Exhaust structure for a water pump

Abstract

The utility model belongs to water pump technical field especially points to a kind of exhaust structure for water pump, including the pump body with pump cavity, impeller is equipped in the pump cavity, the pump body is equipped with the exhaust seat in the one side of pump cavity, exhaust seat is equipped with exhaust cavity in, the side wall of exhaust seat is equipped with the air inlet of the communication pump cavity and exhaust cavity, the top surface of air inlet is higher than the upper surface of impeller, exhaust seat top is equipped with the exhaust hole of the communication exhaust cavity and outside, exhaust cavity is equipped with ball, the gravity of ball is greater than the maximum buoyancy of ball, when the liquid pressure in pump cavity pushes ball and moves up to with exhaust cavity top and touches, ball blocks exhaust hole, when ball does not touch with exhaust cavity top, ball opens exhaust hole. The utility model impeller is completely worked on liquid medium, effectively improve the performance of water pump, reduce the risk of cavitation erosion cavitation.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, and specifically refers to an exhaust structure for water pumps. Background Technology

[0002] Chinese utility model patent (publication number CN208749597U, application date 2018.09.14, publication date 2019.04.16) discloses a submersible pump with a shaft anti-wear structure, including a housing, a stator disposed in the housing, a shaft disposed in the housing, and a rotor for driving the shaft to rotate. The housing has an oil cavity and an oil cylinder cover that seals the oil cavity. The shaft passes through the oil cavity. An impeller is fixedly disposed at the lower end of the shaft. A mechanical seal and a skeleton oil seal are disposed on the outer sleeve of the shaft. The mechanical seal is located in the oil cavity, and the skeleton oil seal is located below the mechanical seal. A shoulder is provided on the outer circumferential surface of the shaft between the mechanical seal and the skeleton oil seal. A bushing is fitted on the shaft. The upper end of the bushing abuts against the shoulder. The hub of the impeller abuts against the lower end of the bushing. The skeleton oil seal is disposed outside the bushing.

[0003] The shortcomings of the submersible pumps mentioned above are as follows: when the pump is placed in the air, the pump chamber is filled with air. When the pump is placed in the liquid medium, the liquid level in the pump chamber gradually rises. If the air inside is not expelled, it will be compressed to the top of the pump chamber by the liquid, which may result in the liquid medium not completely submerging the impeller. When the pump is running, because the pump chamber cannot be filled with the medium, the impeller cannot do work on the liquid completely, thereby reducing the performance of the pump (including flow rate and head) and increasing the risk of cavitation. Utility Model Content

[0004] The purpose of this invention is to provide an exhaust structure for a water pump, in which the impeller performs all the work on the liquid medium, effectively improving the performance of the water pump and reducing the risk of cavitation.

[0005] This utility model is implemented as follows: An exhaust structure for a water pump includes a pump body with a pump chamber, an impeller disposed within the pump chamber, an exhaust seat located on one side of the pump chamber on the pump body, an exhaust chamber disposed within the exhaust seat, an air inlet on the side wall of the exhaust seat connecting the pump chamber and the exhaust chamber, the top surface of the air inlet being higher than the upper surface of the impeller, an exhaust hole at the top of the exhaust seat connecting the exhaust chamber to the outside, and a sphere disposed within the exhaust chamber, the weight of the sphere being greater than its maximum buoyancy; when the liquid pressure within the pump chamber pushes the sphere upward to contact the top of the exhaust chamber, the sphere blocks the exhaust hole; when the sphere does not contact the top of the exhaust chamber, the sphere opens the exhaust hole.

[0006] In the above-mentioned exhaust structure for a water pump, the top surface of the exhaust chamber is a conical surface with a smaller diameter at the top and a larger diameter at the bottom. The exhaust hole is a circular hole and is coaxially arranged with the conical surface. The conical surface and the inner wall of the exhaust hole are transitioned by a circular arc surface. An annular boss is provided on the conical surface. The cross-section of the annular boss is circular arc. When both the circular arc surface and the annular boss are tangent to the sphere, the sphere blocks the exhaust hole.

[0007] In the above-mentioned exhaust structure for a water pump, the bottom of the exhaust chamber is provided with a protrusion for lifting the ball.

[0008] In the above-mentioned exhaust structure for a water pump, the protrusion is a cuboid with a height of 1mm-5mm and a length of 0.6-0.7 times the diameter of the sphere. The center of the protrusion is on the axis of the exhaust hole.

