The present invention is further configured such that: nine ventilation channels are provided, and the nine ventilation channels are arranged at equal intervals along the circumference of the rotor.

[0011] The present invention is further configured such that: a stator is disposed inside the pump body and located outside the receiving cavity, and a circuit board is disposed above the stator; the stator and the circuit board are encapsulated with epoxy resin.

[0012] The present invention is further configured such that: a rear cover is provided on the top of the pump body, and the rear cover is provided with a wire hole and a clearance hole.

[0013] The present invention is further configured such that: an exhaust pipe protrudes from the top of the receiving cavity at the exhaust hole, the exhaust pipe is connected to the exhaust hole, and the exhaust pipe passes through the clearance hole.

[0014] Compared with the prior art, the present invention has at least the following advantages:

[0015] 1. When liquid enters from the inlet, it can naturally compress the pump chamber and contain the air inside the chamber, allowing it to be discharged along the vent hole, thus avoiding air binding. Furthermore, through the design of the vent hole position, which is located at the end of the pump body, compared to the solution where the vent hole is located on the side wall of the pump cover, it can ensure that the air inside the chamber can be completely discharged, eliminating the need for additional priming equipment and preventing failure. This solves the problems of increased costs and low venting efficiency associated with traditional solutions.

[0016] 2. Because the gap between the rotor sidewall and the receiving cavity is small, an additional air passage is provided on the rotor to form an air flow channel from the pump chamber to the receiving cavity, which accelerates the delivery of air from the pump chamber area to the exhaust port and significantly shortens the exhaust time. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of this embodiment;

[0018] Figure 2 This is a perspective sectional view of this embodiment;

[0019] Figure 3 This is a schematic diagram showing one end of the impeller in the ventilation channel;

[0020] Figure 4 This is a schematic diagram showing one end of the rotor with the air vent.

[0021] Figure 5 This is a schematic diagram of the pump body and the rear cover;

[0022] Figure 6 This is a schematic diagram of a centrifugal pump being filled into water.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Pump body; 2. Pump cover; 3. Pump chamber; 4. Receiving cavity; 5. Inlet; 6. Outlet; 7. Vent hole; 8. Rotor; 9. Impeller; 10. Vent channel; 11. Stator; 12. Circuit board; 13. Rear cover; 14. Ring; 15. Rib; 16. Wire hole; 17. Clearance hole; 18. Power cord; 19. Exhaust pipe; 20. Water surface; 21. Air. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0026] A submersible centrifugal pump with automatic venting, such as Figure 1 and Figure 2 As shown, the pump includes a pump body 1 and a pump cover 2. The pump cover 2 has a pump chamber 3 for mounting the impeller 9, and also has an inlet 5 and an outlet 6 communicating with the pump chamber 3. The pump body 1 has a receiving cavity 4 for mounting the rotor 8, which is connected to the pump chamber 3. An exhaust hole 7 is opened at the end of the receiving cavity 4 away from the pump chamber 3, and the receiving cavity 4 is connected to the outside through the exhaust hole 7. When liquid enters from the inlet 5, it can naturally compress the air 21 in the pump chamber 3 and the receiving cavity 4 and discharge it along the exhaust hole 7. Furthermore, since the exhaust hole 7 is opened at the end of the receiving cavity 4 away from the pump chamber 3, the air 21 in the receiving cavity 4 and the pump chamber 3 is discharged more completely.

[0027] In this embodiment, the pump cover 2 is located below the pump body 1, the water inlet 5 is opened at the bottom of the pump cover 2, the receiving cavity 4 extends upward, and the vent 7 is opened at the top of the receiving cavity 4, so that the water inlet 5 and the water outlet 6 are located at opposite ends, allowing for the full discharge of gas. Both the water inlet 5 and the vent 7 are vertically opened, and the water outlet 6 is located on the side wall of the pump cover 2, arranged along the tangent direction of the side wall of the pump cover 2, so that the water can be smoothly discharged through the water outlet 6 after centrifugation.

[0028] The pump cover 2 and the pump body 1 are integrally formed, or the pump cover 2 and the pump body 1 are detachably connected; in this embodiment, the pump cover 2 and the pump body 1 are detachably connected, and the pump cover 2 and the pump body 1 are fastened by multiple bolts at the edge. This connection method facilitates the later inspection and maintenance of the internal components of the pump. Furthermore, a sealing ring is provided at the connection between the pump cover 2 and the pump body 1.

[0029] like Figures 2 to 4As shown, a rotor 8 is installed in the receiving cavity 4. The rotor 8 extends into the pump cavity 3 and is provided with an impeller 9. The impeller 9 is integrally formed with the rotor 8. There is a small gap between the peripheral side wall of the rotor 8 and the inner wall of the receiving cavity 4. The air 21 in the pump cavity 3 can flow along the gap to the exhaust port 7.

[0030] Furthermore, the rotor 8 is provided with several ventilation channels 10, which pass through the rotor 8 to connect the pump chamber 3 with the exhaust port 7. This allows the air 21 in the pump chamber 3 or the air 21 entering through the inlet 5 to flow to the exhaust port 7 through the ventilation channels 10, accelerating the delivery of air 21 from the impeller 9 area to the exhaust port 7 and significantly shortening the exhaust time.