[0009] In the exhaust structure for a water pump described above, the bottom surface of the air inlet is lower than the lower surface of the impeller.

[0010] In the above-mentioned exhaust structure for a water pump, the impeller includes a cover plate and a plurality of blades disposed below the cover plate, the bottom surface of the air inlet is lower than the lower surface of the blades, and the top surface of the air inlet is higher than the upper surface of the cover plate.

[0011] In the above-mentioned exhaust structure for a water pump, an oil chamber is provided above the pump body, and the pump body and the oil chamber form the pump cavity. The highest point of the exhaust hole is higher than the lower surface of the oil chamber.

[0012] In the above-mentioned exhaust structure for a water pump, the pump body includes an upper pump body and a lower pump body that are fixedly connected by welding. The exhaust seat has a lower open structure and is an integral structure with the upper pump body. The exhaust chamber is formed between the exhaust seat and the lower pump body.

[0013] In the above-mentioned exhaust structure for a water pump, the upper pump body and the lower pump body are fixedly connected by friction welding.

[0014] In the above-mentioned exhaust structure for a water pump, the weight of the sphere is equal to 0.7 to 0.9 times the sum of the liquid pressure acting on the sphere and the buoyancy of the sphere.

[0015] In the aforementioned exhaust structure for a water pump, the sphere is made of glass, rubber, or plastic.

[0016] In the above-mentioned exhaust structure for a water pump, the exhaust chamber is a cylinder with its axis arranged vertically, and the diameter of the exhaust chamber is 1.1 to 1.2 times the diameter of the sphere.

[0017] In the above-mentioned exhaust structure for a water pump, the cross-section of the air inlet is rectangular, and the width of the air inlet cross-section is determined according to the pump exhaust speed, generally 0.05 to 0.1 times the base circle of the pump body.

[0018] The outstanding advantages of this utility model compared to the prior art are: This invention features an exhaust seat located on one side of the pump chamber on the pump body. The exhaust seat contains an exhaust chamber, and an air inlet connecting the pump chamber and the exhaust chamber is located on the side wall of the exhaust seat. The top surface of the air inlet is higher than the upper surface of the impeller. An exhaust hole connecting the exhaust chamber to the outside is located at the top of the exhaust seat. Air below the upper surface of the impeller is discharged through the air inlet, exhaust chamber, and exhaust hole, thus completely submerging the impeller in the liquid medium. The impeller performs all its work on the liquid medium, effectively improving the pump's performance and reducing the risk of cavitation. Simultaneously, a sphere is placed inside the exhaust chamber. Under the pressure of the liquid within the pump chamber, the sphere abuts against the top of the exhaust chamber and seals the exhaust hole, effectively preventing leakage from the exhaust hole. Attached Figure Description

[0019] Figure 1 This is a partial sectional view of the present invention.

[0020] Figure 2 yes Figure 1 Enlarged view of point A.

[0021] Figure 3 This is a cross-sectional view of the sphere used in this utility model to block the exhaust hole.

[0022] Figure 4 This is a perspective view of the pump body, exhaust seat, and ball of this utility model; Figure 5 This is a perspective view of the upper pump body of this utility model.

[0023] Figure 6 This is a perspective view of the lower pump body of this utility model.

[0024] Reference numerals in the attached drawings: 1. Pump chamber; 2. Pump body; 2a. Upper pump body; 2b. Lower pump body; 3. Impeller; 3a. Cover plate; 3b. Blade; 4. Exhaust seat; 5. Exhaust chamber; 6. Air inlet; 7. Exhaust hole; 8. Sphere; 9. Conical surface; 10. Arc surface; 11. Annular boss; 12. Protrusion. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —6: An exhaust structure for a water pump includes a pump body 2 having a pump chamber 1, an impeller 3 disposed within the pump chamber 1, an exhaust seat 4 located on one side of the pump chamber 1 on the pump body 2, an exhaust chamber 5 disposed within the exhaust seat 4, an air inlet 6 communicating between the pump chamber 1 and the exhaust chamber 5 on the side wall of the exhaust seat 4, the top surface of the air inlet 6 being higher than the upper surface of the impeller 3, an exhaust hole 7 communicating between the exhaust chamber 5 and the outside at the top of the exhaust seat 4, a sphere 8 disposed within the exhaust chamber 5, the weight of the sphere 8 being greater than the maximum buoyancy of the sphere 8, when the liquid pressure in the pump chamber 1 pushes the sphere 8 upward to contact the top of the exhaust chamber 5, the sphere 8 blocks the exhaust hole 7; when the sphere 8 does not contact the top of the exhaust chamber 5, the sphere 8 opens the exhaust hole 7.