[0031] Furthermore, there is a gap between the top of the rotor 8 and the top of the receiving cavity 4. This allows the air 21 to converge more smoothly to the exhaust port 7 for discharge, avoiding obstruction of the airflow 21 due to the contact between the rotor 8 and the top of the receiving cavity 4, thus optimizing the exhaust process.

[0032] In this embodiment, nine ventilation channels 10 are specifically provided. The nine ventilation channels 10 are arranged at equal intervals along the circumference of the rotor 8. In other embodiments, the number and arrangement of ventilation channels 10 on the rotor 8 can be adjusted according to actual needs, such as increasing or decreasing the number of ventilation channels 10 or changing their arrangement to adapt to centrifugal pumps of different specifications and operating conditions.

[0033] like Figure 2 and Figure 5 As shown, a stator 11 is installed inside the pump body 1 and around the receiving cavity 4. The stator 11 is sleeved on the periphery of the receiving cavity 4, and a circuit board 12 (PCBA) is installed above the stator 11. The stator 11 and the circuit board 12 are encapsulated with epoxy resin. This effectively isolates the liquid from the electrical components, prevents circuit failures caused by liquid seepage, improves the waterproof and moisture-proof performance and electrical safety of the centrifugal pump, and extends the product's service life.

[0034] Furthermore, a rear cover 13 is provided on the top of the pump body 1. A ring 14 protrudes from the bottom of the rear cover 13, and the ring 14 fits snugly against the inner wall of the pump body 1. Several ribs 15 protrude from the circumferential sidewall of the ring 14 to achieve an interference fit between the rear cover 13 and the pump body 1. The rear cover 13 is provided with a wire hole 16 and a clearance hole 17. The power lines 18 of the internal electrical components are led out through the wire hole 16, and the clearance hole 17 corresponds to the exhaust hole 7 to achieve exhaust. In other embodiments, for cost-saving considerations, the rear cover 13 may not be provided.

[0035] An exhaust pipe 19 protrudes from the top of the receiving cavity 4 at the exhaust port 7. The exhaust pipe 19 is connected to the exhaust port 7 and exits through the clearance hole 17. This extends the exhaust path to the outside of the rear cover 13, allowing air 21 to be discharged more directly from the pump, reducing exhaust resistance, further improving exhaust efficiency, and ensuring smooth exhaust.

[0036] The usage process of this embodiment is as follows:

[0037] like Figure 6 As shown, the centrifugal pump is placed in water (with the inlet 5 facing down). Water in the tank enters through the inlet 5. As the water level 20 rises, the air 21 in the pump chamber 3 and the receiving chamber 4 is discharged from the exhaust port 7 along the gaps in the rotor 8 or the ventilation channel 10. When the water level 20 overflows the centrifugal pump, the air 21 in the pump is also automatically vented. The structure of this application successfully solves the air binding problem of the centrifugal pump, does not require additional priming equipment, and does not have the problem of failure.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

[0039] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A submersible centrifugal pump with automatic venting, characterized in that: The pump includes a pump body and a pump cover. The pump cover has a pump chamber for mounting an impeller. The pump cover also has an inlet and an outlet that communicate with the pump chamber. The pump body has a receiving cavity for mounting a rotor. The receiving cavity is connected to the pump chamber. An exhaust hole is opened at the end of the receiving cavity away from the pump chamber. The receiving cavity communicates with the outside through the exhaust hole.

2. The submersible centrifugal pump with automatic venting according to claim 1, characterized in that: The pump cover is located below the pump body, the water inlet is located at the bottom of the pump cover, the receiving cavity extends upward, and the vent is located at the top of the receiving cavity.

3. The submersible centrifugal pump with automatic venting according to claim 2, characterized in that: The pump cover is integrally formed with the pump body, or the pump cover is detachably connected to the pump body.

4. The submersible centrifugal pump with automatic venting according to claim 3, characterized in that: A rotor is installed inside the receiving cavity, the rotor extends into the pump cavity and is provided with an impeller, and several air passages are opened on the rotor.

5. A submersible centrifugal pump with automatic venting according to claim 4, characterized in that: There is a gap between the top of the rotor and the top of the receiving cavity, and the venting channel passes through the rotor to connect the pump cavity with the gap.

6. A submersible centrifugal pump with automatic venting according to claim 5, characterized in that: The unit has nine ventilation channels, which are arranged at equal intervals along the circumference of the rotor.

7. A submersible centrifugal pump with automatic venting according to claim 4, characterized in that: A stator is disposed inside the pump body and located outside the receiving cavity, and a circuit board is disposed above the stator. The stator and the circuit board are encapsulated with epoxy resin.

8. A submersible centrifugal pump with automatic venting according to claim 7, characterized in that: The pump body is provided with a rear cover on the top, and the rear cover has a wire hole and a clearance hole.

9. A submersible centrifugal pump with automatic venting according to claim 8, characterized in that: An exhaust pipe protrudes from the top of the receiving cavity at the exhaust port, the exhaust pipe is connected to the exhaust port, and the exhaust pipe extends out through the clearance hole.

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