[0026] The working principle of this utility model is as follows: Figures 1-6 As shown, when the pump body is placed in water, water enters the pump chamber 1, and the air in the pump chamber 1 is discharged through the air inlet 6, the exhaust chamber 5, and the exhaust hole 7. Before the water pump is started, the ball 8 in the exhaust seat 4 will not rise with the water level because the weight of the ball 8 is greater than its maximum buoyancy. The ball 8 does not touch the top of the exhaust chamber 5, and the ball 8 opens the exhaust hole 7. Since the top surface of the air inlet 6 is higher than the upper surface of the impeller 3, the air below the upper surface of the impeller 3 will be discharged through the air inlet 6, thus making the impeller 3 completely submerged in the liquid medium. When the impeller 3 does work on the liquid medium, it creates pressure in the liquid medium in the pump chamber 1. When the liquid pressure in the pump chamber 1 pushes the ball 8 to move upward and touch the top of the exhaust chamber 5, the ball 8 seals the exhaust hole 7, effectively preventing the liquid medium from leaking through the exhaust hole 7.

[0027] This invention features an exhaust seat 4 located on one side of the pump chamber 1 on the pump body 2. An exhaust chamber 5 is located within the exhaust seat 4. An air inlet 6 connecting the pump chamber 1 and the exhaust chamber 5 is located on the side wall of the exhaust seat 4. The top surface of the air inlet 6 is higher than the upper surface of the impeller 3. An exhaust hole 7 connecting the exhaust chamber 5 and the outside is located at the top of the exhaust seat 4. Air below the upper surface of the impeller 3 is discharged through the air inlet 6, the exhaust chamber 5, and the exhaust hole 7, thus completely submerging the impeller 3 in the liquid medium. The impeller performs all its work on the liquid medium, effectively improving the pump's performance and reducing the risk of cavitation. Simultaneously, a ball 8 is installed inside the exhaust chamber 5. Under the pressure of the liquid within the pump chamber 1, the ball 8 contacts the top of the exhaust chamber 5 and seals the exhaust hole 7, effectively preventing leakage from the exhaust hole 7.

[0028] To better seal the exhaust hole 7, the top surface of the exhaust chamber 5 is a conical surface 9 with a smaller diameter at the top and a larger diameter at the bottom. The exhaust hole 7 is a circular hole, and the exhaust hole 7 is coaxially arranged with the conical surface 9. The inner wall surface of the conical surface 9 and the exhaust hole 7 are connected by an arc surface 10. The conical surface 9 is provided with an annular boss 11, and the cross-section of the annular boss 11 is arc-shaped. When both the arc surface 10 and the annular boss 11 are tangent to the sphere 8, the sphere 8 seals the exhaust hole 7, forming two sealing contact points, effectively ensuring the effectiveness of the sphere 8 in sealing the exhaust hole 7.

[0029] To facilitate the upward movement of the ball 8 by the liquid pressure within the pump chamber 1, such as Figures 1-3 As shown in Figures 6 and 7, the bottom of the exhaust chamber 5 is provided with a protrusion 12 for lifting the ball 8.

[0030] Structure of protrusion 12: Protrusion 12 is a cuboid with a height of 1mm-5mm and a length of 0.6-0.7 times the diameter of sphere 8. The center of protrusion 12 is on the axis of exhaust hole 7. In this embodiment, the height of protrusion 12 is 1.5mm.

[0031] To facilitate air exhaust, such as Figures 1-3 As shown, the bottom surface of the air inlet 6 is lower than the lower surface of the impeller 3.

[0032] Structure of impeller 3: The impeller 3 includes a cover plate 3a and a plurality of blades 3b disposed below the cover plate 3a. The bottom surface of the air inlet 6 is lower than the lower surface of the blades 3b, and the top surface of the air inlet 6 is higher than the upper surface of the cover plate 3a.

[0033] Furthermore, an oil chamber is provided above the pump body 2, and the pump body 2 and the oil chamber form the pump cavity 1, with the highest point of the exhaust port 7 being higher than the lower surface of the oil chamber.

[0034] Pump body 2-ground structure: such as Figures 1-6 As shown, the pump body 2 includes an upper pump body 2a and a lower pump body 2b fixedly connected by welding. The exhaust seat 4 has a lower open structure and is an integral structure with the upper pump body 2a. The exhaust chamber 5 is formed between the exhaust seat 4 and the lower pump body 2b. The structure is simple, easy to process and install, and easy to install the ball 8, resulting in low production cost.

[0035] Furthermore, the upper pump body 2a and the lower pump body 2b are fixedly connected by friction welding, which has a good welding effect and makes it less likely for leakage to occur between the contact surfaces of the upper pump body 2a and the lower pump body 2b.

[0036] To effectively prevent leakage while ensuring efficient venting, the weight of the sphere 8 is equal to 0.7 to 0.9 times the sum of the liquid pressure acting on the sphere 8 and the buoyancy of the sphere 8. In this embodiment, the weight of the sphere 8 is equal to 0.8 times the sum of the pressure in the pump chamber 1 and the buoyancy of the sphere 8.

[0037] Preferably, the sphere 8 is made of glass, rubber, or plastic.

[0038] Preferably, the exhaust chamber 5 is a cylinder with its axis arranged vertically, and the diameter of the exhaust chamber 5 is 1.1 to 1.2 times the diameter of the sphere 8.

[0039] Furthermore, the cross-section of the air inlet 6 is rectangular, and the width of the air inlet 6 is determined according to the pump exhaust speed, generally 0.05 to 0.1 times the base circle of the pump body 2. In this embodiment, the width of the air inlet 6 is 0.05 times the base circle of the pump body 2.

[0040] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. An exhaust structure for a water pump, comprising a pump body (2) having a pump cavity (1) in which an impeller (3) is provided, characterized in that: The pump body (2) is provided with an exhaust seat (4) located on one side of the pump chamber (1). The exhaust seat (4) is provided with an exhaust chamber (5). The side wall of the exhaust seat (4) is provided with an air inlet (6) connecting the pump chamber (1) and the exhaust chamber (5). The top surface of the air inlet (6) is higher than the upper surface of the impeller (3). The top of the exhaust seat (4) is provided with an exhaust hole (7) connecting the exhaust chamber (5) and the outside. The exhaust chamber (5) is provided with a ball (8). The weight of the ball (8) is greater than the maximum buoyancy of the ball (8). When the liquid pressure in the pump chamber (1) pushes the ball (8) to move upward to contact the top of the exhaust chamber (5), the ball (8) blocks the exhaust hole (7). When the ball (8) does not contact the top of the exhaust chamber (5), the ball (8) opens the exhaust hole (7).

2. The exhaust structure for a water pump according to claim 1, characterized by: The top surface of the exhaust chamber (5) is a conical surface (9) with a smaller diameter at the top and a larger diameter at the bottom. The exhaust hole (7) is a circular hole and is coaxial with the conical surface (9). The inner wall of the conical surface (9) and the exhaust hole (7) are connected by an arc surface (10). The conical surface (9) is provided with an annular boss (11). The cross section of the annular boss (11) is arc-shaped. When both the arc surface (10) and the annular boss (11) are tangent to the sphere (8), the sphere (8) blocks the exhaust hole (7).

3. The exhaust structure for a water pump according to claim 1, characterized by: The bottom of the exhaust chamber (5) is provided with a protrusion (12) for lifting the ball (8).

4. The exhaust structure for a water pump according to claim 1, characterized by: The bottom surface of the air inlet (6) is lower than the bottom surface of the impeller (3).

5. The exhaust structure for a water pump according to claim 1, characterized by: An oil chamber is provided above the pump body (2), and the pump body (2) and the oil chamber form the pump cavity (1). The highest point of the exhaust hole (7) is higher than the lower surface of the oil chamber.

6. The exhaust structure for a water pump according to claim 1, characterized by: The pump body (2) includes an upper pump body (2a) and a lower pump body (2b) that are fixedly connected by welding. The exhaust seat (4) has a lower open structure and the exhaust seat (4) and the upper pump body (2a) are an integral structure. The exhaust chamber (5) is formed between the exhaust seat (4) and the lower pump body (2b).

7. The exhaust structure for a water pump according to claim 1, characterized by: The weight of the sphere (8) is equal to 0.7 to 0.9 times the sum of the liquid pressure acting on the sphere (8) and the buoyancy of the sphere (8).

8. The exhaust structure for a water pump according to claim 1, characterized by: The exhaust chamber (5) is a cylinder with its axis set vertically, and the diameter of the exhaust chamber (5) is 1.1 to 1.2 times the diameter of the sphere (8).

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